Oops: divide error: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.16.0-rc5-next-20250708-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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: ffff888030a20880
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88806b192000
RBP: 0000000000000002 R08: 0000000000000000 R09: 00000000000000ff
R10: dffffc0000000000 R11: ffffffff88e91b20 R12: dffffc0000000000
R13: ffff888030a20838 R14: 0000000000000000 R15: ffff888030a20800
FS: 0000000000000000(0000) GS:ffff888125bd7000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faab2ff5f98 CR3: 0000000033708000 CR4: 00000000003526f0
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+0x289/0x980 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+0x267/0x9c0 kernel/irq/chip.c:797
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:266 [inline]
__common_interrupt+0x140/0x250 arch/x86/kernel/irq.c:292
common_interrupt+0xb6/0xe0 arch/x86/kernel/irq.c:285
</IRQ>
<TASK>
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d c3 ec 0f 00 f3 0f 1e fa fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff8de07d80 EFLAGS: 000002c6
RAX: 709f8e7c1b77cc00 RBX: ffffffff8196cd28 RCX: 709f8e7c1b77cc00
RDX: 0000000000000001 RSI: ffffffff8d9aefc8 RDI: ffffffff8be33740
RBP: ffffffff8de07ea8 R08: ffff8880b8632f5b R09: 1ffff110170c65eb
R10: dffffc0000000000 R11: ffffed10170c65ec R12: ffffffff8fa35430
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1bd2a50
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:757
default_idle_call+0x74/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:190 [inline]
do_idle+0x1e8/0x510 kernel/sched/idle.c:330
cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:428
rest_init+0x2de/0x300 init/main.c:744
start_kernel+0x47d/0x500 init/main.c:1097
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:307
x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:288
common_startup_64+0x13e/0x147
</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: ffff888030a20880
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88806b192000
RBP: 0000000000000002 R08: 0000000000000000 R09: 00000000000000ff
R10: dffffc0000000000 R11: ffffffff88e91b20 R12: dffffc0000000000
R13: ffff888030a20838 R14: 0000000000000000 R15: ffff888030a20800
FS: 0000000000000000(0000) GS:ffff888125bd7000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faab2ff5f98 CR3: 0000000033708000 CR4: 00000000003526f0
----------------
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