linux-kernel - Re: "blk-mq: fix tag_get wait task can't be awakened" causes hangs

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Date:   Wed, 26 Jan 2022 06:38:31 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     QiuLaibin <qiulaibin@...wei.com>,
        "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-block@...r.kernel.org
Cc:     john.garry@...wei.com, ming.lei@...hat.com,
        martin.petersen@...cle.com, hare@...e.de,
        akpm@...ux-foundation.org, bvanassche@....org,
        linux-kernel@...r.kernel.org
Subject: Re: "blk-mq: fix tag_get wait task can't be awakened" causes hangs

On 1/24/22 9:08 PM, QiuLaibin wrote:
> Hi Alex
> 
> 1、Please help to import this structure:
> 
> blk_mq_tags <= request_queue->blk_mq_hw_ctx->blk_mq_tags
> 
> If there is no kernel dump, help to see the value of
> 
> cat /sys/block/sda/mq/0/nr_tags
>                 __ <= Change it to the problem device
> 
> And how many block devices in total by lsblk.
> 
> 2、Please describe in detail how to reproduce the issue,
> 
> And what type of USB device?
> 
> 3、Please help to try the attachment patch and see if it can be reproduced.

Any progress on this? I strongly suspect that any QD=1 setup would
trivially show the issue, based on the reports.

-- 
Jens Axboe