linux-kernel - [syzbot] WARNING in schedule

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Date:   Mon, 07 Feb 2022 13:15:20 -0800
From:   syzbot <syzbot+e89a1109c376e2c3c389@...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 schedule_bh (2)

syzbot has found a reproducer for the following issue on:

HEAD commit:    dfd42facf1e4 Linux 5.17-rc3
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=145b5a28700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=266de9da75c71a45
dashboard link: https://syzkaller.appspot.com/bug?extid=e89a1109c376e2c3c389
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: i386
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15572b0c700000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1220d968700000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e89a1109c376e2c3c389@...kaller.appspotmail.com

floppy1: floppy timeout called
------------[ cut here ]------------
WARNING: CPU: 0 PID: 11 at drivers/block/floppy.c:1000 schedule_bh+0x5f/0x70 drivers/block/floppy.c:1000
Modules linked in:
CPU: 0 PID: 11 Comm: kworker/u16:1 Not tainted 5.17.0-rc3-syzkaller #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+0x5f/0x70 drivers/block/floppy.c:1000
Code: d7 65 fd fc 48 89 2d 20 c8 03 0c 5b 48 c7 c2 80 d0 6a 8c 48 8b 35 f1 cc 03 0c bf 08 00 00 00 5d e9 46 9a d1 fc e8 b1 65 fd fc <0f> 0b eb d1 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 e8 9b 65 fd fc
RSP: 0018:ffffc900003cfcf8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff888010feba00 RSI: ffffffff847b12df RDI: 0000000000000003
RBP: ffffffff847bc790 R08: 0000000000000000 R09: ffffffff8c6ad087
R10: ffffffff847b12af R11: 0000000000000000 R12: 0000000000000001
R13: ffffc900003cfdb8 R14: ffff888010db3e00 R15: ffff888010c71800
FS:  0000000000000000(0000) GS:ffff88802cb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f7ea1db0 CR3: 000000001f15c000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 floppy_shutdown+0x129/0x170 drivers/block/floppy.c:1890
 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>