[Pkg-libvirt-maintainers] Bug#983871: Bug#983871: error: internal error: failed to get cgroup backend for 'pathOfController'

[Jonas Schäfer]

Hi,

On Mittwoch, 17. November 2021 23:24:14 CET you wrote:
> > I did another test by pinning the bookworm packages (7.6.0-1) and testing
> > those. They exhibit the same behaviour as the patched libvirt, that is: in
> > some cases, virsh destroy will show an error, but the container will be
> > removed cleanly nonetheless.
> 
> That's kind of odd, the version in bookworm should fix this issue because
> it has been fixed on upstream version 7.3.0. And I can't reproducible this
> bug again because I don't use LXC on libvirt quite heavily.

So I did more tests. I ran a destroy/create loop on a bookworm box. However, 
due to time constraints, I wasn't able set up any complex thing inside the 
container, so it's possible that that skewed the results. In these tests, I 
was not able to reproduce the issue. To me: that indicates one of two things:

(a) The second issue can only occur with LXC and with reasonably complex 
guests -- I think that is not unrealistic because we're talking nested cgroups 
here, which wouldn't occur with qemu or with simple containers.

(b) The second issue only occurs on boxes which mix bookworm (or patched 
libvirt) and bullseye in undefined ways.

Unfortunately, I currently do not have a test system with complex containers 
at hand which I can upgrade to bookworm on the spot.

kind regards,
Jonas