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joshsiv-mulga
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TestNPassOverwrite detaches after every pass, so viperblock's drain and GC only ever run at reopen — it cannot show whether GC reclaims superseded chunks while a volume stays open, and its serial write rate never nears the predastore rate limiter's burst. TestContinuousChurn attaches once and drives concurrent 4 MiB-aligned raw overwrites of per-writer regions for several minutes without detaching, so a sustained superseded-chunk backlog builds under one long open, spanning multiple GC ticks. The workload is bounded and self-contained: each dd writes one chunk and the clock is re-checked after every write, the loop runs as root under a single sudo bash with a process-group kill trap, and it is wrapped in a guest-side timeout. Root ownership is load-bearing — the writers open a raw device, so only a root-owned process group can reap them; a best-effort guest pkill runs before detach as a backstop so a stray writer cannot wedge the detach.