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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
trusty' to 'verification-done-trusty'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-trusty

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https://bugs.launchpad.net/bugs/1413129

Title:
  [trusty] btrfs: reboot/crash when running xfs btrfs tests 035

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Trusty:
  Fix Committed

Bug description:
  Running xfs btrfs specific tests 035 with various mount options with 7
  target btrfs devices causes the kernel to crash when running inside a
  virtual machine.   Bisecting tracked the fix down to commit
  00fdf13a2e9f313a044288aa59d3b8ec29ff904a:

  Author: Liu Bo <bo.li.liu@xxxxxxxxxx>
  Date:   Mon Mar 10 18:56:07 2014 +0800

      Btrfs: fix a crash of clone with inline extents's split

      xfstests's btrfs/035 triggers a BUG_ON, which we use to detect the split
      of inline extents in __btrfs_drop_extents().

      For inline extents, we cannot duplicate another EXTENT_DATA item, because
      it breaks the rule of inline extents, that is, 'start offset' needs to be 0.

      We have set limitations for the source inode's compressed inline extents,
      because it needs to decompress and recompress.  Now the destination inode's
      inline extents also need similar limitations.

      With this, xfstests btrfs/035 doesn't run into panic.

      Signed-off-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
      Signed-off-by: Chris Mason <clm@xxxxxx>

  SRU Justification:

  [Impact]
  Running standard btrfs test 035 will cause a machine to reboot.

  [Fix]
  commit 00fdf13a2e9f313a044288aa59d3b8ec29ff904a
   Btrfs: fix a crash of clone with inline extents's split

  [Testcase]
  Run xfs "btrfs specific" test 35 with 7 devices for the btrfs scratch pool. Run with all mount options. Without the fix, the machine reboots. With the fix, one can run this multiple times w/o a reboot.

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