[PATCH bpf-next] selftests/bpf: Expect at least one tp_recursion miss in missed

[PATCH bpf-next] selftests/bpf: Expect at least one tp_recursion miss in missed

[Qiliang Yuan]

missed_tp_recursion attaches its tp programs to bpf_trace_printk and
expects each of them to miss exactly one run, the one that its kprobe
program triggers by calling bpf_printk().

Any other kprobe program calling bpf_printk() hits bpf_trace_printk as
well. When another test runs one in parallel, the tp programs that are
already attached at that point count an extra miss, and
test2_recursion_misses comes out as 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: 85981e0f9e9f ("selftests/bpf: Add test for recursion counts of perf event link tracepoint")
Signed-off-by: Qiliang Yuan <odys.yuan@gmail.com>
---
 tools/testing/selftests/bpf/prog_tests/missed.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/missed.c b/tools/testing/selftests/bpf/prog_tests/missed.c
index ed8857ae914a6..0b8f1aa5a3e74 100644
--- a/tools/testing/selftests/bpf/prog_tests/missed.c
+++ b/tools/testing/selftests/bpf/prog_tests/missed.c
@@ -120,9 +120,9 @@ static void test_missed_tp_recursion(void)
 	ASSERT_EQ(topts.retval, 0, "test_run");
 
 	ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test1)), 0, "test1_recursion_misses");
-	ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test2)), 1, "test2_recursion_misses");
-	ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test3)), 1, "test3_recursion_misses");
-	ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test4)), 1, "test4_recursion_misses");
+	ASSERT_GE(get_missed_count(bpf_program__fd(skel->progs.test2)), 1, "test2_recursion_misses");
+	ASSERT_GE(get_missed_count(bpf_program__fd(skel->progs.test3)), 1, "test3_recursion_misses");
+	ASSERT_GE(get_missed_count(bpf_program__fd(skel->progs.test4)), 1, "test4_recursion_misses");
 
 cleanup:
 	missed_tp_recursion__destroy(skel);

---
base-commit: e1d84a37cba984388988d2f1ddc84561413f0db2
change-id: 20261008-selftests-bpf-missed-tp-recursion-2fc11396aa31

Best regards,
-- 
Qiliang Yuan <odys.yuan@gmail.com>

Re: [PATCH bpf-next] selftests/bpf: Expect at least one tp_recursion miss in missed

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Daniel Borkmann <daniel@iogearbox.net>:

On Thu, 08 Oct 2026 22:03:47 +0800 you wrote:
> missed_tp_recursion attaches its tp programs to bpf_trace_printk and
> expects each of them to miss exactly one run, the one that its kprobe
> program triggers by calling bpf_printk().
> 
> Any other kprobe program calling bpf_printk() hits bpf_trace_printk as
> well. When another test runs one in parallel, the tp programs that are
> already attached at that point count an extra miss, and
> test2_recursion_misses comes out as 2 instead of 1.
> 
> [...]

Here is the summary with links:
  - [bpf-next] selftests/bpf: Expect at least one tp_recursion miss in missed
    https://git.kernel.org/bpf/bpf-next/c/a5e144985d68

You are awesome, thank you!
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