[libvirt-users] snapshot create error, unable to find cgroup for vm

[Eric Blake]

On 05/15/2013 10:32 PM, Gao Yongwei wrote:
>>> Are you using RHEL? If so, please open a support incident with Red Hat.
>>>>  If not, can you reproduce the problem when you upgrade to libvirt 1.0.5?
>>>>
>>>> Hello Blake ,I am using  CentOS6.4 ,but I got this trouble in
>>> my production environment .
>>> I will test 1.0.5 later ,now I am  very worried ;(
>>>
>>> Hello Blake, I've submited a new bug :
>> https://bugzilla.redhat.com/show_bug.cgi?id=963514
>> thanks.
>>
> Hello Blake ,here are some debug log info : http://paste.ubuntu.com/5669714/

An ubuntu pastebin for a CentOS issue seems a bit... odd.
Unfortunately, pastebins tend to expire, so linking to them in mail
isn't always the most reliable, compared to just pasting relevant
sections inline.


2013-05-16 04:08:11.063+0000: 21636: debug :
qemuDomainObjBeginJobInternal:813 : Starting async job: snapshot
2013-05-16 04:08:11.103+0000: 21636: debug : virFileClose:72 : Closed fd 23
2013-05-16 04:08:11.103+0000: 21636: debug : virCgroupNew:617 : New
group /libvirt/qemu/testvm
2013-05-16 04:08:11.105+0000: 21636: debug : virCgroupDetect:273 :
Detected mount/mapping 0:cpu at /cgroup/cpu in
2013-05-16 04:08:11.105+0000: 21636: debug : virCgroupDetect:273 :
Detected mount/mapping 1:cpuacct at /cgroup/cpuacct in
2013-05-16 04:08:11.105+0000: 21636: debug : virCgroupDetect:273 :
Detected mount/mapping 2:cpuset at /cgroup/cpuset in
2013-05-16 04:08:11.105+0000: 21636: debug : virCgroupDetect:273 :
Detected mount/mapping 3:memory at /cgroup/memory in
2013-05-16 04:08:11.105+0000: 21636: debug : virCgroupDetect:273 :
Detected mount/mapping 4:devices at /cgroup/devices in
2013-05-16 04:08:11.105+0000: 21636: debug : virCgroupDetect:273 :
Detected mount/mapping 5:freezer at /cgroup/freezer in
2013-05-16 04:08:11.105+0000: 21636: debug : virCgroupDetect:273 :
Detected mount/mapping 6:blkio at /cgroup/blkio in
2013-05-16 04:08:11.105+0000: 21636: debug : virCgroupMakeGroup:535 :
Make group /libvirt/qemu/testvm
2013-05-16 04:08:11.105+0000: 21636: debug : virCgroupMakeGroup:560 :
Make controller /cgroup/cpu/libvirt/qemu/testvm/
2013-05-16 04:08:11.106+0000: 21636: error :
qemuDomainSnapshotCreateDiskActive:11299 : internal error Unable to find
cgroup for testvm
2013-05-16 04:08:11.106+0000: 21636: debug : qemuProcessStartCPUs:2825 :
Using lock state '(null)'

At this point, all I can say is that our logging for cgroups is LOUSY.
Can you retry with the just-released 1.0.5.1 or even libvirt.git, as it
makes no sense trying to debug stale versions unless we can prove the
problem also affects the latest?  There have been some recent cgroups
patches.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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