Oops: divide error: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 9772 Comm: syz.3.1519 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:comedi_inc_scan_progress+0x1a4/0x430 drivers/comedi/drivers.c:563
Code: b6 0c 19 84 c9 0f 85 bd 01 00 00 03 45 2c 4c 8d a5 80 00 00 00 4c 89 e1 48 c1 e9 03 0f b6 0c 19 84 c9 0f 85 cc 01 00 00 31 d2 <41> f7 34 24 41 89 17 45 89 ec eb 0f e8 4b 16 f6 f8 48 bb 00 00 00
RSP: 0018:ffffc90000007c78 EFLAGS: 00010046
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88802f570e00 R08: 00000000000000ff R09: 00000000000000ff
R10: dffffc0000000000 R11: ffffed100526dc01 R12: ffff88802f570e80
R13: 0000000000000002 R14: 0000000000000000 R15: ffff88802f570e2c
FS: 00007f88279ae6c0(0000) GS:ffff888125a78000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c34a0cc CR3: 000000002a244000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
comedi_buf_write_samples+0x373/0x5a0 drivers/comedi/comedi_buf.c:603
das16m1_handler+0x213/0x4b0 drivers/comedi/drivers/das16m1.c:413
das16m1_interrupt+0xaf/0x180 drivers/comedi/drivers/das16m1.c:470
__handle_irq_event_percpu+0x285/0xae0 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:172 [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
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+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 3b 24 63 f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 f3 b4 2a f6 65 8b 05 bc ff 53 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc90003357be0 EFLAGS: 00000206
RAX: 78b5a75bcb7c8b00 RBX: 0000000000000a02 RCX: 78b5a75bcb7c8b00
RDX: 0000000000000006 RSI: ffffffff8da8b2a1 RDI: 0000000000000001
RBP: ffffc90003357c70 R08: ffffffff8fbf6d77 R09: 1ffffffff1f7edae
R10: dffffc0000000000 R11: fffffbfff1f7edaf R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff99fb0f20 R15: 1ffff9200066af7c
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
uart_port_unlock_irqrestore include/linux/serial_core.h:788 [inline]
uart_port_unlock_deref+0x111/0x2f0 drivers/tty/serial/serial_core.c:91
uart_write+0xe8/0x130 drivers/tty/serial/serial_core.c:634
tnc_init drivers/net/hamradio/6pack.c:490 [inline]
sixpack_open+0x671/0x920 drivers/net/hamradio/6pack.c:580
tty_ldisc_open+0xa1/0x100 drivers/tty/tty_ldisc.c:432
tty_set_ldisc+0x373/0x560 drivers/tty/tty_ldisc.c:563
tty_ioctl+0xc38/0xde0 drivers/tty/tty_io.c:2728
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8826b8f6c9
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:00007f88279ae038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8826de5fa0 RCX: 00007f8826b8f6c9
RDX: 00002000000000c0 RSI: 0000000000005423 RDI: 0000000000000003
RBP: 00007f8826c11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8826de6038 R14: 00007f8826de5fa0 R15: 00007fff438218f8
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:comedi_inc_scan_progress+0x1a4/0x430 drivers/comedi/drivers.c:563
Code: b6 0c 19 84 c9 0f 85 bd 01 00 00 03 45 2c 4c 8d a5 80 00 00 00 4c 89 e1 48 c1 e9 03 0f b6 0c 19 84 c9 0f 85 cc 01 00 00 31 d2 <41> f7 34 24 41 89 17 45 89 ec eb 0f e8 4b 16 f6 f8 48 bb 00 00 00
RSP: 0018:ffffc90000007c78 EFLAGS: 00010046
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88802f570e00 R08: 00000000000000ff R09: 00000000000000ff
R10: dffffc0000000000 R11: ffffed100526dc01 R12: ffff88802f570e80
R13: 0000000000000002 R14: 0000000000000000 R15: ffff88802f570e2c
FS: 00007f88279ae6c0(0000) GS:ffff888125a78000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c34a0cc CR3: 000000002a244000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: b6 0c mov $0xc,%dh
2: 19 84 c9 0f 85 bd 01 sbb %eax,0x1bd850f(%rcx,%rcx,8)
9: 00 00 add %al,(%rax)
b: 03 45 2c add 0x2c(%rbp),%eax
e: 4c 8d a5 80 00 00 00 lea 0x80(%rbp),%r12
15: 4c 89 e1 mov %r12,%rcx
18: 48 c1 e9 03 shr $0x3,%rcx
1c: 0f b6 0c 19 movzbl (%rcx,%rbx,1),%ecx
20: 84 c9 test %cl,%cl
22: 0f 85 cc 01 00 00 jne 0x1f4
28: 31 d2 xor %edx,%edx
* 2a: 41 f7 34 24 divl (%r12) <-- trapping instruction
2e: 41 89 17 mov %edx,(%r15)
31: 45 89 ec mov %r13d,%r12d
34: eb 0f jmp 0x45
36: e8 4b 16 f6 f8 call 0xf8f61686
3b: 48 rex.W
3c: bb .byte 0xbb
3d: 00 00 add %al,(%rax)