linux-kernel - Re: [PATCH v9] block: cancel all throttled bios in del

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Message-ID: <YhuyBgZSS6m/Mwu6@infradead.org>
Date:   Sun, 27 Feb 2022 09:16:54 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Yu Kuai <yukuai3@...wei.com>
Cc:     ming.lei@...hat.com, tj@...nel.org, axboe@...nel.dk,
        cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, yi.zhang@...wei.com
Subject: Re: [PATCH v9] block: cancel all throttled bios in del_gendisk()

On Thu, Feb 10, 2022 at 07:56:37PM +0800, Yu Kuai wrote:
> Throttled bios can't be issued after del_gendisk() is done, thus
> it's better to cancel them immediately rather than waiting for
> throttle is done.
> 
> For example, if user thread is throttled with low bps while it's
> issuing large io, and the device is deleted. The user thread will
> wait for a long time for io to return.

FYI, this crashed left rigt and center when running xfstests with
traces pointing to throtl_pending_timer_fn.