Oops: divide error: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 13505 Comm: syz.4.1895 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+0x414/0x720 drivers/comedi/comedi_buf.c:391
Code: 02 00 00 31 d2 f7 74 24 1c 48 8b 54 24 30 48 c1 ea 03 0f b6 14 2a 41 03 44 24 38 84 d2 74 09 80 fa 03 0f 8e 66 02 00 00 31 d2 <41> f7 b4 24 80 00 00 00 48 8b 44 24 48 48 c1 e8 03 41 89 54 24 38
RSP: 0018:ffffc90000007d20 EFLAGS: 00010046
RAX: 0000000000000001 RBX: ffffc9000447a000 RCX: ffffffff88caef8f
RDX: 0000000000000000 RSI: ffffffff88c897ad RDI: 0000000000000004
RBP: dffffc0000000000 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000001 R11: ffff88802a17203c R12: ffff88802a172000
R13: 0000000000000002 R14: 0000000000000000 R15: ffffffff88caeed0
FS:  00007ff0e73ef6c0(0000) GS:ffff8881249dc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000089030 CR3: 0000000079059000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 comedi_buf_write_samples+0x3fc/0x640 drivers/comedi/comedi_buf.c:602
 das16m1_handler+0x203/0x5a0 drivers/comedi/drivers/das16m1.c:413
 das16m1_interrupt+0xb7/0x1c0 drivers/comedi/drivers/das16m1.c:470
 __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+0xcd/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:693
RIP: 0010:write_comp_data+0x8b/0x90 kernel/kcov.c:272
Code: 00 00 4a 8d 34 dd 28 00 00 00 48 39 f2 72 1b 48 83 c7 01 48 89 38 4c 89 44 30 e0 4c 89 4c 30 e8 4c 89 54 30 f0 4a 89 4c d8 20 <c3> cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3
RSP: 0018:ffffc9000445fa20 EFLAGS: 00000297
RAX: 0000000000000002 RBX: ffffffff8bf12400 RCX: ffffffff820852f2
RDX: ffff888022b2a480 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00000000000000a2 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffc9000445fa98 R14: ffffc9000445fb80 R15: ffffc9000445fa98
 __might_fault+0x62/0x190 mm/memory.c:7077
 _inline_copy_from_user include/linux/uaccess.h:162 [inline]
 _copy_from_user+0x29/0xd0 lib/usercopy.c:18
 copy_from_user include/linux/uaccess.h:212 [inline]
 copy_msghdr_from_user+0x98/0x160 net/socket.c:2560
 recvmsg_copy_msghdr net/socket.c:2816 [inline]
 ___sys_recvmsg+0xdb/0x1a0 net/socket.c:2888
 do_recvmmsg+0x2fe/0x750 net/socket.c:2987
 __sys_recvmmsg net/socket.c:3061 [inline]
 __do_sys_recvmmsg net/socket.c:3084 [inline]
 __se_sys_recvmmsg net/socket.c:3077 [inline]
 __x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3077
 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: 0033:0x7ff0e658eec9
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:00007ff0e73ef038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007ff0e67e6090 RCX: 00007ff0e658eec9
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000004
RBP: 00007ff0e6611f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff0e67e6128 R14: 00007ff0e67e6090 R15: 00007ffee770e058
 </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+0x414/0x720 drivers/comedi/comedi_buf.c:391
Code: 02 00 00 31 d2 f7 74 24 1c 48 8b 54 24 30 48 c1 ea 03 0f b6 14 2a 41 03 44 24 38 84 d2 74 09 80 fa 03 0f 8e 66 02 00 00 31 d2 <41> f7 b4 24 80 00 00 00 48 8b 44 24 48 48 c1 e8 03 41 89 54 24 38
RSP: 0018:ffffc90000007d20 EFLAGS: 00010046
RAX: 0000000000000001 RBX: ffffc9000447a000 RCX: ffffffff88caef8f
RDX: 0000000000000000 RSI: ffffffff88c897ad RDI: 0000000000000004
RBP: dffffc0000000000 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000001 R11: ffff88802a17203c R12: ffff88802a172000
R13: 0000000000000002 R14: 0000000000000000 R15: ffffffff88caeed0
FS:  00007ff0e73ef6c0(0000) GS:ffff8881249dc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000089030 CR3: 0000000079059000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	02 00                	add    (%rax),%al
   2:	00 31                	add    %dh,(%rcx)
   4:	d2 f7                	shl    %cl,%bh
   6:	74 24                	je     0x2c
   8:	1c 48                	sbb    $0x48,%al
   a:	8b 54 24 30          	mov    0x30(%rsp),%edx
   e:	48 c1 ea 03          	shr    $0x3,%rdx
  12:	0f b6 14 2a          	movzbl (%rdx,%rbp,1),%edx
  16:	41 03 44 24 38       	add    0x38(%r12),%eax
  1b:	84 d2                	test   %dl,%dl
  1d:	74 09                	je     0x28
  1f:	80 fa 03             	cmp    $0x3,%dl
  22:	0f 8e 66 02 00 00    	jle    0x28e
  28:	31 d2                	xor    %edx,%edx
* 2a:	41 f7 b4 24 80 00 00 	divl   0x80(%r12) <-- trapping instruction
  31:	00
  32:	48 8b 44 24 48       	mov    0x48(%rsp),%rax
  37:	48 c1 e8 03          	shr    $0x3,%rax
  3b:	41 89 54 24 38       	mov    %edx,0x38(%r12)