[Bug 1898200] Re: [SRU] ceph 15.2.5

[Mohammed Naser]

This is pretty critical for us, the problem is that we are seeing VMs
crash with the following error:

Oct 24 15:55:19 kvm3 kernel: [1972520.039122] tp_librbd[65017]: segfault at 3f21 ip 00007f5ea8796266 sp 00007f5e82ffc500 error 4 in librbd.so.1.12.0[7f5ea85b7000+5a3000]
Oct 25 12:20:24 kvm3 kernel: [2046023.073585] fn-radosclient[59082]: segfault at 14ea9a ip 00007facfa108266 sp 00007facd17f9470 error 4 in librbd.so.1.12.0[7facf9f29000+5a3000]
Oct 31 11:25:29 kvm7 kernel: [3411178.435755] fn-radosclient[5460]: segfault at 3f21 ip 00007fbc686afe26 sp 00007fbc297f9470 error 4 in librbd.so.1.12.0[7fbc684d1000+5a0000]
Nov  2 11:57:34 kvm7 kernel: [3585900.195308] fn-radosclient[15921]: segfault at 3f21 ip 00007f76fa4a9e26 sp 00007f76af7fd470 error 4 in librbd.so.1.12.0[7f76fa2cb000+5a0000]

Upon researching this, this lead me to the following bug:

https://tracker.ceph.com/issues/47456

Which was closed by the following PR:

https://github.com/ceph/ceph/pull/36331

Which has been included as per the release notes:

https://docs.ceph.com/en/latest/releases/octopus/
"rbd: librbd: potential race conditions handling API IO completions (pr#36331, Jason Dillaman)"

** Bug watch added: tracker.ceph.com/issues #47456
   http://tracker.ceph.com/issues/47456

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https://bugs.launchpad.net/bugs/1898200

Title:
  [SRU] ceph 15.2.5

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive ussuri series:
  In Progress
Status in Ubuntu Cloud Archive victoria series:
  Invalid
Status in ceph package in Ubuntu:
  Fix Released
Status in ceph source package in Focal:
  In Progress
Status in ceph source package in Groovy:
  Fix Released

Bug description:
  
  [Impact]
  This release sports mostly bug-fixes but also some security fixes and we would like to make sure all of our supported customers have access to these improvements.

  The update contains the following package updates:

     * ceph 15.2.5

  [Test Case]
  The following SRU process was followed:

  https://wiki.ubuntu.com/OpenStackUpdates

  In order to avoid regression of existing consumers, the OpenStack team
  will run their continuous integration test against the packages that
  are in -proposed. A successful run of all available tests will be
  required before the proposed packages can be let into -updates.

  The OpenStack team will be in charge of attaching the output summary
  of the executed tests. The OpenStack team members will not mark
  ‘verification-done’ until this has happened.

  [Regression Potential]
  In order to mitigate the regression potential, the results of the
  aforementioned tests are attached to this bug.

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