Ceph

Morning found that some OSD dropped out of Tier Cache Pool. Maybe it's a coincidence, but at this point was rollback.

2015-02-05 23:23:18.231723 7fd747ff1700 -1 *** Caught signal (Segmentation fault) **
 in thread 7fd747ff1700

 ceph version 0.80.8 (69eaad7f8308f21573c604f121956e64679a52a7)
 1: /usr/bin/ceph-osd() [0x9bde51]
 2: (()+0xf710) [0x7fd766f97710]
 3: (std::_Rb_tree_decrement(std::_Rb_tree_node_base*)+0xa) [0x7fd7666c1eca]
 4: (ReplicatedPG::make_writeable(ReplicatedPG::OpContext*)+0x14c) [0x87cd5c]
 5: (ReplicatedPG::prepare_transaction(ReplicatedPG::OpContext*)+0x1db) [0x89d29b]
 6: (ReplicatedPG::execute_ctx(ReplicatedPG::OpContext*)+0xcd4) [0x89e0f4]
 7: (ReplicatedPG::do_op(std::tr1::shared_ptr<OpRequest>)+0x2ca5) [0x8a2a55]
 8: (ReplicatedPG::do_request(std::tr1::shared_ptr<OpRequest>, ThreadPool::TPHandle&)+0x5b1) [0x832251]
 9: (OSD::dequeue_op(boost::intrusive_ptr<PG>, std::tr1::shared_ptr<OpRequest>, ThreadPool::TPHandle&)+0x37c) [0x61344c]
 10: (OSD::OpWQ::_process(boost::intrusive_ptr<PG>, ThreadPool::TPHandle&)+0x63d) [0x6472ad]
 11: (ThreadPool::WorkQueueVal<std::pair<boost::intrusive_ptr<PG>, std::tr1::shared_ptr<OpRequest> >, boost::intrusive_ptr<PG> >::_void_process(void*, ThreadPool::TPHandle&)+0xae) [0x67dcde]
 12: (ThreadPool::worker(ThreadPool::WorkThread*)+0x551) [0xa2a181]
 13: (ThreadPool::WorkThread::entry()+0x10) [0xa2d260]
 14: (()+0x79d1) [0x7fd766f8f9d1]
 15: (clone()+0x6d) [0x7fd765f088fd]
 NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.