linux-kernel - [syzbot] [block?] WARNING in dd_exit

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Message-ID: <67442263.050a0220.1cc393.0069.GAE@google.com>
Date: Sun, 24 Nov 2024 23:08:19 -0800
From: syzbot <syzbot+f53c29806b4b263165f3@...kaller.appspotmail.com>
To: axboe@...nel.dk, linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [block?] WARNING in dd_exit_sched

Hello,

syzbot found the following issue on:

HEAD commit:    43fb83c17ba2 Merge tag 'soc-arm-6.13' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12280ec0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e796b1bf154f93a7
dashboard link: https://syzkaller.appspot.com/bug?extid=f53c29806b4b263165f3
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cdcbc016316b/disk-43fb83c1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f82505daa7c2/vmlinux-43fb83c1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/74b0b41d70c6/bzImage-43fb83c1.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f53c29806b4b263165f3@...kaller.appspotmail.com

------------[ cut here ]------------
statistics for priority 0: i 8 m 0 d 8 c 0
WARNING: CPU: 0 PID: 7130 at block/mq-deadline.c:562 dd_exit_sched+0x2a8/0x3a0 block/mq-deadline.c:559
Modules linked in:
CPU: 0 UID: 0 PID: 7130 Comm: kworker/u8:10 Not tainted 6.12.0-syzkaller-03657-g43fb83c17ba2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Workqueue: nbd-del nbd_dev_remove_work
RIP: 0010:dd_exit_sched+0x2a8/0x3a0 block/mq-deadline.c:559
Code: b6 44 25 00 84 c0 0f 85 dd 00 00 00 44 8b 0b 48 c7 c7 00 3a 5f 8c 8b 74 24 04 8b 54 24 08 44 89 f9 45 89 e8 e8 c9 af b2 fc 90 <0f> 0b 90 90 e9 03 ff ff ff 48 c7 c1 60 e7 1c 90 80 e1 07 80 c1 03
RSP: 0018:ffffc90004247910 EFLAGS: 00010246
RAX: 83929aab89e5bc00 RBX: ffff888024eb5c5c RCX: ffff888027a51e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 1ffff110049d6b8b R08: ffffffff8155f352 R09: fffffbfff1cfa88c
R10: dffffc0000000000 R11: fffffbfff1cfa88c R12: dffffc0000000000
R13: 0000000000000008 R14: ffff888024eb5c00 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe1d01f3f98 CR3: 0000000073672000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 blk_mq_exit_sched+0x2ce/0x4a0 block/blk-mq-sched.c:547
 elevator_exit+0x5e/0x80 block/elevator.c:159
 del_gendisk+0x7a8/0x930 block/genhd.c:735
 nbd_dev_remove drivers/block/nbd.c:264 [inline]
 nbd_dev_remove_work+0x47/0xe0 drivers/block/nbd.c:280
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>


---
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