syzbot

Oops: divide error: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 23999 Comm: syz.2.4602 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:comedi_inc_scan_progress+0x1cc/0x340 drivers/comedi/drivers.c:563
Code: 00 00 00 03 43 2c 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 0f b6 14 11 84 d2 74 09 80 fa 03 0f 8e 53 01 00 00 31 d2 <f7> b3 80 00 00 00 89 53 2c e8 06 76 fa f8 48 8d 7b 34 48 b8 00 00
RSP: 0018:ffffc90000007d90 EFLAGS: 00010046
RAX: 0000000000000001 RBX: ffff88805d28c600 RCX: 1ffff1100ba518d0
RDX: 0000000000000000 RSI: ffffffff88c29728 RDI: ffff88805d28c680
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  00007f00d4a376c0(0000) GS:ffff888124a08000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000002a291000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 comedi_buf_write_samples+0x406/0x640 drivers/comedi/comedi_buf.c:603
 parport_interrupt+0xec/0x150 drivers/comedi/drivers/comedi_parport.c:218
 __handle_irq_event_percpu+0x236/0x920 kernel/irq/handle.c:203
 handle_irq_event_percpu kernel/irq/handle.c:240 [inline]
 handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:257
 handle_edge_irq+0x3ca/0x9e0 kernel/irq/chip.c:855
 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
 handle_irq arch/x86/kernel/irq.c:254 [inline]
 call_irq_handler arch/x86/kernel/irq.c:310 [inline]
 __common_interrupt+0xd0/0x2f0 arch/x86/kernel/irq.c:325
 common_interrupt+0xba/0xe0 arch/x86/kernel/irq.c:318
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 36 ba 35 f6 48 89 df e8 1e 0e 36 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 45 16 26 f6 65 8b 05 7e 55 3e 08 85 c0 74 16 5b
RSP: 0018:ffffc9000c0c7a58 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff9add9280 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff8da2b0a2 RDI: ffffffff8bf07040
RBP: 0000000000000283 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff908203d7 R11: 0000000000000001 R12: ffffffff8f05d420
R13: 0000000000000003 R14: 0000000000000000 R15: 1ffff92001818f5b
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 uart_port_unlock_irqrestore include/linux/serial_core.h:788 [inline]
 autoconfig drivers/tty/serial/8250/8250_port.c:1199 [inline]
 serial8250_config_port+0x1742/0x5040 drivers/tty/serial/8250/8250_port.c:3083
 univ8250_config_port+0x279/0x3b0 drivers/tty/serial/8250/8250_rsa.c:70
 uart_do_autoconfig drivers/tty/serial/serial_core.c:1174 [inline]
 uart_ioctl+0xfd5/0x3080 drivers/tty/serial/serial_core.c:1570
 tty_ioctl+0x661/0x1680 drivers/tty/tty_io.c:2792
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f00d3b8efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f00d4a37038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f00d3de5fa0 RCX: 00007f00d3b8efc9
RDX: 0000000000000000 RSI: 0000000000005453 RDI: 000000000000000a
RBP: 00007f00d3c11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f00d3de6038 R14: 00007f00d3de5fa0 R15: 00007ffec13eb888
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:comedi_inc_scan_progress+0x1cc/0x340 drivers/comedi/drivers.c:563
Code: 00 00 00 03 43 2c 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 0f b6 14 11 84 d2 74 09 80 fa 03 0f 8e 53 01 00 00 31 d2 <f7> b3 80 00 00 00 89 53 2c e8 06 76 fa f8 48 8d 7b 34 48 b8 00 00
RSP: 0018:ffffc90000007d90 EFLAGS: 00010046
RAX: 0000000000000001 RBX: ffff88805d28c600 RCX: 1ffff1100ba518d0
RDX: 0000000000000000 RSI: ffffffff88c29728 RDI: ffff88805d28c680
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  00007f00d4a376c0(0000) GS:ffff888124a08000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000002a291000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	00 00                	add    %al,(%rax)
   2:	03 43 2c             	add    0x2c(%rbx),%eax
   5:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
   c:	fc ff df
   f:	48 89 f9             	mov    %rdi,%rcx
  12:	48 c1 e9 03          	shr    $0x3,%rcx
  16:	0f b6 14 11          	movzbl (%rcx,%rdx,1),%edx
  1a:	84 d2                	test   %dl,%dl
  1c:	74 09                	je     0x27
  1e:	80 fa 03             	cmp    $0x3,%dl
  21:	0f 8e 53 01 00 00    	jle    0x17a
  27:	31 d2                	xor    %edx,%edx
* 29:	f7 b3 80 00 00 00    	divl   0x80(%rbx) <-- trapping instruction
  2f:	89 53 2c             	mov    %edx,0x2c(%rbx)
  32:	e8 06 76 fa f8       	call   0xf8fa763d
  37:	48 8d 7b 34          	lea    0x34(%rbx),%rdi
  3b:	48                   	rex.W
  3c:	b8                   	.byte 0xb8