** Tags added: 5.13 hinted linux-kvm sru-20211018 ubuntu-ltp ubuntu-ltp-
controllers
** Changed in: linux (Ubuntu)
Status: Incomplete => New
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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:
New
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'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.
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.
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