From: Benjamin Marzinski Date: Tue, 2 Jul 2024 15:02:48 +0000 (+0200) Subject: dm-raid: Fix WARN_ON_ONCE check for sync_thread in raid_resume X-Git-Tag: v6.11-rc1~113^2~19 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=3199a34bfaf7561410e0be1e33a61eba870768fc;p=thirdparty%2Flinux.git dm-raid: Fix WARN_ON_ONCE check for sync_thread in raid_resume rm-raid devices will occasionally trigger the following warning when being resumed after a table load because DM_RECOVERY_RUNNING is set: WARNING: CPU: 7 PID: 5660 at drivers/md/dm-raid.c:4105 raid_resume+0xee/0x100 [dm_raid] The failing check is: WARN_ON_ONCE(test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)); This check is designed to make sure that the sync thread isn't registered, but md_check_recovery can set MD_RECOVERY_RUNNING without the sync_thread ever getting registered. Instead of checking if MD_RECOVERY_RUNNING is set, check if sync_thread is non-NULL. Fixes: 16c4770c75b1 ("dm-raid: really frozen sync_thread during suspend") Suggested-by: Yu Kuai Signed-off-by: Benjamin Marzinski Reviewed-by: Yu Kuai Signed-off-by: Mikulas Patocka --- diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index 052c00c1eb154..a790d6a82e141 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -4101,10 +4101,11 @@ static void raid_resume(struct dm_target *ti) if (mddev->delta_disks < 0) rs_set_capacity(rs); + mddev_lock_nointr(mddev); WARN_ON_ONCE(!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)); - WARN_ON_ONCE(test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)); + WARN_ON_ONCE(rcu_dereference_protected(mddev->sync_thread, + lockdep_is_held(&mddev->reconfig_mutex))); clear_bit(RT_FLAG_RS_FROZEN, &rs->runtime_flags); - mddev_lock_nointr(mddev); mddev->ro = 0; mddev->in_sync = 0; md_unfrozen_sync_thread(mddev);