[Bug 1891567] Re: [SRU] ceph_osd crash in _committed_osd_maps when failed to encode first inc map

[Corey Bryant]

ceph 15.2.3-0ubuntu2 is uploaded to groovy and ceph
15.2.3-0ubuntu0.20.04.2 has been uploaded to the focal unapproved queue
[1] to fix this bug.

[1]
https://launchpad.net/ubuntu/focal/+queue?queue_state=1&queue_text=ceph

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https://bugs.launchpad.net/bugs/1891567

Title:
  [SRU] ceph_osd crash in _committed_osd_maps when failed to encode
  first inc map

Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive ussuri series:
  Triaged
Status in Ubuntu Cloud Archive victoria series:
  Triaged
Status in ceph package in Ubuntu:
  Triaged
Status in ceph source package in Focal:
  Triaged
Status in ceph source package in Groovy:
  Triaged

Bug description:
  [Impact]
  Upstream tracker: issue#46443 [0].

  The ceph-osd service can crash when processing osd map updates.

  When the osd encounters a CRC error while processing an incremental
  map update, it will request a full map update from its peers. In this
  code path, an uninitialized variable was recently introduced and that
  will get de-referenced causing a crash.

  The uninitialized variable was introduced in nautilus 14.2.10, and
  octopus 15.2.1.

  [Test Case]
  # Inject osd_inject_bad_map_crc_probability = 1
  sudo ceph daemon osd.{id} config set osd_inject_bad_map_crc_probability 1

  # Trigger some osd map updates by restarting a different osd
  sudo systemctl restart osd@{diff-id}

  [Other Info]
  Upstream has released a fix for this issue in Nautilus 14.2.11. The SRU for this point release is being tracked by LP: #1891077

  Upstream has merged a fix for this issue in Octopus [1], but there is
  no current release target. The ceph packages in focal, groovy, and the
  ussuri cloud archive are exposed to this critical regression.

  [0] https://tracker.ceph.com/issues/46443
  [1] https://github.com/ceph/ceph/pull/36340

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