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Date:   Fri, 26 Nov 2021 17:10:15 +0800
From:   Ming Lei <ming.lei@redhat.com>
To:     Yi Zhang <yi.zhang@redhat.com>
Cc:     linux-block@vger.kernel.org
Subject: Re: [bug report] WARNING at block/mq-deadline.c:600
 dd_exit_sched+0x1c6/0x260 triggered with blktests block/031
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Hi Yi,

On Fri, Nov 26, 2021 at 11:45:14AM +0800, Yi Zhang wrote:
> Hi MIng
> It still can be reproduced with the latest for-next[1].
> BTW, it was only reproduced when I first time run block/031, cannot be
> reproduced if I run it the second time.

Firstly can you reproduce it on v5.16-rc2?

Secondly, can you collect the bpftrace log via the attached script when
running block/031?

#!/usr/bin/bpftrace
#include <linux/blkdev.h>
#include <linux/blk-mq.h>
#include <linux/genhd.h>

kprobe:dd_insert_request
{
	$rq = (struct request *)arg1;

	if (!($rq->rq_flags & (1 << 12))) {
		printf("%lu %16s %d %d: %s rq %lx/%x %s\n", nsecs / 1000,  comm, pid, cpu,
			ksym(reg("ip")), $rq->cmd_flags, $rq->rq_flags,
			kstack);
	}
}


Thanks,
Ming