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

[Launchpad Bug Tracker]

This bug was fixed in the package qemu - 2.0.0+dfsg-2ubuntu1.31

---------------
qemu (2.0.0+dfsg-2ubuntu1.31) trusty; urgency=medium

  * aio: fix qemu_bh_schedule() bh->ctx race condition (LP: #1640382)
    - d/p/0001-aio-fix-qemu_bh_schedule-bh-ctx-race-condition.patch
  * aio: strengthen memory barriers for bottom half scheduling
    (LP: #1587039)
    - d/p/0002-aio-strengthen-memory-barriers-for-bottom-half-sched.patch

 -- Seyeong Kim <seyeong.kim at canonical.com>  Thu, 24 Nov 2016 10:44:55
+0100

** Changed in: qemu (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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

Title:
  Segfault event notifier because of race condition

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive icehouse series:
  Fix Committed
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Trusty:
  Fix Released

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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