divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 18713 Comm: syz.8.4649 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:comedi_inc_scan_progress+0x1a5/0x420 drivers/comedi/drivers.c:563
Code: 0c 29 84 c9 0f 85 ad 01 00 00 03 43 34 4c 8d a3 88 00 00 00 4c 89 e1 48 c1 e9 03 42 0f b6 0c 29 84 c9 0f 85 b3 01 00 00 31 d2 <41> f7 34 24 41 89 17 eb 05 e8 7d 61 f1 f9 4c 8d 63 3c 4d 89 e7 49
RSP: 0018:ffffc90000007c90 EFLAGS: 00010046
RAX: 0000000000000001 RBX: ffff888024048c00 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffffc900038aa001 R09: 1ffff92000715400
R10: dffffc0000000000 R11: fffff52000715401 R12: ffff888024048c88
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888024048c34
FS:  00007fb4d26976c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30721ff8 CR3: 0000000066d08000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 comedi_buf_write_samples+0x37b/0x5f0 drivers/comedi/comedi_buf.c:647
 das16m1_handler+0x239/0x4d0 drivers/comedi/drivers/das16m1.c:414
 das16m1_interrupt+0xa7/0x170 drivers/comedi/drivers/das16m1.c:471
 __handle_irq_event_percpu+0x299/0x9d0 kernel/irq/handle.c:156
 handle_irq_event_percpu kernel/irq/handle.c:196 [inline]
 handle_irq_event+0xa5/0x220 kernel/irq/handle.c:213
 handle_edge_irq+0x242/0xb20 kernel/irq/chip.c:819
 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
 handle_irq arch/x86/kernel/irq.c:233 [inline]
 __common_interrupt+0xd7/0x1e0 arch/x86/kernel/irq.c:252
 common_interrupt+0xb0/0xd0 arch/x86/kernel/irq.c:242
 </IRQ>
 <TASK>
 asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:667
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 5f ce 86 f7 65 8b 05 e0 e4 36 76 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc9000372fbc0 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a06 RCX: 779fcd0a6caae100
RDX: dffffc0000000000 RSI: ffffffff8a2b2b60 RDI: 0000000000000001
RBP: ffffc9000372fc50 R08: ffffffff91015117 R09: 1ffffffff2202a22
R10: dffffc0000000000 R11: fffffbfff2202a23 R12: dffffc0000000000
R13: ffffffff97443128 R14: ffffffff97443128 R15: 1ffff920006e5f78
 spin_unlock_irqrestore include/linux/spinlock.h:419 [inline]
 autoconfig drivers/tty/serial/8250/8250_port.c:1336 [inline]
 serial8250_config_port+0x19e2/0x3640 drivers/tty/serial/8250/8250_port.c:3208
 univ8250_config_port+0x393/0x940 drivers/tty/serial/8250/8250_core.c:446
 uart_do_autoconfig drivers/tty/serial/serial_core.c:1164 [inline]
 uart_ioctl+0x689/0x800 drivers/tty/serial/serial_core.c:1428
 tty_ioctl+0x848/0xc30 drivers/tty/tty_io.c:2810
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb4d443f559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb4d2697028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb4d46c6fa0 RCX: 00007fb4d443f559
RDX: 0000000000000000 RSI: 0000000000005453 RDI: 0000000000000003
RBP: 00007fb4d44d6ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb4d46c7038 R14: 00007fb4d46c6fa0 R15: 00007fff2f43be28
 </TASK>
Modules linked in:
---[ end trace d44d34a3f50bb7c4 ]---
RIP: 0010:comedi_inc_scan_progress+0x1a5/0x420 drivers/comedi/drivers.c:563
Code: 0c 29 84 c9 0f 85 ad 01 00 00 03 43 34 4c 8d a3 88 00 00 00 4c 89 e1 48 c1 e9 03 42 0f b6 0c 29 84 c9 0f 85 b3 01 00 00 31 d2 <41> f7 34 24 41 89 17 eb 05 e8 7d 61 f1 f9 4c 8d 63 3c 4d 89 e7 49
RSP: 0018:ffffc90000007c90 EFLAGS: 00010046
RAX: 0000000000000001 RBX: ffff888024048c00 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffffc900038aa001 R09: 1ffff92000715400
R10: dffffc0000000000 R11: fffff52000715401 R12: ffff888024048c88
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888024048c34
FS:  00007fb4d26976c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30721ff8 CR3: 0000000066d08000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	0c 29                	or     $0x29,%al
   2:	84 c9                	test   %cl,%cl
   4:	0f 85 ad 01 00 00    	jne    0x1b7
   a:	03 43 34             	add    0x34(%rbx),%eax
   d:	4c 8d a3 88 00 00 00 	lea    0x88(%rbx),%r12
  14:	4c 89 e1             	mov    %r12,%rcx
  17:	48 c1 e9 03          	shr    $0x3,%rcx
  1b:	42 0f b6 0c 29       	movzbl (%rcx,%r13,1),%ecx
  20:	84 c9                	test   %cl,%cl
  22:	0f 85 b3 01 00 00    	jne    0x1db
  28:	31 d2                	xor    %edx,%edx
* 2a:	41 f7 34 24          	divl   (%r12) <-- trapping instruction
  2e:	41 89 17             	mov    %edx,(%r15)
  31:	eb 05                	jmp    0x38
  33:	e8 7d 61 f1 f9       	call   0xf9f161b5
  38:	4c 8d 63 3c          	lea    0x3c(%rbx),%r12
  3c:	4d 89 e7             	mov    %r12,%r15
  3f:	49                   	rex.WB