Bug 1470220 - glusterfs process leaking memory when error occurs
glusterfs process leaking memory when error occurs
Product: GlusterFS
Classification: Community
Component: fuse (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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: ---
Assigned To: Danny Couture
: Triaged
Depends On:
Blocks: 1471025 1471028
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Reported: 2017-07-12 10:28 EDT by Danny Couture
Modified: 2017-10-26 10:35 EDT (History)
3 users (show)

See Also:
Fixed In Version: glusterfs-3.12.0
Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of:
: 1470329 1471025 1471028 (view as bug list)
Last Closed: 2017-09-05 13:36:59 EDT
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Danny Couture 2017-07-12 10:28:07 EDT
Description of problem:

When an error occurs on nodes, it is possible that an error unwinding function is called instead of the fuse_release function. In this case, the current state of the code will leak a 88 bytes ctx structure.

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

How reproducible:

Steps to Reproduce:
1.Setup a 3 nodes replicaset (2 nodes might be enough)
2.Write the same file over and over again on one node
3.Try to read that same file over and over again on a second node.

Actual results:
==19736== Thread 1:
==19736== 88 bytes in 1 blocks are definitely lost in loss record 257 of 591
==19736==    at 0x4C277BB: calloc (vg_replace_malloc.c:593)
==19736==    by 0x4E90C31: __gf_calloc (mem-pool.c:117)
==19736==    by 0xD56373D: __fuse_fd_ctx_check_n_create (fuse-bridge.c:79)
==19736==    by 0xD56381E: fuse_fd_ctx_check_n_create (fuse-bridge.c:108)
==19736==    by 0xD56F473: fuse_open_resume (fuse-bridge.c:2148)
==19736==    by 0xD564CE9: fuse_fop_resume (fuse-bridge.c:556)
==19736==    by 0xD562803: fuse_resolve_done (fuse-resolve.c:663)
==19736==    by 0xD5628D9: fuse_resolve_all (fuse-resolve.c:690)
==19736==    by 0xD5627E4: fuse_resolve (fuse-resolve.c:654)
==19736==    by 0xD5628B0: fuse_resolve_all (fuse-resolve.c:686)
==19736==    by 0xD562937: fuse_resolve_continue (fuse-resolve.c:706)
==19736==    by 0xD561CDE: fuse_resolve_inode (fuse-resolve.c:364)
==19736==    by 0xD5627D6: fuse_resolve (fuse-resolve.c:651)
==19736==    by 0xD56285B: fuse_resolve_all (fuse-resolve.c:679)
==19736==    by 0xD562975: fuse_resolve_and_resume (fuse-resolve.c:718)
==19736==    by 0xD56FAF8: fuse_open (fuse-bridge.c:2185)
==19736==    by 0xD57DA2A: fuse_thread_proc (fuse-bridge.c:5068)
==19736==    by 0x5C32AA0: start_thread (pthread_create.c:301)
==19736==    by 0x1633C6FF: ???

Expected results:
no leaks

Additional info:
on our production environment, this happens often enough that we must restart the gluster process every 2-3 months to avoid OOM
Comment 1 Worker Ant 2017-07-12 12:07:23 EDT
REVIEW: https://review.gluster.org/17759 (memory leak fixes) posted (#1) for review on master by Danny Couture (couture.danny@gmail.com)
Comment 2 Danny Couture 2017-07-12 13:07:23 EDT
I just confirmed the bug for mainline @ a4a417e29c5b2d63e6bf5efae4f0ccf30a39647f
Comment 3 Worker Ant 2017-07-13 06:22:31 EDT
REVIEW: https://review.gluster.org/17759 (memory leak fixes) posted (#2) for review on master by Danny Couture (couture.danny@gmail.com)
Comment 4 Worker Ant 2017-07-13 06:31:57 EDT
REVIEW: https://review.gluster.org/17759 (memory leak fixes) posted (#3) for review on master by Danny Couture (couture.danny@gmail.com)
Comment 5 Worker Ant 2017-07-13 08:33:58 EDT
REVIEW: https://review.gluster.org/17759 (fuse: memory leak fixes) posted (#4) for review on master by Niels de Vos (ndevos@redhat.com)
Comment 6 Worker Ant 2017-07-14 05:35:28 EDT
COMMIT: https://review.gluster.org/17759 committed in master by Niels de Vos (ndevos@redhat.com) 
commit 5ee383fed9f6408d303aa539dda071275021f8e4
Author: Danny Couture <couture.danny@gmail.com>
Date:   Wed Jul 5 09:55:17 2017 -0400

    fuse: memory leak fixes
    Fix fuse ctx memory leak in case an error occurs and the cleanup path
    is different than usual. Also fix a memory leak in logging if
    eh_save_history() fails.
    Change-Id: I7ec967c807b0ed91184e5b958be70702215c46c9
    BUG: 1470220
    Signed-off-by: Danny Couture <couture.danny@gmail.com>
    Reviewed-on: https://review.gluster.org/17759
    Reviewed-by: Niels de Vos <ndevos@redhat.com>
    Smoke: Gluster Build System <jenkins@build.gluster.org>
    Reviewed-by: N Balachandran <nbalacha@redhat.com>
    Reviewed-by: Prashanth Pai <ppai@redhat.com>
    Reviewed-by: Amar Tumballi <amarts@redhat.com>
    Tested-by: Amar Tumballi <amarts@redhat.com>
    CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
    Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
Comment 7 Shyamsundar 2017-09-05 13:36:59 EDT
This bug is getting closed because a release has been made available that should address the reported issue. In case the problem is still not fixed with glusterfs-3.12.0, please open a new bug report.

glusterfs-3.12.0 has been announced on the Gluster mailinglists [1], packages for several distributions should become available in the near future. Keep an eye on the Gluster Users mailinglist [2] and the update infrastructure for your distribution.

[1] http://lists.gluster.org/pipermail/announce/2017-September/000082.html
[2] https://www.gluster.org/pipermail/gluster-users/

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