[Bugs] [Bug 1226830] New: Scrubber crash upon pause

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1226830

            Bug ID: 1226830
           Summary: Scrubber crash upon pause
           Product: GlusterFS
           Version: 3.7.0
         Component: bitrot
          Assignee: bugs at gluster.org
          Reporter: vshankar at redhat.com
                CC: bugs at gluster.org
      Docs Contact: bugs at gluster.org



Description of problem:
Pausing scrubber results in scrubber process crashing at times.

Version-Release number of selected component (if applicable):
3.7.0

How reproducible:
Sometimes

Steps to Reproduce:
1. Create & start a Gluster volume
2. Enable bitrot on the volume
3. Pause scrubber for this volume as per below:

# gluster volume bitrot <vol> scrub pause

Actual results:
Scrubber process crashes at times

Expected results:
Scrubber process should be running (although it should not scrub the filesystem
for the volume)

BT (reported by anekkunt:
http://www.gluster.org/pipermail/gluster-devel/2015-June/045410.html)

(gdb) bt
#0  0x00007f89d6224731 in gf_tw_mod_timer_pending (base=0xf2fbc0, timer=0x0,
expires=233889) at
/home/jenkins/root/workspace/rackspace-regression-2GB-triggered/contrib/timer-wheel/timer-wheel.c:239
#1  0x00007f89c82ce7e8 in br_fsscan_reschedule (this=0x7f89c4008980,
child=0x7f89c4011238, fsscan=0x7f89c4012290, fsscrub=0x7f89c4010010,
pendingcheck=_gf_true)
    at
/home/jenkins/root/workspace/rackspace-regression-2GB-triggered/xlators/features/bit-rot/src/bitd/bit-rot-scrub.c:703
#2  0x00007f89c82cc9d4 in reconfigure (this=0x7f89c4008980,
options=0x7f89d3bc9558) at
/home/jenkins/root/workspace/rackspace-regression-2GB-triggered/xlators/features/bit-rot/src/bitd/bit-rot.c:1673
#3  0x00007f89d62044cd in xlator_reconfigure_rec (old_xl=0x7f89c4008980,
new_xl=0x7f89c409b460) at
/home/jenkins/root/workspace/rackspace-regression-2GB-triggered/libglusterfs/src/options.c:1084
#4  0x00007f89d6204414 in xlator_reconfigure_rec (old_xl=0x7f89c400a6c0,
new_xl=0x7f89c409c500) at
/home/jenkins/root/workspace/rackspace-regression-2GB-triggered/libglusterfs/src/options.c:1070
#5  0x00007f89d62045df in xlator_tree_reconfigure (old_xl=0x7f89c400a6c0,
new_xl=0x7f89c409c500) at
/home/jenkins/root/workspace/rackspace-regression-2GB-triggered/libglusterfs/src/options.c:1112
#6  0x00007f89d61ec7bd in glusterfs_graph_reconfigure (oldgraph=0x7f89c4001d30,
newgraph=0x7f89c4098130) at
/home/jenkins/root/workspace/rackspace-regression-2GB-triggered/libglusterfs/src/graph.c:893
#7  0x00007f89d61ec629 in glusterfs_volfile_reconfigure (oldvollen=932,
newvolfile_fp=0x7f89c4097eb0, ctx=0xefe010,

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