git: b5c60bb85bf3 - main - stress2: Added a write(2) fuzz test scenario

The branch main has been updated by pho:

URL: https://cgit.FreeBSD.org/src/commit/?id=b5c60bb85bf3fbe6815454a54aba3d0f2845de80

commit b5c60bb85bf3fbe6815454a54aba3d0f2845de80
Author:     Peter Holm <pho@FreeBSD.org>
AuthorDate: 2022-04-06 05:24:42 +0000
Commit:     Peter Holm <pho@FreeBSD.org>
CommitDate: 2022-04-06 05:24:42 +0000

    stress2: Added a write(2) fuzz test scenario
---
 tools/test/stress2/misc/write2.sh | 41 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/tools/test/stress2/misc/write2.sh b/tools/test/stress2/misc/write2.sh
new file mode 100755
index 000000000000..9e6d50917464
--- /dev/null
+++ b/tools/test/stress2/misc/write2.sh
@@ -0,0 +1,41 @@
+#!/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.
+#
+
+# A write(2) syscall fuzzer
+
+# "panic: Assertion tib != NULL failed at ../../../kern/tty_inq.c:467" seen:
+# https://people.freebsd.org/~pho/stress/log/log0272.txt
+
+num=`awk '/SYS_write[^a-z]/ {print $NF}' < /usr/include/sys/syscall.h`
+[ -z "$num" ] && exit 0
+
+kldstat | grep -q pty.ko || kldload pty.ko
+./syscall4.sh $num
+
+exit 0