Oops: divide error: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 17571 Comm: syz-executor 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 8b 56 fe f8 48 bb 00 00 00
RSP: 0018:ffffc90000007c78 EFLAGS: 00010046
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88807782c600 R08: 00000000000000ff R09: 00000000000000ff
R10: dffffc0000000000 R11: ffffed100facf401 R12: ffff88807782c680
R13: 0000000000000002 R14: 0000000000000000 R15: ffff88807782c62c
FS: 0000555577e52500(0000) GS:ffff888125eba000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c431f06 CR3: 00000000682fc000 CR4: 00000000003526f0
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:255 [inline]
call_irq_handler arch/x86/kernel/irq.c:-1 [inline]
__common_interrupt+0x141/0x1f0 arch/x86/kernel/irq.c:326
common_interrupt+0xb6/0xe0 arch/x86/kernel/irq.c:319
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
RIP: 0010:lock_acquire+0xb0/0x350 kernel/locking/lockdep.c:5844
Code: 75 85 df 0d 00 0f 84 fa 00 00 00 65 8b 05 78 0f d8 10 85 c0 0f 85 eb 00 00 00 65 48 8b 04 25 08 60 76 92 83 b8 2c 0b 00 00 00 <0f> 85 d5 00 00 00 48 c7 44 24 30 00 00 00 00 9c 8f 44 24 30 4c 89
RSP: 0018:ffffc90004fbf630 EFLAGS: 00000246
RAX: ffff88807b381e80 RBX: 0000000000000000 RCX: 16c80cb3c5040800
RDX: 0000000000000000 RSI: ffffffff81d115d7 RDI: 1ffffffff1be7b30
RBP: ffffffff81d115b6 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90004fbf7b8 R11: ffffffff81adcc20 R12: 0000000000000002
R13: ffffffff8df3d980 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
is_bpf_text_address+0x47/0x2b0 kernel/bpf/core.c:744
kernel_text_address+0xa5/0xe0 kernel/extable.c:125
__kernel_text_address+0xd/0x40 kernel/extable.c:79
unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369
arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6663 [inline]
kfree+0x1c0/0x680 mm/slub.c:6871
tomoyo_realpath_from_path+0x598/0x5d0 security/tomoyo/realpath.c:286
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_number_perm+0x1e8/0x5a0 security/tomoyo/file.c:723
security_file_ioctl+0xcb/0x2d0 security/security.c:2435
__do_sys_ioctl fs/ioctl.c:591 [inline]
__se_sys_ioctl+0x47/0x170 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: 0033:0x7f702958f34b
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007ffde3fc98d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f702958f34b
RDX: 00007ffde3fc9930 RSI: 0000000000008933 RDI: 0000000000000005
RBP: 00007ffde3fc9930 R08: 0000000000000008 R09: 00007ffde3fc9962
R10: 00007ffde3fc9d66 R11: 0000000000000246 R12: 00007ffde3fc99b0
R13: 00007f70296150b4 R14: 00007f702a314620 R15: 00007f70296150b4
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 8b 56 fe f8 48 bb 00 00 00
RSP: 0018:ffffc90000007c78 EFLAGS: 00010046
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88807782c600 R08: 00000000000000ff R09: 00000000000000ff
R10: dffffc0000000000 R11: ffffed100facf401 R12: ffff88807782c680
R13: 0000000000000002 R14: 0000000000000000 R15: ffff88807782c62c
FS: 0000555577e52500(0000) GS:ffff888125eba000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c431f06 CR3: 00000000682fc000 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 8b 56 fe f8 call 0xf8fe56c6
3b: 48 rex.W
3c: bb .byte 0xbb
3d: 00 00 add %al,(%rax)