From patchwork Tue Aug 17 19:09:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yonghong Song X-Patchwork-Id: 12441919 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EA521C4338F for ; Tue, 17 Aug 2021 19:09:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BA7F060FD9 for ; Tue, 17 Aug 2021 19:09:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230373AbhHQTJz (ORCPT ); Tue, 17 Aug 2021 15:09:55 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:16498 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229821AbhHQTJy (ORCPT ); Tue, 17 Aug 2021 15:09:54 -0400 Received: from pps.filterd (m0044010.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 17HJ6b0k018486 for ; Tue, 17 Aug 2021 12:09:21 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=4FkMjJcOyKJQhSfVrcvcRhHJ9skNpOqtZADTYBp+las=; b=IOkyqMbPZhs5qeYmEqkiN+2OhtCseySKdGmLCoCXhw4rSkMW8MK8xnXMNsiXxMiRH7/E vbPr7mTPWJwh32eWj/D2vVdAI9GW+/aCVeWinUZX5IVSfNqgm9FJY25WQlAl03EXvqbG 7f/Swae6zZIP6ydGhcJafMqgGSt/yAdgfhU= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 3afqeya05p-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Tue, 17 Aug 2021 12:09:21 -0700 Received: from intmgw002.06.ash9.facebook.com (2620:10d:c085:208::11) by mail.thefacebook.com (2620:10d:c085:21d::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Tue, 17 Aug 2021 12:09:20 -0700 Received: by devbig003.ftw2.facebook.com (Postfix, from userid 128203) id 0E917606B1B2; Tue, 17 Aug 2021 12:09:18 -0700 (PDT) From: Yonghong Song To: CC: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Subject: [PATCH bpf-next v2 1/2] selftests/bpf: replace CHECK with ASSERT_* macros in send_signal.c Date: Tue, 17 Aug 2021 12:09:18 -0700 Message-ID: <20210817190918.3186400-1-yhs@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210817190912.3185813-1-yhs@fb.com> References: <20210817190912.3185813-1-yhs@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-FB-Source: Intern X-Proofpoint-ORIG-GUID: XvnECC0t43OniCI3mypxoY2Fx40Vmi6j X-Proofpoint-GUID: XvnECC0t43OniCI3mypxoY2Fx40Vmi6j X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-08-17_06:2021-08-17,2021-08-17 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 spamscore=0 priorityscore=1501 impostorscore=0 malwarescore=0 lowpriorityscore=0 mlxscore=0 phishscore=0 suspectscore=0 mlxlogscore=999 bulkscore=0 clxscore=1015 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2107140000 definitions=main-2108170120 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Replace CHECK in send_signal.c with ASSERT_* macros as ASSERT_* macros are generally preferred. There is no funcitonality change. Signed-off-by: Yonghong Song --- .../selftests/bpf/prog_tests/send_signal.c | 45 +++++++++---------- 1 file changed, 20 insertions(+), 25 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/send_signal.c b/tools/testing/selftests/bpf/prog_tests/send_signal.c index 023cc532992d..41e158ae888e 100644 --- a/tools/testing/selftests/bpf/prog_tests/send_signal.c +++ b/tools/testing/selftests/bpf/prog_tests/send_signal.c @@ -10,29 +10,25 @@ static void sigusr1_handler(int signum) } static void test_send_signal_common(struct perf_event_attr *attr, - bool signal_thread, - const char *test_name) + bool signal_thread) { struct test_send_signal_kern *skel; int pipe_c2p[2], pipe_p2c[2]; int err = -1, pmu_fd = -1; - __u32 duration = 0; char buf[256]; pid_t pid; - if (CHECK(pipe(pipe_c2p), test_name, - "pipe pipe_c2p error: %s\n", strerror(errno))) + if (!ASSERT_OK(pipe(pipe_c2p), "pipe_c2p")) return; - if (CHECK(pipe(pipe_p2c), test_name, - "pipe pipe_p2c error: %s\n", strerror(errno))) { + if (!ASSERT_OK(pipe(pipe_p2c), "pipe_p2c")) { close(pipe_c2p[0]); close(pipe_c2p[1]); return; } pid = fork(); - if (CHECK(pid < 0, test_name, "fork error: %s\n", strerror(errno))) { + if (!ASSERT_GE(pid, 0, "fork")) { close(pipe_c2p[0]); close(pipe_c2p[1]); close(pipe_p2c[0]); @@ -48,19 +44,19 @@ static void test_send_signal_common(struct perf_event_attr *attr, close(pipe_p2c[1]); /* close write */ /* notify parent signal handler is installed */ - CHECK(write(pipe_c2p[1], buf, 1) != 1, "pipe_write", "err %d\n", -errno); + ASSERT_EQ(write(pipe_c2p[1], buf, 1), 1, "pipe_write"); /* make sure parent enabled bpf program to send_signal */ - CHECK(read(pipe_p2c[0], buf, 1) != 1, "pipe_read", "err %d\n", -errno); + ASSERT_EQ(read(pipe_p2c[0], buf, 1), 1, "pipe_read"); /* wait a little for signal handler */ sleep(1); buf[0] = sigusr1_received ? '2' : '0'; - CHECK(write(pipe_c2p[1], buf, 1) != 1, "pipe_write", "err %d\n", -errno); + ASSERT_EQ(write(pipe_c2p[1], buf, 1), 1, "pipe_write"); /* wait for parent notification and exit */ - CHECK(read(pipe_p2c[0], buf, 1) != 1, "pipe_read", "err %d\n", -errno); + ASSERT_EQ(read(pipe_p2c[0], buf, 1), 1, "pipe_read"); close(pipe_c2p[1]); close(pipe_p2c[0]); @@ -71,20 +67,19 @@ static void test_send_signal_common(struct perf_event_attr *attr, close(pipe_p2c[0]); /* close read */ skel = test_send_signal_kern__open_and_load(); - if (CHECK(!skel, "skel_open_and_load", "skeleton open_and_load failed\n")) + if (!ASSERT_OK_PTR(skel, "skel_open_and_load")) goto skel_open_load_failure; if (!attr) { err = test_send_signal_kern__attach(skel); - if (CHECK(err, "skel_attach", "skeleton attach failed\n")) { + if (!ASSERT_OK(err, "skel_attach")) { err = -1; goto destroy_skel; } } else { pmu_fd = syscall(__NR_perf_event_open, attr, pid, -1, -1 /* group id */, 0 /* flags */); - if (CHECK(pmu_fd < 0, test_name, "perf_event_open error: %s\n", - strerror(errno))) { + if (!ASSERT_GE(pmu_fd, 0, "perf_event_open")) { err = -1; goto destroy_skel; } @@ -96,7 +91,7 @@ static void test_send_signal_common(struct perf_event_attr *attr, } /* wait until child signal handler installed */ - CHECK(read(pipe_c2p[0], buf, 1) != 1, "pipe_read", "err %d\n", -errno); + ASSERT_EQ(read(pipe_c2p[0], buf, 1), 1, "pipe_read"); /* trigger the bpf send_signal */ skel->bss->pid = pid; @@ -104,21 +99,21 @@ static void test_send_signal_common(struct perf_event_attr *attr, skel->bss->signal_thread = signal_thread; /* notify child that bpf program can send_signal now */ - CHECK(write(pipe_p2c[1], buf, 1) != 1, "pipe_write", "err %d\n", -errno); + ASSERT_EQ(write(pipe_p2c[1], buf, 1), 1, "pipe_write"); /* wait for result */ err = read(pipe_c2p[0], buf, 1); - if (CHECK(err < 0, test_name, "reading pipe error: %s\n", strerror(errno))) + if (!ASSERT_GE(err, 0, "reading pipe")) goto disable_pmu; - if (CHECK(err == 0, test_name, "reading pipe error: size 0\n")) { + if (!ASSERT_GT(err, 0, "reading pipe error: size 0")) { err = -1; goto disable_pmu; } - CHECK(buf[0] != '2', test_name, "incorrect result\n"); + ASSERT_EQ(buf[0], '2', "incorrect result"); /* notify child safe to exit */ - CHECK(write(pipe_p2c[1], buf, 1) != 1, "pipe_write", "err %d\n", -errno); + ASSERT_EQ(write(pipe_p2c[1], buf, 1), 1, "pipe_write"); disable_pmu: close(pmu_fd); @@ -132,7 +127,7 @@ static void test_send_signal_common(struct perf_event_attr *attr, static void test_send_signal_tracepoint(bool signal_thread) { - test_send_signal_common(NULL, signal_thread, "tracepoint"); + test_send_signal_common(NULL, signal_thread); } static void test_send_signal_perf(bool signal_thread) @@ -143,7 +138,7 @@ static void test_send_signal_perf(bool signal_thread) .config = PERF_COUNT_SW_CPU_CLOCK, }; - test_send_signal_common(&attr, signal_thread, "perf_sw_event"); + test_send_signal_common(&attr, signal_thread); } static void test_send_signal_nmi(bool signal_thread) @@ -172,7 +167,7 @@ static void test_send_signal_nmi(bool signal_thread) close(pmu_fd); } - test_send_signal_common(&attr, signal_thread, "perf_hw_event"); + test_send_signal_common(&attr, signal_thread); } void test_send_signal(void) From patchwork Tue Aug 17 19:09:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yonghong Song X-Patchwork-Id: 12441921 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-24.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7675AC4338F for ; Tue, 17 Aug 2021 19:09:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 60EC360BD3 for ; 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Tue, 17 Aug 2021 12:09:26 -0700 Received: from intmgw006.03.ash8.facebook.com (2620:10d:c085:108::4) by mail.thefacebook.com (2620:10d:c085:21d::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Tue, 17 Aug 2021 12:09:24 -0700 Received: by devbig003.ftw2.facebook.com (Postfix, from userid 128203) id 45258606B1E7; Tue, 17 Aug 2021 12:09:23 -0700 (PDT) From: Yonghong Song To: CC: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Subject: [PATCH bpf-next v2 2/2] selftests/bpf: fix flaky send_signal test Date: Tue, 17 Aug 2021 12:09:23 -0700 Message-ID: <20210817190923.3186725-1-yhs@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210817190912.3185813-1-yhs@fb.com> References: <20210817190912.3185813-1-yhs@fb.com> X-FB-Internal: Safe X-FB-Source: Intern X-Proofpoint-ORIG-GUID: W1Hv_HGAF5P-lhzNrBFaUtVvbr7PrcqL X-Proofpoint-GUID: W1Hv_HGAF5P-lhzNrBFaUtVvbr7PrcqL X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-08-17_06:2021-08-17,2021-08-17 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 malwarescore=0 adultscore=0 phishscore=0 mlxlogscore=999 bulkscore=0 lowpriorityscore=0 suspectscore=0 mlxscore=0 impostorscore=0 priorityscore=1501 clxscore=1015 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2107140000 definitions=main-2108170120 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net 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 --- .../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 41e158ae888e..776916b61c40 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 +#include +#include #include "test_send_signal_kern.skel.h" int sigusr1_received = 0; @@ -37,12 +39,23 @@ 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"); @@ -58,6 +71,9 @@ 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);