Issue

• Ceph - OSD assert with /include/interval_set.h: 386: FAILED assert(_size >= 0)

0> 2016-11-29 04:09:15.149619 7fe52ddbe700 -1 ./include/interval_set.h: In function 'void interval_set<T>::erase(T, T) [with T = snapid_t]' thread 7fe52ddbe700 time 2016-11-29 04:09:15.130676
./include/interval_set.h: 386: FAILED assert(_size >= 0)

 ceph version 0.94.3 (95cefea9fd9ab740263bf8bb4796fd864d9afe2b)
 1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x85) [0xb20ed5]

 2: (interval_set<snapid_t>::subtract(interval_set<snapid_t> const&)+0xc0) [0x7fa940]

 3: (PG::activate(ObjectStore::Transaction&, unsigned int, std::list<Context*, std::allocator<Context*> >&, std::map<int, std::map<spg_t, pg_query_t, std::less<spg_t>, std::allocator<std::pair<spg_t const, pg_query_t> > >, std::less<int>, std::allocator<std::pair<int const, std::map<spg_t, pg_query_t, std::less<spg_t>, std::allocator<std::pair<spg_t const, pg_query_t> > > > > >&, std::map<int, std::vector<std::pair<pg_notify_t, std::map<unsigned int, pg_interval_t, std::less<unsigned int>, std::allocator<std::pair<unsigned int const, pg_interval_t> > > >, std::allocator<std::pair<pg_notify_t, std::map<unsigned int, pg_interval_t, std::less<unsigned int>, std::allocator<std::pair<unsigned int const, pg_interval_t> > > > > >, std::less<int>, std::allocator<std::pair<int const, std::vector<std::pair<pg_notify_t, std::map<unsigned int, pg_interval_t, std::less<unsigned int>, std::allocator<std::pair<unsigned int const, pg_interval_t> > > >, std::allocator<std::pair<pg_notify_t, std::map<unsigned int, pg_interval_t, std::less<unsigned int>, std::allocator<std::pair<unsigned int const, pg_interval_t> > > > > > > > >*, PG::RecoveryCtx*)+0x703) [0x7cf883]

4: (PG::RecoveryState::Active::Active(boost::statechart::state<PG::RecoveryState::Active, PG::RecoveryState::Primary, PG::RecoveryState::Activating, (boost::statechart::history_mode)0>::my_context)+0x3ff) [0x7d230f]

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