This is a note to let you know that I've just added the patch titled
md: avoid possible spinning md thread at shutdown.
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
md-avoid-possible-spinning-md-thread-at-shutdown.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0f62fb220aa4ebabe8547d3a9ce4a16d3c045f21 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@xxxxxxx>
Date: Tue, 6 May 2014 09:36:08 +1000
Subject: md: avoid possible spinning md thread at shutdown.
From: NeilBrown <neilb@xxxxxxx>
commit 0f62fb220aa4ebabe8547d3a9ce4a16d3c045f21 upstream.
If an md array with externally managed metadata (e.g. DDF or IMSM)
is in use, then we should not set safemode==2 at shutdown because:
1/ this is ineffective: user-space need to be involved in any 'safemode' handling,
2/ The safemode management code doesn't cope with safemode==2 on external metadata
and md_check_recover enters an infinite loop.
Even at shutdown, an infinite-looping process can be problematic, so this
could cause shutdown to hang.
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/md.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8167,7 +8167,8 @@ static int md_notify_reboot(struct notif
if (mddev_trylock(mddev)) {
if (mddev->pers)
__md_stop_writes(mddev);
- mddev->safemode = 2;
+ if (mddev->persistent)
+ mddev->safemode = 2;
mddev_unlock(mddev);
}
need_delay = 1;
Patches currently in stable-queue which might be from neilb@xxxxxxx are
queue-3.4/md-avoid-possible-spinning-md-thread-at-shutdown.patch
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