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

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Date:   Mon, 28 Feb 2022 14:11:30 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Yu Kuai <yukuai3@...wei.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()

Hi Christoph,

On Sun, Feb 27, 2022 at 09:16:54AM -0800, Christoph Hellwig wrote:
> 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.

Can you share the exact xfstests test(fs, test)? Or panic log?

I can't reproduce it when running './check -g auto' on XFS, meantime
tracking throtl_pending_timer_fn().


Thanks,
Ming