Dan, can you try the following patch?
diff --git a/block/blk-core.c b/block/blk-core.c index de771093b526..474462abfbdc 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1183,6 +1183,7 @@ void __blk_flush_plug(struct blk_plug *plug, bool from_schedule) if (unlikely(!rq_list_empty(plug->cached_rq))) blk_mq_free_plug_rqs(plug); } +EXPORT_SYMBOL(__blk_flush_plug);
/**
- blk_finish_plug - mark the end of a batch of submitted I/O
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 8497880135ee..26e09cdf46a3 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -6773,6 +6773,11 @@ static void raid5d(struct md_thread *thread) spin_unlock_irq(&conf->device_lock); md_check_recovery(mddev); spin_lock_irq(&conf->device_lock);
} else {- spin_unlock_irq(&conf->device_lock);
blk_flush_plug(&plug, false);cond_resched();spin_lock_irq(&conf->device_lock); } } pr_debug("%d stripes handled\n", handled);
This patch seems to work! I can no longer reproduce the problem after applying this.
Thanks,
-- Dan