Oops: divide error: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 5824 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 2b f7 f4 f8 48 bb 00 00 00
RSP: 0018:ffffc90000007c78 EFLAGS: 00010046
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88807e9e7400 R08: 00000000000000ff R09: 00000000000000ff
R10: dffffc0000000000 R11: ffffed100f82d601 R12: ffff88807e9e7480
R13: 0000000000000002 R14: 0000000000000000 R15: ffff88807e9e742c
FS: 0000555582033500(0000) GS:ffff888125a6e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558204e5c8 CR3: 0000000068088000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 0000000000000003 DR2: 0000000000000008
DR3: 0000000000000000 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: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:memset_orig+0x72/0xb0 arch/x86/lib/memset_64.S:91
Code: 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d8 0f 1f 84 00 00 00 00 00 89 d1 83 e1 38 74 14 c1 e9 03 66 0f 1f 44 00 00 ff c9 <48> 89 07 48 8d 7f 08 75 f5 83 e2 07 74 0a ff ca 88 07 48 8d 7f 01
RSP: 0018:ffffc900040ef950 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000c40 RCX: 0000000000000001
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffff8880792a7000
RBP: 0000000000000c40 R08: dffffc0000000000 R09: 0000000000000000
R10: ffff8880792a7000 R11: fffff5200081df66 R12: ffff88813fe27140
R13: 0000000000001000 R14: ffff8880792a7000 R15: 0000000000001000
release_alloc_meta mm/kasan/generic.c:504 [inline]
kasan_save_alloc_info+0x3b/0x50 mm/kasan/generic.c:568
poison_kmalloc_redzone mm/kasan/common.c:397 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414
kasan_kmalloc include/linux/kasan.h:262 [inline]
__do_kmalloc_node mm/slub.c:5652 [inline]
__kmalloc_noprof+0x41d/0x800 mm/slub.c:5664
kmalloc_noprof include/linux/slab.h:961 [inline]
tomoyo_realpath_from_path+0xe3/0x5d0 security/tomoyo/realpath.c:251
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x213/0x4b0 security/tomoyo/file.c:822
tomoyo_path_unlink+0xa2/0xe0 security/tomoyo/tomoyo.c:162
security_path_unlink+0x167/0x360 security/security.c:1457
do_unlinkat+0x24d/0x560 fs/namei.c:5405
__do_sys_unlink fs/namei.c:5443 [inline]
__se_sys_unlink fs/namei.c:5441 [inline]
__x64_sys_unlink+0x47/0x50 fs/namei.c:5441
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: 0033:0x7f534bd8ecf7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 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:00007ffdf5897b08 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f534bd8ecf7
RDX: 00007ffdf5897b30 RSI: 00007ffdf5897bc0 RDI: 00007ffdf5897bc0
RBP: 00007ffdf5897bc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffdf5898c50
R13: 00007f534be13d7d R14: 0000000000059465 R15: 00007ffdf5898c90
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 2b f7 f4 f8 48 bb 00 00 00
RSP: 0018:ffffc90000007c78 EFLAGS: 00010046
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88807e9e7400 R08: 00000000000000ff R09: 00000000000000ff
R10: dffffc0000000000 R11: ffffed100f82d601 R12: ffff88807e9e7480
R13: 0000000000000002 R14: 0000000000000000 R15: ffff88807e9e742c
FS: 0000555582033500(0000) GS:ffff888125a6e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558204e5c8 CR3: 0000000068088000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 0000000000000003 DR2: 0000000000000008
DR3: 0000000000000000 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 2b f7 f4 f8 call 0xf8f4f766
3b: 48 rex.W
3c: bb .byte 0xbb
3d: 00 00 add %al,(%rax)