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[Launchpad Bug Tracker <1442180@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.16.0-34.47

---------------
linux (3.16.0-34.47) utopic; urgency=low

  [ Upstream Kernel Changes ]

  * powerpc/perf: Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH
    - LP: #1442180
 -- Luis Henriques <luis.henriques@xxxxxxxxxxxxx>   Fri, 10 Apr 2015 16:39:29 +0100

** Changed in: linux-lts-utopic (Ubuntu Trusty)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1442180

Title:
  powerpc/perf: Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH

Status in linux package in Ubuntu:
  In Progress
Status in linux-lts-utopic package in Ubuntu:
  Invalid
Status in linux source package in Trusty:
  Fix Released
Status in linux-lts-utopic source package in Trusty:
  Fix Released
Status in linux source package in Utopic:
  Fix Released
Status in linux-lts-utopic source package in Utopic:
  Invalid
Status in linux source package in Vivid:
  In Progress
Status in linux-lts-utopic source package in Vivid:
  Invalid

Bug description:
  Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH

  We cap 32bit userspace backtraces to PERF_MAX_STACK_DEPTH
  (currently 127), but we forgot to do the same for 64bit backtraces.

  If userspace creates a stack frame that points to itself we will
  loop forever in the backtrace code with interrupts off.

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