[Bug 1917494] Re: ceph-mgr hangs in large clusters

[Ponnuvel Palaniyappan]

This has been merged upstream master and backported to Octopus [0].
Octopus release 15.2.9 contains the fix.

Proposed the backport for Nautilus:
https://github.com/ceph/ceph/pull/40047


[0] https://github.com/ceph/ceph/pull/38801

** Changed in: ceph (Ubuntu)
   Importance: Undecided => High

** Changed in: ceph (Ubuntu)
     Assignee: (unassigned) => Ponnuvel Palaniyappan (pponnuvel)

** Tags added: sts

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Title:
  ceph-mgr hangs in large clusters

Status in ceph package in Ubuntu:
  New

Bug description:
  This is to track and SRU the upstream bug [0]. In large clusers,
  there's a GIL deadlock that happens (or observable) when ceph-mgr
  receive high number of requests from Prometheus module.

  This bug likely exists at least since the initial release of Nautilus.

  Upstream fixed this recently [2]. Targetted for Octopus 15.2.9 (which
  is not released yet - the next point release). So this tracker is to
  assess the impact and potentially backport in Ubuntu/UCA packages
  before 15.2.9 gets released.


  N.B: We have previously backported a similar bug [1]. But this is
  unrelated.

  [0] https://tracker.ceph.com/issues/39264
  [1] https://bugs.launchpad.net/ubuntu/+source/ceph/+bug/1906496
  [2] https://github.com/ceph/ceph/pull/38677

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