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

[Nick O'Connor]

My initial patch missed a line from the original commit (which doesn't
cleanly apply to v4.3). I've fixed the patch and it resolves the issue.

** Summary changed:

- SEGFAULTs in v4.3 with Gluster
+ SEGFAULTs in v4.3 with GlusterFS

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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.

  [ 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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