cgroup_hierarchical_stats mounts a bpffs on /sys/fs/bpf to pin its iterators, and unmounts it in the end if the test mounted it itself.
It mounts a bpffs even when one is already there, and its cleanup checks the other way around whether it did, so it never unmounts it. Each run leaves another bpffs stacked on /sys/fs/bpf, and while the test runs, tests running in parallel lose what they pinned, which makes bpftool_maps_access and bpftool_metadata fail now and then. Patch 1 makes the cleanup unmount the bpffs that the test mounted, patch 2 stops mounting one over an existing bpffs. Signed-off-by: Qiliang Yuan <[email protected]> --- Qiliang Yuan (2): selftests/bpf: Unmount the bpffs that cgroup_hierarchical_stats mounted selftests/bpf: Don't stack a bpffs in cgroup_hierarchical_stats .../bpf/prog_tests/cgroup_hierarchical_stats.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) --- base-commit: e1d84a37cba984388988d2f1ddc84561413f0db2 change-id: 20261008-selftests-bpf-cgroup-stats-bpffs-4534db24d15c Best regards, -- Qiliang Yuan <[email protected]>
