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

[Seyeong Kim]

ii  qemu                                 2.0.0+dfsg-2ubuntu1.31                amd64        fast processor emulator
ii  qemu-keymaps                         2.0.0+dfsg-2ubuntu1.31                all          QEMU keyboard maps
ii  qemu-system                          2.0.0+dfsg-2ubuntu1.31                amd64        QEMU full system emulation binaries
ii  qemu-system-arm                      2.0.0+dfsg-2ubuntu1.31                amd64        QEMU full system emulation binaries (arm)
ii  qemu-system-common                   2.0.0+dfsg-2ubuntu1.31                amd64        QEMU full system emulation binaries (common files)
ii  qemu-system-mips                     2.0.0+dfsg-2ubuntu1.31                amd64        QEMU full system emulation binaries (mips)
ii  qemu-system-misc                     2.0.0+dfsg-2ubuntu1.31                amd64        QEMU full system emulation binaries (miscelaneous)
ii  qemu-system-ppc                      2.0.0+dfsg-2ubuntu1.31                amd64        QEMU full system emulation binaries (ppc)
ii  qemu-system-sparc                    2.0.0+dfsg-2ubuntu1.31                amd64        QEMU full system emulation binaries (sparc)
ii  qemu-system-x86                      2.0.0+dfsg-2ubuntu1.31                amd64        QEMU full system emulation binaries (x86)
ii  qemu-user                            2.0.0+dfsg-2ubuntu1.31                amd64        QEMU user mode emulation binaries
ii  qemu-utils                           2.0.0+dfsg-2ubuntu1.31                amd64        QEMU utilities


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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:
  Fix Committed

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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