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shim: report sandbox exits before successful start - #17634
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A root sandbox already exists after Create, but the shim only starts its normal waiter after a successful Start. If Start fails or is never called, host death can leave Wait and containerd force-delete without completion. Transfer a creator-owned pidfd to the shim and observe it until Start or Restore succeeds. Preserve the normal guest waiter, OOM event ordering and delete completion across retries. Clean up a root when post-create observer setup fails. The standalone-root classification prerequisite also appears in google#17519. Assisted-by: Codex
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A root sandbox already exists after
Create, but the shim only starts waiting for its exit after a successfulStart. If the sandbox dies before that transition,Waitnever completes and containerd force-delete can hang.Track that process using a pidfd passed by its creator. After a successful
StartorRestore, keep using the existing runsc waiter and guest exit status.Changes
Tested
The standalone-root classification hunk overlaps #17519; that PR handles the separate startup-delay and stdio bug.
Validation revisions and startup measurements
Component tests:
ac451b2. Native and workload checks:5b4c2ee, combining this change with the separate process-name/Unlock follow-up, on baseddb2d202.Annotated-root startup measurements used
4d7dc1d, before the final rollback correction:The initial small difference was not reproduced in the randomized control. These results do not establish zero overhead.