From c13339039891dbdfa6c1972f0483bd07f610b776 Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Thu, 13 Nov 2025 09:11:53 -0800 Subject: [PATCH] selftests/bpf: Fix failure paths in send_signal test When test_send_signal_kern__open_and_load() fails parent closes the pipe which cases ASSERT_EQ(read(pipe_p2c...)) to fail, but child continues and enters infinite loop, while parent is stuck in wait(NULL). Other error paths have similar issue, so kill the child before waiting on it. The bug was discovered while compiling all of selftests with -O1 instead of -O2 which caused progs/test_send_signal_kern.c to fail to load. Fixes: ab8b7f0cb358 ("tools/bpf: Add self tests for bpf_send_signal_thread()") Signed-off-by: Alexei Starovoitov Signed-off-by: Andrii Nakryiko Acked-by: Eduard Zingerman Link: https://lore.kernel.org/bpf/20251113171153.2583-1-alexei.starovoitov@gmail.com --- tools/testing/selftests/bpf/prog_tests/send_signal.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/send_signal.c b/tools/testing/selftests/bpf/prog_tests/send_signal.c index 1702aa592c2c2..7ac4d5a488aa5 100644 --- a/tools/testing/selftests/bpf/prog_tests/send_signal.c +++ b/tools/testing/selftests/bpf/prog_tests/send_signal.c @@ -206,6 +206,11 @@ destroy_skel: skel_open_load_failure: close(pipe_c2p[0]); close(pipe_p2c[1]); + /* + * Child is either about to exit cleanly or stuck in case of errors. + * Nudge it to exit. + */ + kill(pid, SIGKILL); wait(NULL); } -- 2.47.3