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Date: Wed, 18 May 2022 08:39:16 +0800 From: QiuLaibin <qiulaibin@...wei.com> To: Jens Axboe <axboe@...nel.dk> CC: <tj@...nel.org>, <cgroups@...r.kernel.org>, <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Ming Lei <ming.lei@...hat.com> Subject: Re: [PATCH -next v2] blk-throttle: Set BIO_THROTTLED when bio has been throttled friendly ping.... 在 2022/3/2 21:51, Ming Lei 写道: > On Tue, Mar 01, 2022 at 08:39:19PM +0800, Laibin Qiu wrote: >> 1.In current process, all bio will set the BIO_THROTTLED flag >> after __blk_throtl_bio(). >> >> 2.If bio needs to be throttled, it will start the timer and >> stop submit bio directly. Bio will submit in >> blk_throtl_dispatch_work_fn() when the timer expires.But in >> the current process, if bio is throttled. The BIO_THROTTLED >> will be set to bio after timer start. If the bio has been >> completed, it may cause use-after-free blow. >> >> BUG: KASAN: use-after-free in blk_throtl_bio+0x12f0/0x2c70 >> Read of size 2 at addr ffff88801b8902d4 by task fio/26380 > > After the queue lock is released, the bio can be dispatched & completed, > so it shouldn't be touched after lock release: > > Reviewed-by: Ming Lei <ming.lei@...hat.com> > > Thanks, > Ming > > .
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