Oops: divide error: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 22698 Comm: syz.2.5246 Not tainted 6.16.0-rc6-next-20250718-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:comedi_inc_scan_progress+0x1a4/0x430 drivers/comedi/drivers.c:556
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 9b 84 cf f8 48 bb 00 00 00
RSP: 0018:ffffc90000007a00 EFLAGS: 00010046
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888059f0a600 R08: dffffc0000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100d0ada01 R12: ffff888059f0a680
R13: 0000000000000002 R14: 0000000000000000 R15: ffff888059f0a62c
FS: 00007f050e7a76c0(0000) GS:ffff8881257ab000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3bff80 CR3: 000000007ef78000 CR4: 00000000003526f0
Call Trace:
comedi_buf_write_samples+0x373/0x5a0 drivers/comedi/comedi_buf.c:603
parport_interrupt+0xf3/0x150 drivers/comedi/drivers/comedi_parport.c:218
__handle_irq_event_percpu+0x28c/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+0x267/0x9e0 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+0x143/0x250 arch/x86/kernel/irq.c:292
common_interrupt+0x5e/0xe0 arch/x86/kernel/irq.c:285
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:variable_ffs arch/x86/include/asm/bitops.h:318 [inline]
RIP: 0010:handle_softirqs+0x1b0/0x870 kernel/softirq.c:567
Code: 89 64 24 30 0f b7 db 48 c7 c7 80 a7 a9 8b e8 67 65 fa 09 65 66 c7 05 d5 25 62 11 00 00 e8 c8 7a 42 00 fb 49 c7 c7 c0 c0 20 8e ff ff ff ff 0f bc c3 41 89 c5 41 ff c5 0f 84 c2 03 00 00 89 5c
RSP: 0018:ffffc90000007e40 EFLAGS: 00000286
RAX: caacc5b9cf8d9600 RBX: 0000000000000100 RCX: caacc5b9cf8d9600
RDX: 0000000000000002 RSI: ffffffff8dc6a0fe RDI: ffffffff8c04d400
RBP: ffffc90000007f50 R08: ffffffff8fe3cf37 R09: 1ffffffff1fc79e6
R10: dffffc0000000000 R11: fffffbfff1fc79e7 R12: 000000000000000a
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffffff8e20c0c0
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
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 7b 98 45 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 e3 46 0e f6 65 8b 05 4c 43 65 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc90003707c00 EFLAGS: 00000206
RAX: caacc5b9cf8d9600 RBX: 0000000000000a02 RCX: caacc5b9cf8d9600
RDX: 0000000000000006 RSI: ffffffff8dc6a0fe RDI: 0000000000000001
RBP: ffffc90003707c90 R08: ffffffff8fe3cf37 R09: 1ffffffff1fc79e6
R10: dffffc0000000000 R11: fffffbfff1fc79e7 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff9a2700c0 R15: 1ffff920006e0f80
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:637
tnc_init drivers/net/hamradio/6pack.c:525 [inline]
sixpack_open+0x6ce/0x9c0 drivers/net/hamradio/6pack.c:617
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:598 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:584
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f050d98e9a9
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:00007f050e7a7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f050dbb5fa0 RCX: 00007f050d98e9a9
RDX: 0000200000000240 RSI: 0000000000005423 RDI: 0000000000000003
RBP: 00007f050da10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f050dbb5fa0 R15: 00007ffd21513318
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:comedi_inc_scan_progress+0x1a4/0x430 drivers/comedi/drivers.c:556
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 9b 84 cf f8 48 bb 00 00 00
RSP: 0018:ffffc90000007a00 EFLAGS: 00010046
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888059f0a600 R08: dffffc0000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100d0ada01 R12: ffff888059f0a680
R13: 0000000000000002 R14: 0000000000000000 R15: ffff888059f0a62c
FS: 00007f050e7a76c0(0000) GS:ffff8881257ab000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3bff80 CR3: 000000007ef78000 CR4: 00000000003526f0
----------------
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 9b 84 cf f8 call 0xf8cf84d6
3b: 48 rex.W
3c: bb .byte 0xbb
3d: 00 00 add %al,(%rax)