[libvirt-users] Could not destroy domain, current job is remoteDispatchConnectGetAllDomainStats

[Serhii Kharchenko]

Hello libvirt-users list,

We're catching the same bug since 3.4.0 version (3.3.0 works OK).
So, we have process that is permanently connected to libvirtd via socket
and it is collecting stats, listening to events and control the VPSes.

When we try to 'shutdown' a number of VPSes we often catch the bug. One of
VPSes sticks in 'in shutdown' state, no related 'qemu' process is present,
and there is the next error in the log:

Jan 17 13:54:20 server1 libvirtd[20437]: 2018-01-17 13:54:20.005+0000:
20438: warning : qemuGetProcessInfo:1460 : cannot parse process status data
Jan 17 13:54:20 server1 libvirtd[20437]: 2018-01-17 13:54:20.006+0000:
20441: error : virFileReadAll:1420 : Failed to open file
'/sys/fs/cgroup/cpu,cpuacct/machine.slice/machine-qemu\x2d36\x2dDOMAIN1.scope/cpuacct.usage':
No such file or directory
Jan 17 13:54:20 server1 libvirtd[20437]: 2018-01-17 13:54:20.006+0000:
20441: error : virCgroupGetValueStr:844 : Unable to read from
'/sys/fs/cgroup/cpu,cpuacct/machine.slice/machine-qemu\x2d36\x2dDOMAIN1.scope/cpuacct.usage':
No such file or directory
Jan 17 13:54:20 server1 libvirtd[20437]: 2018-01-17 13:54:20.006+0000:
20441: error : virCgroupGetDomainTotalCpuStats:3319 : unable to get cpu
account: Operation not permitted
Jan 17 13:54:23 server1 libvirtd[20437]: 2018-01-17 13:54:23.805+0000:
20522: warning : qemuDomainObjBeginJobInternal:4862 : Cannot start job
(destroy, none) for domain DOMAIN1; current job is (query, none) owned by
(20440 remoteDispatchConnectGetAllDomainStats, 0 <null>) for (30s, 0s)
Jan 17 13:54:23 server1 libvirtd[20437]: 2018-01-17 13:54:23.805+0000:
20522: error : qemuDomainObjBeginJobInternal:4874 : Timed out during
operation: cannot acquire state change lock (held by
remoteDispatchConnectGetAllDomainStats)

I think only the last line matters.
The bug is highly reproducible. We can easily catch it even when we call
multiple 'virsh shutdown' in shell one by one.

When we shutdown the process connected to the socket - everything become OK
and the bug is gone.

The system is used is Gentoo Linux, tried all modern versions of libvirt
(3.4.0, 3.7.0, 3.8.0, 3.9.0, 3.10.0, 4.0.0-rc2 (today's version from git))
and they have this bug. 3.3.0 works OK.

Thanks for any help in advance.
We can send any additional info if needed.

~Serhii
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