From af12cb42db0585dd2df152ae2e08e70e5f05e4ee Mon Sep 17 00:00:00 2001
From: Yonghong Song <yhs@fb.com>
Date: Tue, 17 Aug 2021 12:09:23 -0700
Subject: [PATCH] selftests/bpf: Fix flaky send_signal test
Git-commit: b16ac5bf732a5e23d164cf908ec7742d6a6120d3
Patch-mainline: v5.15-rc1
References: stable-5.14.6
[ Upstream commit b16ac5bf732a5e23d164cf908ec7742d6a6120d3 ]
libbpf CI has reported send_signal test is flaky although
I am not able to reproduce it in my local environment.
But I am able to reproduce with on-demand libbpf CI ([1]).
Through code analysis, the following is possible reason.
The failed subtest runs bpf program in softirq environment.
Since bpf_send_signal() only sends to a fork of "test_progs"
process. If the underlying current task is
not "test_progs", bpf_send_signal() will not be triggered
and the subtest will fail.
To reduce the chances where the underlying process is not
the intended one, this patch boosted scheduling priority to
-20 (highest allowed by setpriority() call). And I did
10 runs with on-demand libbpf CI with this patch and I
didn't observe any failures.
[1] https://github.com/libbpf/libbpf/actions/workflows/ondemand.yml
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210817190923.3186725-1-yhs@fb.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
.../selftests/bpf/prog_tests/send_signal.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/tools/testing/selftests/bpf/prog_tests/send_signal.c b/tools/testing/selftests/bpf/prog_tests/send_signal.c
index 023cc532992d..839f7ddaec16 100644
--- a/tools/testing/selftests/bpf/prog_tests/send_signal.c
+++ b/tools/testing/selftests/bpf/prog_tests/send_signal.c
@@ -1,5 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
+#include <sys/time.h>
+#include <sys/resource.h>
#include "test_send_signal_kern.skel.h"
int sigusr1_received = 0;
@@ -41,12 +43,23 @@ static void test_send_signal_common(struct perf_event_attr *attr,
}
if (pid == 0) {
+ int old_prio;
+
/* install signal handler and notify parent */
signal(SIGUSR1, sigusr1_handler);
close(pipe_c2p[0]); /* close read */
close(pipe_p2c[1]); /* close write */
+ /* boost with a high priority so we got a higher chance
+ * that if an interrupt happens, the underlying task
+ * is this process.
+ */
+ errno = 0;
+ old_prio = getpriority(PRIO_PROCESS, 0);
+ ASSERT_OK(errno, "getpriority");
+ ASSERT_OK(setpriority(PRIO_PROCESS, 0, -20), "setpriority");
+
/* notify parent signal handler is installed */
ASSERT_EQ(write(pipe_c2p[1], buf, 1), 1, "pipe_write");
@@ -62,6 +75,9 @@ static void test_send_signal_common(struct perf_event_attr *attr,
/* wait for parent notification and exit */
ASSERT_EQ(read(pipe_p2c[0], buf, 1), 1, "pipe_read");
+ /* restore the old priority */
+ ASSERT_OK(setpriority(PRIO_PROCESS, 0, old_prio), "setpriority");
+
close(pipe_c2p[1]);
close(pipe_p2c[0]);
exit(0);
--
2.26.2