missed_kprobe attaches test1 to bpf_fentry_test1 and test2 to
bpf_kfunc_common_test, which test1 calls. test_missed_perf_kprobe()
expects the kprobe of test2 to miss exactly one run, the one test1
triggers, since kprobes don't nest.
bpf_kfunc_common_test is a kfunc of bpf_testmod that other tests call
as well. When one of them calls it from another kprobe while test2 is
attached, the kprobe of test2 counts an extra miss, and the test reads
2 instead of 1.
Expect at least one miss, as missed_kprobe_recursion does since
commit 08a7078feacf ("selftests/bpf: Improve missed_kprobe_recursion test
robustness").
Fixes: 01e4ae474e39 ("selftests/bpf: Add test for missed counts of perf event
link kprobe")
Signed-off-by: Qiliang Yuan <[email protected]>
---
tools/testing/selftests/bpf/prog_tests/missed.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/missed.c
b/tools/testing/selftests/bpf/prog_tests/missed.c
index ed8857ae914a6..dc91be982dd32 100644
--- a/tools/testing/selftests/bpf/prog_tests/missed.c
+++ b/tools/testing/selftests/bpf/prog_tests/missed.c
@@ -36,7 +36,7 @@ static void test_missed_perf_kprobe(void)
ASSERT_EQ(info.type, BPF_LINK_TYPE_PERF_EVENT, "info.type");
ASSERT_EQ(info.perf_event.type, BPF_PERF_EVENT_KPROBE,
"info.perf_event.type");
- ASSERT_EQ(info.perf_event.kprobe.missed, 1,
"info.perf_event.kprobe.missed");
+ ASSERT_GE(info.perf_event.kprobe.missed, 1,
"info.perf_event.kprobe.missed");
cleanup:
missed_kprobe__destroy(skel);
---
base-commit: e1d84a37cba984388988d2f1ddc84561413f0db2
change-id: 20261009-selftests-bpf-missed-perf-kprobe-05471f2aec76
Best regards,
--
Qiliang Yuan <[email protected]>
