[syzbot] [block?] WARNING in __floppy_read_block_0 (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 9f3ebbef746f Merge tag '6.6-rc3-ksmbd-server-fixes' of git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10791e92680000
kernel config: https://syzkaller.appspot.com/x/.config?x=8d7d7928f78936aa
dashboard link: https://syzkaller.appspot.com/bug?extid=06ecd359d1a53c832788
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-9f3ebbef.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8528a3384270/vmlinux-9f3ebbef.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c33152bfb49a/bzImage-9f3ebbef.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+06ecd3...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 3 PID: 11841 at drivers/block/floppy.c:999 schedule_bh drivers/block/floppy.c:999 [inline]
WARNING: CPU: 3 PID: 11841 at drivers/block/floppy.c:999 process_fd_request drivers/block/floppy.c:2847 [inline]
WARNING: CPU: 3 PID: 11841 at drivers/block/floppy.c:999 __floppy_read_block_0.isra.0+0x2c2/0x360 drivers/block/floppy.c:4161
Modules linked in:

CPU: 3 PID: 11841 Comm: syz-executor.1 Not tainted 6.6.0-rc3-syzkaller-00146-g9f3ebbef746f #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:schedule_bh drivers/block/floppy.c:999 [inline]
RIP: 0010:process_fd_request drivers/block/floppy.c:2847 [inline]
RIP: 0010:__floppy_read_block_0.isra.0+0x2c2/0x360 drivers/block/floppy.c:4161
Code: c0 01 00 00 65 48 2b 04 25 28 00 00 00 0f 85 a1 00 00 00 48 81 c4 c8 01 00 00 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 8e 34 49 fc <0f> 0b e9 58 ff ff ff e8 c2 23 9e fc e9 88 fe ff ff e8 78 34 49 fc
RSP: 0018:ffffc9000d64fa60 EFLAGS: 00010293

RAX: 0000000000000000 RBX: 1ffff92001ac9f4d RCX: 0000000000000000
RDX: ffff88801b9f9600 RSI: ffffffff853d9082 RDI: 0000000000000001
RBP: ffffea0000b21480 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: 000000000000000c R14: ffffc9000d64fab8 R15: dffffc0000000000
FS: 00007f9a7f9576c0(0000) GS:ffff88806b900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9a7ed980c0 CR3: 000000004b01c000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
floppy_revalidate.isra.0+0x886/0xca0 drivers/block/floppy.c:4207
invalidate_drive+0xe8/0x110 drivers/block/floppy.c:3219
fd_locked_ioctl+0xb9b/0x1a10 drivers/block/floppy.c:3508
fd_ioctl+0x38/0x50 drivers/block/floppy.c:3576
blkdev_ioctl+0x2f9/0x770 block/ioctl.c:630
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f9a7ec7cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9a7f9570c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9a7ed9bf80 RCX: 00007f9a7ec7cae9
RDX: 0000000000000000 RSI: 000000000000024b RDI: 0000000000000003
RBP: 00007f9a7ecc847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f9a7ed9bf80 R15: 00007fffc2236268
</TASK>


---
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[Jens Axboe]

I'll keep saying this:

https://lore.kernel.org/all/7df3e30a-aa31-495c...@kernel.dk/

but apparently nobody is listening.

--
Jens Axboe

[Aleksandr Nogikh]

I've updated configs[1] so that syzbot won't send any floppy driver
reports to LKML (they'll only be displayed on the web dashboard with a
special tag).

If the driver gets rewritten or there's again interest in floppy
reports, please let us know.

[1] https://github.com/google/syzkaller/pull/4273

[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.