libvirt users - Sep 2012 - Reg: Libvirt API does not return, after qemu-kvm is hungup.

Hi All,

   I am facing the following issue, while using Libvirt version 0.8.4.
(1) Libvirt API does not return, since the qemu-kvm process is hung up.

Based on the information available on mail thread
*https://bugzilla.redhat.com/show_bug.cgi?id=676205* (comment 26 - scenario
1),
this has been fixed in later version of Libvirt, specifically in RHEL
6.2(libvirt 0.9.4).

I have checked the changelogs between version 0.8.7(RHEL 6.1) & 0.9.4 and
was not able to identify the related patch information.

Please let me know, If I am looking at the wrong version for this fix?

Any help in this regard, would be useful.

Thanks,
Alphonse

Comment reference:
--SNIP--

1. The QEMU process has hung.

        QEMU won't respond to monitor commands. The API call making
the first monitor command will wait forever, any subsequent API calls
issuing monitor commands will timeout after ~30 seconds with this
libvirt error message.

        This is expected behaviour when QEMU has hung.

--SNIP--

In RHEL-6.2 we have done a number of things to address / mitigate these problems

 - It is now always possible to destroy a guest, even if the monitor
is stuck. This lets you destroy a guest in scenario 1, which is not
always possible with RHEL-5 libvirt, without restarting libvirtd.

--SNIP--

--EOF--
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On 09/10/2012 11:43 AM, Alphonse Hansel Anthony wrote:
> Hi All,
> 
>    I am facing the following issue, while using Libvirt version 0.8.4.
> (1) Libvirt API does not return, since the qemu-kvm process is hung up.
> 
> Based on the information available on mail thread
> *https://bugzilla.redhat.com/show_bug.cgi?id=676205* (comment 26 - scenario
> 1),
> this has been fixed in later version of Libvirt, specifically in RHEL
> 6.2(libvirt 0.9.4).
> 
> I have checked the changelogs between version 0.8.7(RHEL 6.1) & 0.9.4
and
> was not able to identify the related patch information.
> 
> Please let me know, If I am looking at the wrong version for this fix?
If you are using RHEL, you may want to open a service ticket with Red
Hat, as then you will get better support than by asking here.  That
said, why are you even worrying about RHEL 6.1 or RHEL 6.2, now that
RHEL 6.3 is out?
> In RHEL-6.2 we have done a number of things to address / mitigate these
problems
> 
>  - It is now always possible to destroy a guest, even if the monitor
> is stuck. This lets you destroy a guest in scenario 1, which is not
> always possible with RHEL-5 libvirt, without restarting libvirtd.
This particular comment appears to be referring to upstream commit
597fe3c (and several other related commits at the time), applied
upstream for 0.9.5.  And looking at the .srpm for RHEL 6.2, this patch
is among the set of patches backported to the RHEL 6.2 build, in
response to https://bugzilla.redhat.com/show_bug.cgi?id=692663

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

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