divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 14307 Comm: syz.4.2933 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:comedi_inc_scan_progress+0x1a2/0x430 drivers/comedi/drivers.c:562
Code: b6 0c 19 84 c9 0f 85 b8 01 00 00 03 45 34 4c 8d a5 88 00 00 00 4c 89 e1 48 c1 e9 03 0f b6 0c 19 84 c9 0f 85 c7 01 00 00 31 d2 <41> f7 34 24 41 89 17 45 89 ec eb 0f e8 ed 09 77 f9 48 bb 00 00 00
RSP: 0018:ffffc90000007c80 EFLAGS: 00010046
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888077a2dc00 R08: ffff888077a2dc00 R09: 00000000000000ff
R10: dffffc0000000000 R11: fffff52001835201 R12: ffff888077a2dc88
R13: 0000000000000002 R14: 0000000000000000 R15: ffff888077a2dc34
FS:  00007f02be11b6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2eedab CR3: 0000000068670000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 comedi_buf_write_samples+0x372/0x5d0 drivers/comedi/comedi_buf.c:646
 das16m1_handler+0x213/0x4b0 drivers/comedi/drivers/das16m1.c:413
 das16m1_interrupt+0xab/0x180 drivers/comedi/drivers/das16m1.c:470
 __handle_irq_event_percpu+0x271/0x940 kernel/irq/handle.c:158
 handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
 handle_irq_event+0x8b/0x1e0 kernel/irq/handle.c:210
 handle_edge_irq+0x247/0xb30 kernel/irq/chip.c:831
 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
 handle_irq arch/x86/kernel/irq.c:240 [inline]
 __common_interrupt+0x13b/0x230 arch/x86/kernel/irq.c:259
 common_interrupt+0xb4/0xd0 arch/x86/kernel/irq.c:249
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:678
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xc0/0x120 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> 1b 69 ce f6 65 8b 05 ec 9f 75 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc9000d2afa40 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a06 RCX: 9d0d6530effb3100
RDX: dffffc0000000000 RSI: ffffffff8acac900 RDI: 0000000000000001
RBP: ffffc9000d2afad0 R08: ffffffff911bf557 R09: 1ffffffff2237eaa
R10: dffffc0000000000 R11: fffffbfff2237eab R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff975efd00 R15: 1ffff92001a55f48
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 autoconfig drivers/tty/serial/8250/8250_port.c:1307 [inline]
 serial8250_config_port+0x26be/0x3a00 drivers/tty/serial/8250/8250_port.c:3221
 univ8250_config_port+0x3b5/0x960 drivers/tty/serial/8250/8250_core.c:445
 uart_do_autoconfig drivers/tty/serial/serial_core.c:1204 [inline]
 uart_ioctl+0xe4d/0x1020 drivers/tty/serial/serial_core.c:1603
 tty_ioctl+0x926/0xdd0 drivers/tty/tty_io.c:2779
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f02bd19c629
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:00007f02be11b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f02bd415fa0 RCX: 00007f02bd19c629
RDX: 0000000000000000 RSI: 0000000000005453 RDI: 0000000000000003
RBP: 00007f02bd232b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f02bd416038 R14: 00007f02bd415fa0 R15: 00007fffd429b5a8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:comedi_inc_scan_progress+0x1a2/0x430 drivers/comedi/drivers.c:562
Code: b6 0c 19 84 c9 0f 85 b8 01 00 00 03 45 34 4c 8d a5 88 00 00 00 4c 89 e1 48 c1 e9 03 0f b6 0c 19 84 c9 0f 85 c7 01 00 00 31 d2 <41> f7 34 24 41 89 17 45 89 ec eb 0f e8 ed 09 77 f9 48 bb 00 00 00
RSP: 0018:ffffc90000007c80 EFLAGS: 00010046
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888077a2dc00 R08: ffff888077a2dc00 R09: 00000000000000ff
R10: dffffc0000000000 R11: fffff52001835201 R12: ffff888077a2dc88
R13: 0000000000000002 R14: 0000000000000000 R15: ffff888077a2dc34
FS:  00007f02be11b6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2eedab CR3: 0000000068670000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	b6 0c                	mov    $0xc,%dh
   2:	19 84 c9 0f 85 b8 01 	sbb    %eax,0x1b8850f(%rcx,%rcx,8)
   9:	00 00                	add    %al,(%rax)
   b:	03 45 34             	add    0x34(%rbp),%eax
   e:	4c 8d a5 88 00 00 00 	lea    0x88(%rbp),%r12
  15:	4c 89 e1             	mov    %r12,%rcx
  18:	48 c1 e9 03          	shr    $0x3,%rcx
  1c:	0f b6 0c 19          	movzbl (%rcx,%rbx,1),%ecx
  20:	84 c9                	test   %cl,%cl
  22:	0f 85 c7 01 00 00    	jne    0x1ef
  28:	31 d2                	xor    %edx,%edx
* 2a:	41 f7 34 24          	divl   (%r12) <-- trapping instruction
  2e:	41 89 17             	mov    %edx,(%r15)
  31:	45 89 ec             	mov    %r13d,%r12d
  34:	eb 0f                	jmp    0x45
  36:	e8 ed 09 77 f9       	call   0xf9770a28
  3b:	48                   	rex.W
  3c:	bb                   	.byte 0xbb
  3d:	00 00                	add    %al,(%rax)