Re: [PATCH bpf-next 2/3] selftests/bpf: Run arena tests serially

[sashiko-bot@kernel.org]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:

Pre-existing issues:
- [High] Incomplete serialization of BPF arena tests leaves the CI environment vulnerable to OOM.
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--- Patch [2]: [PATCH bpf-next 2/3] selftests/bpf: Run arena tests serially ---
commit 4661bf4c3b39723c6187b74928c316a1e721ac60
Author: Jiayuan Chen <jiayuan.chen@linux.dev>

selftests/bpf: Run arena tests serially

This commit changes several BPF arena tests to run serially to prevent memory
exhaustion during KASAN builds. By renaming the test functions to start with
serial_test_, the selftests framework ensures at most one arena is alive at a
time.

> Make the arena tests serial so at most one arena is alive at a time.

[Severity: High]
This is a pre-existing issue, but there are other tests that allocate
BPF_MAP_TYPE_ARENA maps which are still running in parallel.

For example, in tools/testing/selftests/bpf/prog_tests/verifier.c:

void test_verifier_arena(void)                { RUN(verifier_arena); }
void test_verifier_arena_large(void)          { RUN(verifier_arena_large); }

In tools/testing/selftests/bpf/prog_tests/stream.c:

void test_stream_success(void)
{
	RUN_TESTS(stream);
	return;
}

In tools/testing/selftests/bpf/prog_tests/compute_live_registers.c:

void test_compute_live_registers(void)
{
	RUN_TESTS(compute_live_registers);
}

Since these remain prefixed with test_ rather than serial_test_, won't they
still run concurrently and potentially exhaust memory on KASAN builds?

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260716142746.8794-1-jiayuan.chen@linux.dev?part=2