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| author | Yu Kuai <yukuai3@huawei.com> | 2023-05-29 15:28:22 +0200 |
|---|---|---|
| committer | Jes Sorensen <jes@trained-monkey.org> | 2023-10-26 23:24:28 +0200 |
| commit | 9d0fb58f3b1314678564b4ac7bfb19942acc8926 (patch) | |
| tree | 671649bf3a641c3ce33f51b795505a9432e74d81 /tests/24raid456deadlock | |
| parent | tests: add a regression test for raid10 deadlock (diff) | |
| download | mdadm-9d0fb58f3b1314678564b4ac7bfb19942acc8926.tar.xz mdadm-9d0fb58f3b1314678564b4ac7bfb19942acc8926.zip | |
tests: add a regression test for raid456 deadlock
The deadlock is described in [1], as the last patch described, it's
fixed first by [2], however this fix will be reverted and the deadlock
is supposed to be fixed by [3].
[1] https://lore.kernel.org/linux-raid/5ed54ffc-ce82-bf66-4eff-390cb23bc1ac@molgen.mpg.de/T/#t
[2] https://lore.kernel.org/linux-raid/20220621031129.24778-1-guoqing.jiang@linux.dev/
[3] https://lore.kernel.org/linux-raid/20230322064122.2384589-5-yukuai1@huaweicloud.com/
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Jes Sorensen <jes@trained-monkey.org>
Diffstat (limited to 'tests/24raid456deadlock')
| -rw-r--r-- | tests/24raid456deadlock | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/tests/24raid456deadlock b/tests/24raid456deadlock new file mode 100644 index 00000000..80e6e97e --- /dev/null +++ b/tests/24raid456deadlock @@ -0,0 +1,58 @@ +devs="$dev0 $dev1 $dev2 $dev3 $dev4 $dev5" +runtime=120 +pid="" +old=`cat /proc/sys/vm/dirty_background_ratio` + +test_write_action() +{ + while true; do + echo check > /sys/block/md0/md/sync_action &> /dev/null + sleep 0.1 + echo idle > /sys/block/md0/md/sync_action &> /dev/null + done +} + +test_write_back() +{ + fio -filename=$md0 -bs=4k -rw=write -numjobs=1 -name=test \ + -time_based -runtime=$runtime &> /dev/null +} + +set_up_test() +{ + fio -h &> /dev/null || die "fio not found" + + # create a simple raid6 + mdadm -Cv -R -n 6 -l6 $md0 $devs --assume-clean || die "create raid6 failed" + + # trigger dirty pages write back + echo 0 > /proc/sys/vm/dirty_background_ratio +} + +clean_up_test() +{ + echo $old > /proc/sys/vm/dirty_background_ratio + + pkill -9 fio + kill -9 $pid + + sleep 1 + + if ps $pid | tail -1 | awk '{print $3}' | grep D; then + die "thread that is writing sysfs is stuck in D state, deadlock is triggered" + fi + mdadm -S $md0 +} + +trap 'clean_up_test' EXIT + +set_up_test || die "set up test failed" + +test_write_back & + +test_write_action & +pid="$!" + +sleep $runtime + +exit 0 |