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

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Date:   Thu, 06 Apr 2023 09:51:41 -0700
From:   syzbot <syzbot+9bc4da690ee5334f5d15@...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 wait_til_done (2)

Hello,

syzbot found the following issue on:

HEAD commit:    148341f0a2f5 Merge tag 'vfs.misc.fixes.v6.3-rc6' of git://..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12a10d3ec80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=adfc55aec6afccdd
dashboard link: https://syzkaller.appspot.com/bug?extid=9bc4da690ee5334f5d15
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+9bc4da690ee5334f5d15@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 793 at drivers/block/floppy.c:999 schedule_bh drivers/block/floppy.c:999 [inline]
WARNING: CPU: 0 PID: 793 at drivers/block/floppy.c:999 wait_til_done+0x350/0x3c0 drivers/block/floppy.c:2018
Modules linked in:
CPU: 0 PID: 793 Comm: syz-executor.1 Not tainted 6.3.0-rc5-syzkaller-00005-g148341f0a2f5 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:schedule_bh drivers/block/floppy.c:999 [inline]
RIP: 0010:wait_til_done+0x350/0x3c0 drivers/block/floppy.c:2018
Code: fc 41 83 fd 01 7e ac e8 4e 7f 66 fc 4c 89 e6 48 c7 c7 e0 d4 44 8d e8 3f 7b 44 fc e8 3a 7f 66 fc e9 c3 fd ff ff e8 30 7f 66 fc <0f> 0b e9 4b fd ff ff e8 64 9f b6 fc e9 0f fe ff ff e8 1a 7f 66 fc
RSP: 0018:ffffc90004d4f738 EFLAGS: 00010216
RAX: 0000000000000b2f RBX: 1ffff920009a9ee7 RCX: ffffc900027ca000
RDX: 0000000000040000 RSI: ffffffff851b7940 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff851b35c0 R14: 0000000000000000 R15: 0000000000000003
FS:  00007fed1de7c700(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc84fd52d38 CR3: 000000006e24b000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 floppy_check_events+0x35e/0x680 drivers/block/floppy.c:4098
 disk_check_events+0xc2/0x420 block/disk-events.c:193
 disk_clear_events block/disk-events.c:248 [inline]
 bdev_check_media_change+0x130/0x360 block/disk-events.c:279
 floppy_open+0x879/0xe90 drivers/block/floppy.c:4057
 blkdev_get_whole+0x99/0x2d0 block/bdev.c:594
 blkdev_get_by_dev.part.0+0x5e0/0xb80 block/bdev.c:744
 blkdev_get_by_dev+0x6f/0x90 block/bdev.c:778
 blkdev_open+0x140/0x2c0 block/fops.c:493
 do_dentry_open+0x6cc/0x13f0 fs/open.c:920
 do_open fs/namei.c:3560 [inline]
 path_openat+0x1baa/0x2750 fs/namei.c:3715
 do_filp_open+0x1ba/0x410 fs/namei.c:3742
 do_sys_openat2+0x16d/0x4c0 fs/open.c:1348
 do_sys_open fs/open.c:1364 [inline]
 __do_sys_openat fs/open.c:1380 [inline]
 __se_sys_openat fs/open.c:1375 [inline]
 __x64_sys_openat+0x143/0x1f0 fs/open.c:1375
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fed1d03e2f4
Code: Unable to access opcode bytes at 0x7fed1d03e2ca.
RSP: 002b:00007fed1de7bca0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00007fed1d03e2f4
RDX: 0000000000000000 RSI: 00007fed1de7bd40 RDI: 00000000ffffff9c
RBP: 00007fed1de7bd40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007ffe2ee6a22f R14: 00007fed1de7c300 R15: 0000000000022000
 </TASK>


---
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