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

[Nick O'Connor]

This is ready for review/sponsorship.

** 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.
+ 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.
  
  [ 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:
  New

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 ]

   * 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.

  [ 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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