[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-27 Thread Launchpad Bug Tracker
This bug was fixed in the package glusterfs - 11.1-4ubuntu0.1

---
glusterfs (11.1-4ubuntu0.1) noble; urgency=medium

  * Fix stack overflow in __inode_destroy due to recursive calls to
inode_unref.
(LP: #2064843)

 -- Nick O'Connor   Wed, 08 May 2024 18:49:32 -0700

** Changed in: glusterfs (Ubuntu Noble)
   Status: Fix Committed => Fix Released

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-27 Thread Andreas Hasenack
DEP8 is also clear, and from comments #19 and #22 I conclude that the
test was performed from the version in proposed.

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-19 Thread Christian Ehrhardt 
Thank you that satisfies the test case, a few more day of maturing.

** Tags removed: verification-needed verification-needed-noble
** Tags added: verification-done verification-done-noble

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-17 Thread Nick O'Connor
Zero crashes. Service uptime 1d 9h.

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-17 Thread Nick O'Connor
** Description changed:

  [ Impact ]
  
   * Users experience brick SEGFAULTs under certain not-yet-understood
  scenarios. Some reports include a high percentage of small file I/O. I
  encountered the issue roughly every hour with Minio backed by GlusterFS
  on ZFS.
  
   * This bug introduces an increased risk of data loss or corruption
  depending on the user's configuration and timing of brick crashes.
  
   * Core dumps from multiple users revealed that the SEGFAULTs are caused
  by a stack overflow when namespaced inodes are destroyed.
  
   * The patch removes the recursive call to inode_unref when a namespaced
  inode is destroyed.
  
  [ Test Plan ]
  
  * I experienced brick crashes on specific volumes about once per hour.
  On my system, this issue only impacted a locally mounted volume backing
  a Minio instance (an S3 API compatible server) used by Restic clients
  (an incremental backup system with lots of small file creations and
  deletions). Other volumes served with NFS Ganesha with primarily large
  file random access never triggered it.
  
  * I attempted to replicate the workload by running various file system
  benchmarking tools within their own user namespace (i.e. lots of small
  file creations and deletion) but was not able to replicate the crash.
  
  * I've been running the proposed patch since 2024-05-06 and haven't
  experienced a single crash.
  
- Therefore, the test plan is to run the packages from proposed for at
- least a day, under the same load as when the bug happened, and confirm
- that the crashes reported in this bug no longer happen.
+ * The test plan is to run the packages from proposed for at least a day,
+ under the same load as when the bug happened, and confirm that the
+ crashes reported in this bug no longer happen.
  
  [ Where problems could occur ]
  
   * It's conceivable that this patch introduces undesired behavior when
  inodes are destroyed, however I highly doubt this scenario as
  __inode_destroy was not recursive before the change which introduced the
  bug.
  
  [ Other Info ]
  
   * PR which introduced the bug: https://github.com/gluster/glusterfs/pull/1763
   * PR which added this patch: https://github.com/gluster/glusterfs/pull/4302
   * Issue discussion: https://github.com/gluster/glusterfs/issues/4295

** Description changed:

  [ Impact ]
  
   * Users experience brick SEGFAULTs under certain not-yet-understood
  scenarios. Some reports include a high percentage of small file I/O. I
  encountered the issue roughly every hour with Minio backed by GlusterFS
  on ZFS.
  
   * This bug introduces an increased risk of data loss or corruption
  depending on the user's configuration and timing of brick crashes.
  
   * Core dumps from multiple users revealed that the SEGFAULTs are caused
  by a stack overflow when namespaced inodes are destroyed.
  
   * The patch removes the recursive call to inode_unref when a namespaced
  inode is destroyed.
  
  [ Test Plan ]
  
- * I experienced brick crashes on specific volumes about once per hour.
+  * I experienced brick crashes on specific volumes about once per hour.
  On my system, this issue only impacted a locally mounted volume backing
  a Minio instance (an S3 API compatible server) used by Restic clients
  (an incremental backup system with lots of small file creations and
  deletions). Other volumes served with NFS Ganesha with primarily large
  file random access never triggered it.
  
- * I attempted to replicate the workload by running various file system
+  * I attempted to replicate the workload by running various file system
  benchmarking tools within their own user namespace (i.e. lots of small
  file creations and deletion) but was not able to replicate the crash.
  
- * I've been running the proposed patch since 2024-05-06 and haven't
+  * I've been running the proposed patch since 2024-05-06 and haven't
  experienced a single crash.
  
- * The test plan is to run the packages from proposed for at least a day,
- under the same load as when the bug happened, and confirm that the
+  * The test plan is to run the packages from proposed for at least a
+ day, under the same load as when the bug happened, and confirm that the
  crashes reported in this bug no longer happen.
  
  [ Where problems could occur ]
  
   * It's conceivable that this patch introduces undesired behavior when
  inodes are destroyed, however I highly doubt this scenario as
  __inode_destroy was not recursive before the change which introduced the
  bug.
  
  [ Other Info ]
  
   * PR which introduced the bug: https://github.com/gluster/glusterfs/pull/1763
   * PR which added this patch: https://github.com/gluster/glusterfs/pull/4302
   * Issue discussion: https://github.com/gluster/glusterfs/issues/4295

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-16 Thread Nick O'Connor
Packages installed and running. Looks good so far. I'll continue to
monitor it.

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-14 Thread Bryce Harrington
Yep, I changed it to 11.1-4ubuntu0.1 when I uploaded, per that policy.

Regarding the samba autopkgtest, I've just retriggered it to re-run.
We've been having some false positive errors due to infrastructure
timeouts, and this looks like one of those.

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-14 Thread Nick O'Connor
Ah, ok. Per https://github.com/canonical/ubuntu-maintainers-
handbook/blob/main/VersionStrings.md#version-adding-a-change-in-ubuntu-
as-a-stable-release-update the part after the dot specifies that it's an
SRU.

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-14 Thread Nick O'Connor
The new version in noble-proposed is "11.1-4ubuntu0.1" vs the patch
which has "11.1-4ubuntu1". Is that expected or did I screw up the patch?

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-14 Thread Andreas Hasenack
Hello Nick, or anyone else affected,

Accepted glusterfs into noble-proposed. The package will build now and
be available at
https://launchpad.net/ubuntu/+source/glusterfs/11.1-4ubuntu0.1 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
noble to verification-done-noble. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-noble. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: glusterfs (Ubuntu Noble)
   Status: Incomplete => Fix Committed

** Tags added: verification-needed verification-needed-noble

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-14 Thread Nick O'Connor
Yep! Understood. I'll install them once available.

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-14 Thread Andreas Hasenack
Thanks, I added a small conclusion to make it clear what we expect.
Please keep in mind that once the packages in noble-proposed are built,
those are the ones that need testing, even if your local builds have the
same patch, ok?

Thanks again

** Description changed:

  [ Impact ]
  
   * Users experience brick SEGFAULTs under certain not-yet-understood
  scenarios. Some reports include a high percentage of small file I/O. I
  encountered the issue roughly every hour with Minio backed by GlusterFS
  on ZFS.
  
   * This bug introduces an increased risk of data loss or corruption
  depending on the user's configuration and timing of brick crashes.
  
   * Core dumps from multiple users revealed that the SEGFAULTs are caused
  by a stack overflow when namespaced inodes are destroyed.
  
   * The patch removes the recursive call to inode_unref when a namespaced
  inode is destroyed.
  
  [ Test Plan ]
  
  * I experienced brick crashes on specific volumes about once per hour.
  On my system, this issue only impacted a locally mounted volume backing
  a Minio instance (an S3 API compatible server) used by Restic clients
  (an incremental backup system with lots of small file creations and
  deletions). Other volumes served with NFS Ganesha with primarily large
  file random access never triggered it.
  
  * I attempted to replicate the workload by running various file system
  benchmarking tools within their own user namespace (i.e. lots of small
  file creations and deletion) but was not able to replicate the crash.
  
  * I've been running the proposed patch since 2024-05-06 and haven't
  experienced a single crash.
  
+ Therefore, the test plan is to run the packages from proposed for at
+ least a day, under the same load as when the bug happened, and confirm
+ that the crashes reported in this bug no longer happen.
+ 
  [ Where problems could occur ]
  
   * It's conceivable that this patch introduces undesired behavior when
  inodes are destroyed, however I highly doubt this scenario as
  __inode_destroy was not recursive before the change which introduced the
  bug.
  
  [ Other Info ]
  
   * PR which introduced the bug: https://github.com/gluster/glusterfs/pull/1763
   * PR which added this patch: https://github.com/gluster/glusterfs/pull/4302
   * Issue discussion: https://github.com/gluster/glusterfs/issues/4295

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-14 Thread Nick O'Connor
Hi Andreas! I've updated the testing section. PTAL.

** Description changed:

  [ Impact ]
  
   * Users experience brick SEGFAULTs under certain not-yet-understood
  scenarios. Some reports include a high percentage of small file I/O. I
  encountered the issue roughly every hour with Minio backed by GlusterFS
  on ZFS.
  
   * This bug introduces an increased risk of data loss or corruption
  depending on the user's configuration and timing of brick crashes.
  
   * Core dumps from multiple users revealed that the SEGFAULTs are caused
  by a stack overflow when namespaced inodes are destroyed.
  
-  * The patch removes the recursive call to inode_unref when a namespaced
+  * The patch removes the recursive call to inode_unref when a namespaced
  inode is destroyed.
  
  [ Test Plan ]
  
-  * The triggers for the issue are not well understood. I have compiled
- the patch against version 11.1-4build3 of glusterfs and it resolved the
- issue on my system.
+ * I experienced brick crashes on specific volumes about once per hour.
+ On my system, this issue only impacted a locally mounted volume backing
+ a Minio instance (an S3 API compatible server) used by Restic clients
+ (an incremental backup system with lots of small file creations and
+ deletions). Other volumes served with NFS Ganesha with primarily large
+ file random access never triggered it.
+ 
+ * I attempted to replicate the workload by running various file system
+ benchmarking tools within their own user namespace (i.e. lots of small
+ file creations and deletion) but was not able to replicate the crash.
+ 
+ * I've been running the proposed patch since 2024-05-06 and haven't
+ experienced a single crash.
  
  [ Where problems could occur ]
  
   * It's conceivable that this patch introduces undesired behavior when
  inodes are destroyed, however I highly doubt this scenario as
  __inode_destroy was not recursive before the change which introduced the
  bug.
  
  [ Other Info ]
  
   * PR which introduced the bug: https://github.com/gluster/glusterfs/pull/1763
   * PR which added this patch: https://github.com/gluster/glusterfs/pull/4302
   * Issue discussion: https://github.com/gluster/glusterfs/issues/4295

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-14 Thread Andreas Hasenack
** Changed in: glusterfs (Ubuntu Noble)
   Status: Fix Committed => Incomplete

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-14 Thread Andreas Hasenack
@nick-oconnor, thanks for your work on this bug, specially on the
troubleshooting.

To proceed with accepting this package into noble-proposed, I would
kindly ask you to update the [Test plan] section with the conditions you
described in comment #11 that trigger the crash, even if not
immediately.

What I mean is that it's fine to have a test plan that acknowledges that
the crash is hard to reproduce, and just describe the scenario where it
happens with frequency X, but without being able to detail exactly what
is causing it. As long as you have such a deployment, where with the bug
the crashes happen periodically, and with the proposed packages you can
assert that the after a much longer time it does not happen anymore,
that's good enough.

So let's say, if you get crashes every hour, we could say that after a
day without crashes of this type, the bug is confirmed fixed.

How does that sound?

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-13 Thread Bryce Harrington
Hi Nick,

Good work on the troubleshooting analysis, and while a set of steps
didn't reveal themselves it sounds like you narrowed the conditions down
a good bit, ala "locally mounted volume which backs a Minio instance (an
S3 API compatible server) used by Restic clients (an incremental backup
system) triggered this crash".  I'd encourage you to use that to help
update the bug description.  Even if it can't be boiled down to a paint-
by-numbers set of tests, if it can be expressed as a very specific
configuration and a statistical measure of crash frequency (once an
hour), that can sometimes be sufficient for the SRU reviewers to accept
it.

Looks like the oracular fix landed without issue.  For the noble fix,
unfortunately as I understand it the SRU team is quite swamped right now
due to heavy SRU requests for 24.04, and they're estimating the queue
size is up to ~6 weeks, so it may take them time before they can process
or provide feedback on this one.  Meanwhile stay tuned.

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-12 Thread Launchpad Bug Tracker
This bug was fixed in the package glusterfs - 11.1-4ubuntu1

---
glusterfs (11.1-4ubuntu1) oracular; urgency=medium

  * Fix stack overflow in __inode_destroy due to recursive calls to
inode_unref.
(LP: #2064843)

 -- Nick O'Connor   Wed, 08 May 2024 18:49:32 -0700

** Changed in: glusterfs (Ubuntu Oracular)
   Status: Fix Committed => Fix Released

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-12 Thread Nick O'Connor
Hi Bryce!

I really appreciate you getting this submitted.

I took a day and looked through the code/tests for GlusterFS and
couldn't figure out how to reliably trigger the crash. For my system, I
experienced brick crashes about once per hour, but only with specific
volumes. For instance, the volumes which I serve with NFS Ganesha never
triggered this crash (they triggered a different **crash with NFS
Ganesha, but not within GlusterFS). Only a locally mounted volume which
backs a Minio instance (an S3 API compatible server) used by Restic
clients (an incremental backup system) triggered this crash. I attempted
to replicate the workload by running various file system benchmarking
tools within their own user namespace (i.e. lots of small file
creations/deletions) but that never triggered the crash either. I've
been running the above patch since 2024-05-06 and haven't experienced a
single crash. Unfortunately I'm at a loss for what else to try.

FWIW I filed this because my experience upgrading my NAS machines from
22.04 to 24.04 was extremely poor due to issues with GlusterFS and NFS
Ganesha.

**https://bugs.launchpad.net/ubuntu/+source/nfs-ganesha/+bug/2065856

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-12 Thread Bryce Harrington
For the noble SRU, I've also sponsored the upload of the package for
you:

Uploading to ubuntu (via ftp to upload.ubuntu.com):
  Uploading glusterfs_11.1-4ubuntu0.1.dsc: done.
  Uploading glusterfs_11.1-4ubuntu0.1.debian.tar.xz: done.  
  Uploading glusterfs_11.1-4ubuntu0.1_source.buildinfo: done.  
  Uploading glusterfs_11.1-4ubuntu0.1_source.changes: done.
Successfully uploaded packages.

To be honest, however, I'm not sure if this will pass SRU review.  That
team tends to want to see a detailed test plan to ensure the issue is
definitively found without the patch, and confirmed absent with it.
Even if it's just statistically (e.g. "crashes multiple times a day
without this fix, but with the fix it should be crash-free for several
days) that documents how the upload can be verified.

You may also want to sharpen your pencil on the impact statement.  "not
yet understood" may be a bit of a red flag that there may be more
diagnosis homework needing done.

A stack trace or crash dump would be appropriate to include in the Other
Info section.  That can often be useful for other users to help them
evaluate if they're affected by this same issue or have something
unrelated.

Thanks again for working on this bug!

** Changed in: glusterfs (Ubuntu Noble)
   Status: Confirmed => Fix Committed

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-12 Thread Bryce Harrington
Hi Nick,

Sorry for the delay - Athos got tied up with another project, but I can
help in moving this forward.

Thank you for the links to the upstream history, and from that it
appears this is only affecting glusterfs 11.x, thus correctly targets
noble and oracular.

I've reviewed your debdiff and the patch in question.  The changes look
sensible to me, and you've given attention to the patch DEP3 header.
I've tweaked the changelog entry to include a bit more detail, and
retargeted it to oracle.  The changes are on a branch here:

https://code.launchpad.net/~bryce/ubuntu/+source/glusterfs/+git/glusterfs/+ref/ubuntu/oracular-
devel

The fixed package is now uploaded to oracular:

Vcs-Git: https://git.launchpad.net/~bryce/ubuntu/+source/glusterfs
Vcs-Git-Commit: 55391d03e55f519d17f7698e6e6478caf5f53b78
Vcs-Git-Ref: refs/heads/sru-lp2064843-oracular

gpg: ../glusterfs_11.1-4ubuntu1_source.changes: Valid signature from 
E603B2578FB8F0FB
Checking signature on .dsc
gpg: ../glusterfs_11.1-4ubuntu1.dsc: Valid signature from E603B2578FB8F0FB
Uploading to ubuntu (via ftp to upload.ubuntu.com):
  Uploading glusterfs_11.1-4ubuntu1.dsc: done.
  Uploading glusterfs_11.1-4ubuntu1.debian.tar.xz: done.  
  Uploading glusterfs_11.1-4ubuntu1_source.buildinfo: done.  
  Uploading glusterfs_11.1-4ubuntu1_source.changes: done.
Successfully uploaded packages.


** Changed in: glusterfs (Ubuntu Oracular)
   Status: Triaged => Fix Committed

** Changed in: glusterfs (Ubuntu Noble)
   Status: In Progress => Confirmed

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Title:
  Brick SEGFAULTs in 11.1

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-06-06 Thread Bryce Harrington
** Changed in: glusterfs (Ubuntu Oracular)
 Assignee: Athos Ribeiro (athos-ribeiro) => Bryce Harrington (bryce)

** Changed in: glusterfs (Ubuntu Noble)
 Assignee: Athos Ribeiro (athos-ribeiro) => Bryce Harrington (bryce)

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Title:
  Brick SEGFAULTs in 11.1

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-05-22 Thread Athos Ribeiro
** Changed in: glusterfs (Ubuntu Oracular)
 Assignee: (unassigned) => Athos Ribeiro (athos-ribeiro)

** Changed in: glusterfs (Ubuntu Noble)
 Assignee: (unassigned) => Athos Ribeiro (athos-ribeiro)

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  Brick SEGFAULTs in 11.1

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-05-17 Thread Nick O'Connor
** Changed in: glusterfs (Ubuntu Noble)
 Assignee: Nick O'Connor (nick-oconnor) => (unassigned)

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  Brick SEGFAULTs in 11.1

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-05-16 Thread Nick O'Connor
This is ready for review/sponsorship

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-05-16 Thread Nick O'Connor
** Patch added: "fix-stack-overflow-in-inode-destroy.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/glusterfs/+bug/2064843/+attachment/5778935/+files/fix-stack-overflow-in-inode-destroy.debdiff

** Patch removed: "fix-stack-overflow-in-inode-destroy.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/glusterfs/+bug/2064843/+attachment/5777078/+files/fix-stack-overflow-in-inode-destroy.debdiff

** Patch removed: "fix-stack-overflow-in-inode-destroy.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/glusterfs/+bug/2064843/+attachment/5778934/+files/fix-stack-overflow-in-inode-destroy.debdiff

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  Brick SEGFAULTs in 11.1

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-05-16 Thread Nick O'Connor
** Patch added: "fix-stack-overflow-in-inode-destroy.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/glusterfs/+bug/2064843/+attachment/5778934/+files/fix-stack-overflow-in-inode-destroy.debdiff

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  Brick SEGFAULTs in 11.1

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[Bug 2064843] Re: Brick SEGFAULTs in 11.1

2024-05-15 Thread Nick O'Connor
** Summary changed:

- Gluster 11.1 brick SEGFAULT
+ Brick SEGFAULTs in 11.1

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