---------- Forwarded message ----------
From: "Trey Dockendorf" <treydock@gmail.com>
Date: Oct 24, 2011 12:31 AM
Subject: Re: [libvirt-users] Unable to acquire lock
To: "Jatin Kumar" <cs5090243@cse.iitd.ernet.in>

On Mon, Oct 24, 2011 at 12:05 AM, Jatin Kumar <cs5090243@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@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

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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