Re: [libvirt] Loosing lxc guests when restarting libvirt

On Sat, Dec 24, 2016 at 05:14:44PM +0100, Guido Günther wrote: > Hi Cedric,x > On Wed, Dec 21, 2016 at 02:36:39PM +0100, Cedric Bosdonnat wrote: > > Hey Christian, > > > > On Tue, 2016-12-20 at 12:29 +0100, Christian Ehrhardt wrote: > > > Hi, > > > I found an issue in libvirt related to libvirt-lxc, but fail to find the root cause. > > > > > > The TL;DR is: libvirt-lxc guests get killed on libvirt restart due to "internal error: No valid cgroup for > > > machine" > > > > > > It was able to reproduce libvirt 1.3.1, 2.4 and 2.5 as packages in Ubuntu and Debian. > > > I wanted to ask for two things: > > > - wider coverage where this does reproduce > > > > I couldn't reproduce here with openSUSE Tumbleweed and libvirt 2.5 packages. > > I had a short look and it seems like this sequence is killing all running > libvirt-lxc guests reliably: > >   # no lxc guest running yet >   export LIBVIRT_DEFAULT_URI=lxc:/// >   DOMAIN=sl >   systemctl daemon-reload > >   # start lxc guest >   virsh start ${DOMAIN} >   sleep 1  # give vm some time to start >   systemctl restart libvirtd Using ftrae I can see that systemd moves the process into the wrong cgroup on start: systemd-1     [000] ....   652.333068: cgroup_attach_task: dst_root=3 dst_id=80 dst_level=2 dst_path=/system.slice/libvirtd.service pid=4073 comm=libvirt_lxc systemd-1     [000] ....   652.333117: cgroup_attach_task: dst_root=3 dst_id=80 dst_level=2 dst_path=/system.slice/libvirtd.service pid=4073 comm=libvirt_lxc systemd-1     [000] ....   652.333160: cgroup_attach_task: dst_root=6 dst_id=80 dst_level=2 dst_path=/system.slice/libvirtd.service pid=4073 comm=libvirt_lxc systemd-1     [000] ....   652.333203: cgroup_attach_task: dst_root=4 dst_id=107 dst_level=2 dst_path=/system.slice/libvirtd.service pid=4073 comm=libvirt_lxc systemd-1     [000] ....   652.333245: cgroup_attach_task: dst_root=8 dst_id=80 dst_level=2 dst_path=/system.slice/libvirtd.service pid=4073 comm=libvirt_lxc systemd-1     [000] ....   652.333286: cgroup_attach_task: dst_root=7 dst_id=84 dst_level=2 dst_path=/system.slice/libvirtd.service pid=4073 comm=libvirt_lxc I've attached the script to reproduce this and would be happy about ideas of the root cause.