stress2: Added a regresson test

Submitted by: Andriy Gapon <avg@FreeBSD.org>

tools/test/stress2/misc/graid1_11.sh

@@ -0,0 +1,103 @@
+#!/bin/sh
+
+# g_mirror: don't fail reads while losing next-to-last disk
+
+# Fixed by https://cgit.FreeBSD.org/src/commit/?id=5d5f44623eb3d121d528060d131ee5d6bcd63489
+# Test scenario by: Andriy Gapon <avg@FreeBSD.org>
+
+set -u
+
+cleanup()
+{
+	echo "cleanup" 2>&1
+	gnop destroy -f ${dev1}.nop
+	gnop destroy -f ${dev2}.nop
+	gmirror destroy testmirror
+	mdconfig -d -u ${dev2#md}
+	mdconfig -d -u ${dev1#md}
+}
+
+list_descendants()
+{
+	local children
+
+	children=$(pgrep -P "$1")
+	for pid in $children ; do
+		list_descendants "$pid"
+	done
+	echo "$children"
+}
+
+# Note that the size of gnop providers is smaller than the
+# size of backing md-s to avoid gmirror auto-tasting.
+for i in 1 2; do
+	eval dev$i=$(mdconfig -a -t swap -s 1024m)
+	eval gnop create -d 8 -s 1000m \${dev$i}
+done
+
+trap cleanup EXIT INT TERM QUIT
+
+gmirror load 2>/dev/null || true
+gmirror label -b round-robin -F testmirror ${dev1}.nop ${dev2}.nop
+
+(
+	#my_pid=$(exec sh -c 'echo "$PPID"')
+
+	sleep 100000 &
+	sentry=$!
+
+	children=""
+	for i in $(seq 8) ; do
+		(
+		while dd if=/dev/mirror/testmirror of=/dev/null > /dev/null ; ds=$? ; [ $ds -eq 0 ] ; do
+			:
+		done
+		if [ $ds -lt 128 ] ; then
+			# Not killed
+			echo "dd exited with $ds" 1>&2
+			kill $sentry 2>/dev/null
+		fi
+		) &
+
+		children="${children:+${children},}$!"
+
+		sleep 0.1
+	done
+
+	wait $sentry
+	pkill -P ${children} -x dd
+
+	# Reap background children
+	wait
+) &
+runner=$!
+
+# Give dd-s some time to get running
+sleep 2
+
+# Destroy one of the members
+echo "destroying one member" 1>&2
+gnop destroy -f ${dev1}.nop
+
+count=0
+while kill -0 $runner 2>/dev/null && [ $count -lt 5 ] ; do
+	sleep 1
+	count=$((count + 1))
+done
+
+if ! kill -0 $runner 2>/dev/null ; then
+	echo "the test has self-terminated" 1>&2
+	ret=1
+else
+	echo "the test is stuck, killing..." 1>&2
+	ret=0
+	kill $(list_descendants $runner) 2>/dev/null
+fi
+
+# Reap background processes
+wait
+
+# Just in case
+sleep 5
+
+exit $ret