block: add freeze/unfreeze sequence test

Reproduce the hang fixed by
7996a8b5511a ("blk-mq: fix hang caused by freeze/unfreeze sequence").

--
v2:
- Add 022.out

Signed-off-by: Bob Liu <bob.liu@oracle.com>

diff --git a/tests/block/022 b/tests/block/022
new file mode 100755 (executable)
index 0000000..1404aac
--- /dev/null
+++ b/tests/block/022
@@ -0,0 +1,58 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2019 Bob Liu <bob.liu@oracle.com>
+#
+# Test hang caused by freeze/unfreeze sequence. Regression
+# test for 7996a8b5511a ("blk-mq: fix hang caused by freeze/unfreeze sequence").
+
+. tests/block/rc
+. common/null_blk
+
+DESCRIPTION="Test hang caused by freeze/unfreeze sequence"
+TIMED=1
+
+requires() {
+       _have_null_blk && _have_module_param null_blk shared_tags
+}
+
+hotplug_test() {
+       while :
+       do
+               echo 1 > /sys/kernel/config/nullb/"$1"/power
+               echo 0 > /sys/kernel/config/nullb/"$1"/power
+       done
+}
+
+test() {
+       echo "Running ${TEST_NAME}"
+       : "${TIMEOUT:=30}"
+
+       if ! _init_null_blk shared_tags=1 nr_devices=0 queue_mode=2; then
+               return 1
+       fi
+
+       mkdir -p /sys/kernel/config/nullb/0
+       mkdir -p /sys/kernel/config/nullb/1
+       hotplug_test 0 &
+       pid0=$!
+       hotplug_test 1 &
+       pid1=$!
+
+       #bind process to two different CPU
+       taskset -p 1 $pid0 >/dev/null
+       taskset -p 2 $pid1 >/dev/null
+
+       sleep "$TIMEOUT"
+       {
+               kill -9 $pid0
+               wait $pid0
+               kill -9 $pid1
+               wait $pid1
+       } 2>/dev/null
+
+       rmdir /sys/kernel/config/nullb/1
+       rmdir /sys/kernel/config/nullb/0
+
+       _exit_null_blk
+       echo "Test complete"
+}

diff --git a/tests/block/022.out b/tests/block/022.out
new file mode 100644 (file)
index 0000000..14d43cb
--- /dev/null
+++ b/tests/block/022.out
@@ -0,0 +1,2 @@
+Running block/022
+Test complete