[Bug 2065856] [NEW] SEGFAULTs in v4.3

[Nick O'Connor]

Public bug reported:

[ 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.

[ Where problems could occur ]

 * Possible memory leaks, however this change has been part of nfs-
ganesha since v5. The latest version of nfs-ganesha is 5.7. I don't know
of other related issues.

[ 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

** Affects: nfs-ganesha (Ubuntu)
     Importance: Undecided
         Status: New

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

Title:
  SEGFAULTs in v4.3

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.

  [ Where problems could occur ]

   * Possible memory leaks, however this change has been part of nfs-
  ganesha since v5. The latest version of nfs-ganesha is 5.7. I don't
  know of other related issues.

  [ 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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