Re: [PATCH v9] block: cancel all throttled bios in del_gendisk()

[Christoph Hellwig]

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.