Thanks a lot for the testing! Can you also give following patch a try? It removes the change to blk_plug, because Dan and Song are worried about performance degradation, so we need to verify the performance before consider that patch.
Anyway, I think following patch can fix this problem as well.
Thanks, Kuai
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 3ad5f3c7f91e..ae8665be9940 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -6728,6 +6728,9 @@ static void raid5d(struct md_thread *thread) int batch_size, released; unsigned int offset;
if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags))goto skip;released = release_stripe_list(conf,conf->temp_inactive_list); if (released) clear_bit(R5_DID_ALLOC, &conf->cache_state); @@ -6766,6 +6769,7 @@ static void raid5d(struct md_thread *thread) spin_lock_irq(&conf->device_lock); } } +skip: pr_debug("%d stripes handled\n", handled);
spin_unlock_irq(&conf->device_lock);
Yes, this patch also seems to work. I cannot reproduce the problem on 6.8-rc7 or 6.8.1 with just this one applied.
Cheers!
-- Dan