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[src/trunk]: src/tests/kernel/kqueue Add a test case for the race condition i...
details: https://anonhg.NetBSD.org/src/rev/08a4e3666f8d
branches: trunk
changeset: 989038:08a4e3666f8d
user: thorpej <thorpej%NetBSD.org@localhost>
date: Sun Oct 10 17:47:38 2021 +0000
description:
Add a test case for the race condition in PR kern/50094, modeled after
the Go run-time scenario described in the PR.
diffstat:
distrib/sets/lists/debug/mi | 3 +-
distrib/sets/lists/tests/mi | 3 +-
tests/kernel/kqueue/Makefile | 6 +-
tests/kernel/kqueue/t_scan.c | 117 +++++++++++++++++++++++++++++++++++++++++++
4 files changed, 126 insertions(+), 3 deletions(-)
diffs (176 lines):
diff -r 83a94ad1ce13 -r 08a4e3666f8d distrib/sets/lists/debug/mi
--- a/distrib/sets/lists/debug/mi Sun Oct 10 17:43:15 2021 +0000
+++ b/distrib/sets/lists/debug/mi Sun Oct 10 17:47:38 2021 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: mi,v 1.363 2021/10/10 17:43:15 thorpej Exp $
+# $NetBSD: mi,v 1.364 2021/10/10 17:47:38 thorpej Exp $
./etc/mtree/set.debug comp-sys-root
./usr/lib comp-sys-usr compatdir
./usr/lib/i18n/libBIG5_g.a comp-c-debuglib debuglib,compatfile
@@ -1765,6 +1765,7 @@
./usr/libdata/debug/usr/tests/kernel/kqueue/t_proc2.debug tests-kernel-tests debug,atf,compattestfile
./usr/libdata/debug/usr/tests/kernel/kqueue/t_proc3.debug tests-kernel-tests debug,atf,compattestfile
./usr/libdata/debug/usr/tests/kernel/kqueue/t_proc4.debug tests-kernel-tests debug,atf,compattestfile
+./usr/libdata/debug/usr/tests/kernel/kqueue/t_scan.debug tests-kernel-tests debug,atf,compattestfile
./usr/libdata/debug/usr/tests/kernel/kqueue/t_sig.debug tests-kernel-tests debug,atf,compattestfile
./usr/libdata/debug/usr/tests/kernel/kqueue/t_vnode.debug tests-kernel-tests debug,atf,compattestfile
./usr/libdata/debug/usr/tests/kernel/kqueue/write/t_fifo.debug tests-kernel-tests debug,atf,compattestfile
diff -r 83a94ad1ce13 -r 08a4e3666f8d distrib/sets/lists/tests/mi
--- a/distrib/sets/lists/tests/mi Sun Oct 10 17:43:15 2021 +0000
+++ b/distrib/sets/lists/tests/mi Sun Oct 10 17:47:38 2021 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: mi,v 1.1134 2021/10/10 17:43:15 thorpej Exp $
+# $NetBSD: mi,v 1.1135 2021/10/10 17:47:38 thorpej Exp $
#
# Note: don't delete entries from here - mark them as "obsolete" instead.
#
@@ -2185,6 +2185,7 @@
./usr/tests/kernel/kqueue/t_proc2 tests-kernel-tests compattestfile,atf
./usr/tests/kernel/kqueue/t_proc3 tests-kernel-tests compattestfile,atf
./usr/tests/kernel/kqueue/t_proc4 tests-kernel-tests compattestfile,atf
+./usr/tests/kernel/kqueue/t_scan tests-kernel-tests compattestfile,atf
./usr/tests/kernel/kqueue/t_sig tests-kernel-tests compattestfile,atf
./usr/tests/kernel/kqueue/t_vnode tests-kernel-tests compattestfile,atf
./usr/tests/kernel/kqueue/write tests-kernel-tests compattestfile,atf
diff -r 83a94ad1ce13 -r 08a4e3666f8d tests/kernel/kqueue/Makefile
--- a/tests/kernel/kqueue/Makefile Sun Oct 10 17:43:15 2021 +0000
+++ b/tests/kernel/kqueue/Makefile Sun Oct 10 17:47:38 2021 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.5 2016/04/29 07:12:34 ryoon Exp $
+# $NetBSD: Makefile,v 1.6 2021/10/10 17:47:39 thorpej Exp $
WARNS?=6
NOMAN= # defined
@@ -14,7 +14,11 @@
TESTS_C+= t_proc1
TESTS_C+= t_proc2
TESTS_C+= t_proc3
+TESTS_C+= t_proc4
+TESTS_C+= t_scan
TESTS_C+= t_sig
TESTS_C+= t_vnode
+LDADD.t_scan+= -lpthread
+
.include <bsd.test.mk>
diff -r 83a94ad1ce13 -r 08a4e3666f8d tests/kernel/kqueue/t_scan.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/kernel/kqueue/t_scan.c Sun Oct 10 17:47:38 2021 +0000
@@ -0,0 +1,117 @@
+/* $NetBSD: t_scan.c,v 1.1 2021/10/10 17:47:39 thorpej Exp $ */
+
+/*-
+ * Copyright (c) 2021 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: t_scan.c,v 1.1 2021/10/10 17:47:39 thorpej Exp $");
+
+#include <sys/event.h>
+#include <sys/time.h>
+#include <sys/types.h>
+
+#include <err.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <atf-c.h>
+
+/*
+ * Each kevent thread will make this many kevent() calls, and if it
+ * achieves this mark, we assume the race condition has not occurred
+ * the delcare the test passes.
+ */
+#define NKEVENT_CALLS 10000
+
+static int kq;
+
+static void *
+kevent_thread(void *arg)
+{
+ struct timespec ts = { 0, 0 };
+ struct kevent event;
+ int rv, i;
+
+ for (i = 0; i < NKEVENT_CALLS; i++) {
+ rv = kevent(kq, NULL, 0, &event, 1, &ts);
+ if (rv < 0) {
+ i = rv;
+ break;
+ }
+ if (rv != 1) {
+ break;
+ }
+ }
+
+ return (void *)(intptr_t)i;
+}
+
+ATF_TC(scan1);
+ATF_TC_HEAD(scan1, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "Exercises multi-threaded kevent() calls (PR kern/50094)");
+}
+
+ATF_TC_BODY(scan1, tc)
+{
+ pthread_t t1, t2;
+ void *v1, *v2;
+ intptr_t r1, r2;
+ struct kevent event;
+ int p[2];
+
+ ATF_REQUIRE(pipe(p) == 0);
+ ATF_REQUIRE((kq = kqueue()) >= 0);
+
+ EV_SET(&event, p[0], EVFILT_READ, EV_ADD, 0, 0, 0);
+ ATF_REQUIRE(kevent(kq, &event, 1, NULL, 0, NULL) == 0);
+ ATF_REQUIRE(write(p[1], p, 1) == 1);
+
+ ATF_REQUIRE(pthread_create(&t1, NULL, kevent_thread, NULL) == 0);
+ ATF_REQUIRE(pthread_create(&t2, NULL, kevent_thread, NULL) == 0);
+
+ ATF_REQUIRE(pthread_join(t1, &v1) == 0);
+ r1 = (intptr_t)v1;
+
+ ATF_REQUIRE(pthread_join(t2, &v2) == 0);
+ r2 = (intptr_t)v2;
+
+ ATF_REQUIRE(r1 >= 0);
+ ATF_REQUIRE(r2 >= 0);
+
+ ATF_REQUIRE(r1 == NKEVENT_CALLS);
+ ATF_REQUIRE(r2 == NKEVENT_CALLS);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+ ATF_TP_ADD_TC(tp, scan1);
+
+ return atf_no_error();
+}
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