From 22481ce7438e2e16a7d870c957bfaed05d115037 Mon Sep 17 00:00:00 2001
From: Donald Buczek <buczek@molgen.mpg.de>
Date: Thu, 11 Mar 2021 13:35:34 +0100
Subject: [PATCH] mxraid: Add deadlock workaround to mdcheck.safe

Sometimes, when the check is paused by setting sync_action to "idle",
the array deadlocks. It can be continued by setting array_state to
active.

If it takes more 10 seconds to set the sync_action to idle and the array
state is write-pending, then try to continue the array by setting its
state to active.
---
 mxraid/mdcheck.safe | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/mxraid/mdcheck.safe b/mxraid/mdcheck.safe
index 700c3e2..01eda55 100755
--- a/mxraid/mdcheck.safe
+++ b/mxraid/mdcheck.safe
@@ -160,7 +160,13 @@ do
 		rm -f $fl
 		continue;
 	fi
-	echo idle > $sys/md/sync_action
+	echo idle > $sys/md/sync_action &
+	pid=$!
+	sleep 10
+	if [ -d /proc/$pid -a "$(cat $sys/md/array_state)" = write-pending ]; then
+		logger -p daemon.info restart hanging $dev
+		echo active > $sys/md/array_state
+	fi
 	cat $sys/md/sync_min > $fl
 	logger -p daemon.info pause checking $dev at `cat $fl`
 done