Oops: divide error: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 32384 Comm: syz.9.6776 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: ffffc90005aa9000 RCX: ffffffff88cc375f
RDX: 0000000000000000 RSI: ffffffff88c9df80 RDI: 0000000000000004
RBP: dffffc0000000000 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000001 R11: ffff888049a68c3c R12: ffff888049a68c00
R13: 0000000000000002 R14: 0000000000000000 R15: ffffffff88cc36a0
FS: 00007f314e6406c0(0000) GS:ffff8881249d8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f314e63ff98 CR3: 000000008e759000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
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
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 16 c9 2f f6 48 89 df e8 fe 1c 30 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 45 26 20 f6 65 8b 05 7e 25 3b 08 85 c0 74 16 5b
RSP: 0018:ffffc90002ed7ba0 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff9ae09360 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff8db03325 RDI: ffffffff8bf1dec0
RBP: 0000000000000283 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff908313d7 R11: 0000000000000001 R12: 0000000000000001
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
tnc_init drivers/net/hamradio/6pack.c:490 [inline]
sixpack_open+0x7cd/0x990 drivers/net/hamradio/6pack.c:580
tty_ldisc_open+0x9f/0x120 drivers/tty/tty_ldisc.c:432
tty_set_ldisc+0x32b/0x780 drivers/tty/tty_ldisc.c:563
tiocsetd drivers/tty/tty_io.c:2429 [inline]
tty_ioctl+0xc2d/0x1680 drivers/tty/tty_io.c:2728
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
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: 0033:0x7f314d78efc9
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:00007f314e640038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f314d9e6090 RCX: 00007f314d78efc9
RDX: 0000200000000040 RSI: 0000000000005423 RDI: 0000000000000003
RBP: 00007f314d811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f314d9e6128 R14: 00007f314d9e6090 R15: 00007ffc7380dfc8
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: ffffc90005aa9000 RCX: ffffffff88cc375f
RDX: 0000000000000000 RSI: ffffffff88c9df80 RDI: 0000000000000004
RBP: dffffc0000000000 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000001 R11: ffff888049a68c3c R12: ffff888049a68c00
R13: 0000000000000002 R14: 0000000000000000 R15: ffffffff88cc36a0
FS: 00007f314e6406c0(0000) GS:ffff8881249d8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f314e63ff98 CR3: 000000008e759000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
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)