[libvirt-users] cgroup error starting domains

[Daniel P. Berrange]

On Thu, Jun 06, 2013 at 06:26:23PM +0200, Matteo Bernardini wrote:
> On 05/22/2013 11:01 AM, Matteo Bernardini wrote:
> > Hi,
> > 
> > I've got a small problem using libvirt-1.0.5.1 (with the latest patch in
> > the v1.0.5-maint branch on git added).
> > I'm using slackware64-14.0 but the situation is exactly the same described
> > on a debian bug
> > 
> > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=707201
> > 
> > When trying to start a domain I got
> > 
> > error: Failed to start domain debian-wheezy-xfce
> > error: Unable to initialize /machine cgroup: Invalid argument
> > 
> > with this in libvirtd.log
> > 
> > virCgroupDetect:373 : Failed to detect mounts for /machine
> > qemuInitCgroup:425 : Unable to initialize /machine cgroup: Invalid argument
> > 
> > and the error goes away if I unmount /sys/fs/cgroup.
> > 
> > Reverting to 1.0.4 fixes this,
> 
> sorry, just to report the same effect with 1.0.6: this is my
> /sys/fs/cgroup layout
> 
> http://pastebin.com/Gxsgb8KG
> 
> and this is the corresponding stuff in /var/lib/libvirt/libvirtd.log
> (with log level 1) when I issue a
> 
> # virsh start s64cont
> 
> http://pastebin.com/Rhg3tSzt
> 
> 
> as I've had a look at
> 
> http://libvirt.org/cgroups.html
> 
> I'm just wondering if systemd is necessary (we don't have it in
> Slackware) or I'm simply missing something...

No, systemd is definitely /not/ mandatory.  Can you provide your
/proc/mounts file contents

Libvirt seems to be failing to detect the mount points

2013-06-06 15:49:37.688+0000: 29305: debug : virCgroupNewPartition:1248 : path=/machine create=1 controllers=5f
2013-06-06 15:49:37.688+0000: 29305: debug : virCgroupNew:808 : parent=(nil) path=/machine controllers=95
2013-06-06 15:49:37.688+0000: 29305: debug : virCgroupDetect:359 : group=0x7f601007f6e0 controllers=95 path=/machine parent=(nil)
2013-06-06 15:49:37.688+0000: 29305: error : virCgroupDetect:366 : Failed to detect mounts for /machine
2013-06-06 15:49:37.688+0000: 29305: error : qemuInitCgroup:733 : Unable to initialize /machine cgroup: Invalid argument


also do you have anything in /etc/libvirt/qemu.conf set for the
cgroups controllers setting ?

Daniel
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