Do you have more logs that indicate what state machine event the crashing OSDs received? This obviously shouldn't have happened, but it's a plausible failure mode, especially if it's a relatively rare combination of events.
-Greg
On Fri, Aug 17, 2018 at 4:49 PM Kenneth Van Alstyne <kvanalstyne@xxxxxxxxxxxxxxx> wrote:
Hello all:
I ran into an issue recently with one of my clusters when upgrading from 10.2.10 to 12.2.7. I have previously tested the upgrade in a lab and upgraded one of our five production clusters with no issues. On the second cluster, however, I ran into an issue where all OSDs that were NOT running Luminous yet (which was about 40% of the cluster at the time) all crashed with the same backtrace, which I have pasted below:
===
0> 2018-08-13 17:35:13.160849 7f145c9ec700 -1 osd/PG.cc: In function 'PG::RecoveryState::Crashed::Crashed(boost::statechart::state<PG::RecoveryState::Crashed, PG::RecoveryState::RecoveryMachine>::my_context)' thread 7f145c9ec700 time 2018-08-13 17:35:13.157319
osd/PG.cc: 5860: FAILED assert(0 == "we got a bad state machine event")
ceph version 10.2.10 (5dc1e4c05cb68dbf62ae6fce3f0700e4654fdbbe)
1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x7f) [0x55b9bf08614f]
2: (PG::RecoveryState::Crashed::Crashed(boost::statechart::state<PG::RecoveryState::Crashed, PG::RecoveryState::RecoveryMachine, boost::mpl::list<mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, (boost::statechart::history_mode)0>::my_context)+0xc4) [0x55b9bea62db4]
3: (()+0x447366) [0x55b9bea9a366]
4: (boost::statechart::simple_state<PG::RecoveryState::Stray, PG::RecoveryState::Started, boost::mpl::list<mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, (boost::statechart::history_mode)0>::react_impl(boost::statechart::event_base const&, void const*)+0x2f7) [0x55b9beac8b77]
5: (boost::statechart::state_machine<PG::RecoveryState::RecoveryMachine, PG::RecoveryState::Initial, std::allocator<void>, boost::statechart::null_exception_translator>::process_event(boost::statechart::event_base const&)+0x6b) [0x55b9beaab5bb]
6: (PG::handle_peering_event(std::shared_ptr<PG::CephPeeringEvt>, PG::RecoveryCtx*)+0x384) [0x55b9bea7db14]
7: (OSD::process_peering_events(std::__cxx11::list<PG*, std::allocator<PG*> > const&, ThreadPool::TPHandle&)+0x263) [0x55b9be9d1723]
8: (ThreadPool::BatchWorkQueue<PG>::_void_process(void*, ThreadPool::TPHandle&)+0x2a) [0x55b9bea1274a]
9: (ThreadPool::worker(ThreadPool::WorkThread*)+0xeb0) [0x55b9bf076d40]
10: (ThreadPool::WorkThread::entry()+0x10) [0x55b9bf077ef0]
11: (()+0x7507) [0x7f14e2c96507]
12: (clone()+0x3f) [0x7f14e0ca214f]
NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.
===
Once I restarted the impacted OSDs, which brought them up to 12.2.7, everything recovered just fine and the cluster is healthy. The only rub is that losing that many OSDs simultaneously caused a significant I/O disruption to the production servers for several minutes while I brought up the remaining OSDs. I have been trying to duplicate this issue in a lab again before continuing the upgrades on the other three clusters, but am coming up short. Has anyone seen anything like this and am I missing something obvious?
Given how quickly the issue happened and the fact that I’m having a hard time reproducing this issue, I am limited in the amount of logging and debug information I have available, unfortunately. If it helps, all ceph-mon, ceph-mds, radosgw, and ceph-mgr daemons were running 12.2.7, while 30 of the 50 total ceph-osd daemons were also on 12.2.7 when the remaining 20 ceph-osd daemons (on 10.2.10) crashed.
Thanks,
--
Kenneth Van Alstyne
Systems Architect
Knight Point Systems, LLC
Service-Disabled Veteran-Owned Business
1775 Wiehle Avenue Suite 101 | Reston, VA 20190
c: 228-547-8045 f: 571-266-3106
www.knightpoint.com
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