[libvirt-users] Using qemu active blockcommit results in 'Permission denied' error

[Marcus Hoffmann]

On May 31, 2019 2:03:40 PM GMT+02:00, Marcus Hoffmann <bubu at bubu1.eu> wrote:
>Hi Peter,
>
>On 31.05.19 09:57, Peter Krempa wrote:
>> On Thu, May 30, 2019 at 22:12:14 +0200, Marcus Hoffmann wrote:
>>> Hello all,
>> 
>> Hi,
>> 
>>>
>>> I tried following this guide:
>>>
>https://wiki.libvirt.org/page/Live-disk-backup-with-active-blockcommit
>>>
>>> Unfortunately when I try to do the final virsh blockcommit step I
>always
>>> get the following error:
>>>
>>> error: internal error: unable to execute QEMU command
>'block-commit':
>>> Could not reopen file: Permission denied
>>>
>>> I checked directory und image file permissions, app-armor profiles
>(set
>>> to complain mode for now.) and libvirt logs but nothing there gives
>me
>>> any hints what might be going wrong.
>>>
>>> This is on a debian buster system, using
>> 
>> I was doing some changes in the blockcommit code recently so I might
>> have messed something up. Could you please collect debug logs:
>> 
>> https://wiki.libvirt.org/page/DebugLogs
>> 
>> when the problem reproduces and also a directory listing of the path
>> where the image is stored so I can check if the permission code is
>> working properly.
>> 
>
>
>Logfile attached.
>
>~ # ls -al /var/lib/libvirt/images/
>total 1271917588
>drwxr-xr-x 2 root         root                 4096 Mai 29 14:47 .
>drwxr-xr-x 7 root         root                 4096 Mai 27 15:55 ..
>-rw-r--r-- 1 libvirt-qemu libvirt-qemu 214821961728 Mai 29 14:47
>drache3.qcow2
>-rw-r--r-- 1 libvirt-qemu libvirt-qemu 395671371776 Mai 29 14:47
>drache_addon.qcow2
>-rw-r--r-- 1 libvirt-qemu libvirt-qemu  90944765952 Mai 31 14:02
>drache_overlaya.qcow2
>-rw-r--r-- 1 libvirt-qemu libvirt-qemu 115860766720 Mai 31 14:02
>drache_overlayb.qcow2
>
>Marcus

Hi Peter,

did you get the logfile I sent? (Just wanting to make sure the email actually got delivered. I get a lot of dmarc failures from the mailing list :-/)

Did you have a chance to take a look?

Best,
Marcus