Index: user/pho/stress2/misc/systrace.sh
===================================================================
--- user/pho/stress2/misc/systrace.sh	(nonexistent)
+++ user/pho/stress2/misc/systrace.sh	(revision 358456)
@@ -0,0 +1,64 @@
+#!/bin/sh
+
+#
+# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+#
+# Copyright (c) 2020 Peter Holm
+#
+# 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.
+#
+# $FreeBSD$
+#
+
+# 20200224 13:05:04 all (1/1): systrace.sh
+# [ thread pid 64171 tid 100708 ]
+# Stopped at      sdt_modevent+0x1c1:     int     $3
+# db>
+
+# markj@ wrote:
+# I think I see the problem now.  It should happen if you:
+# 1. load systrace.ko
+# 2. enable some system call probes, and disable them again
+# 3. unload systrace.ko
+# 4. load some unrelated module
+# 5. goto 1
+#
+# In particular, if systrace.ko is loaded at different addresses each
+# time, we'll end up calling a stale function pointer.
+
+# https://people.freebsd.org/~pho/stress/log/mark137.txt
+
+[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
+. ../default.cfg
+
+dtrace -n 'dtrace:::BEGIN { exit(0); }' > /dev/null 2>&1 || exit 0
+for i in `jot 2`; do
+	sleep 4 & pid=$!
+	dtrace -w -n 'syscall::*read:entry,syscall::*write:entry {\
+	    @rw[execname,probefunc] = count(); }' -p $pid > /dev/null 2>&1
+	wait $pid
+	kldstat | grep -q dtraceall.ko && kldunload dtraceall.ko
+
+	mount -t tmpfs dummy $mntpoint && umount $mntpoint
+done
+kldstat | grep -q tmpfs && kldunload tmpfs.ko
+exit 0

Property changes on: user/pho/stress2/misc/systrace.sh
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Added: svn:executable
## -0,0 +1 ##
+*
\ No newline at end of property
Index: user/pho/stress2/misc/systrace2.sh
===================================================================
--- user/pho/stress2/misc/systrace2.sh	(nonexistent)
+++ user/pho/stress2/misc/systrace2.sh	(revision 358456)
@@ -0,0 +1,50 @@
+#!/bin/sh
+
+#
+# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+#
+# Copyright (c) 2020 Peter Holm
+#
+# 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.
+#
+# $FreeBSD$
+#
+
+# A variation of systrace.sh
+# "Fatal trap 12: page fault while in kernel mode" seen:
+# https://people.freebsd.org/~pho/stress/log/mark142.txt
+
+[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
+. ../default.cfg
+dtrace -n 'dtrace:::BEGIN { exit(0); }' > /dev/null 2>&1 || exit 0
+
+echo "gvim or top should be running at this point"
+for i in `jot 2`; do
+	sleep 4 & pid=$!
+	dtrace -w -n 'fbt::kern_ioctl:entry {\
+	    @io[execname,probefunc] = count(); }' -p $pid > /dev/null 2>&1
+	wait $pid
+	kldstat | grep -q dtraceall.ko && kldunload dtraceall.ko
+	mount -t tmpfs dummy $mntpoint && umount $mntpoint
+done
+kldstat | grep -q tmpfs && kldunload tmpfs.ko
+exit 0

Property changes on: user/pho/stress2/misc/systrace2.sh
___________________________________________________________________
Added: svn:executable
## -0,0 +1 ##
+*
\ No newline at end of property