5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yu Kuai <yukuai3@xxxxxxxxxx> [ Upstream commit 95009ae904b1e9dca8db6f649f2d7c18a6e42c75 ] The lockdep assert is added by commit a448af25becf ("md/raid10: remove rcu protection to access rdev from conf") in print_conf(). And I didn't notice that dm-raid is calling "pers->hot_add_disk" without holding 'reconfig_mutex'. "pers->hot_add_disk" read and write many fields that is protected by 'reconfig_mutex', and raid_resume() already grab the lock in other contex. Hence fix this problem by protecting "pers->host_add_disk" with the lock. Fixes: 9092c02d9435 ("DM RAID: Add ability to restore transiently failed devices on resume") Fixes: a448af25becf ("md/raid10: remove rcu protection to access rdev from conf") Cc: stable@xxxxxxxxxxxxxxx # v6.7+ Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx> Signed-off-by: Xiao Ni <xni@xxxxxxxxxx> Acked-by: Mike Snitzer <snitzer@xxxxxxxxxx> Signed-off-by: Song Liu <song@xxxxxxxxxx> Link: https://lore.kernel.org/r/20240305072306.2562024-10-yukuai1@xxxxxxxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/md/dm-raid.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index 1ccd765fad938..25eecb92f5f38 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -4027,7 +4027,9 @@ static void raid_resume(struct dm_target *ti) * Take this opportunity to check whether any failed * devices are reachable again. */ + mddev_lock_nointr(mddev); attempt_restore_of_faulty_devices(rs); + mddev_unlock(mddev); } if (test_and_clear_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags)) { -- 2.43.0