Ceph

when osd use leveldb as filestore(add configur options osd_objectstore = keyvaluestore-dev in ceph.conf), i used qemu rbd , after i attached rbd to one vm , everything seems ok , i can get disk label by 'fdisk -l' , however , when i used 'dd if=/dev/zero of=/dev/vdb bs=1M &', the ceph cluster crashed, i saw "bad op" error, the attached file is detail log.

-8> 2014-05-19 10:47:44.828717 7f55579aa700 10 osd.0 pg_epoch: 245 pg[3.3f( v 245'1 (0'0,245'1] local-les=222 n=1 ec=44 les/c 222/222 221/221/173) [0,44] r=0 lpr=221 luod=0'0 crt=0'0 lcod 0'0 mlcod 0'0 active+clean] append_log  adding 1 keys
    -7> 2014-05-19 10:47:44.828753 7f55579aa700 10 write_log with: dirty_to: 0'0, dirty_from: 4294967295'18446744073709551615, dirty_divergent_priors: 0, writeout_from: 245'1, trimmed:
    -6> 2014-05-19 10:47:44.828821 7f5564dff700 12 KeyValueStore::op_tp worker wq KeyValueStore::OpWQ start processing 0x8b7dc20 (1 active)
    -5> 2014-05-19 10:47:44.828818 7f55579aa700 10 osd.0 pg_epoch: 245 pg[3.3f( v 245'1 (0'0,245'1] local-les=222 n=1 ec=44 les/c 222/222 221/221/173) [0,44] r=0 lpr=221 luod=0'0 crt=0'0 lcod 0'0 mlcod 0'0 active+clean] eval_repop repgather(0x76a0840 245'1 rep_tid=1 committed?=0 applied?=0 lock=0 op=osd_op(client.4358.0:104 rbd_data.10426b8b4567.0000000000000004 [set-alloc-hint object_size 4194304 write_size 4194304,write 0~4194304] 3.bf28a03f ack+ondisk+write e245) v4) wants=ad
    -4> 2014-05-19 10:47:44.828839 7f55579aa700 10 osd.0 245 dequeue_op 0xa57c780 finish
    -3> 2014-05-19 10:47:44.828843 7f55579aa700 15 OSD::op_tp worker wq OSD::OpWQ done processing 0x1 (0 active)
    -2> 2014-05-19 10:47:44.828846 7f55579aa700 20 OSD::op_tp worker waiting
    -1> 2014-05-19 10:47:44.829013 7f5564dff700 -1 bad op 2307
     0> 2014-05-19 10:47:44.830448 7f5564dff700 -1 os/KeyValueStore.cc: In function 'unsigned int KeyValueStore::_do_transaction(ObjectStore::Transaction&, KeyValueStore::BufferTransaction&, SequencerPosition&, ThreadPool::TPHandle*)' thread 7f5564dff700 time 2014-05-19 10:47:44.829023
os/KeyValueStore.cc: 1457: FAILED assert(0)

ceph version 0.80.1 (a38fe1169b6d2ac98b427334c12d7cf81f809b74)
 1: (KeyValueStore::_do_transaction(ObjectStore::Transaction&, KeyValueStore::BufferTransaction&, SequencerPosition&, ThreadPool::TPHandle*)+0x1d0) [0x9d8720]
 2: (KeyValueStore::_do_transactions(std::list<ObjectStore::Transaction*, std::allocator<ObjectStore::Transaction*> >&, unsigned long, ThreadPool::TPHandle*)+0x8e) [0x9daa0e]
 3: (KeyValueStore::_do_op(KeyValueStore::OpSequencer*, ThreadPool::TPHandle&)+0x97) [0x9dab17]
 4: (ThreadPool::worker(ThreadPool::WorkThread*)+0x68a) [0xb5101a]
 5: (ThreadPool::WorkThread::entry()+0x10) [0xb52270]
 6: (()+0x7e9a) [0x7f556d321e9a]
 7: (clone()+0x6d) [0x7f556b8ccccd]
 NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.