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-rw-r--r--tests/24raid456deadlock58
1 files changed, 58 insertions, 0 deletions
diff --git a/tests/24raid456deadlock b/tests/24raid456deadlock
new file mode 100644
index 0000000..80e6e97
--- /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