[Bug 2065856] Re: SEGFAULTs in v4.3 with GlusterFS

[Christian Ehrhardt ]

Hi, I come by reviewing patches that have patches to sponsor, trying to help this going forward.
Thank you for your work and linking the related upstream discussions.

The patch is merged upstream but only in 5.0 and later.
There have been some reports that around 4.0 it was still ok.
Comparing that to Ubuntu revisions that means we need to consider fixing mantic, noble and oracular (as per SRU policy we need to fix all to avoid the issue coming back on upgrades).

Earlier releases do not have the issue, and the patch can be dropped
once we merge 5.0 or later.

Updating bug states accordingly.

** Also affects: nfs-ganesha (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Also affects: nfs-ganesha (Ubuntu Oracular)
   Importance: Undecided
       Status: In Progress

** Also affects: nfs-ganesha (Ubuntu Mantic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2065856

Title:
  SEGFAULTs in v4.3 with GlusterFS

Status in nfs-ganesha package in Ubuntu:
  In Progress
Status in nfs-ganesha source package in Mantic:
  New
Status in nfs-ganesha source package in Noble:
  New
Status in nfs-ganesha source package in Oracular:
  In Progress

Bug description:
  [ Impact ]

   * Users experience SEGFAULTs when Ganesha fails to communicate with
  Gluster, causing the NFS share to disappear.

   * The patch refactors how free_space() is called to avoid the null
  pointer deference.

  [ Test Plan ]

   * I experienced crashes about once per day on volumes with heavy
  large file random access. I've been running the proposed patch since
  2024-05-16 and haven't experienced a single crash.

   * The test plan is to run the packages from proposed for at least 5
  days, under the same load as when the bug happened, and confirm that
  the crashes reported in this bug no longer happen.

  [ Other Info ]

   * Commit which added this patch: https://github.com/nfs-ganesha/nfs-ganesha/commit/336abcba0b9e0dae0aadb4657c311d04862f2028
   * Issue discussion: https://github.com/nfs-ganesha/nfs-ganesha/issues/904

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