Re: stalling IO regression since linux 5.12, through 5.18
From: Chris Murphy <hidden>
Date: 2022-08-19 19:21:37
Also in:
linux-block, linux-btrfs, lkml
On Thu, Aug 18, 2022, at 1:24 AM, Ming Lei wrote:
quoted hunk ↗ jump to hunk
On Thu, Aug 18, 2022 at 12:27:04AM -0400, Chris Murphy wrote:quoted
On Thu, Aug 18, 2022, at 12:18 AM, Chris Murphy wrote:quoted
On Thu, Aug 18, 2022, at 12:12 AM, Chris Murphy wrote:quoted
On Wed, Aug 17, 2022, at 11:41 PM, Ming Lei wrote:quoted
OK, can you post the blk-mq debugfs log after you trigger it on v5.17?Same boot, 3rd log. But the load is above 300 so I kinda need to sysrq+b soon. https://drive.google.com/file/d/1375H558kqPTdng439rvG6LuXXWPXLToo/view?usp=sharingAlso please test the following one too:diff --git a/block/blk-mq.c b/block/blk-mq.c index 5ee62b95f3e5..d01c64be08e2 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c@@ -1991,7 +1991,8 @@ bool blk_mq_dispatch_rq_list(struct blk_mq_hw_ctx*hctx, struct list_head *list, if (!needs_restart || (no_tag && list_empty_careful(&hctx->dispatch_wait.entry))) blk_mq_run_hw_queue(hctx, true); - else if (needs_restart && needs_resource) + else if (needs_restart && (needs_resource || + blk_mq_is_shared_tags(hctx->flags))) blk_mq_delay_run_hw_queue(hctx, BLK_MQ_RESOURCE_DELAY); blk_mq_update_dispatch_busy(hctx, true);
With just this patch on top of 5.17.0, it still hangs. I've captured block debugfs log: https://drive.google.com/file/d/1ic4YHxoL9RrCdy_5FNdGfh_q_J3d_Ft0/view?usp=sharing -- Chris Murphy