Oops: divide error: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 11477 Comm: syz.4.1526 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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: 0000:ffffc90003f57b18 EFLAGS: 00010046
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: ffff8880319ffe80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88802d0ab000
RBP: 0000000000000002 R08: 0000000000000000 R09: 00000000000000ff
R10: dffffc0000000000 R11: ffffffff88bcf930 R12: dffffc0000000000
R13: ffff8880319ffe38 R14: 0000000000000000 R15: ffff8880319ffe00
FS:  00005555569db500(0000) GS:ffff888125d2b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f80bc65f350 CR3: 00000000790f6000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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+0x5e/0xe0 arch/x86/kernel/irq.c:318
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
RIP: 0033:0x7f80bc78ef03
Code: f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 89 ca 41 f7 c1 ff 0f 00 00 75 14 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 25 c3 0f 1f 40 00 48 c7 c0 a8 ff ff ff 64 c7
RSP: 002b:00007ffddfcf0ea8 EFLAGS: 00000246
RAX: 0000001b2cc64000 RBX: 0000001b2cc64000 RCX: 00007f80bc78ef03
RDX: 0000000000000003 RSI: 00000000003c0000 RDI: 0000001b2cc64000
RBP: 0000000000400000 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000246 R12: 00000000000000af
R13: 00000000000927c0 R14: 000000000006caec R15: 00007ffddfcf1190
 </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: 0000:ffffc90003f57b18 EFLAGS: 00010046
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: ffff8880319ffe80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88802d0ab000
RBP: 0000000000000002 R08: 0000000000000000 R09: 00000000000000ff
R10: dffffc0000000000 R11: ffffffff88bcf930 R12: dffffc0000000000
R13: ffff8880319ffe38 R14: 0000000000000000 R15: ffff8880319ffe00
FS:  00005555569db500(0000) GS:ffff888125d2b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f80bc65f350 CR3: 00000000790f6000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 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