Description of problem:
======================
glusterd crash on 2 nodes while snapshot was in progress when file creation was in progress on the client

Version-Release number of selected component (if applicable):
============================================================
glusterfs 3.5qa2

How reproducible:


Steps to Reproduce:
==================
1.Create a dist-rep volume and start it 

2.Fuse and NFS mount the volume and create some files 
for i in {1..100}; do dd if=/dev/urandom of=fuse"$i" bs=10M count=1; done
for i in {1..100}; do dd if=/dev/urandom of=nfs"$i" bs=10M count=1; done

3.While file creation is in progress create multiple snapshots 
for i in {1..100} ; do gluster snapshot create snap_vol1_$i vol1 ; done
snapshot create: snap_vol1_1: snap created successfully
snapshot create: snap_vol1_2: snap created successfully
snapshot create: snap_vol1_3: snap created successf
.
.
snapshot create: snap_vol1_69: snap created successfully
snapshot create: failed: Commit failed on 10.70.44.56. Please check log file for details.
Snapshot command failed
.
.
snapshot create: snap_vol1_92: snap created successfully
snapshot create: failed: Commit failed on 10.70.44.57. Please check log file for details.
Snapshot command failed

While snapshot creation was in progress created another volume and took snapshots 


bt :
===
(gdb) bt
#0  0x0000003bd380f867 in ?? () from /lib64/libgcc_s.so.1
#1  0x0000003bd3810119 in _Unwind_Backtrace () from /lib64/libgcc_s.so.1
#2  0x0000003bcf0febf6 in backtrace () from /lib64/libc.so.6
#3  0x0000003bd041e956 in _gf_msg_backtrace_nomem (level=<value optimized out>, stacksize=200) at logging.c:971
#4  0x0000003bd0437410 in gf_print_trace (signum=11, ctx=0x1aed010) at common-utils.c:530
#5  <signal handler called>
#6  0x00000000000001c1 in ?? ()
#7  0x0000003bd0c08196 in rpcsvc_transport_submit (trans=<value optimized out>, rpchdr=<value optimized out>, 
    rpchdrcount=<value optimized out>, proghdr=<value optimized out>, proghdrcount=<value optimized out>, 
    progpayload=<value optimized out>, progpayloadcount=0, iobref=0x7faca041b350, priv=0x0) at rpcsvc.c:1006
#8  0x0000003bd0c08b18 in rpcsvc_submit_generic (req=0x7facb5d9902c, proghdr=0x2138bd0, 
    hdrcount=<value optimized out>, payload=0x0, payloadcount=0, iobref=0x7faca041b350) at rpcsvc.c:1190
#9  0x0000003bd0c08f46 in rpcsvc_error_reply (req=0x7facb5d9902c) at rpcsvc.c:1238
#10 0x0000003bd0c08fbb in rpcsvc_check_and_reply_error (ret=-1, frame=<value optimized out>, opaque=0x7facb5d9902c)
    at rpcsvc.c:492
#11 0x0000003bd0457c3a in synctask_wrap (old_task=<value optimized out>) at syncop.c:335
#12 0x0000003bcf043bf0 in ?? () from /lib64/libc.so.6
#13 0x0000000000000000 in ?? ()

Actual results:
==============
glusterd crash while snapshot was in progress 

Expected results:
=================
There should be no glusterd crash 


Additional info: