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

[gerald.yang]

Public bug reported:

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

[Test case]


[Regression potential]
low, hold sufficient locks and decrement l_msgr_active_connections shouldn't cause any regressions

[Additional information] 
from upstream:

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

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

** Affects: ceph (Ubuntu)
     Importance: Undecided
     Assignee: gerald.yang (gerald-yang-tw)
         Status: In Progress

** Changed in: ceph (Ubuntu)
     Assignee: (unassigned) => gerald.yang (gerald-yang-tw)

** Changed in: ceph (Ubuntu)
       Status: New => In Progress

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

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

Status in ceph package in Ubuntu:
  In Progress

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

  [Test case]

  
  [Regression potential]
  low, hold sufficient locks and decrement l_msgr_active_connections shouldn't cause any regressions

  [Additional information] 
  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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