[Bug 2121931] Re: OSD crash in OSD::tick_without_osd_lock() due to race condition

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: ceph (Ubuntu Noble)
       Status: New => Confirmed

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Title:
  OSD crash in OSD::tick_without_osd_lock() due to race condition

Status in ceph package in Ubuntu:
  Confirmed
Status in ceph source package in Noble:
  Confirmed
Status in ceph source package in Plucky:
  Confirmed
Status in ceph source package in Questing:
  Confirmed

Bug description:
  OSDs access and modify epoch maps without a lock from multiple
  threads. This leads a race condition and results in a crash due to
  iterator invalidation.

  Typical stack trace looks like:

  Jul 05 01:34:19 ps7-ra1-n1 ceph-osd[2083916]: *** Caught signal (Segmentation fault) **
  Jul 05 01:34:19 ps7-ra1-n1 ceph-osd[2083916]:  in thread 7e821b800640 thread_name:safe_timer
  Jul 05 01:34:19 ps7-ra1-n1 ceph-osd[2083916]:  ceph version 19.2.0 (16063ff2022298c9300e49a547a16ffda59baf13) squid (stable)
  Jul 05 01:34:19 ps7-ra1-n1 ceph-osd[2083916]:  1: /lib/x86_64-linux-gnu/libc.so.6(+0x42520) [0x7e8226442520]
  Jul 05 01:34:19 ps7-ra1-n1 ceph-osd[2083916]:  2: (std::_Rb_tree_decrement(std::_Rb_tree_node_base const*)+0xe) [0x7e82268c65ee]
  Jul 05 01:34:19 ps7-ra1-n1 ceph-osd[2083916]:  3: (OSD::tick_without_osd_lock()+0x4ac) [0x5e326eb66c6c]
  Jul 05 01:34:19 ps7-ra1-n1 ceph-osd[2083916]:  4: (Context::complete(int)+0xd) [0x5e326eb8971d]
  Jul 05 01:34:19 ps7-ra1-n1 ceph-osd[2083916]:  5: (CommonSafeTimer<std::mutex>::timer_thread()+0x12d) [0x5e326f1f64ed]
  Jul 05 01:34:19 ps7-ra1-n1 ceph-osd[2083916]:  6: (CommonSafeTimerThread<std::mutex>::entry()+0x11) [0x5e326f1f7991]
  Jul 05 01:34:19 ps7-ra1-n1 ceph-osd[2083916]:  7: /lib/x86_64-linux-gnu/libc.so.6(+0x94ac3) [0x7e8226494ac3]
  Jul 05 01:34:19 ps7-ra1-n1 ceph-osd[2083916]:  8: /lib/x86_64-linux-gnu/libc.so.6(+0x126850) [0x7e8226526850]
  Jul 05 01:34:19 ps7-ra1-n1 ceph-osd[2083916]: 2025-07-05T01:34:19.417+0000 7e821b800640 -1 *** Caught signal (Segmentation fault) **
  Jul 05 01:34:19 ps7-ra1-n1 ceph-osd[2083916]:  in thread 7e821b800640 thread_name:safe_timer

  This has been fixed in upstream and backport to Squid is in progress.

  Upstream bug trcker: https://tracker.ceph.com/issues/66819
  Upstream patch: https://github.com/ceph/ceph/pull/62916
  Bug tracker for Squid: https://tracker.ceph.com/issues/72070
  Backport patch for Squid: https://github.com/ceph/ceph/pull/64732

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