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Commit 4274215d authored by NeilBrown's avatar NeilBrown
Browse files

md: avoid endless recovery loop when waiting for fail device to complete. 



If a device fails in a way that causes pending request to take a while
to complete, md will not be able to immediately remove it from the
array in remove_and_add_spares.
It will then incorrectly look like a spare device and md will try to
recover it even though it is failed.
This leads to a recovery process starting and instantly aborting over
and over again.

We should check if the device is faulty before considering it to be a
spare.  This will avoid trying to start a recovery that cannot
proceed.

This bug was introduced in 2.6.26 so that patch is suitable for any
kernel since then.

Cc: stable@kernel.org
Reported-by: default avatarJim Paradis <james.paradis@stratus.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 2992c4bd

drivers/md/md.c

+1 −0
Original line number Diff line number Diff line
@@ -7088,6 +7088,7 @@ static int remove_and_add_spares(mddev_t *mddev) 
		list_for_each_entry(rdev, &mddev->disks, same_set) {

			if (rdev->raid_disk >= 0 &&

			    !test_bit(In_sync, &rdev->flags) &&

			    !test_bit(Faulty, &rdev->flags) &&

			    !test_bit(Blocked, &rdev->flags))

				spares++;

			if (rdev->raid_disk < 0