Merge branch 'main' into overtrue/docs-1923-free-version-disposition

* test(kms): bound Vault failover progress wait

* ci(nightly): honor manual dispatch ref

* test(kms): preserve Vault worker failures

* test(kms): validate Vault circuit recovery

.github/workflows/nightly-gnu.yml

@@ -39,11 +39,10 @@ jobs:
     env:
       FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"
     steps:
-      - name: Checkout main branch
+      - name: Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
         with:
           persist-credentials: false
-          ref: main
 
       - name: Setup Rust environment
         uses: ./.github/actions/setup
@@ -89,11 +88,10 @@ jobs:
       # either casing.
       NO_PROXY: 127.0.0.1,localhost
     steps:
-      - name: Checkout main branch
+      - name: Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
         with:
           persist-credentials: false
-          ref: main
 
       - name: Setup Rust environment
         uses: ./.github/actions/setup
@@ -178,11 +176,10 @@ jobs:
       FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"
       NO_PROXY: 127.0.0.1,localhost
     steps:
-      - name: Checkout main branch
+      - name: Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
         with:
           persist-credentials: false
-          ref: main
 
       - name: Setup Rust environment
         uses: ./.github/actions/setup

CLAUDE.md

@@ -30,7 +30,8 @@ make build-docker BUILD_OS=ubuntu22.04
 - Crate membership: `Cargo.toml` `[workspace].members`
 - Architecture, layering, crate map: [ARCHITECTURE.md](ARCHITECTURE.md)
 - Migration guardrails & readiness contracts: [docs/architecture/](docs/architecture/README.md)
-- CI gates: `.github/workflows/ci.yml` (source of truth; never copy its steps into docs)
+- CI workflow steps: `.github/workflows/`; event, timeout, and required-status
+  matrix: [docs/testing/ci-gates.md](docs/testing/ci-gates.md)
 - Test-layer taxonomy, per-layer entry commands, serial/nextest rules, flake
   policy: [docs/testing/README.md](docs/testing/README.md)
 - Tier/ILM transition debugging (xl.meta inspection, versionId tracing):

CONTRIBUTING.md

@@ -70,6 +70,8 @@ make pre-pr
 
 > For the full test-layer taxonomy (unit / ecstore black-box / e2e / s3s-e2e / S3 compatibility / chaos / fuzz / bench), each layer's entry command, the naming conventions the migration gate depends on, and the serial/nextest rules, see [docs/testing/README.md](docs/testing/README.md).
 
+> For the event, timeout, required-status, and local reproduction matrix, see [docs/testing/ci-gates.md](docs/testing/ci-gates.md).
+
 ### 🔒 Automated Pre-commit Hooks
 #### What `make pre-commit` and `make pre-pr` actually run
 

Cargo.lock

@@ -1858,9 +1858,9 @@ dependencies = [
 
 [[package]]
 name = "cc"
-version = "1.4.3"
+version = "1.4.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "509591b7bcd67f4ef775afad7662703b4935daaa6ec0e5605cfb1090b32a2b6d"
+checksum = "0ad534f4357a5264cce5019c989cf66a4f0dc4e0d1b1d15f8aacec0ff7360273"
 dependencies = [
  "find-msvc-tools",
  "jobserver",
@@ -2522,12 +2522,6 @@ dependencies = [
  "subtle",
 ]
 
-[[package]]
-name = "cty"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b365fabc795046672053e29c954733ec3b05e4be654ab130fe8f1f94d7051f35"
-
 [[package]]
 name = "curve25519-dalek"
 version = "4.1.3"
@@ -5988,15 +5982,6 @@ version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6d2cec3eae94f9f509c767b45932f1ada8350c4bdb85af2fcab4a3c14807981"
 
-[[package]]
-name = "libmimalloc-sys"
-version = "0.1.49"
-source = "git+https://github.com/xonatius/mimalloc_rust.git?rev=6d4c41bb10c6d9da1d1b6f07b38c4cc051667f11#6d4c41bb10c6d9da1d1b6f07b38c4cc051667f11"
-dependencies = [
- "cc",
- "cty",
-]
-
 [[package]]
 name = "libredox"
 version = "0.1.20"
@@ -6397,14 +6382,6 @@ dependencies = [
  "synstructure 0.13.2",
 ]
 
-[[package]]
-name = "mimalloc"
-version = "0.1.52"
-source = "git+https://github.com/xonatius/mimalloc_rust.git?rev=6d4c41bb10c6d9da1d1b6f07b38c4cc051667f11#6d4c41bb10c6d9da1d1b6f07b38c4cc051667f11"
-dependencies = [
- "libmimalloc-sys",
-]
-
 [[package]]
 name = "mime"
 version = "0.3.17"
@@ -9162,13 +9139,11 @@ dependencies = [
  "insta",
  "jiff",
  "libc",
- "libmimalloc-sys",
  "libsystemd",
  "matchit 0.9.2",
  "md-5 0.11.0",
  "metrics",
  "metrics-util",
- "mimalloc",
  "mime_guess",
  "opentelemetry",
  "opentelemetry_sdk",
@@ -9204,6 +9179,8 @@ dependencies = [
  "rustfs-lock",
  "rustfs-log-analyzer",
  "rustfs-madmin",
+ "rustfs-mimalloc",
+ "rustfs-mimalloc-sys",
  "rustfs-notify",
  "rustfs-object-capacity",
  "rustfs-object-data-cache",
@@ -9875,6 +9852,24 @@ dependencies = [
  "tokio",
 ]
 
+[[package]]
+name = "rustfs-mimalloc"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a406f4aa07084301d485beec873af6dccc8e3f8762da244743df92038b1db1a6"
+dependencies = [
+ "rustfs-mimalloc-sys",
+]
+
+[[package]]
+name = "rustfs-mimalloc-sys"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3051b819175f58445d4c369a72f0ab88149f3885ba8bea2aff3be01f53fe7cd"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "rustfs-notify"
 version = "1.0.0-rc.3"

Cargo.toml

@@ -350,8 +350,8 @@ russh-sftp = "2.4.0"
 dav-server = "0.11.0"
 
 # Performance Analysis and Memory Profiling
-mimalloc = { version = "0.1.52", git = "https://github.com/xonatius/mimalloc_rust.git", rev = "6d4c41bb10c6d9da1d1b6f07b38c4cc051667f11" }
-libmimalloc-sys = { version = "0.1.49", git = "https://github.com/xonatius/mimalloc_rust.git", rev = "6d4c41bb10c6d9da1d1b6f07b38c4cc051667f11", features = ["extended"] }
+rustfs-mimalloc = { version = "0.5.0" }
+rustfs-mimalloc-sys = { version = "0.5.0" }
 hotpath = { version = "0.23.3", default-features = false }
 # Snapshot testing for output format regression detection
 insta = { version = "1.48" }

crates/ecstore/src/core/pools.rs

@@ -13,6 +13,8 @@
 // limitations under the License.
 
 use crate::bucket::replication::replication_state_from_filemeta;
+#[cfg(test)]
+use crate::bucket::utils::is_meta_bucketname;
 use crate::bucket::versioning_sys::BucketVersioningSys;
 use crate::bucket::{
     lifecycle::{
@@ -1347,6 +1349,53 @@ fn should_cleanup_decommission_source_entry(decommissioned: usize, total_version
     decommissioned.saturating_add(expired) == total_versions
 }
 
+const DECOMMISSION_FREE_VERSION_MIGRATED_REASON: &str = "tier_free_version_migrated";
+const DECOMMISSION_FREE_VERSION_CONSUMED_REASON: &str = "tier_free_version_already_consumed";
+const DECOMMISSION_FREE_VERSION_RETAINED_REASON: &str = "tier_free_version_migration_failed";
+const DECOMMISSION_FREE_VERSION_SWEEP_REASON: &str = "tier_free_version_unresolved_after_decommission";
+const DECOMMISSION_FREE_VERSION_DISPOSITION_REASON: &str = "tier_free_version_disposition_recorded";
+
+#[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
+struct DecommissionFreeVersionDisposition {
+    migrated: usize,
+    consumed: usize,
+    retained: usize,
+}
+
+impl DecommissionFreeVersionDisposition {
+    fn record_migrated(&mut self) {
+        self.migrated += 1;
+    }
+
+    fn record_consumed(&mut self) {
+        self.consumed += 1;
+    }
+
+    fn record_retained(&mut self) {
+        self.retained += 1;
+    }
+
+    fn total(self) -> usize {
+        self.migrated.saturating_add(self.consumed).saturating_add(self.retained)
+    }
+}
+
+enum DecommissionFreeVersionAttempt {
+    Migrated,
+    Consumed,
+    CapacityFailure(Error),
+    Retry(Error),
+}
+
+fn classify_decommission_free_version_attempt(result: Result<()>) -> DecommissionFreeVersionAttempt {
+    match result {
+        Ok(()) => DecommissionFreeVersionAttempt::Migrated,
+        Err(err) if is_decommission_copy_cleanup_safe_error(&err) => DecommissionFreeVersionAttempt::Consumed,
+        Err(err) if is_decommission_target_capacity_error(&err) => DecommissionFreeVersionAttempt::CapacityFailure(err),
+        Err(err) => DecommissionFreeVersionAttempt::Retry(err),
+    }
+}
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 #[allow(
     dead_code,
@@ -2615,8 +2664,12 @@ fn determine_decommission_final_state(items_failed: usize, was_cancelled: bool)
     }
 }
 
-fn decommission_remaining_version_count(total_versions: usize, expired: usize) -> usize {
-    total_versions.saturating_sub(expired)
+fn decommission_remaining_version_count(versions: &[rustfs_filemeta::FileInfo], expired: usize) -> usize {
+    versions
+        .iter()
+        .filter(|version| !version.tier_free_version())
+        .count()
+        .saturating_sub(expired)
 }
 
 fn should_skip_decommission_delete_marker(
@@ -2679,6 +2732,7 @@ fn decommission_remote_tiered_opts(
         user_defined: version.metadata.clone(),
         src_pool_idx,
         data_movement: true,
+        incl_free_versions: version.tier_free_version(),
         include_part_checksums: true,
         http_preconditions: Some(crate::data_movement::data_movement_target_precondition()),
         expected_bucket_incarnation_id,
@@ -3822,6 +3876,7 @@ impl ECStore {
 
         let mut decommissioned: usize = 0;
         let mut expired: usize = 0;
+        let mut free_version_disposition = DecommissionFreeVersionDisposition::default();
         let mut cleanup_preflight_allowed_missing = Vec::new();
 
         for version in fivs.versions.iter() {
@@ -3830,6 +3885,115 @@ impl ECStore {
             }
             decommission_cancel_signal_result(rx.is_cancelled())?;
 
+            if version.tier_free_version() {
+                let version_id = version.version_id.map(|v| v.to_string());
+                let mut migration_error = None;
+                let mut migrated = false;
+                let mut consumed = false;
+                let mut capacity_failure = false;
+                for _ in 0..3 {
+                    match classify_decommission_free_version_attempt(
+                        run_decommission_side_effect(&rx, &operation_gate, || async {
+                            self.decommission_tiered_object(
+                                bucket.as_str(),
+                                &version.name,
+                                version,
+                                &decommission_remote_tiered_opts(
+                                    version,
+                                    version_id.clone(),
+                                    idx,
+                                    expected_bucket_incarnation_id,
+                                ),
+                            )
+                            .await
+                        })
+                        .await,
+                    ) {
+                        DecommissionFreeVersionAttempt::Migrated => {
+                            migrated = true;
+                            migration_error = None;
+                            break;
+                        }
+                        DecommissionFreeVersionAttempt::Consumed => {
+                            consumed = true;
+                            migration_error = None;
+                            break;
+                        }
+                        DecommissionFreeVersionAttempt::CapacityFailure(err) => {
+                            capacity_failure = true;
+                            migration_error = Some(err);
+                            break;
+                        }
+                        DecommissionFreeVersionAttempt::Retry(err) => migration_error = Some(err),
+                    }
+                }
+
+                {
+                    let mut pool_meta = self.pool_meta.write().await;
+                    ensure_decommission_generation(&pool_meta, idx, generation)?;
+                    if let Err(err) = count_decommission_item(&mut pool_meta, idx, 0, !migrated && !consumed) {
+                        return Err(with_decommission_entry_context(
+                            "count_decommission_item",
+                            bucket.as_str(),
+                            entry.name.as_str(),
+                            err,
+                        ));
+                    }
+                }
+
+                if migrated || consumed {
+                    decommissioned += 1;
+                    cleanup_preflight_allowed_missing.push(data_movement::source_cleanup_version_identity(version));
+                }
+                if migrated {
+                    free_version_disposition.record_migrated();
+                } else if consumed {
+                    free_version_disposition.record_consumed();
+                } else {
+                    free_version_disposition.record_retained();
+                }
+
+                debug!(
+                    event = EVENT_DECOMMISSION_ENTRY,
+                    component = LOG_COMPONENT_ECSTORE,
+                    subsystem = LOG_SUBSYSTEM_POOLS,
+                    pool_index = idx,
+                    bucket = %bucket,
+                    object = %version.name,
+                    version_id = ?version_id,
+                    result = ?migration_error,
+                    reason = if migrated {
+                        DECOMMISSION_FREE_VERSION_MIGRATED_REASON
+                    } else if consumed {
+                        DECOMMISSION_FREE_VERSION_CONSUMED_REASON
+                    } else {
+                        DECOMMISSION_FREE_VERSION_RETAINED_REASON
+                    },
+                    state = if migrated {
+                        "free_version_migrated"
+                    } else if consumed {
+                        "free_version_consumed"
+                    } else {
+                        "free_version_retained"
+                    },
+                    "Decommission free-version disposition recorded"
+                );
+
+                if capacity_failure {
+                    return Err(with_decommission_entry_context(
+                        "decommission_tier_free_version",
+                        bucket.as_str(),
+                        version.name.as_str(),
+                        migration_error.expect("capacity failure must retain its error"),
+                    ));
+                }
+
+                if !migrated && !consumed {
+                    break;
+                }
+                continue;
+            }
+
             if run_decommission_side_effect(&rx, &operation_gate, || async {
                 should_skip_lifecycle_for_data_movement(
                     self.clone(),
@@ -3850,7 +4014,7 @@ impl ECStore {
                 continue;
             }
 
-            let remaining_versions = decommission_remaining_version_count(fivs.versions.len(), expired);
+            let remaining_versions = decommission_remaining_version_count(&fivs.versions, expired);
             if should_skip_decommission_delete_marker(version, remaining_versions, replication_config.is_some()) {
                 //
                 decommissioned += 1;
@@ -4129,6 +4293,24 @@ impl ECStore {
             }
         }
 
+        if free_version_disposition.total() > 0 {
+            debug!(
+                event = EVENT_DECOMMISSION_ENTRY,
+                component = LOG_COMPONENT_ECSTORE,
+                subsystem = LOG_SUBSYSTEM_POOLS,
+                pool_index = idx,
+                bucket = %bucket,
+                object = %entry.name,
+                free_versions_migrated = free_version_disposition.migrated,
+                free_versions_consumed = free_version_disposition.consumed,
+                free_versions_retained = free_version_disposition.retained,
+                free_versions_total = free_version_disposition.total(),
+                reason = DECOMMISSION_FREE_VERSION_DISPOSITION_REASON,
+                state = "free_version_disposition",
+                "Decommission free-version disposition summary"
+            );
+        }
+
         if should_cleanup_decommission_source_entry(decommissioned, fivs.versions.len(), expired) {
             if bucket_incarnation_fence.as_ref().is_some_and(|guard| guard.is_lock_lost()) {
                 return Err(Error::other("decommission bucket incarnation fence was lost before source cleanup"));
@@ -4298,6 +4480,39 @@ impl ECStore {
         .await
     }
 
+    #[cfg(test)]
+    pub(crate) async fn decommission_entry_for_test_with_bucket_incarnation(
+        self: &Arc<Self>,
+        idx: usize,
+        entry: MetaCacheEntry,
+        bucket: String,
+        set: Arc<SetDisks>,
+    ) -> Result<()> {
+        let expected_bucket_incarnation_id = if is_meta_bucketname(&bucket) {
+            None
+        } else {
+            Some(self.bucket_incarnation_id_from_disk(&bucket).await?)
+        };
+        self.decommission_entry(
+            CancellationToken::new(),
+            idx,
+            OffsetDateTime::now_utc(),
+            entry,
+            bucket,
+            set,
+            None,
+            None,
+            None,
+            expected_bucket_incarnation_id,
+        )
+        .await
+    }
+
+    #[cfg(test)]
+    pub(crate) async fn check_after_decommission_for_test(self: &Arc<Self>, idx: usize) -> Result<()> {
+        self.check_after_decommission(idx).await
+    }
+
     #[tracing::instrument(skip(self, rx))]
     async fn decommission_pool(
         self: &Arc<Self>,
@@ -5162,6 +5377,7 @@ impl ECStore {
                 let lifecycle_config_cb = lifecycle_config.clone();
                 let object_lock_config_cb = object_lock_config.clone();
                 let store = Arc::clone(self);
+                let set_cb = Arc::clone(set);
                 let callback_rx_cb = callback_rx.clone();
 
                 let callback: ListCallback = Arc::new(move |entry: MetaCacheEntry| {
@@ -5171,6 +5387,7 @@ impl ECStore {
                     let lifecycle_config = lifecycle_config_cb.clone();
                     let object_lock_config = object_lock_config_cb.clone();
                     let store = Arc::clone(&store);
+                    let set = Arc::clone(&set_cb);
                     let callback_rx = callback_rx_cb.clone();
                     Box::pin(async move {
                         if callback_rx.is_cancelled() {
@@ -5185,11 +5402,14 @@ impl ECStore {
                             return;
                         }
 
-                        let fivs = match load_decommission_entry_versions(
+                        let fivs = match load_decommission_entry_exact_versions(
+                            &set,
                             &entry,
                             &bucket_name,
                             "check_after_decommission.file_info_versions",
-                        ) {
+                        )
+                        .await
+                        {
                             Ok(fivs) => fivs,
                             Err(err) => {
                                 let mut first_err = entry_error.lock().await;
@@ -5202,7 +5422,23 @@ impl ECStore {
                         };
 
                         let mut remaining = 0;
-                        for version in &fivs.versions {
+                        for version in fivs.versions.iter().chain(fivs.free_versions.iter()) {
+                            if version.tier_free_version() {
+                                remaining += 1;
+                                debug!(
+                                    event = EVENT_DECOMMISSION_ENTRY,
+                                    component = LOG_COMPONENT_ECSTORE,
+                                    subsystem = LOG_SUBSYSTEM_POOLS,
+                                    pool_index = idx,
+                                    bucket = %bucket_name,
+                                    object = %entry.name,
+                                    version_id = ?version.version_id,
+                                    reason = DECOMMISSION_FREE_VERSION_SWEEP_REASON,
+                                    state = "free_version_retained",
+                                    "Decommission final sweep retained a free version"
+                                );
+                                continue;
+                            }
                             if version.deleted {
                                 continue;
                             }
@@ -5317,13 +5553,6 @@ mod tests {
         assert_eq!(determine_decommission_final_state(0, true), DecommissionFinalState::Failed);
     }
 
-    #[test]
-    fn decommission_remaining_version_count_excludes_only_expired_versions() {
-        assert_eq!(decommission_remaining_version_count(1, 0), 1);
-        assert_eq!(decommission_remaining_version_count(2, 1), 1);
-        assert_eq!(decommission_remaining_version_count(1, 1), 0);
-    }
-
     #[test]
     fn lifecycle_action_removes_data_movement_version_rejects_delete_marker_action() {
         assert!(!lifecycle_action_removes_data_movement_version(IlmAction::DeleteAction));
@@ -5380,6 +5609,21 @@ mod tests {
         )));
     }
 
+    #[test]
+    fn decommission_free_version_attempt_treats_missing_source_as_consumed() {
+        let attempt =
+            classify_decommission_free_version_attempt(Err(Error::ObjectNotFound("bucket".to_string(), "object".to_string())));
+
+        assert!(matches!(attempt, DecommissionFreeVersionAttempt::Consumed));
+    }
+
+    #[test]
+    fn decommission_free_version_attempt_preserves_capacity_failure() {
+        let attempt = classify_decommission_free_version_attempt(Err(Error::DiskFull));
+
+        assert!(matches!(attempt, DecommissionFreeVersionAttempt::CapacityFailure(Error::DiskFull)));
+    }
+
     #[test]
     fn decommission_delete_marker_copy_error_rejects_data_movement_overwrite() {
         let err = Error::DataMovementOverwriteErr("bucket".to_string(), "object".to_string(), "version".to_string());
@@ -5561,6 +5805,12 @@ mod tests {
         assert!(opts.include_part_checksums);
         assert!(opts.http_preconditions.is_some());
         assert_eq!(opts.expected_bucket_incarnation_id, Some(incarnation));
+        assert!(!opts.incl_free_versions);
+
+        let mut free_version = version;
+        free_version.set_tier_free_version();
+        let free_opts = decommission_remote_tiered_opts(&free_version, Some("free-version-id".to_string()), 9, Some(incarnation));
+        assert!(free_opts.incl_free_versions);
     }
 
     #[test]

crates/ecstore/src/data_movement/mod.rs

@@ -1950,6 +1950,19 @@ mod tests {
         assert!(source_cleanup_versions_match_with_allowed_missing(&expected, &current, &allowed_missing));
     }
 
+    #[test]
+    fn test_decommission_cleanup_preflight_accepts_migrated_free_version_consumed_from_source() {
+        let migrated = cleanup_test_file_info("object.txt", Uuid::from_u128(1), "migrated");
+        let mut free_version = cleanup_test_file_info("object.txt", Uuid::from_u128(2), "tier-cleanup");
+        free_version.deleted = true;
+        free_version.set_tier_free_version();
+        let expected = cleanup_test_versions(vec![migrated.clone(), free_version.clone()]);
+        let current = cleanup_test_versions(vec![migrated]);
+        let allowed_missing = vec![source_cleanup_version_identity(&free_version)];
+
+        assert!(source_cleanup_versions_match_with_allowed_missing(&expected, &current, &allowed_missing));
+    }
+
     #[test]
     fn test_decommission_cleanup_preflight_rejects_unexpected_missing_version() {
         let migrated = cleanup_test_file_info("object.txt", Uuid::from_u128(1), "migrated");

crates/ecstore/src/io_support/bitrot.rs

@@ -784,6 +784,24 @@ pub(crate) fn create_deferred_bitrot_reader_with_stripe_handle(
 ///
 /// # Returns
 /// A Result containing the BitrotWriterWrapper or an error
+/// Size hint handed to `DiskAPI::create_file` for a bitrot-wrapped shard.
+///
+/// A known length is grown by one checksum per shard so the on-disk file size
+/// matches what the bitrot writer emits. A negative length is the
+/// unknown-size sentinel (`HashReader::SIZE_PRESERVE_LAYER`, used by SSE and
+/// compression) and must be preserved: `RemoteDisk::create_file` forwards it
+/// in the `put_file_stream` query, and the receiver only treats `size > 0` as
+/// a fixed body length when locating the authenticated trailer. Clamping it
+/// to `0` would claim an empty body and misframe the stream. `0` stays `0`
+/// because a genuinely empty object still means an empty body.
+fn bitrot_create_file_size(length: i64, shard_size: usize, checksum_algo: &HashAlgorithm) -> i64 {
+    if length <= 0 {
+        return length;
+    }
+    let length = length as usize;
+    (length.div_ceil(shard_size) * checksum_algo.size() + length) as i64
+}
+
 pub async fn create_bitrot_writer(
     is_inline_buffer: bool,
     disk: Option<&DiskStore>,
@@ -796,12 +814,7 @@ pub async fn create_bitrot_writer(
     let writer = if is_inline_buffer {
         CustomWriter::new_inline_buffer()
     } else if let Some(disk) = disk {
-        let length = if length > 0 {
-            let length = length as usize;
-            (length.div_ceil(shard_size) * checksum_algo.size() + length) as i64
-        } else {
-            0
-        };
+        let length = bitrot_create_file_size(length, shard_size, &checksum_algo);
 
         let file = disk.create_file("", volume, path, length).await?;
         #[cfg(feature = "hotpath")]
@@ -820,6 +833,25 @@ mod tests {
     use rustfs_rio::ChunkReader;
     use std::collections::VecDeque;
 
+    #[test]
+    fn bitrot_create_file_size_grows_known_length_by_checksums() {
+        // 10 bytes over 4-byte shards = 3 shards, each followed by a 32-byte hash.
+        assert_eq!(bitrot_create_file_size(10, 4, &HashAlgorithm::HighwayHash256), 10 + 3 * 32);
+        assert_eq!(bitrot_create_file_size(10, 4, &HashAlgorithm::None), 10);
+    }
+
+    #[test]
+    fn bitrot_create_file_size_keeps_empty_and_unknown_distinct() {
+        assert_eq!(bitrot_create_file_size(0, 4, &HashAlgorithm::HighwayHash256), 0);
+        // SSE/compression streams advertise SIZE_PRESERVE_LAYER (-1); the remote
+        // put_file_stream receiver relies on a non-positive size to parse the auth
+        // trailer from the stream tail, so the sentinel must survive untouched.
+        assert_eq!(
+            bitrot_create_file_size(rustfs_rio::HashReader::SIZE_PRESERVE_LAYER, 4, &HashAlgorithm::HighwayHash256),
+            rustfs_rio::HashReader::SIZE_PRESERVE_LAYER
+        );
+    }
+
     struct TestChunkReader {
         chunks: VecDeque<Bytes>,
     }

crates/ecstore/src/set_disk/mod.rs

@@ -227,6 +227,70 @@ pub(super) fn restore_commit_operation_id_from_metadata(metadata: &HashMap<Strin
     restore_operation_id_from_metadata(metadata)
 }
 
+async fn inspect_decommission_tier_free_version_target(
+    disk: &DiskStore,
+    bucket: &str,
+    object: &str,
+    source: &FileInfo,
+) -> Result<bool> {
+    let raw = match disk.read_xl(bucket, object, false).await {
+        Ok(raw) => raw,
+        Err(DiskError::FileNotFound | DiskError::FileVersionNotFound | DiskError::VolumeNotFound) => return Ok(false),
+        Err(err) => return Err(err.into()),
+    };
+    let meta = FileMeta::load(&raw.buf)?;
+    let source_version_id = source.version_id.filter(|version_id| !version_id.is_nil());
+    let mut matching_count = 0;
+    let mut all_matching_versions_equivalent = true;
+    for existing in meta
+        .versions
+        .iter()
+        .filter(|version| version.header.version_id.filter(|version_id| !version_id.is_nil()) == source_version_id)
+    {
+        matching_count += 1;
+        let existing = existing.into_fileinfo(bucket, object, true)?;
+        existing.validate_for_metadata_read()?;
+        if !existing.tier_free_version() || !crate::store::tiered_data_movement_source_matches(source, &existing)? {
+            all_matching_versions_equivalent = false;
+        }
+    }
+    if matching_count == 0 {
+        return Ok(false);
+    }
+    if matching_count == 1 && all_matching_versions_equivalent {
+        return Ok(true);
+    }
+
+    Err(StorageError::DataMovementOverwriteErr(
+        bucket.to_owned(),
+        object.to_owned(),
+        source_version_id.map(|version_id| version_id.to_string()).unwrap_or_default(),
+    )
+    .into())
+}
+
+fn ensure_decommission_tier_free_version_commit_fence(bucket: &str, object: &str, opts: &ObjectOptions) -> Result<()> {
+    if opts
+        .namespace_lock_fence
+        .as_ref()
+        .is_some_and(NamespaceLockFence::is_lock_lost)
+        || opts
+            .bucket_lifecycle_lock_fence
+            .as_ref()
+            .is_some_and(NamespaceLockFence::is_lock_lost)
+    {
+        return Err(StorageError::NamespaceLockQuorumUnavailable {
+            mode: "decommission_tier_free_version_commit",
+            bucket: bucket.to_string(),
+            object: object.to_string(),
+            required: 1,
+            achieved: 0,
+        });
+    }
+
+    Ok(())
+}
+
 impl SetDisks {
     pub(super) async fn require_current_restore_operation_id(
         &self,
@@ -4665,6 +4729,98 @@ fn resolve_delete_version_state(opts: &ObjectOptions, goi: &ObjectInfo, version_
 }
 
 impl SetDisks {
+    /// Publish an internal tier free-version record without changing its
+    /// delete-marker shape or remote-tier identity. The caller holds the
+    /// source and target object locks; a write quorum is required before the
+    /// source cleanup may remove the original record.
+    #[tracing::instrument(skip(self, fi, opts))]
+    pub(crate) async fn decommission_tier_free_version(
+        &self,
+        bucket: &str,
+        object: &str,
+        fi: &FileInfo,
+        opts: &ObjectOptions,
+    ) -> Result<()> {
+        if !fi.deleted || !fi.tier_free_version() {
+            return Err(Error::other("decommission tier free-version write requires a free version record"));
+        }
+        ensure_decommission_tier_free_version_commit_fence(bucket, object, opts)?;
+
+        self.validate_decommission_tier_free_version_target(bucket, object, fi)
+            .await?;
+        ensure_decommission_tier_free_version_commit_fence(bucket, object, opts)?;
+
+        let disks = self.disks.read().await.clone();
+        let write_quorum = self.default_write_quorum();
+        let futures = disks.into_iter().map(|disk| {
+            let file_info = fi.clone();
+            async move {
+                if let Some(disk) = disk {
+                    disk.write_metadata("", bucket, object, file_info).await
+                } else {
+                    Err(DiskError::DiskNotFound)
+                }
+            }
+        });
+
+        let mut errs = Vec::new();
+        for result in join_all(futures).await {
+            match result {
+                Ok(_) => errs.push(None),
+                Err(err) => errs.push(Some(err)),
+            }
+        }
+
+        ensure_decommission_tier_free_version_commit_fence(bucket, object, opts)?;
+
+        resolve_tiered_decommission_write_quorum_result(&errs, write_quorum, bucket, object)
+    }
+
+    pub(crate) async fn validate_decommission_tier_free_version_target(
+        &self,
+        bucket: &str,
+        object: &str,
+        fi: &FileInfo,
+    ) -> Result<()> {
+        // The caller holds the source and target object locks. Inspect every
+        // target disk before an idempotent return or metadata fan-out so a
+        // sub-quorum conflict cannot be hidden by a successful quorum.
+        let disks = self.disks.read().await.clone();
+        let preflight = disks
+            .iter()
+            .flatten()
+            .map(|disk| inspect_decommission_tier_free_version_target(disk, bucket, object, fi));
+        for result in join_all(preflight).await {
+            result?;
+        }
+        Ok(())
+    }
+
+    pub(crate) async fn has_decommission_tier_free_version_write_quorum(
+        &self,
+        bucket: &str,
+        object: &str,
+        fi: &FileInfo,
+        opts: &ObjectOptions,
+    ) -> Result<bool> {
+        ensure_decommission_tier_free_version_commit_fence(bucket, object, opts)?;
+        let disks = self.disks.read().await.clone();
+        let preflight = disks.iter().map(|disk| async {
+            match disk {
+                Some(disk) => inspect_decommission_tier_free_version_target(disk, bucket, object, fi).await,
+                None => Ok(false),
+            }
+        });
+        let mut equivalent = 0;
+        for result in join_all(preflight).await {
+            if result? {
+                equivalent += 1;
+            }
+        }
+        ensure_decommission_tier_free_version_commit_fence(bucket, object, opts)?;
+        Ok(equivalent >= self.default_write_quorum())
+    }
+
     #[tracing::instrument(skip(self, fi, opts))]
     pub(crate) async fn decommission_tiered_object(
         &self,
@@ -9887,6 +10043,147 @@ mod tests {
         assert_ne!(updated.erasure.distribution, original.erasure.distribution);
     }
 
+    #[tokio::test]
+    async fn decommission_tier_free_version_preserves_remote_identity() {
+        let set_disks = make_local_bucket_test_set_disks().await;
+        let bucket = "free-version-decommission";
+        let object = "object.txt";
+        set_disks
+            .make_bucket(bucket, &MakeBucketOptions::default())
+            .await
+            .expect("target bucket should exist before free-version migration");
+        let version_id = Uuid::new_v4();
+        let mut free_version = FileInfo {
+            name: object.to_string(),
+            volume: bucket.to_string(),
+            version_id: Some(version_id),
+            mod_time: Some(time::OffsetDateTime::now_utc()),
+            deleted: true,
+            transition_tier: "WARM-TIER".to_string(),
+            transitioned_objname: "remote/object".to_string(),
+            ..Default::default()
+        };
+        free_version.set_tier_free_version();
+        // Decoded free versions always carry the on-disk free-version
+        // suffix alongside the in-memory tier marker; mirror that here so
+        // the record satisfies delete-marker metadata validation.
+        rustfs_utils::http::metadata_compat::insert_str(
+            &mut free_version.metadata,
+            rustfs_utils::http::metadata_compat::SUFFIX_FREE_VERSION,
+            String::new(),
+        );
+
+        set_disks
+            .decommission_tier_free_version(bucket, object, &free_version, &ObjectOptions::default())
+            .await
+            .expect("free-version metadata should reach the target quorum");
+        set_disks
+            .decommission_tier_free_version(bucket, object, &free_version, &ObjectOptions::default())
+            .await
+            .expect("replaying the same free-version metadata should be idempotent");
+
+        let versions = set_disks
+            .load_file_info_versions_exact(bucket, object)
+            .await
+            .expect("migrated free-version metadata should decode")
+            .expect("migrated free-version metadata should exist");
+        let migrated = versions
+            .versions
+            .iter()
+            .find(|version| version.version_id == Some(version_id))
+            .expect("free version should be present on the target");
+
+        assert_eq!(
+            versions
+                .versions
+                .iter()
+                .filter(|version| version.version_id == Some(version_id))
+                .count(),
+            1
+        );
+        assert!(migrated.tier_free_version());
+        assert_eq!(migrated.transition_tier, "WARM-TIER");
+        assert_eq!(migrated.transitioned_objname, "remote/object");
+    }
+
+    #[tokio::test]
+    async fn decommission_tier_free_version_resume_requires_write_quorum() {
+        let set_disks = make_local_bucket_test_set_disks_with_drive_count(4).await;
+        let bucket = "free-version-decommission-resume";
+        let object = "object.txt";
+        set_disks
+            .make_bucket(bucket, &MakeBucketOptions::default())
+            .await
+            .expect("target bucket should exist before free-version migration");
+        let mut free_version = FileInfo {
+            name: object.to_string(),
+            volume: bucket.to_string(),
+            version_id: Some(Uuid::new_v4()),
+            mod_time: Some(time::OffsetDateTime::now_utc()),
+            deleted: true,
+            transition_tier: "WARM-TIER".to_string(),
+            transitioned_objname: "remote/object".to_string(),
+            ..Default::default()
+        };
+        free_version.set_tier_free_version();
+        // Decoded free versions always carry the on-disk free-version
+        // suffix alongside the in-memory tier marker; mirror that here so
+        // the record satisfies delete-marker metadata validation.
+        rustfs_utils::http::metadata_compat::insert_str(
+            &mut free_version.metadata,
+            rustfs_utils::http::metadata_compat::SUFFIX_FREE_VERSION,
+            String::new(),
+        );
+        let opts = ObjectOptions::default();
+
+        let disks = set_disks.get_disks_internal().await;
+        for disk in disks.iter().take(2).flatten() {
+            disk.write_metadata("", bucket, object, free_version.clone())
+                .await
+                .expect("partial first attempt should leave equivalent metadata");
+        }
+        assert!(
+            !set_disks
+                .has_decommission_tier_free_version_write_quorum(bucket, object, &free_version, &opts)
+                .await
+                .expect("partial target metadata should remain valid"),
+            "write-quorum-minus-one must not be accepted as an idempotent migration"
+        );
+
+        disks[2]
+            .as_ref()
+            .expect("third target disk should be online")
+            .write_metadata("", bucket, object, free_version.clone())
+            .await
+            .expect("third equivalent target write should complete quorum");
+        assert!(
+            set_disks
+                .has_decommission_tier_free_version_write_quorum(bucket, object, &free_version, &opts)
+                .await
+                .expect("write-quorum target metadata should remain valid")
+        );
+    }
+
+    #[test]
+    fn decommission_tier_free_version_commit_rejects_lost_fence() {
+        let opts = ObjectOptions {
+            namespace_lock_fence: Some(NamespaceLockFence::lost_for_test()),
+            ..Default::default()
+        };
+
+        let err = ensure_decommission_tier_free_version_commit_fence("bucket", "object", &opts)
+            .expect_err("lost target lock must fail the free-version commit");
+        assert!(matches!(
+            err,
+            Error::NamespaceLockQuorumUnavailable {
+                mode: "decommission_tier_free_version_commit",
+                required: 1,
+                achieved: 0,
+                ..
+            }
+        ));
+    }
+
     #[test]
     fn test_resolve_tiered_decommission_write_quorum_result_allows_successful_quorum() {
         let errs = vec![None, None, Some(DiskError::DiskNotFound), None];

crates/ecstore/src/set_disk/ops/object.rs

@@ -2124,26 +2124,13 @@ impl SetDisks {
 
             let put_object_size = known_put_object_storage_size(data.size());
             let shard_file_size_raw = erasure.shard_file_size(put_object_size);
-            let is_inline_buffer =
-                storage_class_config.should_inline(shard_file_size_raw, erasure.data_shards, opts.versioned);
+            let is_inline_buffer = storage_class_config.should_inline(shard_file_size_raw, erasure.data_shards, opts.versioned);
 
             let collect_stage_timing = rustfs_io_metrics::put_stage_metrics_enabled() || issue3031_diag_enabled();
             let shard_file_size = shard_file_size_raw;
             let shard_size = erasure.shard_size();
             let write_path = classify_put_write_path(is_inline_buffer, put_object_size, fi.erasure.block_size);
             let direct_inline_commit = matches!(write_path, SmallWritePath::Inline);
-            {
-                use std::io::Write;
-                let msg = format!(
-                    "INLINE_DEBUG: bucket={} obj={} size={} shard_fs={} ds={} bs={} inline={} direct={} path={} iblock={} ver={}\n",
-                    bucket, object, put_object_size, shard_file_size_raw, erasure.data_shards, fi.erasure.block_size,
-                    is_inline_buffer, direct_inline_commit, write_path.metric_label(), storage_class_config.inline_block(), opts.versioned
-                );
-                if let Ok(mut f) = std::fs::OpenOptions::new().create(true).append(true).open("/tmp/rustfs_inline_debug.log") {
-                    let _ = f.write_all(msg.as_bytes());
-                }
-                let _ = std::io::stderr().write_all(msg.as_bytes());
-            }
             rustfs_io_metrics::record_put_object_path(write_path.metric_label());
             let writer_setup_stage_start = collect_stage_timing.then(Instant::now);
             let (mut writers, errors) = if direct_inline_commit {

crates/ecstore/src/store/init.rs

@@ -553,6 +553,8 @@ mod tests {
         should_retry_format_load, should_retry_local_decommission_resume, wait_for_local_decommission_resume_delay,
     };
     #[cfg(feature = "test-util")]
+    use crate::disk::DiskAPI;
+    #[cfg(feature = "test-util")]
     use crate::{
         bucket::lifecycle::{
             lifecycle::{TRANSITION_PENDING, TransitionOptions},
@@ -1307,6 +1309,77 @@ mod tests {
         });
     }
 
+    #[cfg(feature = "test-util")]
+    async fn seed_transitioned_free_version(
+        ctx: &Arc<crate::runtime::instance::InstanceContext>,
+        store: &Arc<crate::store::ECStore>,
+        bucket: &str,
+        object: &str,
+    ) -> (uuid::Uuid, uuid::Uuid) {
+        let tier_name = format!("DECOMFREE{}", uuid::Uuid::new_v4().simple());
+        register_mock_tier(&ctx.tier_config_mgr(), &tier_name).await;
+
+        let mut reader = PutObjReader::from_vec(b"transitioned source bytes".to_vec());
+        let source = store.pools[0]
+            .put_object(
+                bucket,
+                object,
+                &mut reader,
+                &ObjectOptions {
+                    versioned: true,
+                    ..Default::default()
+                },
+            )
+            .await
+            .expect("write transitioned decommission source");
+        let source_version = source.version_id.expect("transitioned source must be versioned");
+        store.pools[0]
+            .transition_object(
+                bucket,
+                object,
+                &ObjectOptions {
+                    versioned: true,
+                    version_id: Some(source_version.to_string()),
+                    transition: TransitionOptions {
+                        status: TRANSITION_PENDING.to_string(),
+                        tier: tier_name,
+                        etag: source.etag.clone().expect("transitioned source must have an ETag"),
+                        ..Default::default()
+                    },
+                    mod_time: source.mod_time,
+                    ..Default::default()
+                },
+            )
+            .await
+            .expect("transition source before decommission");
+        store.pools[0]
+            .delete_object(
+                bucket,
+                object,
+                ObjectOptions {
+                    versioned: true,
+                    version_id: Some(source_version.to_string()),
+                    ..Default::default()
+                },
+            )
+            .await
+            .expect("delete transitioned source version");
+
+        let versions = store.pools[0]
+            .get_disks_by_key(object)
+            .load_file_info_versions_exact(bucket, object)
+            .await
+            .expect("source versions should decode after transition delete")
+            .expect("source free version should remain after transition delete");
+        let free_version = versions
+            .versions
+            .iter()
+            .find(|version| version.tier_free_version())
+            .and_then(|version| version.version_id)
+            .expect("transition delete should create a free version");
+        (source_version, free_version)
+    }
+
     async fn write_decommission_test_multipart_source(
         store: &Arc<crate::store::ECStore>,
         pool_idx: usize,
@@ -3846,6 +3919,383 @@ mod tests {
         shutdown.cancel();
     }
 
+    #[cfg(feature = "test-util")]
+    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+    #[serial_test::serial(storage_class_env)]
+    async fn decommission_entry_skips_cleanup_only_marker_when_free_version_is_present() {
+        let temp_dir = tempfile::tempdir().expect("create free-version decommission store dir");
+        let (ctx, store, shutdown) =
+            without_storage_class_env(build_isolated_test_store(temp_dir.path(), "decommission-free-marker", &[4, 4])).await;
+        crate::bucket::metadata_sys::init_bucket_metadata_sys(store.clone(), Vec::new()).await;
+        let bucket = format!("decom-free-marker-{}", uuid::Uuid::new_v4());
+        let object = "free-marker-object";
+        store
+            .make_bucket(&bucket, &MakeBucketOptions::default())
+            .await
+            .expect("create free-version decommission bucket");
+        let (_, free_version) = seed_transitioned_free_version(&ctx, &store, &bucket, object).await;
+        let source_free = store.pools[0]
+            .get_disks_by_key(object)
+            .load_file_info_versions_exact(&bucket, object)
+            .await
+            .expect("source free-version metadata should decode")
+            .and_then(|versions| {
+                versions
+                    .versions
+                    .into_iter()
+                    .find(|version| version.version_id == Some(free_version) && version.tier_free_version())
+            })
+            .expect("source free-version identity should be present before decommission");
+        let mut target_reader = PutObjReader::from_vec(b"target ordinary bytes".to_vec());
+        let target_w = store.pools[1]
+            .put_object(
+                &bucket,
+                object,
+                &mut target_reader,
+                &ObjectOptions {
+                    versioned: true,
+                    ..Default::default()
+                },
+            )
+            .await
+            .expect("write unrelated target version");
+        let target_w_version = target_w.version_id.expect("target version should have an id");
+        let marker = store.pools[0]
+            .delete_object(
+                &bucket,
+                object,
+                ObjectOptions {
+                    versioned: true,
+                    ..Default::default()
+                },
+            )
+            .await
+            .expect("write cleanup-only delete marker");
+        assert!(marker.delete_marker);
+
+        mark_test_pool_decommissioning(&store, 0).await;
+        let source_set = store.pools[0].get_disks_by_key(object);
+        store
+            .decommission_entry_for_test_with_bucket_incarnation(
+                0,
+                MetaCacheEntry {
+                    name: object.to_string(),
+                    ..Default::default()
+                },
+                bucket.clone(),
+                source_set.clone(),
+            )
+            .await
+            .expect("real decommission entry should migrate the free version");
+
+        let target_versions = store.pools[1]
+            .get_disks_by_key(object)
+            .load_file_info_versions_exact(&bucket, object)
+            .await
+            .expect("target versions should decode")
+            .expect("target free version should be present");
+        assert!(
+            target_versions
+                .versions
+                .iter()
+                .any(|version| { version.version_id == Some(free_version) && version.tier_free_version() })
+        );
+        let migrated_free = target_versions
+            .versions
+            .iter()
+            .find(|version| version.version_id == Some(free_version) && version.tier_free_version())
+            .expect("migrated free-version identity should remain readable from target disks");
+        assert!(
+            crate::store::tiered_data_movement_source_matches(&source_free, migrated_free)
+                .expect("migrated free-version identity should decode")
+        );
+        let retained_w = target_versions
+            .versions
+            .iter()
+            .find(|version| version.version_id == Some(target_w_version))
+            .expect("unrelated target version should remain");
+        assert!(!retained_w.deleted && !retained_w.tier_free_version());
+        assert_eq!(retained_w.size, target_w.size);
+        assert_eq!(retained_w.get_etag(), target_w.etag);
+        assert!(
+            target_versions
+                .versions
+                .iter()
+                .all(|version| { version.tier_free_version() || !version.deleted })
+        );
+        assert!(
+            source_set
+                .load_file_info_versions_exact(&bucket, object)
+                .await
+                .expect("source versions should be readable after cleanup")
+                .is_none(),
+            "successful free-version migration should permit source cleanup"
+        );
+        let (heal_versions, _, _) = store
+            .heal_walk_versions_page(1, 0, &bucket, "", None, 2, 16, true)
+            .await
+            .expect("heal walk should decode the migrated free version");
+        let free_version_string = free_version.to_string();
+        let healed_free = heal_versions
+            .iter()
+            .find(|version| version.version_id.as_deref() == Some(free_version_string.as_str()))
+            .expect("heal walk should surface the migrated free version");
+        let healed_info = healed_free
+            .lifecycle_object_info
+            .as_ref()
+            .expect("heal walk should retain lifecycle identity for the migrated free version");
+        assert!(healed_info.transitioned_object.free_version);
+        assert_eq!(healed_info.transitioned_object.tier, source_free.transition_tier);
+        assert_eq!(healed_info.transitioned_object.name, source_free.transitioned_objname);
+        shutdown.cancel();
+    }
+
+    #[cfg(feature = "test-util")]
+    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+    #[serial_test::serial(storage_class_env)]
+    async fn decommission_entry_allows_free_version_consumed_before_source_lock() {
+        let temp_dir = tempfile::tempdir().expect("create consumed free-version store dir");
+        let (ctx, store, shutdown) =
+            without_storage_class_env(build_isolated_test_store(temp_dir.path(), "decommission-free-consumed", &[4, 4])).await;
+        crate::bucket::metadata_sys::init_bucket_metadata_sys(store.clone(), Vec::new()).await;
+        let bucket = format!("decom-free-consumed-{}", uuid::Uuid::new_v4());
+        let object = "free-consumed-object";
+        store
+            .make_bucket(&bucket, &MakeBucketOptions::default())
+            .await
+            .expect("create consumed free-version bucket");
+        let (_, free_version) = seed_transitioned_free_version(&ctx, &store, &bucket, object).await;
+
+        mark_test_pool_decommissioning(&store, 0).await;
+        let source_set = store.pools[0].get_disks_by_key(object);
+        let barrier = crate::store::object::DecommissionFreeVersionSourceRaceBarrier::install(&bucket, object);
+        let decommission = tokio::spawn({
+            let store = store.clone();
+            let bucket = bucket.clone();
+            let source_set = source_set.clone();
+            async move {
+                store
+                    .decommission_entry_for_test_with_bucket_incarnation(
+                        0,
+                        MetaCacheEntry {
+                            name: object.to_string(),
+                            ..Default::default()
+                        },
+                        bucket,
+                        source_set,
+                    )
+                    .await
+            }
+        });
+
+        barrier.wait_until_paused().await;
+        store.pools[0]
+            .delete_object(
+                &bucket,
+                object,
+                ObjectOptions {
+                    versioned: true,
+                    version_id: Some(free_version.to_string()),
+                    incl_free_versions: true,
+                    ..Default::default()
+                },
+            )
+            .await
+            .expect("lifecycle should consume the source free version before decommission locks it");
+        assert!(
+            source_set
+                .load_file_info_versions_exact(&bucket, object)
+                .await
+                .expect("consumed source metadata should remain readable")
+                .is_none(),
+            "the lifecycle delete should remove the source free version"
+        );
+
+        barrier.release();
+        decommission
+            .await
+            .expect("decommission task should join")
+            .expect("a concurrently consumed free version should not fail source cleanup");
+        assert!(
+            store.pools[1]
+                .get_disks_by_key(object)
+                .load_file_info_versions_exact(&bucket, object)
+                .await
+                .expect("target metadata should remain readable")
+                .is_none(),
+            "an already consumed free version should not be recreated on the target"
+        );
+        shutdown.cancel();
+    }
+
+    #[cfg(feature = "test-util")]
+    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+    #[serial_test::serial(storage_class_env)]
+    async fn decommission_entry_rejects_subquorum_free_version_conflict_and_retains_source() {
+        let temp_dir = tempfile::tempdir().expect("create sub-quorum free-version store dir");
+        let (ctx, store, shutdown) =
+            without_storage_class_env(build_isolated_test_store(temp_dir.path(), "decommission-free-conflict", &[4, 4])).await;
+        crate::bucket::metadata_sys::init_bucket_metadata_sys(store.clone(), Vec::new()).await;
+        let bucket = format!("decom-free-conflict-{}", uuid::Uuid::new_v4());
+        let object = "free-conflict-object";
+        store
+            .make_bucket(&bucket, &MakeBucketOptions::default())
+            .await
+            .expect("create sub-quorum conflict bucket");
+        let (_, free_version) = seed_transitioned_free_version(&ctx, &store, &bucket, object).await;
+        let source_free = store.pools[0]
+            .get_disks_by_key(object)
+            .load_file_info_versions_exact(&bucket, object)
+            .await
+            .expect("source free version should decode before crash replay setup")
+            .and_then(|versions| {
+                versions
+                    .versions
+                    .into_iter()
+                    .find(|version| version.version_id == Some(free_version))
+            })
+            .expect("source free version should be available for crash replay setup");
+
+        let mut target_reader = PutObjReader::from_vec(b"target ordinary bytes".to_vec());
+        let target = store.pools[1]
+            .put_object(
+                &bucket,
+                object,
+                &mut target_reader,
+                &ObjectOptions {
+                    versioned: true,
+                    ..Default::default()
+                },
+            )
+            .await
+            .expect("seed ordinary target version");
+        let target_version = target.version_id.expect("target version must have an ID");
+        let target_disks = store.pools[1].get_disks_by_key(object).disks.read().await.clone();
+        for disk in target_disks.iter().skip(1) {
+            disk.as_ref()
+                .expect("target crash replay quorum disk should be online")
+                .write_metadata("", &bucket, object, source_free.clone())
+                .await
+                .expect("seed an equivalent free version on the target quorum");
+        }
+        let conflict_path = temp_dir
+            .path()
+            .join(format!("pool1/set0/disk0/{bucket}/{object}/{STORAGE_FORMAT_FILE}"));
+        let encoded = tokio::fs::read(&conflict_path)
+            .await
+            .expect("target metadata should be readable");
+        let mut metadata = FileMeta::load(&encoded).expect("target metadata should decode");
+        let target_index = metadata
+            .versions
+            .iter()
+            .position(|version| version.header.version_id == Some(target_version))
+            .expect("target version should be present on the conflict disk");
+        let mut target_meta = metadata.versions[target_index]
+            .parse_version_meta()
+            .expect("target version metadata should decode");
+        target_meta
+            .object
+            .as_mut()
+            .expect("target conflict must remain an ordinary object")
+            .version_id = Some(free_version);
+        metadata.versions[target_index] = target_meta.try_into().expect("conflict metadata should encode");
+        let expected_conflict_meta = metadata.versions[target_index].meta.clone();
+        let expected_conflict = metadata.versions[target_index]
+            .into_fileinfo(&bucket, object, true)
+            .expect("conflict metadata should decode as an ordinary object");
+        let duplicate_free: rustfs_filemeta::FileMetaShallowVersion = rustfs_filemeta::FileMetaVersion::from(source_free.clone())
+            .try_into()
+            .expect("duplicate free metadata should encode");
+        metadata.versions.insert(target_index, duplicate_free);
+        tokio::fs::write(&conflict_path, metadata.marshal_msg().expect("conflict metadata should encode"))
+            .await
+            .expect("write sub-quorum conflict metadata");
+
+        mark_test_pool_decommissioning(&store, 0).await;
+        let source_set = store.pools[0].get_disks_by_key(object);
+        store
+            .decommission_entry_for_test_with_bucket_incarnation(
+                0,
+                MetaCacheEntry {
+                    name: object.to_string(),
+                    ..Default::default()
+                },
+                bucket.clone(),
+                source_set.clone(),
+            )
+            .await
+            .expect("conflicted decommission entry should retain the source and retry later");
+
+        let source_versions = source_set
+            .load_file_info_versions_exact(&bucket, object)
+            .await
+            .expect("retained source versions should decode")
+            .expect("source free version should be retained after conflict");
+        assert!(
+            source_versions
+                .versions
+                .iter()
+                .any(|version| { version.version_id == Some(free_version) && version.tier_free_version() })
+        );
+        let post_encoded = tokio::fs::read(&conflict_path)
+            .await
+            .expect("conflict metadata should remain readable");
+        let post_metadata = FileMeta::load(&post_encoded).expect("post-conflict metadata should decode");
+        let same_id = post_metadata
+            .versions
+            .iter()
+            .filter(|version| version.header.version_id == Some(free_version))
+            .collect::<Vec<_>>();
+        assert_eq!(same_id.len(), 2, "conflict metadata should retain both same-ID records");
+        assert_eq!(same_id.iter().filter(|version| version.header.free_version()).count(), 1);
+        assert_eq!(same_id.iter().filter(|version| !version.header.free_version()).count(), 1);
+        let post_conflict = same_id
+            .into_iter()
+            .find(|version| !version.header.free_version())
+            .expect("ordinary conflict version must remain addressable by the source ID");
+        let post_conflict_info = post_conflict
+            .into_fileinfo(&bucket, object, true)
+            .expect("post-conflict ordinary metadata should decode");
+        assert!(!post_conflict_info.deleted && !post_conflict_info.tier_free_version());
+        assert_eq!(post_conflict.meta, expected_conflict_meta);
+        assert_eq!(post_conflict_info.size, expected_conflict.size);
+        assert_eq!(post_conflict_info.data_dir, expected_conflict.data_dir);
+        assert_eq!(post_conflict_info.metadata, expected_conflict.metadata);
+        assert_eq!(post_conflict_info.get_etag(), expected_conflict.get_etag());
+
+        for disk_index in 0..4 {
+            let target_path = temp_dir
+                .path()
+                .join(format!("pool1/set0/disk{disk_index}/{bucket}/{object}/{STORAGE_FORMAT_FILE}"));
+            let target_encoded = tokio::fs::read(&target_path)
+                .await
+                .expect("target metadata should remain readable");
+            let target_meta = FileMeta::load(&target_encoded).expect("target metadata should decode");
+            let same_id = target_meta
+                .versions
+                .iter()
+                .filter(|version| version.header.version_id == Some(free_version))
+                .collect::<Vec<_>>();
+            if disk_index == 0 {
+                assert_eq!(same_id.len(), 2);
+                assert!(same_id[0].header.free_version());
+                assert!(!same_id[1].header.free_version());
+            } else {
+                assert_eq!(same_id.len(), 1);
+                assert!(same_id[0].header.free_version());
+            }
+        }
+        let sweep_err = store
+            .check_after_decommission_for_test(0)
+            .await
+            .expect_err("final sweep must report the retained free version");
+        assert!(
+            sweep_err.to_string().contains("version(s) were found"),
+            "unexpected final sweep error: {sweep_err}"
+        );
+        shutdown.cancel();
+    }
+
     #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
     #[serial_test::serial(storage_class_env)]
     async fn versioned_batch_delete_marker_skips_decommission_source() {

crates/ecstore/src/store/mod.rs

@@ -151,7 +151,7 @@ pub(crate) mod init_format;
 pub(crate) mod list_objects;
 mod multipart;
 mod object;
-pub(crate) use object::{ObjectLockDiagGuard, SourceCleanupMutationFence};
+pub(crate) use object::{ObjectLockDiagGuard, SourceCleanupMutationFence, tiered_data_movement_source_matches};
 pub use object::{
     PrepareSelectObjectSnapshotError, PreparedGetObjectReader, SelectObjectSnapshot, SelectObjectSnapshotReadError,
     SnapshotConsistencyError,

crates/ecstore/src/store/object.rs

@@ -490,6 +490,82 @@ fn decommission_mutation_fence_for_test(
         .map(|hook| hook.fence.clone())
 }
 
+#[cfg(test)]
+struct DecommissionFreeVersionSourceRaceState {
+    bucket: String,
+    object: String,
+    arrived: tokio::sync::Notify,
+    release: tokio::sync::Notify,
+}
+
+#[cfg(test)]
+pub(crate) struct DecommissionFreeVersionSourceRaceBarrier {
+    state: Arc<DecommissionFreeVersionSourceRaceState>,
+}
+
+#[cfg(test)]
+static DECOMMISSION_FREE_VERSION_SOURCE_RACE_BARRIER: std::sync::OnceLock<
+    std::sync::Mutex<Option<Arc<DecommissionFreeVersionSourceRaceState>>>,
+> = std::sync::OnceLock::new();
+
+#[cfg(test)]
+impl DecommissionFreeVersionSourceRaceBarrier {
+    pub(crate) fn install(bucket: &str, object: &str) -> Self {
+        let state = Arc::new(DecommissionFreeVersionSourceRaceState {
+            bucket: bucket.to_string(),
+            object: object.to_string(),
+            arrived: tokio::sync::Notify::new(),
+            release: tokio::sync::Notify::new(),
+        });
+        let mut slot = DECOMMISSION_FREE_VERSION_SOURCE_RACE_BARRIER
+            .get_or_init(|| std::sync::Mutex::new(None))
+            .lock()
+            .expect("decommission free-version source race barrier should not poison");
+        assert!(slot.is_none(), "decommission free-version source race barrier must be unique");
+        *slot = Some(Arc::clone(&state));
+        Self { state }
+    }
+
+    pub(crate) async fn wait_until_paused(&self) {
+        tokio::time::timeout(Duration::from_secs(30), self.state.arrived.notified())
+            .await
+            .expect("decommission should pause before acquiring the free-version source lock");
+    }
+
+    pub(crate) fn release(&self) {
+        self.state.release.notify_one();
+    }
+}
+
+#[cfg(test)]
+impl Drop for DecommissionFreeVersionSourceRaceBarrier {
+    fn drop(&mut self) {
+        self.state.release.notify_one();
+        let mut slot = DECOMMISSION_FREE_VERSION_SOURCE_RACE_BARRIER
+            .get_or_init(|| std::sync::Mutex::new(None))
+            .lock()
+            .expect("decommission free-version source race barrier should not poison");
+        if slot.as_ref().is_some_and(|state| Arc::ptr_eq(state, &self.state)) {
+            *slot = None;
+        }
+    }
+}
+
+#[cfg(test)]
+async fn pause_decommission_free_version_before_source_lock(bucket: &str, object: &str) {
+    let state = DECOMMISSION_FREE_VERSION_SOURCE_RACE_BARRIER
+        .get_or_init(|| std::sync::Mutex::new(None))
+        .lock()
+        .expect("decommission free-version source race barrier should not poison")
+        .as_ref()
+        .filter(|state| state.bucket == bucket && state.object == object)
+        .cloned();
+    if let Some(state) = state {
+        state.arrived.notify_one();
+        state.release.notified().await;
+    }
+}
+
 pub(crate) struct SourceCleanupMutationFence {
     guard: ObjectLockDiagGuard,
     source_lock_covered: bool,
@@ -1494,13 +1570,15 @@ fn is_equivalent_data_movement_tiered_object(source: &rustfs_filemeta::FileInfo,
         && source_actual_size == target_actual_size
 }
 
-fn tiered_data_movement_source_matches(
+pub(crate) fn tiered_data_movement_source_matches(
     expected: &rustfs_filemeta::FileInfo,
     current: &rustfs_filemeta::FileInfo,
 ) -> Result<bool> {
     let expected_backend = crate::services::tier::tier::tier_destination_id_from_metadata(&expected.metadata)?;
     let current_backend = crate::services::tier::tier::tier_destination_id_from_metadata(&current.metadata)?;
     Ok(expected.version_id == current.version_id
+        && expected.deleted == current.deleted
+        && expected.tier_free_version() == current.tier_free_version()
         && expected.data_dir == current.data_dir
         && expected.mod_time == current.mod_time
         && expected.size == current.size
@@ -1514,6 +1592,15 @@ fn tiered_data_movement_source_matches(
         && expected_backend == current_backend)
 }
 
+fn decommission_free_version_overwrite_error(bucket: &str, object: &str, version_id: Option<Uuid>) -> Error {
+    StorageError::DataMovementOverwriteErr(
+        bucket.to_owned(),
+        object.to_owned(),
+        version_id.map(|id| id.to_string()).unwrap_or_default(),
+    )
+    .into()
+}
+
 fn should_check_data_movement_resume_target(src_pool_idx: usize, target_pool_idx: usize) -> bool {
     target_pool_idx != src_pool_idx
 }
@@ -2221,6 +2308,23 @@ impl ECStore {
         )
     }
 
+    async fn has_equivalent_data_movement_tier_free_version(
+        &self,
+        bucket: &str,
+        object: &str,
+        source: &rustfs_filemeta::FileInfo,
+        opts: &ObjectOptions,
+        target_pool_idx: usize,
+    ) -> Result<bool> {
+        let pool = self
+            .pools
+            .get(target_pool_idx)
+            .ok_or_else(|| Error::other(format!("invalid tiered data movement target pool {target_pool_idx}")))?;
+        pool.get_disks_by_key(object)
+            .has_decommission_tier_free_version_write_quorum(bucket, object, source, opts)
+            .await
+    }
+
     fn resolve_decommission_target_pool_idx_result(result: Result<usize>, bucket: &str, object: &str) -> Result<usize> {
         result.map_err(|err| Error::other(format!("failed to select decommission target pool for {bucket}/{object}: {err}")))
     }
@@ -2240,6 +2344,10 @@ impl ECStore {
         check_put_object_args(bucket, object)?;
 
         let mut opts = opts.clone();
+        let is_free_version = fi.tier_free_version();
+        if is_free_version {
+            opts.incl_free_versions = true;
+        }
         let bucket_incarnation_fence = if is_meta_bucketname(bucket) {
             None
         } else {
@@ -2277,6 +2385,10 @@ impl ECStore {
                 &object,
             )?
         };
+        #[cfg(test)]
+        if is_free_version {
+            pause_decommission_free_version_before_source_lock(bucket, logical_object).await;
+        }
         let _object_guards = self
             .acquire_data_movement_object_write_locks(bucket, &object, opts.src_pool_idx, idx, &mut opts)
             .await?;
@@ -2294,7 +2406,7 @@ impl ECStore {
                 versions
                     .versions
                     .iter()
-                    .find(|current| current.version_id == fi.version_id && !current.tier_free_version())
+                    .find(|current| current.version_id == fi.version_id && current.tier_free_version() == is_free_version)
             })
             .ok_or_else(|| to_object_err(StorageError::FileNotFound, vec![bucket, object.as_str()]))?;
         if !tiered_data_movement_source_matches(fi, current_source)? {
@@ -2309,24 +2421,40 @@ impl ECStore {
                 .get_available_pool_idx_excluding(bucket, &object, fi.size, opts.src_pool_idx)
                 .await;
             let target_pool_idx = resolve_data_movement_resume_target_pool(idx, resume_target_pool_idx, opts.src_pool_idx);
+            if is_free_version && target_pool_idx == opts.src_pool_idx {
+                return Err(Error::DiskFull);
+            }
+            let equivalent = if is_free_version {
+                self.has_equivalent_data_movement_tier_free_version(bucket, &object, &fi, &opts, target_pool_idx)
+                    .await?
+            } else {
+                self.has_equivalent_data_movement_tiered_object(bucket, &object, &fi, &opts, target_pool_idx)
+                    .await?
+            };
+            if equivalent {
+                return Ok(());
+            }
+
+            return Err(decommission_free_version_overwrite_error(bucket, &object, fi.version_id));
+        }
+
+        let result = if is_free_version {
             if self
-                .has_equivalent_data_movement_tiered_object(bucket, &object, &fi, &opts, target_pool_idx)
+                .has_equivalent_data_movement_tier_free_version(bucket, &object, &fi, &opts, idx)
                 .await?
             {
                 return Ok(());
             }
-
-            return Err(StorageError::DataMovementOverwriteErr(
-                bucket.to_owned(),
-                object.to_owned(),
-                opts.version_id.clone().unwrap_or_default(),
-            ));
-        }
-
-        let result = self.pools[idx]
-            .get_disks_by_key(&object)
-            .decommission_tiered_object(bucket, &object, &fi, &opts)
-            .await;
+            self.pools[idx]
+                .get_disks_by_key(&object)
+                .decommission_tier_free_version(bucket, &object, &fi, &opts)
+                .await
+        } else {
+            self.pools[idx]
+                .get_disks_by_key(&object)
+                .decommission_tiered_object(bucket, &object, &fi, &opts)
+                .await
+        };
         if matches!(result, Err(Error::PreconditionFailed)) {
             if self
                 .has_equivalent_data_movement_tiered_object(bucket, &object, &fi, &opts, idx)
@@ -3194,7 +3322,7 @@ impl ECStore {
 
         // Default return value
         let mut del_objects = vec![DeletedObject::default(); objects.len()];
-        let mut accounting = vec![None; objects.len()];
+        let accounting = vec![None; objects.len()];
 
         let mut del_errs = Vec::with_capacity(objects.len());
         for _ in 0..objects.len() {

crates/ecstore/src/store/rebalance/support.rs

@@ -271,7 +271,7 @@ pub(super) fn resolve_latest_object_info_candidates(
             .filter(|candidate| latest_candidate_mod_time(candidate) == Some(latest_mod_time))
             .collect::<Vec<_>>();
 
-        latest_candidates.sort_by(|left, right| right.idx.cmp(&left.idx));
+        latest_candidates.sort_by_key(|candidate| std::cmp::Reverse(candidate.idx));
 
         let Some(winner) = latest_candidates.first() else {
             return Err(Error::ErasureReadQuorum);

crates/filemeta/src/filemeta.rs

@@ -90,6 +90,21 @@ fn legacy_data_key_for_version(version_id: Option<Uuid>) -> Option<String> {
 pub const TRANSITION_COMPLETE: &str = "complete";
 pub const TRANSITION_PENDING: &str = "pending";
 
+/// xl.meta key marking a tier free-version record.
+///
+/// A free version is a delete-marker-shaped cleanup hint appended by
+/// [`MetaObject::delete_version`] when a version whose remote transition
+/// completed is removed from xl.meta; it carries the remote tier identity for
+/// an idempotent remote delete and is never a user-visible version
+/// (`num_versions` excludes it). While the record exists it is consumed by the
+/// lifecycle free-version recovery scan and the usage scanner, which re-enqueue
+/// the pending remote delete, and by heal metadata walks. On S3 and lifecycle
+/// delete paths the same obligation is also carried by a committed tier-journal
+/// entry; deletes without such an entry (for example a removed version whose
+/// transition state decodes as unknown) rely on this record alone until the
+/// worker removes it after a successful remote delete. Decommission preserves
+/// the record and its remote identity on the target pool before source cleanup
+/// — see docs/architecture/decommission-compatibility.md.
 pub const FREE_VERSION: &str = "free-version";
 
 pub const TRANSITION_STATUS: &str = "transition-status";
@@ -447,6 +462,10 @@ impl FileMeta {
         };
 
         if let Some(fidx) = existing_idx {
+            let existing = self.versions[fidx].parse_version_meta()?;
+            if existing.free_version() != version.free_version() {
+                return Err(Error::other("cannot replace a free version with a non-free version"));
+            }
             return self.set_idx(fidx, version);
         }
 

crates/filemeta/src/filemeta/version.rs

@@ -2725,6 +2725,15 @@ impl MetaObject {
         self.meta_sys.retain(|k, _| !k.starts_with("X-Amz-Restore"));
     }
 
+    /// Builds the free-version cleanup record appended when a transitioned
+    /// version is removed from xl.meta. The record keeps the remote tier
+    /// identity so the lifecycle worker can issue the idempotent remote delete
+    /// and only then remove the record; until then the recovery scan and the
+    /// usage scanner keep re-enqueueing it. S3 and lifecycle deletes also
+    /// persist a committed tier-journal entry for the same remote delete. The
+    /// decommission path copies this record unchanged before source cleanup,
+    /// including when the transition state is unknown — see
+    /// docs/architecture/decommission-compatibility.md.
     pub fn init_free_version(&self, fi: &FileInfo) -> Result<(FileMetaVersion, bool)> {
         if fi.skip_tier_free_version() {
             return Ok((FileMetaVersion::default(), false));

crates/kms/tests/vault_ha_failover_live.rs

@@ -16,14 +16,14 @@
 //!
 //! `scripts/test/vault_ha_kms_live.sh` owns the official Vault containers and
 //! kills the active node while this test continuously decrypts through a
-//! surviving standby. KV2 and Transit requests must remain successful, use a
-//! bounded number of attempts, and leave the circuit and in-flight gauges at
-//! zero after a new leader is elected.
+//! surviving standby. KV2 and Transit must recover after the bounded circuit
+//! interval, use a bounded number of attempts, and leave the circuit and
+//! in-flight gauges at zero after a new leader is elected.
 
 use std::collections::HashMap;
 use std::path::{Path, PathBuf};
-use std::sync::Arc;
 use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
+use std::sync::{Arc, Mutex};
 use std::time::Duration;
 
 use metrics_util::MetricKind;
@@ -43,6 +43,11 @@ const OPERATION_ATTEMPTS: &str = "rustfs_kms_backend_operation_attempts";
 const IN_FLIGHT: &str = "rustfs_kms_backend_in_flight";
 const CIRCUIT_OPEN: &str = "rustfs_kms_backend_circuit_open";
 const MAX_ATTEMPTS: u32 = 10;
+const ATTEMPT_TIMEOUT: Duration = Duration::from_secs(2);
+const HEALTHY_PROGRESS_TIMEOUT: Duration = Duration::from_secs(20);
+// The circuit remains open for 30s after five failed attempts.
+const POST_FAILOVER_PROGRESS_TIMEOUT: Duration = Duration::from_secs(35);
+const FAILOVER_ERROR_POLL_INTERVAL: Duration = Duration::from_millis(100);
 
 type MetricEntry = (
     metrics_util::CompositeKey,
@@ -64,7 +69,7 @@ fn config(backend: KmsBackend, backend_config: BackendConfig) -> KmsConfig {
         backend,
         backend_config,
         allow_insecure_dev_defaults: true,
-        timeout: Duration::from_secs(2),
+        timeout: ATTEMPT_TIMEOUT,
         retry_attempts: MAX_ATTEMPTS,
         enable_cache: false,
         ..KmsConfig::default()
@@ -164,14 +169,31 @@ fn retryable_failures(snapshot: &[MetricEntry], operation: &str) -> u64 {
         .sum()
 }
 
-async fn wait_for_count(counter: &AtomicU64, minimum: u64, description: &str) {
-    tokio::time::timeout(Duration::from_secs(20), async {
+async fn wait_for_count(
+    counter: &AtomicU64,
+    failure: &Mutex<Option<String>>,
+    minimum: u64,
+    description: &str,
+    timeout: Duration,
+) {
+    tokio::time::timeout(timeout, async {
         while counter.load(Ordering::SeqCst) < minimum {
+            if let Some(error) = failure.lock().expect("decrypt failure lock poisoned").as_ref() {
+                panic!(
+                    "{description} worker failed after {} successful decrypts: {error}",
+                    counter.load(Ordering::SeqCst)
+                );
+            }
             tokio::time::sleep(Duration::from_millis(25)).await;
         }
     })
     .await
-    .unwrap_or_else(|_| panic!("timed out waiting for {description}"));
+    .unwrap_or_else(|_| {
+        panic!(
+            "timed out after {timeout:?} waiting for {description}: completed {}, expected {minimum}",
+            counter.load(Ordering::SeqCst)
+        )
+    });
 }
 
 async fn wait_for_file(path: &Path, description: &str) {
@@ -189,7 +211,8 @@ async fn decrypt_loop<B: KmsBackendTrait + Send + Sync + 'static>(
     request: DecryptRequest,
     expected: Vec<u8>,
     completed: Arc<AtomicU64>,
-    failed: Arc<AtomicBool>,
+    allow_failover_errors: Arc<AtomicBool>,
+    failure: Arc<Mutex<Option<String>>>,
     stop: CancellationToken,
 ) {
     while !stop.is_cancelled() {
@@ -197,8 +220,18 @@ async fn decrypt_loop<B: KmsBackendTrait + Send + Sync + 'static>(
             Ok(response) if response.plaintext == expected => {
                 completed.fetch_add(1, Ordering::SeqCst);
             }
-            Ok(_) | Err(_) => {
-                failed.store(true, Ordering::SeqCst);
+            Ok(_) => {
+                *failure.lock().expect("decrypt failure lock poisoned") =
+                    Some("decrypt returned unexpected plaintext".to_string());
+                return;
+            }
+            Err(rustfs_kms::KmsError::BackendError { .. } | rustfs_kms::KmsError::OperationTimedOut { .. })
+                if allow_failover_errors.load(Ordering::SeqCst) =>
+            {
+                tokio::time::sleep(FAILOVER_ERROR_POLL_INTERVAL).await;
+            }
+            Err(error) => {
+                *failure.lock().expect("decrypt failure lock poisoned") = Some(error.to_string());
                 return;
             }
         }
@@ -296,7 +329,9 @@ async fn exercise_failover(snapshotter: &Snapshotter) {
     );
 
     let stop = CancellationToken::new();
-    let failed = Arc::new(AtomicBool::new(false));
+    let allow_failover_errors = Arc::new(AtomicBool::new(false));
+    let kv2_failure = Arc::new(Mutex::new(None));
+    let transit_failure = Arc::new(Mutex::new(None));
     let kv2_completed = Arc::new(AtomicU64::new(0));
     let transit_completed = Arc::new(AtomicU64::new(0));
     let kv2_worker = tokio::spawn(decrypt_loop(
@@ -304,7 +339,8 @@ async fn exercise_failover(snapshotter: &Snapshotter) {
         kv2_request,
         kv2_data_key.plaintext_key,
         Arc::clone(&kv2_completed),
-        Arc::clone(&failed),
+        Arc::clone(&allow_failover_errors),
+        Arc::clone(&kv2_failure),
         stop.clone(),
     ));
     let transit_worker = tokio::spawn(decrypt_loop(
@@ -312,12 +348,21 @@ async fn exercise_failover(snapshotter: &Snapshotter) {
         transit_request,
         transit_data_key.plaintext_key,
         Arc::clone(&transit_completed),
-        Arc::clone(&failed),
+        Arc::clone(&allow_failover_errors),
+        Arc::clone(&transit_failure),
         stop.clone(),
     ));
 
-    wait_for_count(&kv2_completed, 2, "two healthy KV2 decrypts").await;
-    wait_for_count(&transit_completed, 2, "two healthy Transit decrypts").await;
+    wait_for_count(&kv2_completed, &kv2_failure, 2, "two healthy KV2 decrypts", HEALTHY_PROGRESS_TIMEOUT).await;
+    wait_for_count(
+        &transit_completed,
+        &transit_failure,
+        2,
+        "two healthy Transit decrypts",
+        HEALTHY_PROGRESS_TIMEOUT,
+    )
+    .await;
+    allow_failover_errors.store(true, Ordering::SeqCst);
     std::fs::write(&marker, b"ready").expect("publish failover readiness marker");
 
     wait_for_file(&elected, "the replacement Vault leader").await;
@@ -326,18 +371,39 @@ async fn exercise_failover(snapshotter: &Snapshotter) {
 
     let kv2_after_election = kv2_completed.load(Ordering::SeqCst) + 2;
     let transit_after_election = transit_completed.load(Ordering::SeqCst) + 2;
-    wait_for_count(&kv2_completed, kv2_after_election, "post-failover KV2 decrypts").await;
-    wait_for_count(&transit_completed, transit_after_election, "post-failover Transit decrypts").await;
+    wait_for_count(
+        &kv2_completed,
+        &kv2_failure,
+        kv2_after_election,
+        "post-failover KV2 decrypts",
+        POST_FAILOVER_PROGRESS_TIMEOUT,
+    )
+    .await;
+    wait_for_count(
+        &transit_completed,
+        &transit_failure,
+        transit_after_election,
+        "post-failover Transit decrypts",
+        POST_FAILOVER_PROGRESS_TIMEOUT,
+    )
+    .await;
 
     stop.cancel();
     kv2_worker.await.expect("KV2 decrypt worker must join");
     transit_worker.await.expect("Transit decrypt worker must join");
-    assert!(!failed.load(Ordering::SeqCst), "no decrypt may fail or return different plaintext");
+    assert!(
+        kv2_failure.lock().expect("KV2 failure lock poisoned").is_none(),
+        "no KV2 decrypt may fail or return different plaintext"
+    );
+    assert!(
+        transit_failure.lock().expect("Transit failure lock poisoned").is_none(),
+        "no Transit decrypt may fail or return different plaintext"
+    );
 }
 
 #[test]
 #[ignore = "requires a real three-node Vault Raft cluster; run scripts/test/vault_ha_kms_live.sh"]
-fn vault_raft_leader_failure_preserves_kv2_and_transit_decrypts() {
+fn vault_raft_leader_failure_recovers_kv2_and_transit_decrypts() {
     let recorder = DebuggingRecorder::new();
     let snapshotter = recorder.snapshotter();
     metrics::with_local_recorder(&recorder, || {
@@ -349,11 +415,6 @@ fn vault_raft_leader_failure_preserves_kv2_and_transit_decrypts() {
     });
     let snapshot = snapshotter.snapshot().into_vec();
 
-    assert_eq!(
-        counter_value(&snapshot, OPERATIONS_TOTAL, &[("outcome", "circuit_open")]),
-        0,
-        "a bounded leader election must not open the circuit"
-    );
     assert_eq!(
         counter_value(&snapshot, OPERATIONS_TOTAL, &[("outcome", "budget_exhausted")]),
         0,

deny.toml

@@ -43,9 +43,6 @@ allow-git = [
     # RustFS fork carrying presigned expiry and constant-time authentication fixes.
     # owner: rustfs-maintainers  review: 2026-10
     "https://github.com/rustfs/s3s.git",
-    # MiMalloc fork pinned for hotpath allocation counting support.
-    # owner: houseme  review: 2026-10
-    "https://github.com/xonatius/mimalloc_rust.git",
 ]
 
 [bans]

docs/architecture/decommission-compatibility.md

@@ -153,6 +153,99 @@ No migration step is required for these decisions because this note documents th
 current RustFS behavior. Changing either decision later requires an operator
 compatibility note and updated characterization tests.
 
+## Tier Free Versions During Decommission
+
+A tier free version is an internal xl.meta record (`rustfs_filemeta::FREE_VERSION`,
+flagged `XL_FLAG_FREE_VERSION`) shaped like a delete marker. It is created by
+`MetaObject::init_free_version` when a version whose remote transition completed is
+deleted locally: the visible version is removed and the record keeps the remote-tier
+identity (tier, object name, version id, state, destination id) needed for an
+idempotent remote delete. Free versions are not user-visible versions; `num_versions`
+and all listing/GET paths exclude them.
+
+### Lifecycle And Consumers
+
+Creation: any local delete that removes a version whose transition status is
+`complete` appends the record via `MetaObject::delete_version` →
+`init_free_version` (skipped only when `skip_tier_free_version` is set, as on
+data-movement copies). The same deletes also persist a durable tier-journal
+entry on every user-facing path: S3 single deletes (`execute_delete_object` →
+`delete_object_with_tier_delete_journal`), S3 batch deletes, lifecycle expiry,
+and lifecycle delete-all all prepare and commit a journal entry around the
+delete. A journal entry is omitted when the removed version's transition state
+decodes as `TransitionVersionState::Unknown`, or on internal journal-less
+delete paths that never touch transitioned user objects.
+
+Consumption while the record exists: the background recovery loop started by
+`init_background_expiry` (spawned by `spawn_tier_free_version_recovery_once`,
+enabled by default) scans disks for pending records and re-enqueues them; the
+usage scanner does the same; the lifecycle worker then deletes the remote tier
+object idempotently and only afterwards removes the local record. Heal walks
+include free-version records in metadata healing. Transition planning,
+replication, restore, GET, listings, and usage aggregation never depend on
+them.
+
+### Decommission Handling
+
+The exact decommission inventory loader (`load_file_info_versions_exact` via
+`get_all_file_info_versions`) keeps free-version records inline in `versions`.
+The migration loop handles them before lifecycle expiry and delete-marker
+shortcuts. It selects a target pool using the free-version-aware lookup, then
+writes the original free record to every target disk with the normal metadata
+write quorum. The free-version marker, local version id, transition identity,
+transition state, and destination id are preserved at the FileInfo/metadata
+boundary.
+
+The source record is physically removed only after the target write quorum has
+committed and the source cleanup preflight still matches the exact inventory.
+If the lifecycle worker has already completed the remote delete and removed the
+source record before decommission acquires the source lock, decommission records
+that identity as already consumed and treats the missing source record as safe.
+If target capacity, metadata validation, lock fencing, or quorum fails, the
+source record remains and the entry records `state = "free_version_retained"`
+with reason `tier_free_version_migration_failed`; the worker retries the
+operation on a later pass. A target record with the same version id is accepted
+only when its free-version identity matches; a conflicting ordinary version or
+different free record is an overwrite error. This makes retries idempotent and
+prevents a free record from replacing a user-visible version.
+
+### Reference-Audit Result
+
+After migration, user-facing GET/list/transition/replication/restore paths still
+exclude the record. Recovery, usage scanning, lifecycle tier cleanup, and heal
+continue to see it when they request free versions, so an unresolved remote
+delete remains actionable on the target pool. The committed tier journal remains
+an independent retry source where one exists; it is not used as a reason to drop
+the xl.meta record. In particular, `Unknown` transition state records are
+migrated unchanged rather than discarded: the lifecycle worker retains them if
+remote identity validation cannot make a delete request.
+
+Each migrated record emits `state = "free_version_migrated"` with reason
+`tier_free_version_migrated`. A record consumed before migration emits
+`state = "free_version_consumed"` with reason
+`tier_free_version_already_consumed`. Each failed record emits the retained state
+and failure reason above. The entry also emits a disposition summary with
+migrated, consumed, retained, and total counts. The final decommission sweep uses
+the exact loader, counts free records still present, and emits one retained
+record/reason for each unresolved free version before failing the sweep. This
+makes successful migration, completed cleanup, and retained cleanup obligations
+visible instead of silently omitting free records.
+
+No new S3-visible version or admin response field is needed: free versions remain
+internal and are never counted as user-visible versions. The structured
+`decommission_entry` events are the operational status surface for the
+free-version disposition; the existing decommission item/failed counters still
+report the enclosing object migration result.
+
+Regression guard:
+
+- `decommission_tier_free_version_preserves_remote_identity`
+- `decommission_tier_free_version_resume_requires_write_quorum`
+- `decommission_tier_free_version_commit_rejects_lost_fence`
+- `test_decommission_cleanup_preflight_accepts_migrated_free_version_consumed_from_source`
+- `decommission_entry_skips_cleanup_only_marker_when_free_version_is_present`
+- `decommission_entry_rejects_subquorum_free_version_conflict_and_retains_source`
+
 ## Regression Guard
 
 The queued multi-pool contract is guarded by:

docs/testing/ci-gates.md

@@ -0,0 +1,149 @@
+# CI gate matrix
+
+This file is the source of truth for which validation runs on each event, its
+configured wall-clock budget, and whether it can block a merge. Test taxonomy,
+naming, and nextest serialization rules remain in [README.md](README.md); e2e
+membership and counts remain in
+[e2e-suite-inventory.md](e2e-suite-inventory.md).
+
+The distinction between **required** and **report-only** is load-bearing:
+a failing job blocks a merge only when its exact check name is present in the
+live `main` ruleset. A workflow name, a `merge_group` trigger, or a red PR check
+does not make a job required by itself.
+
+## Required merge checks
+
+The live `main` ruleset (`6436880`) currently requires exactly these contexts:
+
+| Required context | Producer | Validation |
+|---|---|---|
+| `CLA Check` | `.github/workflows/cla.yml` | Contributor agreement |
+| `Quick Checks` | `.github/workflows/ci.yml` | Formatting and repository guard scripts |
+| `Test and Lint` | `.github/workflows/ci.yml` | Clippy, workspace nextest excluding `e2e_test`, doctests, and migration proofs |
+
+For pull requests limited to the paths excluded by the main CI workflow,
+`.github/workflows/ci-docs-only.yml` reports `Quick Checks` and
+`Test and Lint` under the same names. It runs the real quick checks and the
+planning-document guard; it does not claim that Rust compilation or runtime
+tests ran. Despite the workflow name, these paths also include selected deploy,
+workflow, and lock files.
+
+Verify the live rule rather than trusting this snapshot before changing merge
+policy:
+
+```bash
+gh api repos/rustfs/rustfs/rulesets/6436880 \
+  --jq '.rules[] | select(.type == "required_status_checks") | .parameters'
+```
+
+The ruleset currently has `strict_required_status_checks_policy=false`.
+`Continuous Integration` accepts `merge_group` events and runs `e2e-full` for
+them, but `End-to-End Tests (full merge gate)` is not currently a required
+context. Therefore the repository is prepared to test a merge-queue SHA, but
+the workflow alone does not prove that every merge passed that lane.
+
+## Pull request and merge matrix
+
+Budgets below are job `timeout-minutes`, not typical runtimes. “Report-only”
+means the result is visible and actionable but is not in the live required
+context list.
+
+| Event | Validation | Budget | Merge status | Reproduction |
+|---|---|---:|---|---|
+| PR, non-doc change | `Quick Checks` | 10 min | Required | `make pre-commit` (broader local umbrella) |
+| PR, non-doc change | `Test and Lint` | 90 min | Required | `cargo nextest run --profile ci --all --exclude e2e_test` |
+| PR, non-doc change | `Typos` | 10 min | Report-only | `typos` |
+| PR, non-doc change | `ILM Integration (serial)` | 90 min | Report-only | Use the exact command in `.github/workflows/ci.yml` |
+| PR, non-doc change | rio-v2 / swift / sftp test-and-lint variants | 90 min each | Report-only | `cargo nextest run` with the workflow's feature set |
+| PR, non-doc change | `Build RustFS Debug Binary` | 30 min | Report-only; prerequisite for black-box lanes | `cargo build -p rustfs --bins` |
+| PR, non-doc change | `io_uring Integration (real)` | 30 min | Report-only | `cargo test -p rustfs-ecstore --lib uring_ -- --test-threads=1 --nocapture` |
+| PR, non-doc change | `End-to-End Tests` (`e2e-smoke` plus `s3s-e2e`) | 30 min | Report-only | `cargo nextest run --profile e2e-smoke -p e2e_test`; then `./scripts/e2e-run.sh ./target/debug/rustfs <data-dir>` |
+| PR, non-doc change | `S3 Implemented Tests` | 60 min | Report-only | Build `rustfs`, then run `scripts/s3-tests/run.sh` with `DEPLOY_MODE=binary`, `TEST_MODE=single`, and `MAXFAIL=0` |
+| PR, non-doc change | `S3 Lifecycle Behavior Tests` | 30 min | Report-only | Use the accelerated scanner environment in `.github/workflows/ci.yml` with `scripts/s3-tests/run.sh` |
+| PR touching dependency or workflow inputs | Cargo Deny / Workflow Pin Report / Dependency Review | 20 / 5 / 30 min | Report-only | `cargo deny check`; `scripts/security/check_workflow_pins.sh` |
+| PR touching architecture rules or architecture docs | `Architecture Migration Rules` | 10 min | Report-only | `scripts/check_architecture_migration_rules.sh` |
+| PR touching Nix or workspace manifests | `Nix Build & Check` | 60 min | Report-only | `nix flake check` |
+| PR limited to main-CI-excluded paths | companion `Quick Checks` and `Test and Lint` | 10 min each | Required | `git diff --check`; `make doc-paths-check` when documentation paths changed |
+| `merge_group` | Standard CI plus `e2e-full` | 55 min for `e2e-full` | Standard required contexts only; `e2e-full` report-only | `cargo nextest run --profile e2e-full -p e2e_test` |
+| Push to `main` | Standard CI plus `e2e-full` | 55 min for `e2e-full` | Post-merge detection | Same as `merge_group` |
+| PR touching fuzz inputs or harness paths | Build plus five 60-second fuzz smoke targets | 60 min build; 30 min per target | Report-only | `MAX_TOTAL_TIME=60 ./scripts/fuzz/run.sh` |
+| PR touching selected ecstore disk/format paths | `Rename Safety` on Windows | 60 min | Report-only | Run the four `cargo test -p rustfs-ecstore --lib <filter>` commands in `windows-filesystem.yml` on Windows |
+
+The authoritative e2e filters live in `.config/nextest.toml`; extend a profile
+instead of adding a second ad-hoc selector. Before a profile runs,
+`scripts/check_test_wiring.py` compares its exact membership to the committed
+digest so a silent test drop fails closed.
+
+## Scheduled and manual validation
+
+Scheduled lanes are independent fault domains. They do not block a pull
+request, but their workflow-local gate can fail the run and scheduled failures
+are routed to the shared failure-issue action. The scheduled-validation
+watchdog and freshness workflow separately detect incomplete runs and missing
+schedules.
+
+| Cadence (UTC unless noted) | Workflow / validation | Budget | Verdict and artifacts | Reproduction |
+|---|---|---:|---|---|
+| Daily 02:17 | Fuzz: five nightly corpus targets | 60 min build; 60 min per target | Gate; corpus/crash artifacts, scheduled failure alert | `MAX_TOTAL_TIME=<seconds> ./scripts/fuzz/run.sh` |
+| Daily 03:17 | MinIO interop (EC + SSE read parity) | 40 min | Gate; scheduled failure alert | Dispatch `minio-interop.yml` or follow its pinned Docker fixture steps |
+| Daily 04:29 | Replication / cluster-fault / protocol e2e | 45 / 90 / 90 min | Three independent gates; JUnit, membership, and server logs | `cargo nextest run --profile e2e-repl-nightly -p e2e_test`; `--profile e2e-nightly`; `-j 1 --profile e2e-protocols` |
+| Daily 06:31 | Warp performance A/B | 180 min | Regression budget gate; A/B summaries and server logs | `bash scripts/run_hotpath_warp_abba.sh --help` |
+| Daily 00:07 Asia/Shanghai (16:07 UTC previous day) | Nightly GNU build and Vault lanes | 150 / 90 / 60 min | Build, live Vault, and HA failover gates | Use the commands and pinned Vault images in `nightly-gnu.yml` |
+| Daily 03:23 | Security Audit | 20 / 5 min, plus 30 min on PR dependency review | Cargo Deny and workflow-pin gates; scheduled failure alert | `cargo deny check`; `scripts/security/check_workflow_pins.sh` |
+| Daily 23:47 | Scheduled Validation Freshness | 10 min | Fails when a critical schedule was never created or is stale | Dispatch `scheduled-validation-freshness.yml` |
+| Sunday 00:11 | Full `Continuous Integration` matrix | Per-job budgets above | Weekly variant coverage, including dormant rio-v2 binary/e2e lanes | Dispatch `ci.yml` |
+| Sunday 01:13 | Seven-platform build matrix | 150 min per platform | Build/package integrity; scheduled failure alert | Dispatch `build.yml` with an exact platform set |
+| Sunday 02:19 | Ceph s3-tests full sweep: single and real four-node, four shards each | 180 min per shard | Compatibility gate; report, JUnit, exact node IDs, and server logs | `scripts/s3-tests/run.sh` against an existing single or distributed target |
+| Sunday 06:41 | Mint | 120 min | **Report-only by design**; per-suite PASS/FAIL/NA and raw `log.json` | Reproduce the pinned Docker sequence in `mint.yml` or dispatch it |
+| Sunday 07:43 | Workspace line coverage | 120 min | Report-only trend; lcov and JSON retained 90 days | `make coverage` |
+| Monthly, day 1 06:37 | Runner Hygiene | 15 min | Validates runner ephemerality; scheduled failure alert | Dispatch `runner-hygiene.yml` |
+
+Manual `workflow_dispatch` exists for the scheduled workflows above. Manual
+runs are debugging evidence and intentionally do not open scheduled-failure
+issues. A manual performance run may explicitly allow a known regression; that
+override must not be treated as an ordinary passing baseline.
+
+## Release validation
+
+Release validation is post-merge and tag-driven; it does not substitute for a
+pull-request gate.
+
+| Event | Validation | Budget | Result |
+|---|---|---:|---|
+| Push to `main` or weekly schedule | `Build and Release` platform matrix | 150 min per platform | Build artifacts for all selected targets; no release publication on a main push |
+| Valid release or preview tag | `Build and Release` plus asset checks | 150 min per platform | Draft release, checksummed assets, and publish step |
+| Successful non-preview release-tag build | Docker image build and image scan | 60 min build; 30 min scan | Multi-architecture images plus vulnerability report |
+| Successful release-tag build | DEB/RPM packaging | 30 min per architecture | Packages and checksum files uploaded to the release |
+| Successful non-preview release-tag build | Helm template test and package | 30 min build; 30 min publish | Versioned chart and repository index |
+
+Use an exact preview tag for end-to-end release rehearsal. Manual dispatches
+are backfill/debug paths and do not prove the automatic `workflow_run` chain.
+
+## Evidence requirements
+
+A green check is useful only when it proves the intended behavior ran:
+
+- Record the exact commit SHA and run URL.
+- Separate product failure from runner prerequisites, service readiness, and
+  cancellation. Repair the precondition, then rerun the exact workload.
+- Preserve membership manifests, JUnit, raw compatibility logs, seeds, and
+  server logs where the workflow provides them.
+- For a bug fix or a new fault checker, provide sensitivity evidence: the old
+  behavior or an intentional mutation must fail the new oracle, and the fixed
+  behavior must pass it.
+- Never promote a report-only lane to required from one green run. Require at
+  least 14 days and 30 representative pull requests with at least 99% complete
+  execution, then update the ruleset and this table together.
+
+## Change checklist
+
+Update this file in the same pull request when any of these change:
+
+- workflow triggers, job names, timeouts, or nextest profile ownership;
+- required status contexts or strict/merge-queue policy;
+- scheduled cadence, alert routing, artifact contract, or local reproduction;
+- report-only versus gating semantics.
+
+Do not copy per-module test counts here. Update
+[e2e-suite-inventory.md](e2e-suite-inventory.md) and its enforced membership
+digest instead.

rustfs/Cargo.toml

@@ -336,13 +336,13 @@ opentelemetry = { workspace = true }
 tracing-opentelemetry = { workspace = true }
 # Data structures
 hashbrown = { workspace = true, features = ["serde", "rayon"] }
-mimalloc = { workspace = true }
+rustfs-mimalloc = { workspace = true }
 
 [target.'cfg(target_os = "linux")'.dependencies]
 libsystemd.workspace = true
 
 [target.'cfg(not(target_os = "windows"))'.dependencies]
-libmimalloc-sys.workspace = true
+rustfs-mimalloc-sys.workspace = true
 
 [dev-dependencies]
 uuid = { workspace = true, features = ["v4", "v5", "fast-rng", "macro-diagnostics"] }

rustfs/src/allocator_reclaim.rs

@@ -369,14 +369,8 @@ pub fn allocator_reclaim_controller_snapshot(ctx: &CancellationToken) -> Allocat
 }
 
 #[cfg(not(target_os = "windows"))]
-#[allow(unsafe_code)]
 fn collect_allocator_memory(force: bool) -> Result<(), String> {
-    // SAFETY: `mi_collect` is provided by the active global allocator backend
-    // on this target family. It is explicitly intended to reclaim retained
-    // pages/segments and does not require additional invariants from the caller.
-    unsafe {
-        libmimalloc_sys::mi_collect(force);
-    }
+    rustfs_mimalloc::MiMalloc::collect(force);
     Ok(())
 }
 

rustfs/src/main.rs

@@ -26,22 +26,22 @@ struct MiMallocAllocator;
 unsafe impl GlobalAlloc for MiMallocAllocator {
     unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
         // SAFETY: the caller upholds GlobalAlloc's contract for layout.
-        unsafe { mimalloc::MiMalloc.alloc(layout) }
+        unsafe { rustfs_mimalloc::MiMalloc.alloc(layout) }
     }
 
     unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
         // SAFETY: the caller upholds GlobalAlloc's contract for layout.
-        unsafe { mimalloc::MiMalloc.alloc_zeroed(layout) }
+        unsafe { rustfs_mimalloc::MiMalloc.alloc_zeroed(layout) }
     }
 
     unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
         // SAFETY: ptr and layout came from this allocator and are forwarded unchanged.
-        unsafe { mimalloc::MiMalloc.dealloc(ptr, layout) }
+        unsafe { rustfs_mimalloc::MiMalloc.dealloc(ptr, layout) }
     }
 
     unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
         // SAFETY: ptr and layout came from this allocator and are forwarded unchanged.
-        unsafe { mimalloc::MiMalloc.realloc(ptr, layout, new_size) }
+        unsafe { rustfs_mimalloc::MiMalloc.realloc(ptr, layout, new_size) }
     }
 }
 
@@ -51,7 +51,7 @@ static GLOBAL: hotpath::CountingAllocator<MiMallocAllocator> = hotpath::Counting
 
 #[cfg(not(all(feature = "hotpath", feature = "hotpath-alloc")))]
 #[global_allocator]
-static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
+static GLOBAL: rustfs_mimalloc::MiMalloc = rustfs_mimalloc::MiMalloc;
 
 fn main() {
     let _hotpath_guard = hotpath::HotpathGuardBuilder::new("main").build();
@@ -71,8 +71,9 @@ mod tests {
         allocation.extend_from_slice(&[7_u8; 64]);
 
         assert_eq!(allocation.len(), 64);
+        let heap = rustfs_mimalloc::heap::Heap::main();
         // SAFETY: the live Vec pointer is valid to inspect for heap ownership.
-        assert!(unsafe { libmimalloc_sys::mi_is_in_heap_region(allocation.as_ptr().cast()) });
+        assert!(unsafe { heap.contains(allocation.as_ptr()) });
     }
 
     #[test]
@@ -85,12 +86,13 @@ mod tests {
         let layout = Layout::from_size_align(32, 8).expect("valid test allocation layout");
         let grown_layout = Layout::from_size_align(64, 8).expect("valid grown test allocation layout");
         let allocator = super::MiMallocAllocator;
+        let heap = rustfs_mimalloc::heap::Heap::main();
 
         // SAFETY: The pointer is checked for null before use and later released
         // through the same allocator with the corresponding layout.
         let ptr = unsafe { allocator.alloc_zeroed(layout) };
         assert!(!ptr.is_null());
-        assert!(unsafe { libmimalloc_sys::mi_is_in_heap_region(ptr.cast()) });
+        assert!(unsafe { heap.contains(ptr) });
         assert!(unsafe { std::slice::from_raw_parts(ptr, 32).iter().all(|byte| *byte == 0) });
 
         // SAFETY: `ptr` was allocated by `allocator` with `layout`; on failure
@@ -102,7 +104,7 @@ mod tests {
             panic!("mimalloc realloc failed in allocator smoke test");
         }
 
-        assert!(unsafe { libmimalloc_sys::mi_is_in_heap_region(grown_ptr.cast()) });
+        assert!(unsafe { heap.contains(grown_ptr) });
         // SAFETY: `grown_ptr` was reallocated by `allocator` and is released
         // with the matching grown layout.
         unsafe { allocator.dealloc(grown_ptr, grown_layout) };

rustfs/src/memory_observability.rs

@@ -17,10 +17,7 @@ use rustfs_io_metrics::{
     record_cpu_usage, record_memory_usage, record_process_memory_split,
 };
 use serde::Serialize;
-#[cfg(any(test, not(target_os = "windows")))]
 use serde_json::Value;
-#[cfg(not(target_os = "windows"))]
-use std::ffi::CStr;
 use std::path::Path;
 use std::sync::{Arc, Mutex, OnceLock};
 use std::time::Duration;
@@ -231,7 +228,18 @@ fn read_cgroup_memory_snapshot() -> Option<CgroupMemorySnapshot> {
     read_cgroup_v2().or_else(read_cgroup_v1)
 }
 
-#[cfg(any(test, not(target_os = "windows")))]
+fn read_allocator_memory_snapshot() -> Option<AllocatorMemorySnapshot> {
+    let json = rustfs_mimalloc::MiMalloc::stats_json();
+    if json.is_empty() {
+        return None;
+    }
+    let observation = parse_mimalloc_stats_json(&json)?;
+    Some(AllocatorMemorySnapshot {
+        backend: crate::allocator_reclaim::allocator_backend(),
+        observation,
+    })
+}
+
 fn numeric_json_value(value: &Value) -> Option<u64> {
     match value {
         Value::Number(number) => number
@@ -242,7 +250,6 @@ fn numeric_json_value(value: &Value) -> Option<u64> {
     }
 }
 
-#[cfg(any(test, not(target_os = "windows")))]
 fn numeric_json_field(value: &Value, field: &str) -> Option<u64> {
     match value {
         Value::Object(fields) => fields
@@ -254,7 +261,6 @@ fn numeric_json_field(value: &Value, field: &str) -> Option<u64> {
     }
 }
 
-#[cfg(any(test, not(target_os = "windows")))]
 fn mimalloc_stat_field(value: &Value, metric: &str, field: &str) -> Option<u64> {
     match value {
         Value::Object(fields) => {
@@ -271,12 +277,10 @@ fn mimalloc_stat_field(value: &Value, metric: &str, field: &str) -> Option<u64>
     }
 }
 
-#[cfg(any(test, not(target_os = "windows")))]
 fn mimalloc_stat_current(value: &Value, metric: &str) -> Option<u64> {
     mimalloc_stat_field(value, metric, "current")
 }
 
-#[cfg(any(test, not(target_os = "windows")))]
 fn mimalloc_stat_sum(value: &Value, metrics: &[&str], field: &str) -> Option<u64> {
     metrics
         .iter()
@@ -285,7 +289,6 @@ fn mimalloc_stat_sum(value: &Value, metrics: &[&str], field: &str) -> Option<u64
         .filter(|value| *value > 0)
 }
 
-#[cfg(any(test, not(target_os = "windows")))]
 fn parse_mimalloc_stats_json(stats_json: &str) -> Option<AllocatorMemoryObservation> {
     let value = serde_json::from_str::<Value>(stats_json).ok()?;
     let malloc_metrics = ["malloc_normal", "malloc_huge"];
@@ -312,33 +315,6 @@ fn parse_mimalloc_stats_json(stats_json: &str) -> Option<AllocatorMemoryObservat
     }
 }
 
-#[cfg(not(target_os = "windows"))]
-#[allow(unsafe_code)]
-fn read_allocator_memory_snapshot() -> Option<AllocatorMemorySnapshot> {
-    // SAFETY: `mi_stats_get_json` returns a null-terminated JSON buffer owned by
-    // mimalloc when called with a null input buffer. The mimalloc API requires
-    // freeing that buffer with `mi_free`; parsing finishes before the buffer is freed.
-    let observation = unsafe {
-        let stats_ptr = libmimalloc_sys::mi_stats_get_json(0, std::ptr::null_mut());
-        if stats_ptr.is_null() {
-            return None;
-        }
-
-        let observation = CStr::from_ptr(stats_ptr).to_str().ok().and_then(parse_mimalloc_stats_json);
-        libmimalloc_sys::mi_free(stats_ptr.cast());
-        observation?
-    };
-    Some(AllocatorMemorySnapshot {
-        backend: crate::allocator_reclaim::allocator_backend(),
-        observation,
-    })
-}
-
-#[cfg(target_os = "windows")]
-fn read_allocator_memory_snapshot() -> Option<AllocatorMemorySnapshot> {
-    None
-}
-
 fn configured_memory_observability_interval_secs() -> u64 {
     rustfs_utils::get_env_u64(ENV_MEMORY_OBSERVABILITY_INTERVAL_SECS, DEFAULT_MEMORY_OBSERVABILITY_INTERVAL_SECS).max(1)
 }
@@ -566,6 +542,13 @@ mod tests {
         assert_eq!(parse_mimalloc_stats_json(r#"{ "allocator": "unknown" }"#), None);
     }
 
+    #[test]
+    fn read_allocator_memory_snapshot_uses_mimalloc_stats_json() {
+        let snapshot = super::read_allocator_memory_snapshot();
+        #[cfg(not(target_os = "windows"))]
+        assert!(snapshot.is_some(), "allocator snapshot should be available on non-Windows");
+    }
+
     #[test]
     fn memory_observability_snapshot_reports_disabled_when_metrics_are_disabled() {
         let snapshot = build_memory_observability_status_snapshot(false, 15, false);

scripts/test/vault_ha_kms_live.sh

@@ -241,7 +241,7 @@ env \
   RUSTFS_TEST_VAULT_FAILOVER_MARKER="$MARKER" \
   RUSTFS_TEST_VAULT_OLD_LEADER="$OLD_LEADER" \
   cargo test -p rustfs-kms --test vault_ha_failover_live \
-    vault_raft_leader_failure_preserves_kv2_and_transit_decrypts -- \
+    vault_raft_leader_failure_recovers_kv2_and_transit_decrypts -- \
     --ignored --nocapture --test-threads=1 &
 TEST_PID=$!