linux-kernel - Re: Fwd: Re: kernel BUG at drivers/scsi/scsi_error.c:197!

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Date:   Thu, 14 Jun 2018 14:31:35 +0300
From:   Andrew Randrianasulu <randrianasulu@...il.com>
To:     "hch@....de" <hch@....de>
Cc:     Bart Van Assche <Bart.VanAssche@....com>,
        "rdunlap@...radead.org" <rdunlap@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>
Subject: Re: Fwd: Re: kernel BUG at drivers/scsi/scsi_error.c:197! - git 4.17.0-x64-08428-g7d3bf613e99a

В сообщении от Thursday 14 June 2018 11:34:17 hch@....de написал(а):
> Andrew, can you test the patch below, please?

Patch seems to work as well as previous one - I can boot with no warnings and 
suspend/resume.

 Linux version 4.17.0-x64-11928-g2837461dbe6f-dirty

(sorry for some "AMD-Vi: Event logged" spam - it just sound acting strange 
sometimes, I filled additional bug about it in kernel bugzilla)

>
> ---
> From ccf385c63e30e8633b771604bed0e09c895e9175 Mon Sep 17 00:00:00 2001
> From: Christoph Hellwig <hch@....de>
> Date: Thu, 14 Jun 2018 10:25:36 +0200
> Subject: blk-mq: don't time out requests again that are in the timeout
> handler
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  block/blk-mq.c         | 5 +++++
>  include/linux/blkdev.h | 2 ++
>  2 files changed, 7 insertions(+)
>
> diff --git a/block/blk-mq.c b/block/blk-mq.c
> index e9da5e6a8526..54332db09e5d 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -671,6 +671,7 @@ static void __blk_mq_requeue_request(struct request
> *rq)
>
>  	if (blk_mq_request_started(rq)) {
>  		WRITE_ONCE(rq->state, MQ_RQ_IDLE);
> +		rq->rq_flags &= ~RQF_TIMED_OUT;
>  		if (q->dma_drain_size && blk_rq_bytes(rq))
>  			rq->nr_phys_segments--;
>  	}
> @@ -770,6 +771,7 @@ EXPORT_SYMBOL(blk_mq_tag_to_rq);
>
>  static void blk_mq_rq_timed_out(struct request *req, bool reserved)
>  {
> +	req->rq_flags |= RQF_TIMED_OUT;
>  	if (req->q->mq_ops->timeout) {
>  		enum blk_eh_timer_return ret;
>
> @@ -779,6 +781,7 @@ static void blk_mq_rq_timed_out(struct request *req,
> bool reserved) WARN_ON_ONCE(ret != BLK_EH_RESET_TIMER);
>  	}
>
> +	req->rq_flags &= ~RQF_TIMED_OUT;
>  	blk_add_timer(req);
>  }
>
> @@ -788,6 +791,8 @@ static bool blk_mq_req_expired(struct request *rq,
> unsigned long *next)
>
>  	if (blk_mq_rq_state(rq) != MQ_RQ_IN_FLIGHT)
>  		return false;
> +	if (rq->rq_flags & RQF_TIMED_OUT)
> +		return false;
>
>  	deadline = blk_rq_deadline(rq);
>  	if (time_after_eq(jiffies, deadline))
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index bca3a92eb55f..fa6f11751430 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -127,6 +127,8 @@ typedef __u32 __bitwise req_flags_t;
>  #define RQF_ZONE_WRITE_LOCKED	((__force req_flags_t)(1 << 19))
>  /* already slept for hybrid poll */
>  #define RQF_MQ_POLL_SLEPT	((__force req_flags_t)(1 << 20))
> +/* ->timeout has been called, don't expire again */
> +#define RQF_TIMED_OUT		((__force req_flags_t)(1 << 21))
>
>  /* flags that prevent us from merging requests: */
>  #define RQF_NOMERGE_FLAGS \



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