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88 lines
2.2 KiB
88 lines
2.2 KiB
From 9d0fb58f3b1314678564b4ac7bfb19942acc8926 Mon Sep 17 00:00:00 2001
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From: Yu Kuai <yukuai3@huawei.com>
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Date: Mon, 29 May 2023 21:28:22 +0800
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Subject: [PATCH 147/165] tests: add a regression test for raid456 deadlock
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The deadlock is described in [1], as the last patch described, it's
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fixed first by [2], however this fix will be reverted and the deadlock
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is supposed to be fixed by [3].
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[1] https://lore.kernel.org/linux-raid/5ed54ffc-ce82-bf66-4eff-390cb23bc1ac@molgen.mpg.de/T/#t
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[2] https://lore.kernel.org/linux-raid/20220621031129.24778-1-guoqing.jiang@linux.dev/
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[3] https://lore.kernel.org/linux-raid/20230322064122.2384589-5-yukuai1@huaweicloud.com/
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Signed-off-by: Yu Kuai <yukuai3@huawei.com>
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Signed-off-by: Jes Sorensen <jes@trained-monkey.org>
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---
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tests/24raid456deadlock | 58 +++++++++++++++++++++++++++++++++++++++++
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1 file changed, 58 insertions(+)
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create mode 100644 tests/24raid456deadlock
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diff --git a/tests/24raid456deadlock b/tests/24raid456deadlock
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new file mode 100644
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index 00000000..80e6e97e
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--- /dev/null
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+++ b/tests/24raid456deadlock
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@@ -0,0 +1,58 @@
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+devs="$dev0 $dev1 $dev2 $dev3 $dev4 $dev5"
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+runtime=120
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+pid=""
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+old=`cat /proc/sys/vm/dirty_background_ratio`
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+
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+test_write_action()
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+{
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+ while true; do
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+ echo check > /sys/block/md0/md/sync_action &> /dev/null
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+ sleep 0.1
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+ echo idle > /sys/block/md0/md/sync_action &> /dev/null
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+ done
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+}
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+
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+test_write_back()
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+{
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+ fio -filename=$md0 -bs=4k -rw=write -numjobs=1 -name=test \
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+ -time_based -runtime=$runtime &> /dev/null
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+}
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+
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+set_up_test()
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+{
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+ fio -h &> /dev/null || die "fio not found"
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+
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+ # create a simple raid6
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+ mdadm -Cv -R -n 6 -l6 $md0 $devs --assume-clean || die "create raid6 failed"
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+
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+ # trigger dirty pages write back
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+ echo 0 > /proc/sys/vm/dirty_background_ratio
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+}
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+
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+clean_up_test()
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+{
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+ echo $old > /proc/sys/vm/dirty_background_ratio
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+
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+ pkill -9 fio
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+ kill -9 $pid
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+
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+ sleep 1
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+
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+ if ps $pid | tail -1 | awk '{print $3}' | grep D; then
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+ die "thread that is writing sysfs is stuck in D state, deadlock is triggered"
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+ fi
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+ mdadm -S $md0
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+}
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+
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+trap 'clean_up_test' EXIT
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+
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+set_up_test || die "set up test failed"
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+
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+test_write_back &
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+
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+test_write_action &
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+pid="$!"
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+
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+sleep $runtime
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+
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+exit 0
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--
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2.40.1
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