Permission to disk set wrong when restoring from memory snapshot?

[Liran Rotenberg]

Hi all,
Passing on Bug 1840609 <https://bugzilla.redhat.com/show_bug.cgi?id=1840609>
- Wake up from hibernation failed:internal error: unable to execute QEMU
command 'cont': Failed to get "write" lock.

In Ovirt/RHV there is a specific flow that prevents the VM from starting on
the first host.
The result is:
2020-06-09T12:12:58.111610Z qemu-kvm: Failed to get "write" lock
Is another process using the image
[/rhev/data-center/3b67fb92-906b-11ea-bb36-482ae35a5f83/4fd23357-6047-46c9-aa81-ba6a12a9e8bd/images/0191384a-3e0a-472f-a889-d95622cb6916/7f553f44-db08-480e-8c86-cbdeccedfafe]?
2020-06-09T12:12:58.668140Z qemu-kvm: terminating on signal 15 from pid
177876 (<unknown process>)
We have a rerun mechanism. Therefore the VM starts again on another host if
available. On the second try the VM does succeed to run.

After looking in the debug logs (attached in the bug), I have seen this on
the first host:
2020-06-09 12:12:46.288+0000: 177879: debug :
qemuSetupImageCgroupInternal:139 : Not updating cgroups for disk path
'<null>', type: file
2020-06-09 12:12:46.288+0000: 177879: debug : qemuSetupImagePathCgroup:75 :
Allow path
/rhev/data-center/3b67fb92-906b-11ea-bb36-482ae35a5f83/4fd23357-6047-46c9-aa81-ba6a12a9e8bd/images/0191
384a-3e0a-472f-a889-d95622cb6916/7f553f44-db08-480e-8c86-cbdeccedfafe,
perms: rw

*2020-06-09 12:12:46.288+0000: 177879: debug : qemuSetupImagePathCgroup:75
: Allow path
/rhev/data-center/mnt/yellow-vdsb.qa.lab.tlv.redhat.com:_Compute__NFS_GE_compute-ge-4_nfs__0/4fd23357-6047-46c9-aa81-ba6a12a9e8bd/images/0191384a-3e0a-472f-a889-d95622cb6916/7f553f44-db08-480e-8c86-cbdeccedfafe,
perms: r*

And immediately after retry on the second host:
2020-06-09 12:13:01.839+0000: 15781: debug : qemuSetupImagePathCgroup:75 :
Allow path /rhev/data-center/mnt/yellow-vdsb.qa.lab.tlv.redhat.com:_Compute__NFS_GE_compute-ge-4_nfs__0/4fd23357-60
47-46c9-aa81-ba6a12a9e8bd/images/0191384a-3e0a-472f-a889-d95622cb6916/7f553f44-db08-480e-8c86-cbdeccedfafe,
perms: rw

Is it intended and might cause the QEMU error?

Regards,
Liran.
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