[Bug 2089565] Re: MON and MDS crash upgrading CEPH on ubuntu 24.04 LTS

[Maksym Medvied]

The following patch was used to get the hexdumps above:

diff --git a/src/mon/MDSMonitor.cc b/src/mon/MDSMonitor.cc
index 76a57ac443..d36bed2257 100644
--- a/src/mon/MDSMonitor.cc
+++ b/src/mon/MDSMonitor.cc
@@ -143,6 +143,7 @@ void MDSMonitor::update_from_paxos(bool *need_bootstrap)

   ceph_assert(fsmap_bl.length() > 0);
   dout(10) << __func__ << " got " << version << dendl;
+  fsmap_bl.hexdump(std::cout);
   try {
     PaxosFSMap::decode(fsmap_bl);
   } catch (const ceph::buffer::malformed_input& e) {

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Title:
  MON and MDS crash upgrading  CEPH  on ubuntu 24.04 LTS

Status in ceph package in Ubuntu:
  In Progress

Bug description:
  This issue is a continuation of
  https://bugs.launchpad.net/ubuntu/+source/ceph/+bug/2065515

  
  On Ubuntu 24.04 lts we did upgrade Ceph to  19.2.0-0ubuntu0.24.04.1

  Previous release is : 19.2.0~git20240301.4c76c50-0ubuntu6

  whenever  upgrading (tested on 2 different clusters)  the ceph-mon
  ends up crashing repeatedly with the below stack error

  ```
   ceph version 19.2.0 (16063ff2022298c9300e49a547a16ffda59baf13) squid (stable)
   1: /lib/x86_64-linux-gnu/libc.so.6(+0x45320) [0x788409245320]
   2: pthread_kill()
   3: gsignal()
   4: abort()
   5: /lib/x86_64-linux-gnu/libstdc++.so.6(+0xa5ff5) [0x7884096a5ff5]
   6: /lib/x86_64-linux-gnu/libstdc++.so.6(+0xbb0da) [0x7884096bb0da]
   7: (std::unexpected()+0) [0x7884096a5a55]
   8: /lib/x86_64-linux-gnu/libstdc++.so.6(+0xbb391) [0x7884096bb391]
   9: (ceph::buffer::v15_2_0::list::iterator_impl<true>::copy(unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&)+0x193) [0x78840a293593]
   10: (MDSMap::decode(ceph::buffer::v15_2_0::list::iterator_impl<true>&)+0xca1) [0x78840a4c3ab1]
   11: (Filesystem::decode(ceph::buffer::v15_2_0::list::iterator_impl<true>&)+0x1c3) [0x78840a4e4303]
   12: (FSMap::decode(ceph::buffer::v15_2_0::list::iterator_impl<true>&)+0x280) [0x78840a4e6ef0]
   13: (MDSMonitor::update_from_paxos(bool*)+0x291) [0x631ac5dea801]
   14: (Monitor::refresh_from_paxos(bool*)+0x124) [0x631ac5b7a164]
   15: (Monitor::preinit()+0x98e) [0x631ac5bb2fbe]
   16: main()
   17: /lib/x86_64-linux-gnu/libc.so.6(+0x2a1ca) [0x78840922a1ca]
   18: __libc_start_main()
   19: _start()
   NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.

  ```

  
  mitigation:
  a rollback to the previous release 19.2.0~git20240301.4c76c50-0ubuntu6 is still possible to restore service

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