2586 33 0:79 / /sys/fs/cgroup/net_cls rw,relatime shared:1045 - cgroup net_cls rw,net_cls
That’s the issue.
We’ve seen it occasionally but haven’t yet found the root cause for this.
It’s a cgroup1 controller mounted on top of a cgroup2 tree, that’s a very bad idea and causes a bunch of issues.
A temporary fix is to run umount -l /sys/fs/cgroup/net_cls but that will not survive a reboot.