[Bug 1874939] Re: ceph-osd can't connect after upgrade to focal

James Page 1874939 at bugs.launchpad.net
Fri May 22 04:59:24 UTC 2020 

As a side note - even if there is a bug here (and it sounds like there
might be) I would recommend placing the mon and mgr daemons in LXD
containers ontop of the machines hosting the osd's - this will allow you
to manage them independently from an upgrade process for both ceph
upgrades and ubuntu release upgrades.

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https://bugs.launchpad.net/bugs/1874939

Title:
  ceph-osd can't connect after upgrade to focal

Status in ceph package in Ubuntu:
  In Progress

Bug description:
  Upon upgrading a Ceph node with do-release-upgrade from eoan to focal,
  the OSD doesn't connect after the upgrade. I rolled back the change
  (VBox snapshot) and tried again, same result. I also tried to hold
  back the Ceph packages and upgrade after the fact, but again same
  result.

  Epected behavior: OSD connects to cluster after upgrade.

  Actual behavior: OSD log shows endlessly repeated
  'tick_without_osd_lock' messages. OSD will stay down from perspective
  of the cluster.

  Extract from debug log of OSD:

  2020-04-24T16:25:35.811-0700 7fd70e83d700  5 osd.0 16499 heartbeat osd_stat(store_statfs(0x44990000/0x40000000/0x240000000, data 0x14bb97877/0x1bb660000, compress 0x0/0x0/0x0, omap 0x2bbf, meta 0x3fffd441), peers [] op hist [])
  2020-04-24T16:25:35.811-0700 7fd70e83d700 20 osd.0 16499 check_full_status cur ratio 0.769796, physical ratio 0.769796, new state none
  2020-04-24T16:25:36.043-0700 7fd7272ea700 10 osd.0 16499 tick
  2020-04-24T16:25:36.043-0700 7fd7272ea700 10 osd.0 16499 do_waiters -- start
  2020-04-24T16:25:36.043-0700 7fd7272ea700 10 osd.0 16499 do_waiters -- finish
  2020-04-24T16:25:36.043-0700 7fd7272ea700 20 osd.0 16499 tick last_purged_snaps_scrub 2020-04-24T15:54:43.601161-0700 next 2020-04-25T15:54:43.601161-0700
  2020-04-24T16:25:36.631-0700 7fd72606c700 10 osd.0 16499 tick_without_osd_lock
  2020-04-24T16:25:37.055-0700 7fd7272ea700 10 osd.0 16499 tick
  2020-04-24T16:25:37.055-0700 7fd7272ea700 10 osd.0 16499 do_waiters -- start
  2020-04-24T16:25:37.055-0700 7fd7272ea700 10 osd.0 16499 do_waiters -- finish
  2020-04-24T16:25:37.055-0700 7fd7272ea700 20 osd.0 16499 tick last_purged_snaps_scrub 2020-04-24T15:54:43.601161-0700 next 2020-04-25T15:54:43.601161-0700
  2020-04-24T16:25:37.595-0700 7fd72606c700 10 osd.0 16499 tick_without_osd_lock
  2020-04-24T16:25:38.071-0700 7fd7272ea700 10 osd.0 16499 tick
  2020-04-24T16:25:38.071-0700 7fd7272ea700 10 osd.0 16499 do_waiters -- start
  2020-04-24T16:25:38.071-0700 7fd7272ea700 10 osd.0 16499 do_waiters -- finish
  2020-04-24T16:25:38.071-0700 7fd7272ea700 20 osd.0 16499 tick last_purged_snaps_scrub 2020-04-24T15:54:43.601161-0700 next 2020-04-25T15:54:43.601161-0700
  2020-04-24T16:25:38.243-0700 7fd71cc0d700 20 osd.0 16499 reports for 0 queries
  2020-04-24T16:25:38.583-0700 7fd72606c700 10 osd.0 16499 tick_without_osd_lock
  2020-04-24T16:25:39.103-0700 7fd7272ea700 10 osd.0 16499 tick
  2020-04-24T16:25:39.103-0700 7fd7272ea700 10 osd.0 16499 do_waiters -- start
  2020-04-24T16:25:39.103-0700 7fd7272ea700 10 osd.0 16499 do_waiters -- finish
  2020-04-24T16:25:39.103-0700 7fd7272ea700 20 osd.0 16499 tick last_purged_snaps_scrub 2020-04-24T15:54:43.601161-0700 next 2020-04-25T15:54:43.601161-0700

  This repeats over and over again.

  strace of the process yields lots of unfinished futex access attempts:

  [pid  2130] futex(0x55b17b8e216c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, {tv_sec=1587772054, tv_nsec=937726129}, FUTEX_BITSET_MATCH_ANY <unfinished ...>
  [pid  2100] write(12, "2020-04-24T16:47:33.915-0700 7fd"..., 79) = 79
  [pid  2100] futex(0x55b17b7108e4, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
  [pid  2190] <... futex resumed> )       = -1 ETIMEDOUT (Connection timed out)
  [pid  2190] futex(0x55b17b775ac0, FUTEX_WAKE_PRIVATE, 1) = 0
  [pid  2190] futex(0x55b17b775ab8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, {tv_sec=1587772053, tv_nsec=969572004}, FUTEX_BITSET_MATCH_ANY) = -1 ETIMEDOUT (Connection timed out)
  [pid  2190] futex(0x55b17b775ac0, FUTEX_WAKE_PRIVATE, 1) = 0
  [pid  2190] futex(0x55b17b775ab8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, {tv_sec=1587772054, tv_nsec=20189832}, FUTEX_BITSET_MATCH_ANY) = -1 ETIMEDOUT (Connection timed out)
  [pid  2190] futex(0x55b17b775ac0, FUTEX_WAKE_PRIVATE, 1) = 0
  [pid  2190] futex(0x55b17b775ab8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, {tv_sec=1587772054, tv_nsec=70811223}, FUTEX_BITSET_MATCH_ANY <unfinished ...>
  [pid  2163] <... io_getevents resumed> [], {tv_sec=0, tv_nsec=250000000}) = 0
  [pid  2134] <... io_getevents resumed> [], {tv_sec=0, tv_nsec=250000000}) = 0
  [pid  2163] io_getevents(0x7fd7272eb000, 1, 16,  <unfinished ...>
  [pid  2134] io_getevents(0x7fd7272fc000, 1, 16,  <unfinished ...>
  [pid  2190] <... futex resumed> )       = -1 ETIMEDOUT (Connection timed out)
  [pid  2190] futex(0x55b17b775ac0, FUTEX_WAKE_PRIVATE, 1) = 0
  [pid  2190] futex(0x55b17b775ab8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, {tv_sec=1587772054, tv_nsec=121288477}, FUTEX_BITSET_MATCH_ANY <unfinished ...>
  [pid  2200] <... futex resumed> )       = -1 ETIMEDOUT (Connection timed out)
  [pid  2200] futex(0x55b17b7108e4, FUTEX_WAKE_PRIVATE, 2147483647) = 1
  [pid  2200] futex(0x7ffc4aa8b708, FUTEX_WAKE_PRIVATE, 1) = 0
  [pid  2200] futex(0x7ffc4aa8b770, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, {tv_sec=1587772055, tv_nsec=102644954}, FUTEX_BITSET_MATCH_ANY <unfinished ...>
  [pid  2100] <... futex resumed> )       = 0
  [pid  2100] futex(0x55b17b710838, FUTEX_WAKE_PRIVATE, 1) = 0
  [pid  2100] futex(0x55b17b7108e0, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
  [pid  2190] <... futex resumed> )       = -1 ETIMEDOUT (Connection timed out)
  [pid  2190] futex(0x55b17b775ac0, FUTEX_WAKE_PRIVATE, 1) = 0
  [pid  2190] futex(0x55b17b775ab8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, {tv_sec=1587772054, tv_nsec=171906673}, FUTEX_BITSET_MATCH_ANY <unfinished ...>
  [pid  2127] <... clock_nanosleep resumed> NULL) = 0
  [pid  2127] clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=0, tv_nsec=256000000},  <unfinished ...>
  [pid  2190] <... futex resumed> )       = -1 ETIMEDOUT (Connection timed out)
  [pid  2190] futex(0x55b17b775ac0, FUTEX_WAKE_PRIVATE, 1) = 0
  [pid  2190] futex(0x55b17b775ab8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, {tv_sec=1587772054, tv_nsec=222271211}, FUTEX_BITSET_MATCH_ANY) = -1 ETIMEDOUT (Connection timed out)
  [pid  2190] futex(0x55b17b775ac0, FUTEX_WAKE_PRIVATE, 1) = 0
  [pid  2190] futex(0x55b17b775ab8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, {tv_sec=1587772054, tv_nsec=273226419}, FUTEX_BITSET_MATCH_ANY) = -1 ETIMEDOUT (Connection timed out)
  [pid  2190] futex(0x55b17b775ac0, FUTEX_WAKE_PRIVATE, 1) = 0
  [pid  2190] futex(0x55b17b775ab8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, {tv_sec=1587772054, tv_nsec=323615391}, FUTEX_BITSET_MATCH_ANY <unfinished ...>
  [pid  2163] <... io_getevents resumed> [], {tv_sec=0, tv_nsec=250000000}) = 0
  [pid  2163] io_getevents(0x7fd7272eb000, 1, 16,  <unfinished ...>
  [pid  2134] <... io_getevents resumed> [], {tv_sec=0, tv_nsec=250000000}) = 0
  [pid  2134] io_getevents(0x7fd7272fc000, 1, 16,  <unfinished ...>
  [pid  2190] <... futex resumed> )       = -1 ETIMEDOUT (Connection timed out)
  [pid  2190] futex(0x55b17b775ac0, FUTEX_WAKE_PRIVATE, 1) = 0
  [pid  2190] futex(0x55b17b775ab8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, {tv_sec=1587772054, tv_nsec=373946132}, FUTEX_BITSET_MATCH_ANY) = -1 ETIMEDOUT (Connection timed out)
  [pid  2190] futex(0x55b17b775ac0, FUTEX_WAKE_PRIVATE, 1) = 0
  [pid  2190] futex(0x55b17b775ab8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, {tv_sec=1587772054, tv_nsec=424283527}, FUTEX_BITSET_MATCH_ANY <unfinished ...>
  [pid  2127] <... clock_nanosleep resumed> NULL) = 0
  [pid  2127] clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=0, tv_nsec=256000000},  <unfinished ...>
  [pid  2190] <... futex resumed> )       = -1 ETIMEDOUT (Connection timed out)
  [pid  2190] futex(0x55b17b775ac0, FUTEX_WAKE_PRIVATE, 1) = 0
  [pid  2190] futex(0x55b17b775ab8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, {tv_sec=1587772054, tv_nsec=474599677}, FUTEX_BITSET_MATCH_ANY) = -1 ETIMEDOUT (Connection timed out)
  [pid  2190] futex(0x55b17b775ac0, FUTEX_WAKE_PRIVATE, 1) = 0
  [pid  2190] futex(0x55b17b775ab8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, {tv_sec=1587772054, tv_nsec=525368586}, FUTEX_BITSET_MATCH_ANY) = -1 ETIMEDOUT (Connection timed out)
  [pid  2190] futex(0x55b17b775ac0, FUTEX_WAKE_PRIVATE, 1) = 0
  [pid  2190] futex(0x55b17b775ab8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, {tv_sec=1587772054, tv_nsec=575839547}, FUTEX_BITSET_MATCH_ANY <unfinished ...>
  [pid  2163] <... io_getevents resumed> [], {tv_sec=0, tv_nsec=250000000}) = 0
  [pid  2134] <... io_getevents resumed> [], {tv_sec=0, tv_nsec=250000000}) = 0
  [pid  2163] io_getevents(0x7fd7272eb000, 1, 16,  <unfinished ...>
  [pid  2134] io_getevents(0x7fd7272fc000, 1, 16, ^Cstrace: Process 2093 detached


  
  Suspected cause: OSD can not connect to monitor. 

  Repeatability: On 5 attempts (3 separate nodes and 2 repetitions) the
  result was the same.

  Research done: I checked Launchpad and the Ceph bug tracker, couldn't
  find something similar. Tried restart of process, reboot of node,
  revert change and re-upgrade, hold Ceph packages and manually upgrade
  after do-release-upgrade, strace of the process.

  Impact: Right now upgrade of Ceph to 20.04 LTS appears to be broken

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ceph-osd 15.2.1-0ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Fri Apr 24 16:30:53 2020
  ProcEnviron:
   SHELL=/bin/bash
   LANG=en_US.UTF-8
   TERM=xterm-256color
   PATH=(custom, no user)
  SourcePackage: ceph
  UpgradeStatus: Upgraded to focal on 2020-04-24 (0 days ago)

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