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

[Nick O'Connor]

** Description changed:

  [ 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 ]
  
-  * The triggers for the issue are difficult to replicate and have to do
- with the timing of Ganesha communicating with Gluster. I have compiled
- the patch against version 4.3-8ubuntu1 of nfs-ganesha and it resolved
- the issue on my system.
+  * I experienced crashes about once per day on volumes with heavy large
+ file random access. I've been running the proposed patch since
+ 2024-05-06 and haven't experienced a single crash.
  
  [ 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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https://bugs.launchpad.net/bugs/2065856

Title:
  SEGFAULTs in v4.3 with GlusterFS

Status in nfs-ganesha package in Ubuntu:
  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
  2024-05-06 and haven't experienced a single crash.

  [ 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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