Bug 963514 - Cannot create snapshot ,Unable to find cgroup for vm
Cannot create snapshot ,Unable to find cgroup for vm
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: libvirt (Show other bugs)
x86_64 Linux
unspecified Severity high
: rc
: ---
Assigned To: Libvirt Maintainers
Virtualization Bugs
Depends On:
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Reported: 2013-05-15 23:02 EDT by xingxing
Modified: 2013-05-23 05:08 EDT (History)
9 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2013-05-20 06:16:42 EDT
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
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Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description xingxing 2013-05-15 23:02:58 EDT
Description of problem:
After cgconfig service restarted and libvirtd restarted ,could not create snapshot for vm.

Version-Release number of selected component (if applicable):
# uname -r
# rpm -q libvirt
# rpm -q qemu-kvm-rhev

How reproducible:

Steps to Reproduce:
1.service cgconfig restart
2.service libvirtd restart
3.virsh snapshot-create-as testvm s1 --disk-only
Actual results:
error: internal error Unable to find cgroup for cho2013051600036
in libvirtd.log:
2013-05-16 02:53:02.062+0000: 16157: error : qemuDomainSnapshotCreateDiskActive:11299 : internal error Unable to find cgroup for testvm
in /cgroup there no cgroup config for testvm.

Expected results:
create snapshot success.

Additional info:
Comment 1 xingxing 2013-05-15 23:05:36 EDT
cho2013051600036 is another vm's name ,the error message is:
error: internal error Unable to find cgroup for testvm
Comment 3 Jiri Denemark 2013-05-20 06:16:42 EDT
I don't think restarting cgconfig service is something we want to support unless there's a real reason for doing that. If you restart cgconfig service, all cgroups are removed and all tasks are moved to the root cgroup.

I'm closing this as not a bug, but feel free to reopen if there is a real situation in which cgconfig service needs to be restarted.
Comment 4 Daniel Berrange 2013-05-20 06:27:09 EDT
If anything this is really broken behaviour of cgconfig. Nothing should ever unilaterally delete the cgroups hierarchy once the system has booted.

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