[Bug 1640382] Re: Segfault event notifier because of race condition

[ChristianEhrhardt]

Per discussion with Seyeong Kim this should also apply to Ubuntu Cloud Archive Kilo.
This has the first but lacks the second fix.
He can work that out with the UCA Team.

** Also affects: cloud-archive
   Importance: Undecided
       Status: New

** Changed in: cloud-archive
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1640382

Title:
  Segfault event notifier because of race condition

Status in Ubuntu Cloud Archive:
  Confirmed
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Trusty:
  In Progress

Bug description:
  [Impact]

  Sometimes instance get crashed with segfault on event notifier

  gdb traceback is below[1]

  trying to do SRU with below commits[2][3]

  [Testcase]

  I can't provide the step to reproduce this issue

  but provided gdb backtrace for this.

  [Regeression Potential]

  Above patch is merged on 2014, and it's quite simple patch.

  [Other Info]

  related link attached

  [1] http://pastebin.ubuntu.com/23449623/

  [2] http://git.qemu.org/?p=qemu.git;a=commit;h=924fe1293c3e7a3c787bbdfb351e7f168caee3e9
  [3] http://git.qemu.org/?p=qemu.git;a=commit;h=df54f5efed9b3be7f40e14113cc1f13f5889e644 ( cherrypicked commit )

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