Ceph

version: 0.80.7

config:
osd max backfills = 1
osd recovery max active = 1

One osd went down after hitting the following failed assertion

2014-12-04 12:42:42.699457 7f5bdc28b700 -1 osd/PG.cc: In function 'bool PG::choose_acting(pg_shard_t&)' thread 7f5bdc28b700 time 2014-12-04 12:42:42.545712
osd/PG.cc: 1327: FAILED assert(backfill_targets.empty() || backfill_targets == want_backfill)

ceph version 0.80.7 (6c0127fcb58008793d3c8b62d925bc91963672a3)
 1: (PG::choose_acting(pg_shard_t&)+0x1380) [0x774380]
 2: (PG::RecoveryState::Recovered::Recovered(boost::statechart::state<PG::RecoveryState::Recovered, PG::RecoveryState::Active, 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)+0x269) [0x7974a9]
 3: (boost::statechart::state<PG::RecoveryState::Recovered, PG::RecoveryState::Active, 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>::shallow_construct(boost::intrusive_ptr<PG::RecoveryState::Active> const&, boost::statechart::state_machine<PG::RecoveryState::RecoveryMachine, PG::RecoveryState::Initial, std::allocator<void>, boost::statechart::null_exception_translator>&)+0x5c) [0x7b98cc]
 4: (boost::statechart::detail::safe_reaction_result boost::statechart::simple_state<PG::RecoveryState::Backfilling, PG::RecoveryState::Active, 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>::transit_impl<PG::RecoveryState::Recovered, PG::RecoveryState::RecoveryMachine, boost::statechart::detail::no_transition_function>(boost::statechart::detail::no_transition_function const&)+0x88) [0x7c1368]
 5: (boost::statechart::simple_state<PG::RecoveryState::Backfilling, PG::RecoveryState::Active, 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*)+0xc8) [0x7c14d8]
 6: (boost::statechart::state_machine<PG::RecoveryState::RecoveryMachine, PG::RecoveryState::Initial, std::allocator<void>, boost::statechart::null_exception_translator>::send_event(boost::statechart::event_base const&)+0x5b) [0x7a4d6b]
 7: (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&)+0x11) [0x7a50c1]
 8: (PG::handle_peering_event(std::tr1::shared_ptr<PG::CephPeeringEvt>, PG::RecoveryCtx*)+0x303) [0x75b633]
 9: (OSD::process_peering_events(std::list<PG*, std::allocator<PG*> > const&, ThreadPool::TPHandle&)+0x2ce) [0x66713e]
 10: (OSD::PeeringWQ::_process(std::list<PG*, std::allocator<PG*> > const&, ThreadPool::TPHandle&)+0x12) [0x6b6472]
 11: (ThreadPool::worker(ThreadPool::WorkThread*)+0x4e6) [0xa9b036]
 12: (ThreadPool::WorkThread::entry()+0x10) [0xa9d050]
 13: (()+0x7e9a) [0x7f5bf54dde9a]
 14: (clone()+0x6d) [0x7f5bf3ceb3fd]
 NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.