This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1988584 and then change the status of the bug to 'Confirmed'. If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'. This change has been made by an automated script, maintained by the Ubuntu Kernel Team. ** Changed in: linux (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1988584 Title: cgroup: all controller mounted when using 'cgroup_no_v1=' Status in linux package in Ubuntu: Incomplete Bug description: [Impact] When mounting a cgroup hierarchy with disabled controller in cgroup v1, all available controllers will be attached. For example, boot with cgroup_no_v1=cpu or cgroup_disable=cpu, and then mount with "mount -t cgroup -ocpu cpu /sys/fs/cgroup/cpu", then all enabled controllers will be attached except cpu. This exists since linux v5.1 and fixed in linux v5.11 with this commit: 61e960b07b63 cgroup-v1: add disabled controller check in cgroup1_parse_param() https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=61e960b07b637 [Test Case] root@dut-vm:~# kexec -l /boot/vmlinuz-5.4.0-122-generic --initrd=/boot/initrd.img-5.4.0-122-generic --command-line="$(cat /proc/cmdline) cgroup_no_v1=net_prio,net_cls" root@dut-vm:~# systemctl kexec root@dut-vm:~# mount | grep cgroup tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755) cgroup2 on /sys/fs/cgroup/unified type cgroup2 (rw,nosuid,nodev,noexec,relatime,nsdelegate) cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,name=systemd) cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset,cpu,cpuacct,blkio,memory,devices,freezer,perf_event,hugetlb,pids,rdma) => All controllers are associated to /sys/fs/cgroup/net_cls,net_prio. Note that several reboots may be needed to reproduce the problem (it fails only when systemd tries to mount 'net_cls,net_prio' first, but the order is random). [Regression Potential] The patch is located in cgroup1_parse_param(), the potential regressions are low. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1988584/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp