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http://qa-proxy.ceph.com/teuthology/teuthology-2014-04-17_23:01:49-fs-firefly-distro-basic-plana/199687/

Program terminated with signal 11, Segmentation fault.
#0  0x00007f21319d3b7b in raise (sig=<optimized out>) at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:42
42      ../nptl/sysdeps/unix/sysv/linux/pt-raise.c: No such file or directory.
(gdb) bt
#0  0x00007f21319d3b7b in raise (sig=<optimized out>) at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:42
#1  0x00000000005f247e in reraise_fatal (signum=11) at global/signal_handler.cc:59
#2  handle_fatal_signal (signum=11) at global/signal_handler.cc:105
#3  <signal handler called>
#4  Client::verify_reply_trace (this=0x2a8e7f0, r=0, request=<optimized out>, reply=<optimized out>, ptarget=0x7fff51d57030, pcreated=<optimized out>, uid=1000, gid=1000) at client/Client.cc:1259
#5  0x00000000005676aa in Client::make_request (this=0x2a8e7f0, request=0x3019470, uid=1000, gid=1000, ptarget=0x7fff51d57030, pcreated=0x0, use_mds=-1, pdirbl=0x0) at client/Client.cc:1409
#6  0x000000000057ec05 in Client::_rename (this=0x2a8e7f0, fromdir=0x7f211402ac40, fromname=0x7f2131efa040 "d3d", todir=0x7f21140e4ac0, toname=0x7f2131efa044 "d3e", uid=1000, gid=1000) at client/Client.cc:8024
#7  0x000000000057f067 in Client::ll_rename (this=0x2a8e7f0, parent=0x7f211402ac40, name=0x7f2131efa040 "d3d", newparent=0x7f21140e4ac0, newname=0x7f2131efa044 "d3e", uid=1000, gid=1000) at client/Client.cc:8055
#8  0x0000000000538163 in fuse_ll_rename (req=0x2af6b20, parent=<optimized out>, name=0x7f2131efa040 "d3d", newparent=<optimized out>, newname=<optimized out>) at client/fuse_ll.cc:381
#9  0x00007f2131bf1d65 in fuse_session_loop () from /lib/libfuse.so.2
#10 0x0000000000534a88 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at ceph_fuse.cc:165

It's trying to access a Dentry::dir member which is NULL. Didn't look into it any more than that.