CentOS guest crashing due to assertion failure in qemu-char.c

[Wesley Holevinski]

Here is the log in /var/log/libvirt/qemu/centos_heavy.log

qemu-kvm: /builddir/build/BUILD/qemu-kvm-0.12.1.2/qemu-char.c:630: io_watch_poll_finalize: Assertion `iwp->src == ((void *)0)' failed.
2014-01-13 16:50:31.576+0000: shutting down

The code it's failing the assertion on has an interesting comment:

    static void io_watch_poll_finalize(GSource *source)
    {
    /* Due to a glib bug, removing the last reference to a source
    * inside a finalize callback causes recursive locking (and a
    * deadlock). This is not a problem inside other callbacks,
    * including dispatch callbacks, so we call io_remove_watch_poll
    * to remove this source. A t this point, iwp->src must
    * be NULL, or we would leak it.
    *
    * This would be solved much more elegantly by child sources,
    * but we support older glib versions that do not have them.
    */
    IOWatchPoll *iwp = io_watch_poll_from_source(source);
    assert(iwp->src == NULL);
    }

------
CPU Info:

http://pastebin.com/U7MrzFxK

--------

Relevant RPM versions:

qemu-kvm-0.12.1.2-2.415.el6_5.3.x86_64
libvirt-0.10.2-29.el6_5.2.x86_64

--------

Domain config:

http://pastebin.com/Nf2VsER8

(Note the use of the vmchannels; I believe this is playing a part in this crash)

---------

uname -a:

Linux blizzard 2.6.32-431.3.1.el6.x86_64 #1 SMP Fri Jan 3 21:39:27 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

---------

CLI to start guest (included in attached dump):

http://pastebin.com/W01Xzyb0

---------

thread apply all bt:

http://pastebin.com/FTpUDU7A

[Thomas Huth (th-huth)]

QEMU 0.12 is completely outdated nowadays ... can you still reproduce this problem with the latest version of QEMU?

[Paolo Bonzini (bonzini)]

It's a glib bug. It's fixed in RHEL 6.9 beta and in due time the fix will get to CentOS.

[Paolo Bonzini (bonzini)]

https://bugzilla.redhat.com/show_bug.cgi?id=1212722