Description of problem:
Created a distributed replicate volume with quota & indexing enabled. 
From a fuse client, ran glusterfs untar & rm script.
Brought a brick down, & executed `gluster volume heal`
From another fuse client was modifying the script after renaming it.

Crashed the 2nd replica pair with following backtrace:
Core was generated by `/usr/local/sbin/glusterfsd -s localhost --volfile-id vol.dagobah.data-export3 -'.
Program terminated with signal 6, Aborted.
#0  0x00007f32d3e473a5 in __GI_raise (sig=6) 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  0x00007f32d3e473a5 in __GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x00007f32d3e4ab0b in __GI_abort () at abort.c:92
#2  0x00007f32d3e3fd4d in __GI___assert_fail (assertion=0x7f32ce9bfb0f "!\"uuid null\"", file=<optimized out>, line=394, 
    function=<optimized out>) at assert.c:81
#3  0x00007f32ce9a46d9 in marker_start_setxattr (frame=0x7f32d1e1a190, this=0x1231bd0)
    at ../../../../../xlators/features/marker/src/marker.c:394
#4  0x00007f32ce9a4a72 in marker_create_frame (this=0x1231bd0, local=0x7f32c87e5c50)
    at ../../../../../xlators/features/marker/src/marker.c:437
#5  0x00007f32ce9a4b8c in marker_xtime_update_marks (this=0x1231bd0, local=0x7f32c87e5c50)
    at ../../../../../xlators/features/marker/src/marker.c:455
#6  0x00007f32ce9a86be in marker_rename_done (frame=0x7f32d2e65778, cookie=0x0, this=0x1231bd0, op_ret=0, op_errno=0)
    at ../../../../../xlators/features/marker/src/marker.c:974
#7  0x00007f32ce9a888d in marker_rename_release_newp_lock (frame=0x7f32d2e65778, cookie=0x7f32d2e62dd0, this=0x1231bd0, op_ret=0, 
    op_errno=0) at ../../../../../xlators/features/marker/src/marker.c:1007
#8  0x00007f32cebd876e in iot_inodelk_cbk (frame=0x7f32d2e62dd0, cookie=0x7f32d2e66cf8, this=0x1230920, op_ret=0, op_errno=0)
    at ../../../../../xlators/performance/io-threads/src/io-threads.c:1978
#9  0x00007f32cedf6d5c in pl_common_inodelk (frame=0x7f32d2e66cf8, this=0x122f710, volume=0x7f32c87e5aa0 "vol-marker", 
    inode=0x7f32cd6ee04c, cmd=7, flock=0x7f32d1ce4a04, loc=0x7f32d1ce49bc, fd=0x0)
    at ../../../../../xlators/features/locks/src/inodelk.c:653
#10 0x00007f32cedf6dc9 in pl_inodelk (frame=0x7f32d2e66cf8, this=0x122f710, volume=0x7f32c87e5aa0 "vol-marker", loc=0x7f32d1ce49bc, cmd=7, 
    flock=0x7f32d1ce4a04) at ../../../../../xlators/features/locks/src/inodelk.c:663
#11 0x00007f32cebd89ca in iot_inodelk_wrapper (frame=0x7f32d2e62dd0, this=0x1230920, volume=0x7f32c87e5aa0 "vol-marker", 
    loc=0x7f32d1ce49bc, cmd=7, lock=0x7f32d1ce4a04) at ../../../../../xlators/performance/io-threads/src/io-threads.c:1987
#12 0x00007f32d48416a7 in call_resume_wind (stub=0x7f32d1ce497c) at ../../../libglusterfs/src/call-stub.c:2419
#13 0x00007f32d48488dd in call_resume (stub=0x7f32d1ce497c) at ../../../libglusterfs/src/call-stub.c:3938
#14 0x00007f32cebcb8ef in iot_worker (data=0x123b570) at ../../../../../xlators/performance/io-threads/src/io-threads.c:138
#15 0x00007f32d41b7efc in start_thread (arg=0x7f32cd444700) at pthread_create.c:304
#16 0x00007f32d3ef289d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#17 0x0000000000000000 in ?? ()
(gdb) f 3
#3  0x00007f32ce9a46d9 in marker_start_setxattr (frame=0x7f32d1e1a190, this=0x1231bd0)
    at ../../../../../xlators/features/marker/src/marker.c:394
394	        GF_UUID_ASSERT (local->loc.gfid);
(gdb) p local
$1 = (marker_local_t *) 0x7f32c87e5c50
(gdb) p *local
$2 = {timebuf = {876952143, 2250444032}, pid = 26987, loc = {path = 0x7f32c87e5a20 "/smoke1.sh~", name = 0x7f32c87e5a21 "smoke1.sh~", 
    inode = 0x0, parent = 0x7f32cd6ee04c, gfid = '\000' <repeats 15 times>, pargfid = '\000' <repeats 15 times>, "\001"}, parent_loc = {
    path = 0x7f32c87e5e50 "/", name = 0x7f32c87e5e51 "", inode = 0x7f32cd6ee04c, parent = 0x0, gfid = '\000' <repeats 15 times>, 
    pargfid = '\000' <repeats 15 times>}, next_lock_on = 0x0, uid = 0, gid = 0, ref = 2, ia_nlink = 0, lock = 1, mode = 0, err = 0, 
  stub = 0x0, contribution = 0, oplocal = 0x7f32c87e5d50}
(gdb) f 6
#6  0x00007ff76146e6be in marker_rename_done (frame=0x7ff76592d100, cookie=0x0, this=0x1890c00, op_ret=0, op_errno=0)
    at ../../../../../xlators/features/marker/src/marker.c:974
974	                marker_xtime_update_marks (this, local);
(gdb) l marker_rename_done
917	
918	
919	int32_t
920	marker_rename_done (call_frame_t *frame, void *cookie, xlator_t *this,
921	                    int32_t op_ret, int32_t op_errno)
922	{
923	        marker_local_t *local  = NULL, *oplocal = NULL;
924	        loc_t           newloc = {0, };
925	        marker_conf_t  *priv   = NULL;
926	
(gdb) 
927	        local = frame->local;
928	        oplocal = local->oplocal;
929	
930	        priv = this->private;
931	
932	        frame->local = NULL;
933	
934	        if (op_ret < 0) {
935	                if (local->err == 0) {
936	                        local->err = op_errno;
(gdb) 
937	                }
938	
939	                gf_log (this->name, GF_LOG_WARNING,
940	                        "inodelk (UNLOCK) failed on path:%s (gfid:%s) (%s)",
941	                        local->parent_loc.path,
942	                        uuid_utoa (local->parent_loc.inode->gfid),
943	                        strerror (op_errno));
944	        }
945	
946	        if (local->stub != NULL) {
(gdb) 
947	                call_resume (local->stub);
948	                local->stub = NULL;
949	        } else if (local->err != 0) {
950	                STACK_UNWIND_STRICT (rename, frame, -1, local->err, NULL, NULL,
951	                                     NULL, NULL, NULL);
952	        }
953	
954	        mq_reduce_parent_size (this, &oplocal->loc, oplocal->contribution);
955	
956	        if (local->loc.inode != NULL) {
(gdb) 
957	                mq_reduce_parent_size (this, &local->loc, local->contribution);
958	        }
959	
960	        newloc.inode = inode_ref (oplocal->loc.inode);
961	        newloc.path = gf_strdup (local->loc.path);
962	        newloc.name = strrchr (newloc.path, '/');
963	        if (newloc.name)
964	                newloc.name++;
965	        newloc.parent = inode_ref (local->loc.parent);
966	
(gdb) p newloc.path
$12 = 0x0
(gdb) p local->loc
$13 = {path = 0x7ff754296130 "/smoke1.sh~", name = 0x7ff754296131 "smoke1.sh~", inode = 0x0, parent = 0x7ff7601b404c, 
  gfid = '\000' <repeats 15 times>, pargfid = '\000' <repeats 15 times>, "\001"}
(gdb) p newloc.inode
$14 = (inode_t *) 0x0
(gdb) p oplocal->loc.inode
$15 = (inode_t *) 0x7ff7601b404c
(gdb) p *oplocal->loc.inode
$16 = {table = 0x18a6d80, gfid = '\000' <repeats 15 times>, "\001", lock = 1, nlookup = 1, ref = 137571, ia_type = IA_IFDIR, fd_list = {
    next = 0x7ff75becc7f8, prev = 0x7ff75be8f114}, dentry_list = {next = 0x7ff7601b408c, prev = 0x7ff7601b408c}, hash = {
    next = 0x7ff7601b409c, prev = 0x7ff7601b409c}, list = {next = 0x18a6de0, prev = 0x7ff7601b41d4}, _ctx = 0x18bbfe0}