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

[QiuLaibin]

Hi

On 2022/1/26 21:38, Jens Axboe wrote:
> 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.
Yes, QD = 1 from Alex Xu's must-see environment. I'm trying to build a 
must-see locally, and I will submit the repaired patch as soon as possible.

>

BR
Laibin