linux-kernel - Re: [syzbot] WARNING in wait_til

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Message-ID: <000000000000743f8505e0188496@google.com>
Date:   Sat, 28 May 2022 13:46:29 -0700
From:   syzbot <syzbot+3562be49b8e09d424a6f@...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: Re: [syzbot] WARNING in wait_til_done

syzbot has found a reproducer for the following issue on:

HEAD commit:    9d004b2f4fea Merge tag 'cxl-for-5.19' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=118576f3f00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=34d5ab77e4ca65e1
dashboard link: https://syzkaller.appspot.com/bug?extid=3562be49b8e09d424a6f
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10f15913f00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=157ad36bf00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3562be49b8e09d424a6f@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 3690 at drivers/block/floppy.c:999 schedule_bh drivers/block/floppy.c:999 [inline]
WARNING: CPU: 0 PID: 3690 at drivers/block/floppy.c:999 wait_til_done+0x350/0x3c0 drivers/block/floppy.c:2018
Modules linked in:
CPU: 0 PID: 3690 Comm: syz-executor202 Not tainted 5.18.0-syzkaller-10643-g9d004b2f4fea #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 8e 1e e0 fc 4c 89 e6 48 c7 c7 20 7b 8e 8c e8 8f b4 c0 fc e8 7a 1e e0 fc e9 c3 fd ff ff e8 70 1e e0 fc <0f> 0b e9 4b fd ff ff e8 54 38 2c fd e9 0f fe ff ff e8 5a 1e e0 fc
RSP: 0018:ffffc90002f8f718 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff920005f1ee3 RCX: 0000000000000000
RDX: ffff88801430c140 RSI: ffffffff84998450 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff84995460 R14: 0000000000000000 R15: 0000000000000003
FS:  0000555556c30300(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000088 CR3: 000000002457a000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 floppy_check_events+0x3d0/0x560 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+0x12c/0x310 block/disk-events.c:279
 floppy_open+0x75d/0xd70 drivers/block/floppy.c:4057
 blkdev_get_whole+0x99/0x2d0 block/bdev.c:673
 blkdev_get_by_dev.part.0+0x5ec/0xb90 block/bdev.c:823
 blkdev_get_by_dev+0x6b/0x80 block/bdev.c:857
 blkdev_open+0x13c/0x2c0 block/fops.c:481
 do_dentry_open+0x4a1/0x11f0 fs/open.c:824
 do_open fs/namei.c:3477 [inline]
 path_openat+0x1c71/0x2910 fs/namei.c:3610
 do_filp_open+0x1aa/0x400 fs/namei.c:3637
 do_sys_openat2+0x16d/0x4c0 fs/open.c:1254
 do_sys_open fs/open.c:1270 [inline]
 __do_sys_openat fs/open.c:1286 [inline]
 __se_sys_openat fs/open.c:1281 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1281
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f936c227597
Code: 25 00 00 41 00 3d 00 00 41 00 74 47 64 8b 04 25 18 00 00 00 85 c0 75 6b 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 95 00 00 00 48 8b 4c 24 28 64 48 2b 0c 25
RSP: 002b:00007ffc43d5dfb0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f936c227597
RDX: 0000000000000000 RSI: 00007ffc43d5e030 RDI: 00000000ffffff9c
RBP: 00007ffc43d5e030 R08: 000000000000ffff R09: 00007ffc43d5dec0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
 </TASK>