[pkg-apparmor] Bug#954655: apparmor autopkgtest doesn't work nice on ci.d.n infrastructure

[intrigeri]

Hi,

intrigeri (2021-02-06):
> I understand the LXC container is stopped and restarted between each
> test, so what Paul wrote above suggests the container is successfully
> stopped between the 1st and 2nd test, same between the 2nd and 3rd
> test, but then it occasionally fails to stop after the last
> (3rd) test. Correct?
>
> If this analysis is correct, then the culprit has to be in the 3rd
> test i.e.:
>
>   # Dummy test so that changes to linux-image-amd64 trigger our other autopkgtests
>   # on ci.debian.net
>   Test-Command: /bin/true
>   Depends: linux-image-amd64 [amd64] | linux-image-generic [ amd64 ]
>   Restrictions: superficial, skip-not-installable
>
> … and this is the one I should mark it as isolation-machine,
> so we can resume running the other 2 tests on ci.d.n,
> which I would very much like.
>
> Makes sense?

Actually, apparmor-profiles-extra has the exact same test, and AFAICT
it seems to run pretty reliably there, so I now have doubts about the
hypothesis I quoted above.

Still, perhaps it's worth trying to add isolation-machine to that
test, remove src:apparmor from the blocklist, and see what happens?

Cheers!