The server installer downloaded the release archive and extracted it
under /tmp. Debian 13 and many LXC templates mount /tmp as tmpfs, whose
pages are charged to the container's memory cgroup. A v6.5.0 archive is
~280 MB and extracts to ~750 MB, so an unattended update on a 1 GiB LXC
filled the cgroup with ~820 MB of shmem; the kernel OOM-killed the
container's systemd and Proxmox stopped the container mid-update.
Download and extract into owner-only hidden directories under the
install directory instead. It is always writable from the hardened
pulse-update.service sandbox, it is where the staged binary already
lives, and the disk headroom preflight now measures the filesystem the
update actually stages on. The Go updater already prefers its data
directory over /tmp for the same reason.
Unlike /tmp, the install filesystem keeps an interrupted run's staging
across reboots. Staging setup now removes stale staging directories that
match only the exact owner-only names, never symlinks or files, and only
once their ctime is over six hours old: install.sh has no update lock,
so age is what proves no live run still owns them. Every recursive
pulse chown of the install directory now goes through one helper that
skips staging, so the payload root still reads is never handed to the
service account and the ~750 MB tree is not rewritten for nothing.
The "Failed to print table: Broken pipe" line in the report was
systemctl list-unit-files | grep -q in v6.5.0's service discovery; main
already reads that inventory in full, and it was not the failure.
Contract-Neutral: Defect fix inside the existing private server-installer inputs and update-space boundaries; staging moves from tmpfs-prone /tmp to the install filesystem with no public contract change
Keep archive and sidecar downloads in owner-only staging, clean only owned leaves after handled failures and bootstrap exit, and preserve caller-provided inputs. Require the piped LXC installer signature before copying or execution instead of trusting PID-named files in shared tmp.
Exercise the actual download, prefetch and complete container bootstrap through confined offline doubles and real fixture SSH signatures. Preserve version, archive re-verification, staging-before-stop, service recovery, timer consent and removal boundaries; native acceptance remains separate.
Change-source: pulse-maintainer
rcourtman