Oops: divide error: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 1296 Comm: aoe_tx0 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: ffffc90003f51000 RCX: ffffffff88cc359f
RDX: 0000000000000000 RSI: ffffffff88c9ddc0 RDI: 0000000000000004
RBP: dffffc0000000000 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000001 R11: ffff88801e6a263c R12: ffff88801e6a2600
R13: 0000000000000002 R14: 0000000000000000 R15: ffffffff88cc34e0
FS:  0000000000000000(0000) GS:ffff8881249d8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560655e2c168 CR3: 000000000e182000 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+0xd0/0x2f0 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:688
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 a6 c7 2f f6 48 89 df e8 8e 1b 30 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 45 26 20 f6 65 8b 05 7e 25 3b 08 85 c0 74 16 5b
RSP: 0018:ffffc9000489f808 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff9ae09360 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8db032f7 RDI: ffffffff8bf1dec0
RBP: 0000000000000293 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff908313d7 R11: 0000000000000001 R12: 0000000000000022
R13: ffffffff9ae09468 R14: 0000000000000000 R15: 0000000000000003
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 uart_port_unlock_irqrestore include/linux/serial_core.h:788 [inline]
 uart_port_unlock_deref drivers/tty/serial/serial_core.c:91 [inline]
 uart_port_unlock_deref drivers/tty/serial/serial_core.c:88 [inline]
 uart_write+0x2a4/0xb30 drivers/tty/serial/serial_core.c:634
 sl_encaps drivers/net/slip/slip.c:409 [inline]
 sl_xmit+0x6d1/0xf30 drivers/net/slip/slip.c:518
 __netdev_start_xmit include/linux/netdevice.h:5248 [inline]
 netdev_start_xmit include/linux/netdevice.h:5257 [inline]
 xmit_one net/core/dev.c:3845 [inline]
 dev_hard_start_xmit+0x97/0x740 net/core/dev.c:3861
 sch_direct_xmit+0x1b2/0xcf0 net/sched/sch_generic.c:344
 __dev_xmit_skb net/core/dev.c:4152 [inline]
 __dev_queue_xmit+0x144d/0x4490 net/core/dev.c:4729
 dev_queue_xmit include/linux/netdevice.h:3365 [inline]
 tx+0xcc/0x190 drivers/block/aoe/aoenet.c:62
 kthread+0x1e4/0x3e0 drivers/block/aoe/aoecmd.c:1241
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </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: ffffc90003f51000 RCX: ffffffff88cc359f
RDX: 0000000000000000 RSI: ffffffff88c9ddc0 RDI: 0000000000000004
RBP: dffffc0000000000 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000001 R11: ffff88801e6a263c R12: ffff88801e6a2600
R13: 0000000000000002 R14: 0000000000000000 R15: ffffffff88cc34e0
FS:  0000000000000000(0000) GS:ffff8881249d8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560655e2c168 CR3: 000000000e182000 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)