linux-kernel - Re: [syzbot] [kernfs?] possible deadlock in kernfs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <tencent_12A5C08DB79240DDA95D9119784FA08DAC07@qq.com>
Date: Thu,  7 Aug 2025 22:15:43 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+2d7d0fbb5fb979113ff3@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kernfs?] possible deadlock in kernfs_remove

#syz test

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 9692fa4c3ef2..0d69572fe1ce 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -4443,8 +4443,11 @@ struct gendisk *__blk_mq_alloc_disk(struct blk_mq_tag_set *set,
 {
 	struct request_queue *q;
 	struct gendisk *disk;
+	unsigned int nofs_flag;
 
+	nofs_flag = memalloc_nofs_save();
 	q = blk_mq_alloc_queue(set, lim, queuedata);
+	memalloc_nofs_restore(nofs_flag);
 	if (IS_ERR(q))
 		return ERR_CAST(q);