Thread 1 (Thread 0x7f6388ca4700 (LWP 40351)):
#0  0x00007f63a6f50fcb in raise (sig=11) at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:37
#1  0x0000000000beb4b5 in reraise_fatal (signum=11) at /home/ubuntu/src/markhpc/ceph/src/global/signal_handler.cc:69
#2  handle_fatal_signal (signum=11) at /home/ubuntu/src/markhpc/ceph/src/global/signal_handler.cc:133
#3  <signal handler called>
#4  btree::btree_iterator<btree::btree_node<btree::btree_map_params<std::string, ceph::buffer::ptr, std::less<std::string>, std::allocator<std::pair<std::string const, ceph::buffer::ptr> >, 256> >, std::pair<std::string const, ceph::buffer::ptr>&, std::pair<std::string const, ceph::buffer::ptr>*>::increment_slow (this=0xce60408) at /home/ubuntu/src/markhpc/ceph/src/include/cpp-btree/btree.h:1678
#5  0x0000000000b55cd1 in increment (this=0xce60408) at /home/ubuntu/src/markhpc/ceph/src/include/cpp-btree/btree.h:781
#6  operator++ (this=0xce60408) at /home/ubuntu/src/markhpc/ceph/src/include/cpp-btree/btree.h:813
#7  operator++ (this=0xce60408) at /home/ubuntu/src/markhpc/ceph/src/include/cpp-btree/btree.h:822
#8  MSStore::MSWholeSpaceIteratorImpl::next (this=0xce60400) at /home/ubuntu/src/markhpc/ceph/src/kv/MemDBStore.cc:426
#9  0x0000000000ae86c7 in BlueStore::collection_list (this=this@entry=0xbdd2000, c_=..., start=..., end=..., 
    sort_bitwise=sort_bitwise@entry=true, max=max@entry=64, ls=ls@entry=0x7f6388ca1fe0, pnext=pnext@entry=0x7f6388ca2000)
    at /home/ubuntu/src/markhpc/ceph/src/os/bluestore/BlueStore.cc:3954
#10 0x0000000000aef179 in BlueStore::collection_list (this=this@entry=0xbdd2000, cid=..., start=..., end=..., 
    sort_bitwise=sort_bitwise@entry=true, max=max@entry=64, ls=ls@entry=0x7f6388ca1fe0, pnext=pnext@entry=0x7f6388ca2000)
    at /home/ubuntu/src/markhpc/ceph/src/os/bluestore/BlueStore.cc:3842
#11 0x000000000074bd7a in remove_dir (cct=0xbd5a220, store=0xbdd2000, mapper=mapper@entry=0xc82e4c8, osdriver=osdriver@entry=0xc82e418, 
    osr=0xbcc83c0, coll=..., dstate=warning: RTTI symbol not found for class 'std::_Sp_counted_deleter<DeletingState*, SharedPtrRegistry<spg_t, DeletingState, std::less<spg_t> >::OnRemoval, std::allocator<int>, (__gnu_cxx::_Lock_policy)2>'
warning: RTTI symbol not found for class 'std::_Sp_counted_deleter<DeletingState*, SharedPtrRegistry<spg_t, DeletingState, std::less<spg_t> >::OnRemoval, std::allocator<int>, (__gnu_cxx::_Lock_policy)2>'
std::shared_ptr (count 3, weak 1) 0xcd16540, finished=finished@entry=0x7f6388ca264f, handle=...)
    at /home/ubuntu/src/markhpc/ceph/src/osd/OSD.cc:4609
---Type <return> to continue, or q <return> to quit---
#12 0x000000000074c77b in OSD::RemoveWQ::_process (this=0xbe9f518, item=..., handle=...)
    at /home/ubuntu/src/markhpc/ceph/src/osd/OSD.cc:4670
#13 0x00000000007ab83a in ThreadPool::WorkQueueVal<std::pair<boost::intrusive_ptr<PG>, std::shared_ptr<DeletingState> >, std::pair<boost::intrusive_ptr<PG>, std::shared_ptr<DeletingState> > >::_void_process (this=0xbe9f518, handle=...)
    at /home/ubuntu/src/markhpc/ceph/src/common/WorkQueue.h:210
#14 0x0000000000d67bc9 in ThreadPool::worker (this=0xbe9e860, wt=0xbeaa100) at /home/ubuntu/src/markhpc/ceph/src/common/WorkQueue.cc:132
#15 0x0000000000d68ba0 in ThreadPool::WorkThread::entry (this=<optimized out>) at /home/ubuntu/src/markhpc/ceph/src/common/WorkQueue.h:445
#16 0x00007f63a6f49dc5 in start_thread (arg=0x7f6388ca4700) at pthread_create.c:308
#17 0x00007f63a572028d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113