Fixed with LTP fork update (bug 1982995)
With LTP fork updated, the ubuntu_ltp_controllers on Jammy is now failing with:
* LP: #1986636
cpuset_inherit|cpuset_base_ops|cpuset_exclusive|cpuset_hierarchy|
cpuset_syscall|cpuset_sched_domains|cpuset_load_balance|
cpuset_hotplug|cpuset_memory|cpuset_memory_pressure
* LP: #1986638 cpuset_regression_test
** Changed in: ubuntu-kernel-tests
Status: New => Fix Released
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
** Changed in: ubuntu-kernel-tests
Assignee: (unassigned) => Luke Nowakowski-Krijger (lukenow)
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https://bugs.launchpad.net/bugs/1949532
Title:
ubuntu_ltp_controllers tests failing on Impish ($cgroup_name already
mounted or mount point busy)
Status in ubuntu-kernel-tests:
Fix Released
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Impish:
Won't Fix
Bug description:
Almost half of the ubuntu_ltp_controllers tests (142 out of 198) 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.
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