Re: stalling IO regression since linux 5.12, through 5.18
From: Chris Murphy <hidden>
Date: 2022-08-18 18:53:09
Also in:
linux-block, linux-btrfs, lkml
On Thu, Aug 18, 2022, at 1:15 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=sharingPlease test the following patch and see if it makes a difference:diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c index a4f7c101b53b..8e8d77e79dd6 100644 --- a/block/blk-mq-sched.c +++ b/block/blk-mq-sched.c@@ -44,7 +44,10 @@ void __blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx) */ smp_mb(); - blk_mq_run_hw_queue(hctx, true); + if (blk_mq_is_shared_tags(hctx->flags)) + blk_mq_run_hw_queues(hctx->queue, true); + else + blk_mq_run_hw_queue(hctx, true); } static int sched_rq_cmp(void *priv, const struct list_head *a,
I still get a stall. By the time I noticed it, I can't run any new commands (they just hang) so I had to sysrq+b. Let me know if I should rerun the test in order to capture block debug log. -- Chris Murphy