pptx704 88246fac2b Fix sandbox lifecycle cleanup and dmsetup remove reliability ...

- Add retry with backoff to dmsetupRemove for transient "device busy"
  errors caused by kernel not releasing the device immediately after
  Firecracker exits. Only retries on "Device or resource busy"; other
  errors (not found, permission denied) return immediately.

- Thread context.Context through RemoveSnapshot/RestoreSnapshot so
  retries respect cancellation. Use context.Background() in all error
  cleanup paths to prevent cancelled contexts from skipping cleanup
  and leaking dm devices on the host.

- Resume vCPUs on pause failure: if snapshot creation or memfile
  processing fails after freezing the VM, unfreeze vCPUs so the
  sandbox stays usable instead of becoming a frozen zombie.

- Fix resource leaks in Pause when CoW rename or metadata write fails:
  properly clean up network, slot, loop device, and remove from boxes
  map instead of leaving a dead sandbox with leaked host resources.

- Fix Resume WaitUntilReady failure: roll back CoW file to the snapshot
  directory instead of deleting it, preserving the paused state so the
  user can retry.

- Skip m.loops.Release when RemoveSnapshot fails during pause since
  the stale dm device still references the origin loop device.

- Fix incorrect VCPUs placeholder in Resume VMConfig that used memory
  size instead of a sensible default.

2026-03-14 06:42:34 +06:00

..

manager.go

Fix sandbox lifecycle cleanup and dmsetup remove reliability

2026-03-14 06:42:34 +06:00