** Patch added: "CIFS: Close open handle after interrupted close"
   
https://bugs.launchpad.net/ubuntu/+source/linux-azure-4.15/+bug/1918714/+attachment/5475886/+files/0001-CIFS-Close-open-handle-after-interrupted-close.patch

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https://bugs.launchpad.net/bugs/1918714

Title:
  Fix close/open corner cases

Status in linux package in Ubuntu:
  Invalid
Status in linux-azure-4.15 package in Ubuntu:
  New
Status in linux source package in Bionic:
  New
Status in linux-azure-4.15 source package in Bionic:
  In Progress

Bug description:
  SRU Justification

  [Impact]
  Microsoft has asked for these 3 patches to be applied to the linux-azure-4.15 
kernel.
  The code has changed significantly from 4.15 to 5.6, so the patches are
  quite different then current upstream. Hopefully I've captured the intent
  if not the function in those patches.

  [1] - Correct corner case where a close operation does not complete.
  [2] - Fix a race when an OPEN is cancelled.
  [3] - Fix a panic when allocating memory when a spinlock is held.

  
  [Test Case]
  none

  [Potential regression]
  These patches are all intended to accommodate boundary conditions. You 
shouldn't
  experience any regression under normal use.

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