Was running dbench on a 2-replica setup. 

(gdb) bt
#0  0x00007f3c37a2bc27 in ?? () from /lib/libgcc_s.so.1
#1  0x00007f3c37a2c48b in _Unwind_Backtrace () from /lib/libgcc_s.so.1
#2  0x00007f3c3a56ecce in *__GI___backtrace (array=<value optimized out>, size=200) at ../sysdeps/x86_64/../ia64/backtrace.c:85
#3  0x00007f3c3b04f8d3 in gf_print_trace (signum=11) at common-utils.c:363
#4  <signal handler called>
#5  0x0000000000000451 in ?? ()
#6  0x00007f3c3ae218b6 in rpcsvc_conn_submit (conn=0x1306278, hdrvec=<value optimized out>, hdrcount=1, proghdr=0x7f3c3b3e9b40, proghdrcount=1, 
    progpayload=0x0, progpayloadcount=0, iobref=0x7f3c30004198, priv=0x451) at rpcsvc.c:1369
#7  0x00007f3c3ae2275e in rpcsvc_submit_generic (req=0x7f3c37f12cc8, proghdr=0x7f3c3b3e9b40, hdrcount=1, payload=0x0, payloadcount=0, iobref=0x1306278)
    at rpcsvc.c:1530
#8  0x00007f3c38bb7a5e in server_submit_reply (frame=0x132c240, req=0x7f3c37f12cc8, arg=<value optimized out>, payload=<value optimized out>, 
    payloadcount=<value optimized out>, iobref=0x7f3c30004198, sfunc=0x7f3c3ac11fe0 <xdr_serialize_writev_rsp>) at server.c:123
#9  0x00007f3c38bc580a in server_writev_cbk (frame=0x132c240, cookie=<value optimized out>, this=0x188, op_ret=65536, op_errno=0, 
    prebuf=<value optimized out>, postbuf=0x7f3c3b3e9de0) at server3_1-fops.c:1235
#10 0x00007f3c38dddb89 in iot_writev_cbk (frame=0x132c5a8, cookie=<value optimized out>, this=<value optimized out>, op_ret=65536, op_errno=0, 
    prebuf=<value optimized out>, postbuf=0x7f3c3b3e9de0) at io-threads.c:945
#11 0x00007f3c38fee989 in pl_writev_cbk (frame=0x7f3c30000c88, cookie=<value optimized out>, this=<value optimized out>, op_ret=65536, op_errno=0, 
    prebuf=<value optimized out>, postbuf=0x7f3c3b3e9de0) at posix.c:497
#12 0x00007f3c39203fc0 in posix_writev (frame=0x7f3c30001328, this=<value optimized out>, fd=<value optimized out>, vector=<value optimized out>, 
    count=<value optimized out>, offset=<value optimized out>, iobref=0x132c148) at posix.c:2548
#13 0x00007f3c38ff0412 in pl_writev (frame=<value optimized out>, this=0x130ba18, fd=0x1329288, vector=0x132c0d8, count=<value optimized out>, 
    offset=<value optimized out>, iobref=0x132c148) at posix.c:736
#14 0x00007f3c38de083d in iot_writev_wrapper (frame=<value optimized out>, this=0x130cdc8, fd=<value optimized out>, vector=0x132c0d8, count=1, 
    offset=983040, iobref=0x132c148) at io-threads.c:955
#15 0x00007f3c3b05367c in call_resume_wind (stub=0x132c648) at call-stub.c:2233
#16 call_resume (stub=0x132c648) at call-stub.c:3852
#17 0x00007f3c38de589a in iot_worker (data=0x13120c8) at io-threads.c:118
#18 0x00007f3c3a7eda04 in start_thread (arg=<value optimized out>) at pthread_create.c:300
#19 0x00007f3c3a556d4d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#20 0x0000000000000000 in ?? ()



configuration details:
argp 1
backtrace 1
dlfcn 1
fdatasync 1
libpthread 1
llistxattr 1
setfsid 1
spinlock 1
epoll.h 1
xattr.h 1
st_atim.tv_nsec 1
package-string: glusterfs 3.1.0git
/lib/libc.so.6[0x7fce6d755530]
/lib/libpthread.so.0(pthread_mutex_lock+0x1)[0x7fce6da9b081]
/gluster/3.1/lib/libglusterfs.so.0(inode_unref+0x1c)[0x7fce6e2fd68c]
/gluster/3.1/lib/glusterfs/3.1.0git/xlator/protocol/client.so(client3_1_releasedir+0x116)[0x7fce6c292ef6]
/gluster/3.1/lib/glusterfs/3.1.0git/xlator/protocol/client.so(client_releasedir+0x156)[0x7fce6c28ba36]
/gluster/3.1/lib/libglusterfs.so.0(fd_unref+0x28f)[0x7fce6e308eaf]
/gluster/3.1/lib/glusterfs/3.1.0git/xlator/cluster/replicate.so(afr_sh_entry_done+0x2c)[0x7fce6c06c14c]
/gluster/3.1/lib/glusterfs/3.1.0git/xlator/cluster/replicate.so(afr_sh_entry_unlck_cbk+0x7d)[0x7fce6c06d64d]
/gluster/3.1/lib/glusterfs/3.1.0git/xlator/protocol/client.so(client3_1_entrylk_cbk+0xb0)[0x7fce6c294400]
/gluster/3.1/lib/libgfrpc.so.0(rpc_clnt_handle_reply+0xab)[0x7fce6e0d2e5b]
/gluster/3.1/lib/libgfrpc.so.0(rpc_clnt_notify+0x7b)[0x7fce6e0d3c2b]
/gluster/3.1/lib/libgfrpc.so.0(rpc_transport_notify+0x26)[0x7fce6e0cf226]
/gluster/3.1/lib/glusterfs/3.1.0git/rpc-transport/socket.so(socket_event_poll_in+0x34)[0x7fce6b3e90d4]
/gluster/3.1/lib/glusterfs/3.1.0git/rpc-transport/socket.so(socket_event_handler+0xd8)[0x7fce6b3e91c8]
/gluster/3.1/lib/libglusterfs.so.0[0x7fce6e30aab4]
/gluster/3.1/sbin/glusterfs(main+0x1e2)[0x404b72]
/lib/libc.so.6(__libc_start_main+0xfd)[0x7fce6d740abd]
/gluster/3.1/sbin/glusterfs[0x402d39]