test: new lvcreate-raid1-error-read.sh

Test for MD RAID kernel bug in read_balance() preventing
reads of failed sectors to get rescheduled to another leg.

test/shell/lvcreate-raid1-read-error.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+# Copyright (C) 2018 Red Hat, Inc. All rights reserved.
+#
+# This copyrighted material is made available to anyone wishing to use,
+# modify, copy, or redistribute it subject to the terms and conditions
+# of the GNU General Public License v.2.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+SKIP_WITH_LVMLOCKD=1
+SKIP_WITH_LVMPOLLD=1
+
+. lib/inittest
+
+# Test for MD raid1 kernel bug causing read
+# errors on failing first leg sectors.
+
+# Create VG with 2 PVs
+aux prepare_vg 2 2
+
+# Create 2-legged raid1 LV
+lvcreate --yes --type raid1 --mirrors 1 --extents 1 --name $lv $vg
+aux wait_for_sync $vg $lv
+
+aux error_dev "$dev1" 20:500
+
+dd if=$DM_DEV_DIR/$vg/$lv iflag=direct,fullblock of=/dev/zero bs=128K count=1
+
+vgremove --force $vg