Oops: divide error: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 5986 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:comedi_buf_munge drivers/comedi/comedi_buf.c:347 [inline]
RIP: 0010:comedi_buf_write_free+0x3c8/0x7e0 drivers/comedi/comedi_buf.c:391
Code: 41 03 45 00 48 8b 4c 24 78 42 0f b6 0c 21 84 c9 4c 8b bc 24 90 00 00 00 44 8b 74 24 54 0f 85 02 01 00 00 31 d2 48 8b 4c 24 30 <f7> 31 41 89 55 00 48 8b 44 24 70 42 0f b6 04 20 84 c0 0f 85 09 01
RSP: 0018:ffffc90000007bd8 EFLAGS: 00010046
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: ffff88807d2d5080
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88806518e000
RBP: 0000000000000002 R08: 0000000000000000 R09: 00000000000000ff
R10: dffffc0000000000 R11: ffffffff8900ce90 R12: dffffc0000000000
R13: ffff88807d2d5038 R14: 0000000000000000 R15: ffff88807d2d5000
FS:  00007f738b044880(0000) GS:ffff8881257a8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005590bcc76000 CR3: 0000000077490000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 0000000000000006 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 comedi_buf_write_samples+0x369/0x5a0 drivers/comedi/comedi_buf.c:602
 das16m1_handler+0x213/0x4b0 drivers/comedi/drivers/das16m1.c:413
 das16m1_interrupt+0xaf/0x180 drivers/comedi/drivers/das16m1.c:470
 __handle_irq_event_percpu+0x295/0xab0 kernel/irq/handle.c:203
 handle_irq_event_percpu kernel/irq/handle.c:240 [inline]
 handle_irq_event+0x8b/0x1e0 kernel/irq/handle.c:257
 handle_edge_irq+0x23b/0xa10 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:-1 [inline]
 __common_interrupt+0x141/0x1f0 arch/x86/kernel/irq.c:325
 common_interrupt+0xb6/0xe0 arch/x86/kernel/irq.c:318
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
RIP: 0010:syscall_enter_from_user_mode_work include/linux/entry-common.h:94 [inline]
RIP: 0010:syscall_enter_from_user_mode include/linux/entry-common.h:125 [inline]
RIP: 0010:do_syscall_64+0xc3/0xfa0 arch/x86/entry/syscall_64.c:90
Code: 00 48 8b 7d 08 48 89 7b 18 e8 b9 72 00 00 0f 1f 44 00 00 0f 1f 44 00 00 90 e8 89 48 3f f6 90 90 e8 32 48 3f f6 fb 49 8b 57 08 <f6> c2 3f 74 0e 4c 89 f7 4c 89 ee e8 8d 18 22 f6 49 89 c4 90 90 41
RSP: 0018:ffffc90004e1fee0 EFLAGS: 00000282
RAX: 67c581564dae7f00 RBX: ffffc90004e1fee0 RCX: 67c581564dae7f00
RDX: 0000000000000000 RSI: ffffffff8dc97dd0 RDI: ffffffff8c05d060
RBP: ffffc90004e1ff38 R08: ffffffff8fe57b77 R09: 1ffffffff1fcaf6e
R10: dffffc0000000000 R11: fffffbfff1fcaf6f R12: 00000000000000e8
R13: 00000000000000e8 R14: ffffc90004e1ff48 R15: ffff88802eb1bc80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f738a8a7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffc274c45d0 EFLAGS: 00000202 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 00007f738b044880 RCX: 00007f738a8a7407
RDX: 0000000000000004 RSI: 00007ffc274c4660 RDI: 0000000000000004
RBP: 000055e40c9ca910 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000202 R12: 000055e40c9deba0
R13: 00007ffc274c4660 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:comedi_buf_munge drivers/comedi/comedi_buf.c:347 [inline]
RIP: 0010:comedi_buf_write_free+0x3c8/0x7e0 drivers/comedi/comedi_buf.c:391
Code: 41 03 45 00 48 8b 4c 24 78 42 0f b6 0c 21 84 c9 4c 8b bc 24 90 00 00 00 44 8b 74 24 54 0f 85 02 01 00 00 31 d2 48 8b 4c 24 30 <f7> 31 41 89 55 00 48 8b 44 24 70 42 0f b6 04 20 84 c0 0f 85 09 01
RSP: 0018:ffffc90000007bd8 EFLAGS: 00010046
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: ffff88807d2d5080
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88806518e000
RBP: 0000000000000002 R08: 0000000000000000 R09: 00000000000000ff
R10: dffffc0000000000 R11: ffffffff8900ce90 R12: dffffc0000000000
R13: ffff88807d2d5038 R14: 0000000000000000 R15: ffff88807d2d5000
FS:  00007f738b044880(0000) GS:ffff8881257a8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005590bcc76000 CR3: 0000000077490000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 0000000000000006 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	41 03 45 00          	add    0x0(%r13),%eax
   4:	48 8b 4c 24 78       	mov    0x78(%rsp),%rcx
   9:	42 0f b6 0c 21       	movzbl (%rcx,%r12,1),%ecx
   e:	84 c9                	test   %cl,%cl
  10:	4c 8b bc 24 90 00 00 	mov    0x90(%rsp),%r15
  17:	00
  18:	44 8b 74 24 54       	mov    0x54(%rsp),%r14d
  1d:	0f 85 02 01 00 00    	jne    0x125
  23:	31 d2                	xor    %edx,%edx
  25:	48 8b 4c 24 30       	mov    0x30(%rsp),%rcx
* 2a:	f7 31                	divl   (%rcx) <-- trapping instruction
  2c:	41 89 55 00          	mov    %edx,0x0(%r13)
  30:	48 8b 44 24 70       	mov    0x70(%rsp),%rax
  35:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax
  3a:	84 c0                	test   %al,%al
  3c:	0f                   	.byte 0xf
  3d:	85 09                	test   %ecx,(%rcx)
  3f:	01                   	.byte 0x1