[Bug 2064843] Re: Brick SEGFAULTs in 11.1

[Nick O'Connor]

** Summary changed:

- Gluster 11.1 brick SEGFAULT
+ Brick SEGFAULTs in 11.1

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Title:
  Brick SEGFAULTs in 11.1

Status in glusterfs package in Ubuntu:
  Triaged
Status in glusterfs source package in Noble:
  In Progress
Status in glusterfs source package in Oracular:
  Triaged

Bug description:
  [ 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 ]

   * 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.

  [ 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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