linux-kernel - Re: CVE-2025-40146: blk-mq: fix potential deadlock while nr

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Message-ID: <15fb6eed-e107-4ef7-a569-3328a02e2c39@huaweicloud.com>
Date: Thu, 27 Nov 2025 21:22:42 +0800
From: Zheng Qixing <zhengqixing@...weicloud.com>
To: gregkh@...uxfoundation.org
Cc: cve@...nel.org, gregkh@...nel.org, linux-cve-announce@...r.kernel.org,
 linux-kernel@...r.kernel.org, yukuai@...as.com, ming.lei@...hat.com,
 Nilay Shroff <nilay@...ux.ibm.com>, "zhangyi (F)" <yi.zhang@...wei.com>,
 yangerkun <yangerkun@...wei.com>, Hou Tao <houtao1@...wei.com>
Subject: Re: CVE-2025-40146: blk-mq: fix potential deadlock while nr_requests
 grown

Hi,

Commit b86433721f46 ("blk-mq: fix potential deadlock while nr_requests 
grown")  aims to avoid a deadlock issue when the queue is frozen and 
memory reclaim is triggered.

However, the sysfs nr_requests update path is already under a 
memalloc_noio_save() region while the queue is frozen (via 
blk_mq_freeze_queue()).

Would it be possible to reject this CVE, or clarify why it needs CVE 
assignment in this case?

Any feedback or further explanation would be appreciated.

Best regards,

Qixing