MDS crash

root@ceph0:/var/lib/ceph/osd# ceph status detail
   health HEALTH_WARN mds a is laggy
   monmap e1: 1 mons at {a=192.168.178.10:6789/0}, election epoch 1, quorum 0 a
   osdmap e25: 2 osds: 2 up, 2 in
    pgmap v637: 576 pgs: 576 active+clean; 0 bytes data, 4978 MB used, 922 GB / 927 GB avail
   mdsmap e2273: 1/1/1 up {0=a=up:replay(laggy or crashed)}

root@ceph0:/var/lib/ceph/osd#
root@ceph0:/var/log/ceph# tail -100 ceph-mds.a.log
  max_recent     10000
  max_new         1000
  log_file /var/log/ceph/ceph-mds.a.log
--- end dump of recent events ---
2013-04-13 00:23:34.188173 7fa63dd29700 -1 *** Caught signal (Aborted) **
 in thread 7fa63dd29700

 ceph version 0.60 (f26f7a39021dbf440c28d6375222e21c94fe8e5c)
 1: /usr/bin/ceph-mds() [0x84364a]
 2: (()+0xfcb0) [0x7fa64291fcb0]
 3: (gsignal()+0x35) [0x7fa6416fb425]
 4: (abort()+0x17b) [0x7fa6416feb8b]
 5: (__gnu_cxx::__verbose_terminate_handler()+0x11d) [0x7fa64204d69d]
 6: (()+0xb5846) [0x7fa64204b846]
 7: (()+0xb5873) [0x7fa64204b873]
 8: (()+0xb596e) [0x7fa64204b96e]
 9: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x1df) [0x7a084f]
 10: (MDSTable::load_2(int, ceph::buffer::list&, Context*)+0x421) [0x692ae1]
 11: (Objecter::handle_osd_op_reply(MOSDOpReply*)+0xe38) [0x6e6f08]
 12: (MDS::handle_core_message(Message*)+0xae8) [0x4d1018]
 13: (MDS::_dispatch(Message*)+0x2f) [0x4d11df]
 14: (MDS::ms_dispatch(Message*)+0x1db) [0x4d2c7b]
 15: (DispatchQueue::entry()+0x341) [0x813491]
 16: (DispatchQueue::DispatchThread::entry()+0xd) [0x7901ad]
 17: (()+0x7e9a) [0x7fa642917e9a]
 18: (clone()+0x6d) [0x7fa6417b8cbd]
 NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.

--- begin dump of recent events ---
     0> 2013-04-13 00:23:34.188173 7fa63dd29700 -1 *** Caught signal (Aborted) **
 in thread 7fa63dd29700

 ceph version 0.60 (f26f7a39021dbf440c28d6375222e21c94fe8e5c)
 1: /usr/bin/ceph-mds() [0x84364a]
 2: (()+0xfcb0) [0x7fa64291fcb0]
 3: (gsignal()+0x35) [0x7fa6416fb425]
 4: (abort()+0x17b) [0x7fa6416feb8b]
 5: (__gnu_cxx::__verbose_terminate_handler()+0x11d) [0x7fa64204d69d]
 6: (()+0xb5846) [0x7fa64204b846]
 7: (()+0xb5873) [0x7fa64204b873]
 8: (()+0xb596e) [0x7fa64204b96e]
 9: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x1df) [0x7a084f]
 10: (MDSTable::load_2(int, ceph::buffer::list&, Context*)+0x421) [0x692ae1]
 11: (Objecter::handle_osd_op_reply(MOSDOpReply*)+0xe38) [0x6e6f08]
 12: (MDS::handle_core_message(Message*)+0xae8) [0x4d1018]
 13: (MDS::_dispatch(Message*)+0x2f) [0x4d11df]
 14: (MDS::ms_dispatch(Message*)+0x1db) [0x4d2c7b]
 15: (DispatchQueue::entry()+0x341) [0x813491]
 16: (DispatchQueue::DispatchThread::entry()+0xd) [0x7901ad]
 17: (()+0x7e9a) [0x7fa642917e9a]
 18: (clone()+0x6d) [0x7fa6417b8cbd]
 NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.

--- logging levels ---
   0/ 5 none
   0/ 1 lockdep
   0/ 1 context
   1/ 1 crush
   1/ 5 mds
   1/ 5 mds_balancer
   1/ 5 mds_locker
   1/ 5 mds_log
   1/ 5 mds_log_expire
   1/ 5 mds_migrator
   0/ 1 buffer
   0/ 1 timer
   0/ 1 filer
   0/ 1 striper
   0/ 1 objecter
   0/ 5 rados
   0/ 5 rbd
   0/ 5 journaler
   0/ 5 objectcacher
   0/ 5 client
   0/ 5 osd
   0/ 5 optracker
   0/ 5 objclass
   1/ 3 filestore
   1/ 3 journal
   0/ 5 ms
   1/ 5 mon
   0/10 monc
   0/ 5 paxos
   0/ 5 tp
   1/ 5 auth
   1/ 5 crypto
   1/ 1 finisher
   1/ 5 heartbeatmap
   1/ 5 perfcounter
   1/ 5 rgw
   1/ 5 hadoop
   1/ 5 javaclient
   1/ 5 asok
   1/ 1 throttle
  -2/-2 (syslog threshold)
  -1/-1 (stderr threshold)
  max_recent     10000
  max_new         1000
  log_file /var/log/ceph/ceph-mds.a.log
--- end dump of recent events ---
root@ceph0:/var/log/ceph#
root@ceph0:/var/log/ceph# cat /etc/ceph/ceph.conf
[global]

        # For version 0.55 and beyond, you must explicitly enable
        # or disable authentication with "auth" entries in [global].

        auth cluster required = none
        auth service required = none
        auth client required = none

[osd]
        osd journal size = 1000

        #The following assumes ext4 filesystem.
        filestore xattr use omap = false        # false for XFS


        # For Bobtail (v 0.56) and subsequent versions, you may
        # add settings for mkcephfs so that it will create and mount
        # the file system on a particular OSD for you. Remove the comment `#`
        # character for the following settings and replace the values
        # in braces with appropriate values, or leave the following settings
        # commented out to accept the default values. You must specify the
        # --mkfs option with mkcephfs in order for the deployment script to
        # utilize the following settings, and you must define the 'devs'
        # option for each osd instance; see below.

        #osd mkfs type = xfs
        #osd mkfs options {fs-type} = {mkfs options}   # default for xfs is "-f"
        #osd mount options {fs-type} = {mount options} # default mount option is "rw,noatime"

        # For example, for ext4, the mount option might look like this:

        #osd mkfs options ext4 = user_xattr,rw,noatime

        # Execute $ hostname to retrieve the name of your host,
        # and replace {hostname} with the name of your host.
        # For the monitor, replace {ip-address} with the IP
        # address of your host.

[mon.a]

        host = ceph0
        mon addr = 192.168.178.10:6789

[osd.0]
        host = ceph0

        # For Bobtail (v 0.56) and subsequent versions, you may
        # add settings for mkcephfs so that it will create and mount
        # the file system on a particular OSD for you. Remove the comment `#`
        # character for the following setting for each OSD and specify
        # a path to the device if you use mkcephfs with the --mkfs option.

        #devs = /var/lib/ceph/osd/ceph-0