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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

I built a Wily test kernel with a cherry pick of the two requested
commits.  The test kernel can be downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1520411/

Can you test this kernel an see if it resolves this bug?

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https://bugs.launchpad.net/bugs/1520411

Title:
  powerpc/tm: Fix local DoS

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Trusty:
  In Progress
Status in linux source package in Vivid:
  In Progress
Status in linux source package in Wily:
  In Progress
Status in linux source package in Xenial:
  Confirmed

Bug description:
  The following two fixes have just made it into mpes powerpc fixes
  tree:

    7f821fc powerpc/tm: Check for already reclaimed tasks
    d2b9d2a powerpc/tm: Block signal return setting invalid MSR state

  They fix local DoS  (userspace can crash the OS) on powerpc POWER8
  cpus for any kernel v3.9+

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