[Bug 2065856] Re: SEGFAULTs in v4.3

[Nick O'Connor]

** Patch added: "fix-sigsev-in-free-space.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/nfs-ganesha/+bug/2065856/+attachment/5778936/+files/fix-sigsev-in-free-space.debdiff

** Patch removed: "fix-sigsev-in-free-space.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/nfs-ganesha/+bug/2065856/+attachment/5778933/+files/fix-sigsev-in-free-space.debdiff

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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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