[Gluster-devel] Regression failure: glusterd segfault in rcu_read_unlock_bp

[Anand Nekkunti]

Hi Kotresh
    This is related urcu  bug in glusterd , we are working on this bug .
problem :we are using sync task frame work for locking and unloking in 
glusterd, it will swap the threads  if there is no worker poll threads 
not available , due this rcu lock done in one thread and rcu unlock is 
done in other thread (urcu-bp will not allow this), so glusterd is 
crashing .

Regards
Anand.N

On 04/16/2015 03:29 PM, Kotresh Hiremath Ravishankar wrote:
> Hi All,
>
> I see glusterd SEGFAULT for my patch with the following stack trace. I see that is not related to my patch.
> Could someone look into this? I will retrigger regression for my patch.
>
> #0  0x00007f86f0968d16 in rcu_read_unlock_bp () from /home/kotresh/Downloads/regression/usr/lib64/liburcu-bp.so.1
> (gdb) bt
> #0  0x00007f86f0968d16 in rcu_read_unlock_bp () from /home/kotresh/Downloads/regression/usr/lib64/liburcu-bp.so.1
> #1  0x00007f86f1235467 in gd_commit_op_phase (op=GD_OP_START_VOLUME, op_ctx=0x7f86f9d5a230, req_dict=0x7f86f9d5bf2c, op_errstr=0x7f86e0244260,
>      txn_opinfo=0x7f86e02441e0) at /home/jenkins/root/workspace/rackspace-regression-2GB-triggered/xlators/mgmt/glusterd/src/glusterd-syncop.c:1360
> #2  0x00007f86f1236366 in gd_sync_task_begin (op_ctx=0x7f86f9d5a230, req=0xcb6b8c)
>      at /home/jenkins/root/workspace/rackspace-regression-2GB-triggered/xlators/mgmt/glusterd/src/glusterd-syncop.c:1736
> #3  0x00007f86f123654b in glusterd_op_begin_synctask (req=0xcb6b8c, op=GD_OP_START_VOLUME, dict=0x7f86f9d5a230)
>      at /home/jenkins/root/workspace/rackspace-regression-2GB-triggered/xlators/mgmt/glusterd/src/glusterd-syncop.c:1787
> #4  0x00007f86f1221402 in __glusterd_handle_cli_start_volume (req=0xcb6b8c)
>      at /home/jenkins/root/workspace/rackspace-regression-2GB-triggered/xlators/mgmt/glusterd/src/glusterd-volume-ops.c:471
> #5  0x00007f86f1190291 in glusterd_big_locked_handler (req=0xcb6b8c, actor_fn=0x7f86f122110d <__glusterd_handle_cli_start_volume>)
>      at /home/jenkins/root/workspace/rackspace-regression-2GB-triggered/xlators/mgmt/glusterd/src/glusterd-handler.c:83
> #6  0x00007f86f12214a3 in glusterd_handle_cli_start_volume (req=0xcb6b8c)
>      at /home/jenkins/root/workspace/rackspace-regression-2GB-triggered/xlators/mgmt/glusterd/src/glusterd-volume-ops.c:489
> #7  0x00007f86fc375f66 in synctask_wrap (old_task=0x7f86e0041760) at /home/jenkins/root/workspace/rackspace-regression-2GB-triggered/libglusterfs/src/syncop.c:375
> #8  0x00007f86fb1508f0 in ?? () from /home/kotresh/Downloads/regression/lib64/libc.so.6
> #9  0x0000000000000000 in ?? ()
>
>
> Link to the core file:
> http://slave27.cloud.gluster.org/archived_builds/build-install-20150416:07:11:15.tar.bz2
>
>
> Thanks and Regards,
> Kotresh H R
>
> _______________________________________________
> Gluster-devel mailing list
> Gluster-devel at gluster.org
> http://www.gluster.org/mailman/listinfo/gluster-devel