device-mapper-multipath/0021-multipathd-cancel-threads-early-during-shutdown.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Martin Wilck <mwilck@suse.com>
Date: Fri, 4 Jan 2019 17:10:25 +0100
Subject: [PATCH] multipathd: cancel threads early during shutdown
Cancel the other threads before taking vecs->lock. This avoids
delays during shutdown caused e.g. by the checker thread holding
the vecs lock.
Note: this makes it possible that cancelled threads leak memory,
because they can now be cancelled before having released the vecs
lock. I believe this is acceptable, as only threads are affected
that are cancelled during multipathd shutdown.
Cc: Chongyun Wu <wu.chongyun@h3c.com>
Reviewed-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
---
multipathd/main.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/multipathd/main.c b/multipathd/main.c
index 39aea4ad..d1f8cc1b 100644
--- a/multipathd/main.c
+++ b/multipathd/main.c
@@ -3073,23 +3073,24 @@ child (__attribute__((unused)) void *param)
}
}
- lock(&vecs->lock);
+ pthread_cancel(check_thr);
+ pthread_cancel(uevent_thr);
+ pthread_cancel(uxlsnr_thr);
+ pthread_cancel(uevq_thr);
+ if (poll_dmevents)
+ pthread_cancel(dmevent_thr);
+
conf = get_multipath_config();
queue_without_daemon = conf->queue_without_daemon;
put_multipath_config(conf);
+
+ lock(&vecs->lock);
if (queue_without_daemon == QUE_NO_DAEMON_OFF)
vector_foreach_slot(vecs->mpvec, mpp, i)
dm_queue_if_no_path(mpp->alias, 0);
remove_maps_and_stop_waiters(vecs);
unlock(&vecs->lock);
- pthread_cancel(check_thr);
- pthread_cancel(uevent_thr);
- pthread_cancel(uxlsnr_thr);
- pthread_cancel(uevq_thr);
- if (poll_dmevents)
- pthread_cancel(dmevent_thr);
-
pthread_join(check_thr, NULL);
pthread_join(uevent_thr, NULL);
pthread_join(uxlsnr_thr, NULL);
--
2.17.2