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Subject[syzbot] general protection fault in reset_interrupt
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Hello,

syzbot found the following issue on:

HEAD commit: c5c17547b778 Merge tag 'net-5.16-rc3' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16d12e9ab00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf85c53718a1e697
dashboard link: https://syzkaller.appspot.com/bug?extid=b1f15b24307fd6df6021
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+b1f15b24307fd6df6021@syzkaller.appspotmail.com

floppy1: disk absent or changed during operation
floppy1: disk absent or changed during operation
floppy1: disk absent or changed during operation
floppy1: disk absent or changed during operation
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 9 Comm: kworker/u16:0 Not tainted 5.16.0-rc2-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: floppy floppy_work_workfn
RIP: 0010:reset_interrupt+0xef/0x140 drivers/block/floppy.c:1793
Code: fc 84 db 0f 85 ab 5e 9b 04 e8 5d 4f fc fc 48 8b 1d 76 4b 00 0c 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 40 48 8b 43 08 5b ff e0 e8 6f 85 42 fd eb a8 e8 68
RSP: 0018:ffffc900005cfd10 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff847a8383 RDI: 0000000000000008
RBP: ffffffff8c6a4240 R08: 0000000000000080 R09: 0000000000000000
R10: ffffffff847a8376 R11: 0000000000000000 R12: ffffc900005cfdb0
R13: ffffffff8c6a4250 R14: ffff888011850600 R15: ffff888010c75800
FS: 0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa679dac058 CR3: 00000000194aa000 CR4: 0000000000150ef0
DR0: 0000000000002000 DR1: 0000000000000000 DR2: 0000000000000001
DR3: 0000000000006000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Modules linked in:
---[ end trace f0abc9321f84d854 ]---
RIP: 0010:reset_interrupt+0xef/0x140 drivers/block/floppy.c:1793
Code: fc 84 db 0f 85 ab 5e 9b 04 e8 5d 4f fc fc 48 8b 1d 76 4b 00 0c 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 40 48 8b 43 08 5b ff e0 e8 6f 85 42 fd eb a8 e8 68
RSP: 0018:ffffc900005cfd10 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff847a8383 RDI: 0000000000000008
RBP: ffffffff8c6a4240 R08: 0000000000000080 R09: 0000000000000000
R10: ffffffff847a8376 R11: 0000000000000000 R12: ffffc900005cfdb0
R13: ffffffff8c6a4250 R14: ffff888011850600 R15: ffff888010c75800
FS: 0000000000000000(0000) GS:ffff88802cb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2645abc6b8 CR3: 00000000194aa000 CR4: 0000000000150ee0
DR0: 0000000000002000 DR1: 0000000000000000 DR2: 0000000000000001
DR3: 0000000000006000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: fc cld
1: 84 db test %bl,%bl
3: 0f 85 ab 5e 9b 04 jne 0x49b5eb4
9: e8 5d 4f fc fc callq 0xfcfc4f6b
e: 48 8b 1d 76 4b 00 0c mov 0xc004b76(%rip),%rbx # 0xc004b8b
15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1c: fc ff df
1f: 48 8d 7b 08 lea 0x8(%rbx),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 75 40 jne 0x70
30: 48 8b 43 08 mov 0x8(%rbx),%rax
34: 5b pop %rbx
35: ff e0 jmpq *%rax
37: e8 6f 85 42 fd callq 0xfd4285ab
3c: eb a8 jmp 0xffffffe6
3e: e8 .byte 0xe8
3f: 68 .byte 0x68


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

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