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[Qemu-devel] [Bug 1426472] Re: Recent regression: segfault on startup wi

From: Stefan Hajnoczi
Subject: [Qemu-devel] [Bug 1426472] Re: Recent regression: segfault on startup with -snapshot
Date: Mon, 11 May 2015 12:52:08 -0000

I believe this was resolved in:

commit 6b49809c597331803ea941eadda813e5bb4e8fe2
Author: Paolo Bonzini <address@hidden>
Date:   Fri Feb 27 19:58:23 2015 +0100

    cpus: fix deadlock and segfault in qemu_mutex_lock_iothread

The problem cannot be reproduced in qemu.git/master

** Changed in: qemu
       Status: In Progress => Fix Released

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  Recent regression: segfault on startup with -snapshot

Status in QEMU:
  Fix Released

Bug description:
  As of git revision 041ccc922ee474693a2869d4e3b59e920c739bc0, qemu
  segfaults on startup when I try to boot a hard disk image with the
  -snapshot option.

  To reproduce:

    wget http://wiki.qemu.org/download/linux-0.2.img.bz2
    bunzip2 linux-0.2.img.bz2 
    qemu-system-i386 -hda linux-0.2.img -snapshot

  When I run this, qemu-system-i386 crashes with a segmentation fault.
  This is on a Debian 7 amd64 host.

  git bisect implicates the following commit:

  commit a464982499b2f637f6699e3d03e0a9d2e0b5288b
  Author: Paolo Bonzini <address@hidden>
  Date:   Wed Feb 11 17:15:18 2015 +0100

      rcu: run RCU callbacks under the BQL

      This needs to go away sooner or later, but one complication is the
      complex VFIO data structures that are modified in instance_finalize.
      Take a shortcut for now.

      Reviewed-by: Michael Roth <address@hidden>
      Tested-by: Michael Roth <address@hidden>
      Signed-off-by: Paolo Bonzini <address@hidden>

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