linux-kernel - Re: [PATCH v3] blk-throttle: fix access race during throttle policy activation

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Message-Id: <175734151062.534076.10128778772498989432.b4-ty@kernel.dk>
Date: Mon, 08 Sep 2025 08:25:10 -0600
From: Jens Axboe <axboe@...nel.dk>
To: yukuai1@...weicloud.com, linux-block@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Han Guangjiang <gj.han@...mail.com>
Cc: hanguangjiang@...iang.com, fanggeng@...iang.com, yangchen11@...iang.com, 
 liangjie@...iang.com
Subject: Re: [PATCH v3] blk-throttle: fix access race during throttle
 policy activation


On Fri, 05 Sep 2025 18:24:11 +0800, Han Guangjiang wrote:
> On repeated cold boots we occasionally hit a NULL pointer crash in
> blk_should_throtl() when throttling is consulted before the throttle
> policy is fully enabled for the queue. Checking only q->td != NULL is
> insufficient during early initialization, so blkg_to_pd() for the
> throttle policy can still return NULL and blkg_to_tg() becomes NULL,
> which later gets dereferenced.
> 
> [...]

Applied, thanks!

[1/1] blk-throttle: fix access race during throttle policy activation
      commit: bd9fd5be6bc0836820500f68fff144609fbd85a9

Best regards,
-- 
Jens Axboe