Ceph » CephFS

one of my 3 mds crashed quickly after startup of the whole cluster:
this is using latest unstable (00c3dafd5afe6461fe3f0c09dcf4b5b585a740fc)

Core was generated by `/usr/bin/cmds i r1-10 -c /tmp/fetched.ceph.conf.1155'.
Program terminated with signal 6, Aborted.
#0 0x00007fbcb188da75 in GI_raise (sig=<value optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
64 ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
in ../nptl/sysdeps/unix/sysv/linux/raise.c
(gdb) bt
#0 0x00007fbcb188da75 in *_GI_raise (sig=<value optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1 0x00007fbcb18915c0 in *_GI_abort () at abort.c:92
#2 0x00007fbcb1886941 in *__GI_assert_fail (assertion=0x6d7d80 "lock>get_state() 2 || lock->get_state() 15 || lock->get_state() == 21", file=<value optimized out>,
line=3468, function=0x6d85c0 "void Locker::handle_file_lock(ScatterLock, MLock*)") at assert.c:81
#3 0x0000000000574a0b in Locker::handle_file_lock (this=0xcd0b50, lock=0xce7570, m=0x7fbc9c000a30) at mds/Locker.cc:3468
#4 0x000000000049ef0d in MDS::_dispatch (this=0xcd2da0, m=0x7fbc9c000a30) at mds/MDS.cc:1427
#5 0x000000000049f3dd in MDS::ms_dispatch (this=0xcd2da0, m=0x7fbc9c000a30) at mds/MDS.cc:1281
#6 0x0000000000480309 in Messenger::ms_deliver_dispatch (this=<value optimized out>) at msg/Messenger.h:97
#7 SimpleMessenger::dispatch_entry (this=<value optimized out>) at msg/SimpleMessenger.cc:332
#8 0x0000000000473bac in SimpleMessenger::DispatchThread::entry (this=0xcd6760) at msg/SimpleMessenger.h:494
#9 0x00000000004850ea in Thread::_entry_func (arg=0x4e8) at ./common/Thread.h:39
#10 0x00007fbcb27209ca in start_thread (arg=<value optimized out>) at pthread_create.c:300
#11 0x00007fbcb19406cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()