Description of problem:
gluster cli crashed when volume heal command is given (it does not crash everytime when heal command is given.).

This is the backtrace of the crash.

Core was generated by `gluster volume heal mirror'.
Program terminated with signal 11, Segmentation fault.
#0  pthread_spin_lock (lock=0xcafebad6) at ../nptl/sysdeps/x86_64/../i386/pthread_spin_lock.c:35
35	../nptl/sysdeps/x86_64/../i386/pthread_spin_lock.c: No such file or directory.
	in ../nptl/sysdeps/x86_64/../i386/pthread_spin_lock.c
(gdb) bt
#0  pthread_spin_lock (lock=0xcafebad6) at ../nptl/sysdeps/x86_64/../i386/pthread_spin_lock.c:35
#1  0x00007ff342bf2d31 in mem_put (ptr=0x1f4b530) at ../../../libglusterfs/src/mem-pool.c:530
#2  0x000000000040a614 in STACK_DESTROY (stack=0x1f21cdc) at ../../../libglusterfs/src/stack.h:188
#3  0x000000000040e830 in cli_cmd_volume_heal_cbk (state=0x7ffffe16f6e0, word=0x1f4c6b0, words=0x7ffffe16f8b0, wordcount=3)
    at ../../../cli/src/cli-cmd-volume.c:1681
#4  0x0000000000409d49 in cli_cmd_process (state=0x7ffffe16f6e0, argc=3, argv=0x7ffffe16f8b0) at ../../../cli/src/cli-cmd.c:150
#5  0x0000000000409793 in cli_batch (d=0x7ffffe16f6e0) at ../../../cli/src/input.c:44
#6  0x00007ff342555d8c in start_thread (arg=0x7ff340067700) at pthread_create.c:304
#7  0x00007ff341f1204d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#8  0x0000000000000000 in ?? ()
(gdb) f 1
#1  0x00007ff342bf2d31 in mem_put (ptr=0x1f4b530) at ../../../libglusterfs/src/mem-pool.c:530
530	        LOCK (&pool->lock);
(gdb) p pool
$1 = (struct mem_pool *) 0xcafebabe
(gdb) up
#2  0x000000000040a614 in STACK_DESTROY (stack=0x1f21cdc) at ../../../libglusterfs/src/stack.h:188
188	                mem_put (local);
(gdb) l
183	                FRAME_DESTROY (stack->frames.next);
184	        }
185	        mem_put (stack);
186	
187	        if (local)
188	                mem_put (local);
189	}
190	
191	static inline void
192	STACK_RESET (call_stack_t *stack)
(gdb) up
#3  0x000000000040e830 in cli_cmd_volume_heal_cbk (state=0x7ffffe16f6e0, word=0x1f4c6b0, words=0x7ffffe16f8b0, wordcount=3)
    at ../../../cli/src/cli-cmd-volume.c:1681
1681	                STACK_DESTROY (frame->root);
(gdb) l
1676	
1677	        if (options)
1678	                dict_unref (options);
1679	
1680	        if (frame)
1681	                STACK_DESTROY (frame->root);
1682	
1683	        return ret;
1684	}
1685	
(gdb) 


Version-Release number of selected component (if applicable):


How reproducible:

not always

Steps to Reproduce:
1. volume heal command
2.
3.
  
Actual results:

gluster volume heal command segfaulted gluster cli

Expected results:

gluster cli should not crash

Additional info: