[libvirt] virsh hangs

[Daniel P. Berrange]

On Tue, Jun 23, 2009 at 06:22:34AM -0700, Garry Dolley wrote:
> My system:
> 
> Ubuntu Jaunty 9.04
> 
> libvirt 0.6.4
> kvm 0.8.4
> qemu 0.10.0
> 
> I'm not sure what triggered this, I was working with several VMs,
> and then found that virsh decided to hang:
> 
> garry at kvr02:~$ virsh list
> Connecting to uri: qemu:///system
> <hang>
> 
> I have to ^C out of it.
> 
> If I 'force-stop' and then 'start' libvirt-bin:
> 
> garry at kvr02:~$ sudo /etc/init.d/libvirt-bin force-stop
>  * Forcefully stopping libvirt management daemon libvirtd
>    ...done.
> garry at kvr02:~$ sudo /etc/init.d/libvirt-bin start
>  * Starting libvirt management daemon libvirtd
>    ...done.
> 
> I can then get something:
> 
> garry at kvr02:~$ virsh list
> Connecting to uri: qemu:///system
>  Id Name                 State
> ----------------------------------
>   1 vm1                  running
>   4 s3-lax               running
>  14 freebsd-test         running
>  19 freebsd-2            running
> <hang>
> 
> But it hangs after that 4th one.  I must ^C it again.
> 
> If I do 'virsh list' again, it'll then show nothing (hangs like it
> does above).
> 
> Any suggestions?

Install the -debug packages for libvirt, and get a trace
of all its threads under GDB, eg

  (gdb) thread apply all backtrace


Also, capture traces of the client & server, by setting LIBVIRT_DEBUG=1
before running each.


Daniel
-- 
|: Red Hat, Engineering, London   -o-   http://people.redhat.com/berrange/ :|
|: http://libvirt.org  -o-  http://virt-manager.org  -o-  http://ovirt.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: GnuPG: 7D3B9505  -o-  F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|