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| author | Mykyta Yatsenko <yatsenko@meta.com> | 2025-09-25 22:52:30 +0100 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2025-09-25 15:55:44 -0700 |
| commit | 105eb5dc74109a9f53c2f26c9a918d9347a73595 (patch) | |
| tree | 69b0c644a233d8834749a235ae8b24885ef64c3f /tools/testing/selftests/bpf/prog_tests/stacktrace_map.c | |
| parent | 1193c46c1745cf809dead55ece4f3baa728f316c (diff) | |
selftests/bpf: Fix flaky bpf_cookie selftest
bpf_cookie can fail on perf_event_open(), when it runs after the task_work
selftest. The task_work test causes perf to lower
sysctl_perf_event_sample_rate, and bpf_cookie uses sample_freq,
which is validated against that sysctl. As a result,
perf_event_open() rejects the attr if the (now tighter) limit is
exceeded.
>From perf_event_open():
if (attr.freq) {
if (attr.sample_freq > sysctl_perf_event_sample_rate)
return -EINVAL;
} else {
if (attr.sample_period & (1ULL << 63))
return -EINVAL;
}
Switch bpf_cookie to use sample_period, which is not checked against
sysctl_perf_event_sample_rate.
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250925215230.265501-1-mykyta.yatsenko5@gmail.com
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/stacktrace_map.c')
0 files changed, 0 insertions, 0 deletions