[Bugs] [Bug 1285616] New: Brick crashes because of race in bit-rot init

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1285616

            Bug ID: 1285616
           Summary: Brick crashes because of race in bit-rot init
           Product: GlusterFS
           Version: mainline
         Component: bitrot
          Assignee: pkarampu at redhat.com
          Reporter: pkarampu at redhat.com
                CC: bugs at gluster.org
      Docs Contact: bugs at gluster.org



Description of problem:
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fce642eb420 in pthread_mutex_lock () from ./lib64/libpthread.so.0
(gdb) bt
#0  0x00007fce642eb420 in pthread_mutex_lock () from ./lib64/libpthread.so.0
#1  0x00007fce52ee2e13 in br_stub_worker (data=0x7fce54010f90)
    at
/home/jenkins/root/workspace/rackspace-regression-2GB-triggered/xlators/features/bit-rot/src/stub/bit-rot-stub-helpers.c:337
#2  0x00007fce642e9a51 in start_thread () from ./lib64/libpthread.so.0
#3  0x00007fce63c5393d in clone () from ./lib64/libc.so.6
(gdb) fr 1
#1  0x00007fce52ee2e13 in br_stub_worker (data=0x7fce54010f90)
    at
/home/jenkins/root/workspace/rackspace-regression-2GB-triggered/xlators/features/bit-rot/src/stub/bit-rot-stub-helpers.c:337
337   
/home/jenkins/root/workspace/rackspace-regression-2GB-triggered/xlators/features/bit-rot/src/stub/bit-rot-stub-helpers.c:
No such file or directory.
(gdb) info locals
priv = 0x0
this = 0x7fce54010f90
stub = 0x0
ret = 0

init may not have initialized this->private by the time br_stub_worker starts
running, leading to NULL dereference.
Version-Release number of selected component (if applicable):

How reproducible:
This is observed at
https://build.gluster.org/job/rackspace-regression-2GB-triggered/16180/consoleFull

Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:

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