[PATCHv2 bpf-next 5/6] selftests/bpf: Add stacktrace ips test for fentry/fexit
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From: Jiri Olsa <jolsa@kernel.org>
Date: 2026-01-26 21:19:46
Also in:
bpf
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [selftests] (test runners & infrastructure), kernel selftest framework, the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Shuah Khan, Shuah Khan, Linus Torvalds
Adding test that attaches fentry/fexitand verifies the ORC stacktrace matches expected functions. The test is only for ORC unwinder to keep it simple. Signed-off-by: Jiri Olsa <jolsa@kernel.org> --- .../selftests/bpf/prog_tests/stacktrace_ips.c | 51 +++++++++++++++++++ .../selftests/bpf/progs/stacktrace_ips.c | 20 ++++++++ 2 files changed, 71 insertions(+)
diff --git a/tools/testing/selftests/bpf/prog_tests/stacktrace_ips.c b/tools/testing/selftests/bpf/prog_tests/stacktrace_ips.c
index 852830536109..da42b00e3d1f 100644
--- a/tools/testing/selftests/bpf/prog_tests/stacktrace_ips.c
+++ b/tools/testing/selftests/bpf/prog_tests/stacktrace_ips.c@@ -183,6 +183,53 @@ static void test_stacktrace_ips_kprobe(bool retprobe) stacktrace_ips__destroy(skel); } +static void test_stacktrace_ips_trampoline(bool retprobe) +{ + LIBBPF_OPTS(bpf_test_run_opts, topts); + struct stacktrace_ips *skel; + + skel = stacktrace_ips__open_and_load(); + if (!ASSERT_OK_PTR(skel, "stacktrace_ips__open_and_load")) + return; + + if (!skel->kconfig->CONFIG_UNWINDER_ORC) { + test__skip(); + goto cleanup; + } + + if (retprobe) { + skel->links.fexit_test = bpf_program__attach_trace(skel->progs.fexit_test); + if (!ASSERT_OK_PTR(skel->links.fexit_test, "bpf_program__attach_trace")) + goto cleanup; + } else { + skel->links.fentry_test = bpf_program__attach_trace(skel->progs.fentry_test); + if (!ASSERT_OK_PTR(skel->links.fentry_test, "bpf_program__attach_trace")) + goto cleanup; + } + + trigger_module_test_read(1); + + load_kallsyms(); + + if (retprobe) { + check_stacktrace_ips(bpf_map__fd(skel->maps.stackmap), skel->bss->stack_key, 4, + ksym_get_addr("bpf_testmod_stacktrace_test_3"), + ksym_get_addr("bpf_testmod_stacktrace_test_2"), + ksym_get_addr("bpf_testmod_stacktrace_test_1"), + ksym_get_addr("bpf_testmod_test_read")); + } else { + check_stacktrace_ips(bpf_map__fd(skel->maps.stackmap), skel->bss->stack_key, 5, + ksym_get_addr("bpf_testmod_stacktrace_test"), + ksym_get_addr("bpf_testmod_stacktrace_test_3"), + ksym_get_addr("bpf_testmod_stacktrace_test_2"), + ksym_get_addr("bpf_testmod_stacktrace_test_1"), + ksym_get_addr("bpf_testmod_test_read")); + } + +cleanup: + stacktrace_ips__destroy(skel); +} + static void __test_stacktrace_ips(void) { if (test__start_subtest("kprobe_multi"))
@@ -195,6 +242,10 @@ static void __test_stacktrace_ips(void) test_stacktrace_ips_kprobe(false); if (test__start_subtest("kretprobe")) test_stacktrace_ips_kprobe(true); + if (test__start_subtest("fentry")) + test_stacktrace_ips_trampoline(false); + if (test__start_subtest("fexit")) + test_stacktrace_ips_trampoline(true); } #else static void __test_stacktrace_ips(void)
diff --git a/tools/testing/selftests/bpf/progs/stacktrace_ips.c b/tools/testing/selftests/bpf/progs/stacktrace_ips.c
index cae077a4061b..6830f2978613 100644
--- a/tools/testing/selftests/bpf/progs/stacktrace_ips.c
+++ b/tools/testing/selftests/bpf/progs/stacktrace_ips.c@@ -53,4 +53,24 @@ int rawtp_test(void *ctx) return 0; } +SEC("fentry/bpf_testmod_stacktrace_test") +int fentry_test(struct pt_regs *ctx) +{ + /* + * Skip 2 bpf_program/trampoline stack entries: + * - bpf_prog_bd1f7a949f55fb03_fentry_test + * - bpf_trampoline_182536277701 + */ + stack_key = bpf_get_stackid(ctx, &stackmap, 2); + return 0; +} + +SEC("fexit/bpf_testmod_stacktrace_test") +int fexit_test(struct pt_regs *ctx) +{ + /* Skip 2 bpf_program/trampoline stack entries, check fentry_test. */ + stack_key = bpf_get_stackid(ctx, &stackmap, 2); + return 0; +} + char _license[] SEC("license") = "GPL";
--
2.52.0