[libvirt-users] Fwd: Re: Unable to acquire lock

[Trey Dockendorf]

Accidentally sent to OP only.

This has been with 0.8.7 on CentOS 6 CR that Ive had the problem.
---------- Forwarded message ----------
From: "Trey Dockendorf" <treydock at gmail.com>
Date: Oct 24, 2011 12:31 AM
Subject: Re: [libvirt-users] Unable to acquire lock
To: "Jatin Kumar" <cs5090243 at cse.iitd.ernet.in>



On Mon, Oct 24, 2011 at 12:05 AM, Jatin Kumar
<cs5090243 at cse.iitd.ernet.in>wrote:

> Hello,
> I am trying to execute virsh commands on a host but it is giving errors
> due to failure in acquiring lock.
>
> root at kvm01:~# virsh suspend blindone
> error: Failed to suspend domain blindone
> error: Timed out during operation: cannot acquire state change lock
>
> Any suggestions how can we figure out possible reasons.
>
> --
> Jatin
>
> _______________________________________________
> libvirt-users mailing list
> libvirt-users at redhat.com
> https://www.redhat.com/mailman/listinfo/libvirt-users
>

I've run into this a few times when a snapshot hangs.  Unfortunately I can't
offer much advice on why it happens, but increasing log verbosity may help
troubleshoot it.  These are the relevant lines I use in
/etc/libvirt/libvirtd.conf

log_level = 2
log_filters="2:remote 2:event"
log_outputs="2:file:/var/log/libvirt/libvirtd.log"

Be careful with level 1 alerts...I generated a 100GB text log in 3 days.

To fix that problem and unlock a VM, you need to kill libvirt, remove the
PID files and start libvirt

# service libvirtd stop
# rm -rfv /var/run/libvirt
# service libvirtd start

More information here, https://bugzilla.redhat.com/show_bug.cgi?id=676205

- Trey
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