linux-kernel - [syzbot] WARNING in floppy_check

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Message-ID: <00000000000048a02c05da870806@google.com>
Date:   Fri, 18 Mar 2022 17:06:17 -0700
From:   syzbot <syzbot+43f787e4cfb1ef7b84a8@...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_check_events

Hello,

syzbot found the following issue on:

HEAD commit:    09688c0166e7 Linux 5.17-rc8
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13d09be9700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d35f9bc6884af6c9
dashboard link: https://syzkaller.appspot.com/bug?extid=43f787e4cfb1ef7b84a8
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: i386

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+43f787e4cfb1ef7b84a8@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 3 PID: 12378 at drivers/block/floppy.c:1000 schedule_bh drivers/block/floppy.c:1000 [inline]
WARNING: CPU: 3 PID: 12378 at drivers/block/floppy.c:1000 process_fd_request drivers/block/floppy.c:2851 [inline]
WARNING: CPU: 3 PID: 12378 at drivers/block/floppy.c:1000 floppy_check_events+0x44a/0x560 drivers/block/floppy.c:4082
Modules linked in:
CPU: 3 PID: 12378 Comm: kworker/3:181 Not tainted 5.17.0-rc8-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: events_freezable_power_ disk_events_workfn
RIP: 0010:schedule_bh drivers/block/floppy.c:1000 [inline]
RIP: 0010:process_fd_request drivers/block/floppy.c:2851 [inline]
RIP: 0010:floppy_check_events+0x44a/0x560 drivers/block/floppy.c:4082
Code: 05 17 81 02 0c 60 9b 7c 84 e8 62 f0 cf fc e9 ba fd ff ff 45 31 e4 e9 6e fc ff ff e8 20 70 43 fd e9 5b fd ff ff e8 86 f6 fb fc <0f> 0b eb b8 48 89 de 48 c7 c7 20 9f 6a 8c e8 33 e3 84 ff e9 e4 fb
RSP: 0018:ffffc90028107cb0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff88805cdd8000 RSI: ffffffff847cc9aa RDI: 0000000000000003
RBP: ffffffff907f72f0 R08: 0000000000000000 R09: ffffffff8c6b07a7
R10: ffffffff847cc961 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88802cd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f58f6db0 CR3: 0000000073008000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 disk_check_events+0xc2/0x420 block/disk-events.c:193
 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
 worker_thread+0x657/0x1110 kernel/workqueue.c:2454
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>


---
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