** Tags added: verification-done-focal -- 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 controllers mounted when using 'cgroup_no_v1=' Status in linux package in Ubuntu: Fix Released Status in linux source package in Focal: Fix Committed 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
