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

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Message-ID: <000000000000ddf5f505f86fbd72@google.com>
Date:   Mon, 03 Apr 2023 07:54:54 -0700
From:   syzbot <syzbot+1d4201dfe9f2386fdc0b@...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] [block?] WARNING in process_fd_request

Hello,

syzbot found the following issue on:

HEAD commit:    ffe78bbd5121 Merge tag 'xtensa-20230327' of https://github..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=146bbb71c80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d40b592130bb7abb
dashboard link: https://syzkaller.appspot.com/bug?extid=1d4201dfe9f2386fdc0b
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+1d4201dfe9f2386fdc0b@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 29261 at drivers/block/floppy.c:999 schedule_bh drivers/block/floppy.c:999 [inline]
WARNING: CPU: 0 PID: 29261 at drivers/block/floppy.c:999 process_fd_request+0x6b/0x70 drivers/block/floppy.c:2847
Modules linked in:
CPU: 0 PID: 29261 Comm: kworker/u8:17 Not tainted 6.3.0-rc4-syzkaller-00039-gffe78bbd5121 #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+0x6b/0x70 drivers/block/floppy.c:2847
Code: fc 5b bf 08 00 00 00 48 c7 c2 c0 78 45 8d 48 8b 35 6a a3 ec 0c 48 c7 05 7f 9e ec 0c b0 8c 1c 85 e9 ea 70 36 fc e8 05 6d 66 fc <0f> 0b eb ce 90 48 b8 00 00 00 00 00 fc ff df 41 55 49 89 fd 41 54
RSP: 0018:ffffc90002f7fcf0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff88801d64ba80 RSI: ffffffff851c6b4b RDI: 0000000000000001
RBP: 0000000000000282 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90002f7fda8
R13: ffffffff8d457950 R14: ffff88800019f200 R15: ffff888012489000
FS:  0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000584eb404 CR3: 0000000023f74000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 floppy_shutdown+0x135/0x230 drivers/block/floppy.c:1889
 process_one_work+0x991/0x15c0 kernel/workqueue.c:2390
 worker_thread+0x669/0x1090 kernel/workqueue.c:2537
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>


---
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