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

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Message-Id: <20241105113529.3257-1-hdanton@sina.com>
Date: Tue,  5 Nov 2024 19:35:29 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+949ae54e95a2fab4cbb4@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [block?] possible deadlock in __submit_bio

On Sun, 03 Nov 2024 14:19:28 -0800
> syzbot found the following issue on:
> 
> HEAD commit:    f9f24ca362a4 Add linux-next specific files for 20241031
> git tree:       linux-next
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16749340580000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git  f9f24ca362a4

--- x/block/blk.h
+++ y/block/blk.h
@@ -72,8 +72,6 @@ static inline int bio_queue_enter(struct
 	struct request_queue *q = bdev_get_queue(bio->bi_bdev);
 
 	if (blk_try_enter_queue(q, false)) {
-		rwsem_acquire_read(&q->io_lockdep_map, 0, 0, _RET_IP_);
-		rwsem_release(&q->io_lockdep_map, _RET_IP_);
 		return 0;
 	}
 	return __bio_queue_enter(q, bio);
--- x/block/blk-core.c
+++ y/block/blk-core.c
@@ -358,8 +358,6 @@ int __bio_queue_enter(struct request_que
 			goto dead;
 	}
 
-	rwsem_acquire_read(&q->io_lockdep_map, 0, 0, _RET_IP_);
-	rwsem_release(&q->io_lockdep_map, _RET_IP_);
 	return 0;
 dead:
 	bio_io_error(bio);
--