** Description changed: Almost half of the ubuntu_ltp_controllers tests are failing due to the general pattern 'cgroup_name already mounted or mount point busy' causing the tests to fail. e.g. mount: /dev/cgroup: ltp_cgroup already mounted or mount point busy. cgroup_fj_function2_memory 1 TBROK: mount -t cgroup -o memory ltp_cgroup /dev/cgroup failed - From investigation it seems there's an issue with the transition to - cgroup-v2, which on the ltp mailing list has been rumored that one of - these days the tests would break. Its likely this was caused by a - systemd update, switching to cgroup-v2 causing these tests to break due - to different mount and cgroup hierarchy semantics. + From investigation it seems there could be an issue with the transition + to cgroup-v2. There have been rumors on the ltp mailing list that one of + these days the tests could break due to the transition. Switching to + cgroup-v2, likely due to a systemd update, could cause these tests to + break due to different mount and cgroup hierarchy semantics. - After setting systemd.unified_cgroup_hierarchy=0 on the kernel command - line which sets cgroup back to v1, we get the expected failures that we - saw in previous cycles, pointing to this not being a kernel regression. + I could only reproduce a subset of the new failures we are seeing, but + after setting systemd.unified_cgroup_hierarchy=0 on the kernel command + line which sets cgroup back to v1, a lot of the failures I could produce + went away.
-- 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/1949532 Title: ubuntu_ltp_controllers tests failing on Impish Status in ubuntu-kernel-tests: New Status in linux package in Ubuntu: Incomplete Bug description: Almost half of the ubuntu_ltp_controllers tests are failing due to the general pattern 'cgroup_name already mounted or mount point busy' causing the tests to fail. e.g. mount: /dev/cgroup: ltp_cgroup already mounted or mount point busy. cgroup_fj_function2_memory 1 TBROK: mount -t cgroup -o memory ltp_cgroup /dev/cgroup failed From investigation it seems there could be an issue with the transition to cgroup-v2. There have been rumors on the ltp mailing list that one of these days the tests could break due to the transition. Switching to cgroup-v2, likely due to a systemd update, could cause these tests to break due to different mount and cgroup hierarchy semantics. I could only reproduce a subset of the new failures we are seeing, but after setting systemd.unified_cgroup_hierarchy=0 on the kernel command line which sets cgroup back to v1, a lot of the failures I could produce went away. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1949532/+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
