[Pkg-libvirt-maintainers] Bug#848317: Bug#848317: not arch dependent but racy

[Christian Ehrhardt]

I was setting up a VM independent of autopkgtests to debug this further,
but so far only confirmed what I had already:
Yet as documentation if we later on need to refer to that data:

Logs of journalctl -fex and the libvirt log on sl guest when doing the
killing restart

# Before:
$ virsh list --all
 Id    Name                           State
----------------------------------------------------
 3807  sl                             running

# Then on restart
$ /etc/init.d/libvirtd restart

# /var/log/libvirt/lxc/sl.log:
 3807: info : hostname: zesty-test-smoke-lxc
 3807: error : virNetSocketReadWire:1801 : End of file while reading data:
Input/output error

# journalctl -fex:
[...] normal stopping / starting message - then after "libvirtd.service has
finished starting up":
 libvirtd[4073]: internal error: No valid cgroup for machine sl
 audit[4125]: AVC apparmor="STATUS" operation="profile_remove"
profile="unconfined" name="libvirt-354e2b39-9c30-4080-9323-23d27f8d2cf8"
pid=4125 comm="apparmor_parser"
 kernel: audit: type=1400 audit(1482226905.416:21): apparmor="STATUS"
operation="profile_remove" profile="unconfined"
name="libvirt-354e2b39-9c30-4080-9323-23d27f8d2cf8" pid=4125
comm="apparmor_parser"
 libvirtd[4073]: End of file while reading data: Input/output error


# The guest appears as shut off now (sometimes I have to restart twice to
get the guest listed here again):
$ virsh list --all
 Id    Name                           State
----------------------------------------------------
 -     sl                             shut off


So the "root cause" still appears as: "internal error: No valid cgroup for
machine sl"
After that it is on the kill path, removing the profile but no other error
shows up.

I saved some /etc/libvirt and cgroup info.
But no content in any of those changed between bad case (after first
restart) and good case (after staring the guest once again).

I don't see where it is "fixing itself up" after starting the guest again
:-/
And I'd have hoped that this would be my entry point to find a fix.
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