[Bug 1953431] Re: [SRU] fix unsafe access in unregister_conn()

[gerald.yang]

Hello @mywh

The fix is merged into 15.2.16 which is currently in focal-proposed for testing
if there is no regression, it will be published to focal-updates soon

If you would like to run some tests to confirm the issue you are hitting has been fixed
please enable focal-proposed and install 15.2.16 from there

Thanks
Gerald

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https://bugs.launchpad.net/bugs/1953431

Title:
  [SRU] fix unsafe access in unregister_conn()

Status in ceph package in Ubuntu:
  Won't Fix
Status in ceph source package in Focal:
  Won't Fix

Bug description:
  [Impact]
  without holding sufficient locks, accept_conn and shutdown_connections in AsyncMessenger could cause OSD processes crash

  [Test plan]
  run ceph_test_async_networkstack repeatedly, this will trigger many async messenger events and make sure
  1. OSD process not crash
  2. no deadlock

  [Where problems could occur]
  hold sufficient locks and decrement l_msgr_active_connections can avoid OSD processes to crash due to race condition
  The only problem I can imagine is deadlock if one process is holding lock A and wait for lock B, the there is another process holding lock B and wait for lock A

  [Other info]
  from upstream:

  octopus backport tracker
  https://tracker.ceph.com/issues/50482

  octopus backport PR
  https://github.com/ceph/ceph/pull/43325

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