On 10/05/2016 07:32 PM, Pranith Kumar Karampuri wrote:
On Wed, Oct 5, 2016 at 2:00 PM, Soumya Koduri <skoduri@xxxxxxxxxx
<mailto:skoduri@xxxxxxxxxx>> wrote:
Hi,
With http://review.gluster.org/#/c/15051/
<http://review.gluster.org/#/c/15051/>, performace/client-io-threads
is enabled by default. But with that we see regression caused to
nfs-ganesha application trying to un/re-export any glusterfs volume.
This shall be the same case with any gfapi application using
glfs_fini().
More details and the RCA can be found at [1].
In short, iot-worker threads spawned (when the above option is
enabled) are not cleaned up as part of io-threads-xlator->fini() and
those threads could end up accessing invalid/freed memory post
glfs_fini().
The actual fix is to address io-threads-xlator->fini() to cleanup
those threads before exiting. But since those threads' IDs are
currently not stored, the fix could be very intricate and take a
while. So till then to avoid all existing applications crash, I
suggest to keep this option disabled by default and update this
known_issue with enabling this option in the release-notes.
I sent a patch to revert the commit -
http://review.gluster.org/#/c/15616/
<http://review.gluster.org/#/c/15616/> [2]
Good catch! I think the correct fix would be to make sure all threads
die as part of PARENT_DOWN then?
From my understanding, I think these threads should be cleaned up as
part of xlator->fini().I am not sure if it needs to be handled even for
PARENT_DOWN as well. Do we re-spawn the threads as part of PARENT_UP then?
Till that part gets fixed, can we make this option back to off by
default to avoid the regressions with master and release-3.9 branch?
Thanks,
Soumya
Comments/Suggestions are welcome.
Thanks,
Soumya
[1] https://bugzilla.redhat.com/show_bug.cgi?id=1380619#c11
<https://bugzilla.redhat.com/show_bug.cgi?id=1380619#c11>
[2] http://review.gluster.org/#/c/15616/
<http://review.gluster.org/#/c/15616/>
--
Pranith
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