[libvirt] virsh hangs

[Garry Dolley]

On Tue, Jun 23, 2009 at 12:05:35PM -0700, Garry Dolley wrote:
> 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?
> 
> >From playing with this, I'm led to believe libvirt "remembers" some
> VM that I may have killed manually w/ 'kill'.  
> 
> Where does libvirt store what VMs it knows about across restarts?  I
> think I may need to manually poke around there and take out the bad
> VM...

crobinso in #virt (irc.oftc.net) helped me solve this.

The info about running VMs is kept across restarts in:

  /var/run/libvirt/qemu

There was a VM that went crazy, it totally hung, and I guess
something about it didn't sit well with virsh.  When I 'kill -9'
this VM (yes, 'kill' by itself didn't even work), then virsh didn't
hang anymore.

Problem solved.

(thankfully, the hanging VM was a throw-away one, so kill -9 was OK
in this case)

-- 
Garry Dolley
ARP Networks, Inc. | http://www.arpnetworks.com | (818) 206-0181
Data center, VPS, and IP Transit solutions
Member Los Angeles County REACT, Unit 336 | WQGK336
Blog http://scie.nti.st