Ceph

See thread "[ceph-users] failed to open snapshot after 'rados cppool '" at e.g. http://www.spinics.net/lists/ceph-users/msg07357.html

After doing that cppool, an attempt to delete no-longer-existing rbd snapshots crashes the monitor with

osd/osd_types.cc: 799: FAILED assert(is_unmanaged_snaps_mode())

 ceph version 0.72.2 (a913ded2ff138aefb8cb84d347d72164099cfd60)
 1: /usr/bin/ceph-mon() [0x6c96e9]
 2: (OSDMonitor::prepare_pool_op(MPoolOp*)+0x970) [0x5c3ad0]
 3: (OSDMonitor::prepare_update(PaxosServiceMessage*)+0x1ab) [0x5c3d8b]
 4: (PaxosService::dispatch(PaxosServiceMessage*)+0xa1a) [0x5940ea]
 5: (Context::complete(int)+0x9) [0x565499]
 6: (finish_contexts(CephContext*, std::list<Context*, std::allocator<Context*> >&, int)+0x95) [0x5698b5]
 7: (Paxos::handle_last(MMonPaxos*)+0xb6e) [0x58cdde]
 8: (Paxos::dispatch(PaxosServiceMessage*)+0x2ab) [0x58d68b]
 9: (Monitor::dispatch(MonSession*, Message*, bool)+0x4f0) [0x563620]
 10: (Monitor::_ms_dispatch(Message*)+0x1fb) [0x5639fb]
 11: (Monitor::ms_dispatch(Message*)+0x32) [0x57f212]
 12: (DispatchQueue::entry()+0x582) [0x7de6c2]
 13: (DispatchQueue::DispatchThread::entry()+0xd) [0x7d994d]
 14: (()+0x79d1) [0x7f186b9b59d1]
 15: (clone()+0x6d) [0x7f186a6ecb6d]