Got this core while running dbench on an Dist-Replicate setup with error-gen below NFS Xlator

(gdb) bt
#0  0x00007f6bfd9ab4b5 in *__GI_raise (sig=<value optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x00007f6bfd9aef50 in *__GI_abort () at abort.c:92
#2  0x00007f6bfd9a4481 in *__GI___assert_fail (assertion=0x7f6bfe15789e "inode->ref", file=<value optimized out>, line=356, 
    function=0x7f6bfe157ae0 "__inode_unref") at assert.c:81
#3  0x00007f6bfe1339d1 in __inode_unref (inode=0x7f6bec01b390) at inode.c:356
#4  0x00007f6bfe133ab1 in inode_unref (inode=0x7f6bec01b390) at inode.c:395
#5  0x00007f6bfe122419 in loc_wipe (loc=0xebd120) at xlator.c:986
#6  0x00007f6bfccf2626 in afr_local_cleanup (local=0xebd0f0, this=0xe8b7d0) at afr.c:334
#7  0x00007f6bfcd09c54 in afr_unlink_done (frame=0xf57198, this=0xe8b7d0) at afr-dir-write.c:1723
#8  0x00007f6bfcd1aa0a in afr_unlock_common_cbk (frame=0xf57198, cookie=0x7f6bec00ec70, this=0xe8b7d0, op_ret=0, op_errno=0) at afr-transaction.c:514
#9  0x00007f6bfcf6c1aa in client_entrylk_cbk (frame=0x7f6bec00ec70, hdr=0x7f6bec018da0, hdrlen=108, iobuf=0x0) at client-protocol.c:5073
#10 0x00007f6bfcf6ede6 in protocol_client_interpret (this=0xe87880, trans=0xe94350, hdr_p=0x7f6bec018da0 "", hdrlen=108, iobuf=0x0)
    at client-protocol.c:6093
#11 0x00007f6bfcf6fb67 in protocol_client_pollin (this=0xe87880, trans=0xe94350) at client-protocol.c:6391
#12 0x00007f6bfcf70160 in notify (this=0xe87880, event=2, data=0xe94350) at client-protocol.c:6510
#13 0x00007f6bfe1221c8 in xlator_notify (xl=0xe87880, event=2, data=0xe94350) at xlator.c:919
#14 0x00007f6bfb9c845a in socket_event_poll_in (this=0xe94350) at socket.c:731
#15 0x00007f6bfb9c878d in socket_event_handler (fd=9, idx=1, data=0xe94350, poll_in=1, poll_out=0, poll_err=0) at socket.c:831
#16 0x00007f6bfe149736 in event_dispatch_epoll_handler (event_pool=0xe82310, events=0xe96570, i=1) at event.c:804
#17 0x00007f6bfe149928 in event_dispatch_epoll (event_pool=0xe82310) at event.c:867
#18 0x00007f6bfe149c47 in event_dispatch (event_pool=0xe82310) at event.c:975
#19 0x0000000000406cb0 in main (argc=7, argv=0x7fffaa7024f8) at glusterfsd.c:1494


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