Container freezing instead of OOM

[janmuennich]

Required information

• Distribution: Ubuntu
• Distribution version: 22.04
• The output of "incus info" or if that fails:
  • Kernel version: 5.15.0-92-generic
  • Incus version: 6.0 LTS
  • Storage backend in use: ZFS

Issue description

On LXD since 5.0.3 LTS we regularly see that processes in containers are not killed when the configured memory limit is reached (OOM). This seems to be the same issue as canonical/lxd#13147

I now tried to reproduce an OOM situation in a container with Incus 6.0 which also led to a freeze instead of some processes killed.

Is Incus affected by the same bug ?

Steps to reproduce

1. Configure a memory limit with lxc config set limits.memory 1GiB
2. Create an OOM situation with stress-ng or a similar tool or with regular applications
3. Container freezes and load average goes up on host system

[janmuennich]

Thanks. Is there any workaround to correctly set the hard memory limit in the meantime?

[stgraber]

If you're using the Zabbly packages, just apply your updates as the fix was backported right after it landed.

Otherwise the two options I can see as workarounds are:

• Give more RAM until the issue is resolved
• Reboot your system in cgroup1 mode until the issue is resolved

[janmuennich]

Amazing! I thought I had to wait for 6.0.1 ;)