tests: add a regression test that raid456 can't assemble

If recovery is interrupted and reshape is started, then this array can't
assemble anymore. The problem is supposed to be fixed by [1].

[1] https://lore.kernel.org/linux-raid/20230529031045.1760883-1-yukuai1@huaweicloud.com/

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Jes Sorensen <jes@trained-monkey.org>

diff --git a/tests/25raid456-reshape-while-recovery b/tests/25raid456-reshape-while-recovery
new file mode 100644 (file)
index 0000000..b9f871f
--- /dev/null
+++ b/tests/25raid456-reshape-while-recovery
@@ -0,0 +1,32 @@
+devs="$dev0 $dev1 $dev2"
+
+set_up_test()
+{
+       mdadm -Cv -R -n 3 -l5 $md0 $devs --assume-clean --size=50M || die "create array failed"
+       mdadm -a $md0 $dev3 $dev4 || die "failed to bind new disk to array"
+       echo 1000 > /sys/block/md0/md/sync_speed_max
+}
+
+clean_up_test()
+{
+       mdadm -S $md0
+}
+
+trap 'clean_up_test' EXIT
+
+set_up_test || die "set up test failed"
+
+# set up replacement
+echo want_replacement > /sys/block/md0/md/rd0/state
+sleep 1
+
+# trigger reshape
+echo frozen > /sys/block/md0/md/sync_action
+mdadm --grow -l 6 $md0
+sleep 1
+
+# reassemeble array
+mdadm -S $md0 || die "can't stop array"
+mdadm --assemble $md0 $devs $dev3 $dev4 || die "can't assemble array"
+
+exit 0