[PATCH v2 blktests] block: add freeze/unfreeze sequence test

[PATCH v2 blktests] block: add freeze/unfreeze sequence test

[Bob Liu]

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>
---
 tests/block/022     | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/block/022.out |  2 ++
 2 files changed, 61 insertions(+)
 create mode 100755 tests/block/022
 create mode 100644 tests/block/022.out

diff --git a/tests/block/022 b/tests/block/022
new file mode 100755
index 0000000..e3ac197
--- /dev/null
+++ b/tests/block/022
@@ -0,0 +1,59 @@
+#!/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
index 0000000..14d43cb
--- /dev/null
+++ b/tests/block/022.out
@@ -0,0 +1,2 @@
+Running block/022
+Test complete
-- 
2.9.5

Re: [PATCH v2 blktests] block: add freeze/unfreeze sequence test

[Omar Sandoval]

On Tue, Jun 11, 2019 at 07:35:06AM +0800, Bob Liu wrote:
> Reproduce the hang fixed by
> 7996a8b5511a ("blk-mq: fix hang caused by freeze/unfreeze sequence").

Thanks, applied.