1 files changed, 148 insertions, 0 deletions

diff --git a/tools/test/stress2/misc/kern_umtx_inf_loop.sh b/tools/test/stress2/misc/kern_umtx_inf_loop.sh
new file mode 100755
index 000000000000..b8088814d7b2
--- /dev/null
+++ b/tools/test/stress2/misc/kern_umtx_inf_loop.sh
@@ -0,0 +1,148 @@
+#!/bin/sh
+
+# The program is a test case by Eric which demonstrates the
+# bug, unkillable spinning thread, owning a spinlock.
+
+# "panic: spin lock held too long" seen.
+# Fixed in r277970.
+
+. ../default.cfg
+
+here=`pwd`
+cd /tmp
+sed '1,/^EOF/d' < $here/$0 > kern_umtx_inf_loop.c
+mycc -o kern_umtx_inf_loop -Wall -Wextra -O0 -g kern_umtx_inf_loop.c \
+    -lpthread || exit 1
+rm -f kern_umtx_inf_loop.c
+
+/tmp/kern_umtx_inf_loop
+
+rm -f /tmp/kern_umtx_inf_loop
+exit 0
+EOF
+/*-
+ * Copyright (c) 2015 Eric van Gyzen
+ * 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 AUTHOR 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 AUTHOR 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>
+#include <sys/types.h>
+
+#include <machine/cpufunc.h>
+#include <machine/cpu.h>
+
+#include <err.h>
+#include <pthread.h>
+#include <pthread_np.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+pthread_mutex_t the_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+pthread_t contender;
+
+static void *
+contender_func(void *arg)
+{
+    int error;
+
+    (void) arg;
+
+    error = pthread_mutex_lock(&the_mutex);
+    if (error) errc(1, error, "pthread_mutex_lock contender");
+
+    fprintf(stderr, "contender lock succeeded\n");
+
+    error = pthread_mutex_unlock(&the_mutex);
+    if (error) errc(1, error, "pthread_mutex_unlock contender");
+
+    fprintf(stderr, "contender unlock succeeded; exiting\n");
+
+    return (NULL);
+}
+
+static void *
+signaler_func(void *arg __unused)
+{
+    int error;
+
+    // Wait for the main thread to sleep.
+    usleep(100000);
+
+    error = pthread_kill(contender, SIGHUP);
+    if (error) errc(1, error, "pthread_kill");
+
+    // Wait for the contender to lock umtx_lock
+    // in umtx_repropagate_priority.
+    usleep(100000);
+
+    error = pthread_mutex_lock(&the_mutex);
+    if (error) errc(1, error, "pthread_mutex_lock signaler");
+
+    return (NULL);
+}
+
+int
+main(void)
+{
+    int error;
+
+    pthread_mutexattr_t mattr;
+
+    error = pthread_mutexattr_init(&mattr);
+    if (error) errc(1, error, "pthread_mutexattr_init");
+
+    error = pthread_mutexattr_setprotocol(&mattr, PTHREAD_PRIO_INHERIT);
+    if (error) errc(1, error, "pthread_mutexattr_setprotocol");
+
+    error = pthread_mutex_init(&the_mutex, &mattr);
+    if (error) errc(1, error, "pthread_mutex_init");
+
+    error = pthread_mutexattr_destroy(&mattr);
+    if (error) errc(1, error, "pthread_mutexattr_destroy");
+
+    //error = pthread_mutex_lock(&the_mutex);
+    //if (error) errc(1, error, "pthread_mutex_lock");
+
+    // Hack lock.
+    *(int *)the_mutex = pthread_getthreadid_np();
+
+    error = pthread_create(&contender, NULL, contender_func, NULL);
+    if (error) errc(1, error, "pthread_create");
+
+    // Wait for the contender to sleep.
+    usleep(100000);
+
+    pthread_t signaler;
+    error = pthread_create(&signaler, NULL, signaler_func, NULL);
+    if (error) errc(1, error, "pthread_create");
+
+    error = pthread_mutex_lock(&the_mutex);
+    if (error) errc(1, error, "pthread_mutex_lock recurse");
+
+    return (0);
+}
+