Ceph

While working on cephfs tests that aggressively create/delete pools, saw this crash on master:

268619   -269> 2015-07-22 12:21:39.232780 7f4275ffd700 -1 ./osd/OSDMap.h: In function 'const string& OSDMap::get_pool_name(int64_t) const' thread 7f4275ffd700 time 2015-07-22 12:21:39.215478
268620 ./osd/OSDMap.h: 724: FAILED assert(i != pool_name.end())                        
268621                                                                                 
268622  ceph version 9.0.2-755-g44464f9 (44464f9c689bcbf961521ff6053d0a431be06b75)     
268623  1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x80) [0x1aef453]
268624  2: (OSDMap::get_pool_name(long) const+0x7a) [0x14342d0]                        
268625  3: (PGPool::update(std::tr1::shared_ptr<OSDMap const>)+0xbf) [0x163c8b5]       
268626  4: (PG::handle_advance_map(std::tr1::shared_ptr<OSDMap const>, std::tr1::shared_ptr<OSDMap const>, std::vector<int, std::allocator<int> >&, int, std::vector<int, std::allocator<int> >&, int, PG::RecoveryC       tx*)+0x297) [0x16674db]
268627  5: (OSD::advance_pg(unsigned int, PG*, ThreadPool::TPHandle&, PG::RecoveryCtx*, std::set<boost::intrusive_ptr<PG>, std::less<boost::intrusive_ptr<PG> >, std::allocator<boost::intrusive_ptr<PG> > >*)+0x418       ) [0x140e8b6]
268628  6: (OSD::process_peering_events(std::list<PG*, std::allocator<PG*> > const&, ThreadPool::TPHandle&)+0x19a) [0x141f916]
268629  7: (OSD::PeeringWQ::_process(std::list<PG*, std::allocator<PG*> > const&, ThreadPool::TPHandle&)+0x30) [0x143ca00]
268630  8: (ThreadPool::BatchWorkQueue<PG>::_void_process(void*, ThreadPool::TPHandle&)+0x33) [0x14e188d]
268631  9: (ThreadPool::worker(ThreadPool::WorkThread*)+0x70b) [0x1adf45d]             
268632  10: (ThreadPool::WorkThread::entry()+0x23) [0x1ae3413]                         
268633  11: (Thread::entry_wrapper()+0xa8) [0x1ad78b4]                                 
268634  12: (Thread::_entry_func(void*)+0x18) [0x1ad7802]                              
268635  13: (()+0x7555) [0x7f4292706555]                                               
268636  14: (clone()+0x6d) [0x7f4290f21f3d]                                            
268637  NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.
268638