linux-kernel - [syzbot] WARNING in floppy

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Date:   Thu, 01 Sep 2022 11:43:30 -0700
From:   syzbot <syzbot+046fef2eab0d7c657ca0@...kaller.appspotmail.com>
To:     axboe@...nel.dk, efremov@...ux.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] WARNING in floppy_shutdown

Hello,

syzbot found the following issue on:

HEAD commit:    10d4879f9ef0 Merge tag 'thermal-6.0-rc3' of git://git.kern..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13ba5d33080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=312be25752c7fe30
dashboard link: https://syzkaller.appspot.com/bug?extid=046fef2eab0d7c657ca0
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+046fef2eab0d7c657ca0@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 2 PID: 3723 at drivers/block/floppy.c:999 schedule_bh drivers/block/floppy.c:999 [inline]
WARNING: CPU: 2 PID: 3723 at drivers/block/floppy.c:999 process_fd_request drivers/block/floppy.c:2847 [inline]
WARNING: CPU: 2 PID: 3723 at drivers/block/floppy.c:999 floppy_shutdown.cold+0x7b/0xaa drivers/block/floppy.c:1892
Modules linked in:
CPU: 2 PID: 3723 Comm: kworker/u16:3 Not tainted 6.0.0-rc2-syzkaller-00283-g10d4879f9ef0 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: floppy floppy_shutdown
RIP: 0010:schedule_bh drivers/block/floppy.c:999 [inline]
RIP: 0010:process_fd_request drivers/block/floppy.c:2847 [inline]
RIP: 0010:floppy_shutdown.cold+0x7b/0xaa drivers/block/floppy.c:1892
Code: 05 7e 95 f9 07 20 66 63 8a e8 99 37 77 f8 48 8b 1d 72 43 60 03 31 ff 83 e3 01 89 de e8 16 8b 2b f8 84 db 74 07 e8 8d 8e 2b f8 <0f> 0b e8 86 8e 2b f8 48 8b 35 0f 94 f9 07 bf 08 00 00 00 48 c7 c2
RSP: 0018:ffffc90003147d00 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff888014c16080 RSI: ffffffff894fab83 RDI: 0000000000000001
RBP: 0000000000000282 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
R13: ffffc90003147da8 R14: ffff888014efd100 R15: ffff888011875800
FS:  0000000000000000(0000) GS:ffff88802c800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563743531680 CR3: 000000001a5d6000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 process_one_work+0x991/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>


---
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