git: 8a5c1f58dd0e - main - stress2: Added a regression test

The branch main has been updated by pho:

URL: https://cgit.FreeBSD.org/src/commit/?id=8a5c1f58dd0e81f667b684e48462732eb773c6a9

commit 8a5c1f58dd0e81f667b684e48462732eb773c6a9
Author:     Peter Holm <pho@FreeBSD.org>
AuthorDate: 2022-04-28 07:41:27 +0000
Commit:     Peter Holm <pho@FreeBSD.org>
CommitDate: 2022-04-28 07:41:27 +0000

    stress2: Added a regression test
---
 tools/test/stress2/misc/reaper.sh | 108 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)

diff --git a/tools/test/stress2/misc/reaper.sh b/tools/test/stress2/misc/reaper.sh
new file mode 100755
index 000000000000..1d2d5ade8c6e
--- /dev/null
+++ b/tools/test/stress2/misc/reaper.sh
@@ -0,0 +1,108 @@
+#!/bin/sh
+
+#
+# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+#
+# Copyright (c) 2022 Peter Holm <pho@FreeBSD.org>
+#
+# 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.
+#
+
+# Demonstrate lingering child process after a timeout(1) timeout
+# Test scenario suggestions by kib
+
+# Fixed by: 709783373e57 - main - Fix another race between fork(2) and
+# PROC_REAP_KILL subtree
+
+eval prog=reaper.$$
+cat > /tmp/$prog.c <<EOF
+#include <sys/wait.h>
+#include <err.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define MAXP 10000
+
+int
+main(void)
+{
+	pid_t pids[MAXP];
+	int i, parallel;
+	char *cmdline[] = { "SLP", "86400", NULL };
+
+	for (;;) {
+		parallel = arc4random() % MAXP + 1;
+		for (i = 0; i < parallel; i++) {
+			if ((pids[i] = fork()) == 0) {
+				setproctitle("child");
+				if ((arc4random() % 100) < 10) {
+					if (execve(cmdline[0], cmdline,
+					    NULL) == -1)
+				                err(1, "execve");
+				} else {
+					for (;;)
+						pause();
+				}
+				_exit(0); /* never reached */
+			}
+			if (pids[i] == -1)
+				err(1, "fork()");
+		}
+
+		usleep(arc4random() % 500);
+
+		for (i = 0; i < parallel; i++) {
+			if (kill(pids[i], SIGINT) == -1)
+				err(1, "kill(%d)", pids[i]);
+			if (waitpid(pids[i], NULL, 0) != pids[i])
+				err(1, "waitpid(%d)", pids[i]);
+		}
+	}
+}
+EOF
+sed -i '' "s#SLP#/tmp/$prog.sleep#" /tmp/$prog.c
+cc -o /tmp/$prog -Wall -Wextra -O0 /tmp/$prog.c || exit 1
+rm /tmp/$prog.c
+
+cp /bin/sleep /tmp/$prog.sleep
+n=1
+start=`date +%s`
+while true; do
+	timeout 2s /tmp/$prog
+	for i in `jot 50`; do
+		pgrep -q $prog || break
+		sleep .5
+	done
+	if pgrep -q $prog; then
+		e=$((`date +%s` - start))
+		echo "Failed in loop #$n after $e seconds."
+		pgrep "$prog|timeout" | xargs ps -lp
+		pkill $prog
+		rm -f /tmp/$prog /tmp/$prog.sleep
+		exit 1
+	fi
+	[ $((`date +%s` - start)) -ge 600 ] && break
+	n=$((n + 1))
+done
+rm /tmp/$prog /tmp/$prog.sleep
+exit 0