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Re: [libvirt] 1.2.0 segfault on Centos 6



On 02/04/2014 09:02 AM, Franky Van Liedekerke wrote:
> Hi,
> 
> using libvirt 1.2.0 on a up-to-date Centos6.5 machine leads to
> occasional segmentation faults (see below).
> Sometimes it runs for 5 minutes, sometimes for an hour, but after that
> the result is always the same: segfault after some weird qom-list, that
> apparently the qemu version on centos doesn't know. Has 1.2.1 a known
> fix for this?
> 
> Franky (debug log of last crash is below the dotted line)
> 
> -------------------------------------------------
> 
> 2014-02-04 15:50:27.351+0000: 9082: error :
> qemuMonitorJSONCheckError:354 : internal error: unable to execute QEMU
> command 'qom-list': The command qom-list has not been found
> Caught Segmentation violation dumping internal log buffer:
> 

Sounds to me like poor fallback - a patch in libvirt was tested against
a newer version of qemu that provides qom-list, but doesn't gracefully
handle older qemu where it doesn't work.

Are you in a position to bisect which libvirt patch introduced the
problem?  It looks like our first use of qom-list was in 1.1.1, with
commit d76a897.


> 2014-02-04 15:50:27.351+0000: 9082: error :
> qemuMonitorJSONCheckError:354 : internal error: unable to execute QEMU
> command 'qom-list': The command qom-list has not been found
> 
> 

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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