[pkg-lxc-devel] Bug#1010469: Bug#1010469: lxc: as root, lxc-start fails to start with cgroups/cgfsng error setting up limits for devices

[Julian Gilbey]

On Mon, May 15, 2023 at 10:37:32AM +0100, Julian Gilbey wrote:
> [...]
> But now we're back to the original problem cgfsng problem (running
> with --logpriority TRACE):
> 
> lxc-start debian-sid 20230515092650.376 WARN     cgfsng - ../src/lxc/cgroups/cgfsng.c:get_hierarchy:149 - There is no useable devices controller
> lxc-start debian-sid 20230515092650.376 ERROR    cgfsng - ../src/lxc/cgroups/cgfsng.c:cg_legacy_set_data:3098 - No such file or directory - Failed to setup limits for the "devices" controller. The controller seems to be unused by "cgfsng" cgroup driver or not enabled on the cgroup hierarchy
> lxc-start debian-sid 20230515092650.376 ERROR    cgfsng - ../src/lxc/cgroups/cgfsng.c:cgfsng_setup_limits_legacy:3165 - No such file or directory - Failed to set "devices.deny" to "a"
> lxc-start debian-sid 20230515092650.376 ERROR    start - ../src/lxc/start.c:lxc_spawn:1893 - Failed to setup legacy device cgroup controller limits

Ah, success!  I followed the recipe on
https://wiki.debian.org/LXC/CGroupV2 referenced in
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=944389 (adding the
lines

lxc.cgroup.devices.allow =
lxc.cgroup.devices.deny =

to the end of /var/lib/lxc/debian-sid/config) and it now works.

But there's no mention of this in /usr/share/doc/lxc/README.Debian.gz,
and I don't need to do this on my other machine, so there's still
something weird going on on this machine.  Perhaps it's a hardware
thing?

Oh joys!

Best wishes,

   Julian