syzbot
general protection fault in wacom_intuos_irq
Status:
upstream: reported C repro on 2026/09/20 21:57
Reported-by: syzbot+02b7795d65f0f213dd83@syzkaller.appspotmail.com
First crash: 3d09h, last: 3d04h
Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000066: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000330-0x0000000000000337]
CPU: 0 PID: 6058 Comm: syz.0.97 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:wacom_intuos_irq+0x33fa/0x34a0 drivers/hid/wacom_wac.c:1082
Code: 7c 24 28 e8 78 67 d9 f9 e9 56 f1 ff ff e8 6e db 80 f9 49 81 c6 30 03 00 00 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 68 67 d9 f9 4d 8b 36 48 b8 00 00 00
RSP: 0018:ffffc90004f2f770 EFLAGS: 00010206
RAX: 0000000000000066 RBX: 1ffff1100fcca46b RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8e2708c0 RDI: 0000000000000000
RBP: ffff88807e652038 R08: ffff88802dadda00 R09: 0000000000000007
R10: 0000000000000011 R11: 0000000000000000 R12: 1ffff1100fcca427
R13: 0000000000000000 R14: 0000000000000330 R15: dffffc0000000000
FS: 000055557050d500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8dd9f909c0 CR3: 00000000796b7000 CR4: 00000000003506f0
Call Trace:
<TASK>
wacom_wac_irq+0xed1/0x9d10 drivers/hid/wacom_wac.c:3474
wacom_raw_event+0xae7/0xe00 drivers/hid/wacom_sys.c:169
hid_input_report+0x3ed/0x500 drivers/hid/hid-core.c:2132
uhid_dev_input2+0xb1/0x130 drivers/hid/uhid.c:610
uhid_char_write+0x4ac/0xc60 drivers/hid/uhid.c:768
vfs_write+0x299/0x9a0 fs/read_write.c:582
ksys_write+0x151/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7540f9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff69b9cd78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7541225fa0 RCX: 00007f7540f9e159
RDX: 0000000000000010 RSI: 0000200000000300 RDI: 0000000000000004
RBP: 00007f754103506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7541225fac R14: 00007f7541225fa0 R15: 00007f7541225fa0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:wacom_intuos_irq+0x33fa/0x34a0 drivers/hid/wacom_wac.c:1082
Code: 7c 24 28 e8 78 67 d9 f9 e9 56 f1 ff ff e8 6e db 80 f9 49 81 c6 30 03 00 00 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 68 67 d9 f9 4d 8b 36 48 b8 00 00 00
RSP: 0018:ffffc90004f2f770 EFLAGS: 00010206
RAX: 0000000000000066 RBX: 1ffff1100fcca46b RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8e2708c0 RDI: 0000000000000000
RBP: ffff88807e652038 R08: ffff88802dadda00 R09: 0000000000000007
R10: 0000000000000011 R11: 0000000000000000 R12: 1ffff1100fcca427
R13: 0000000000000000 R14: 0000000000000330 R15: dffffc0000000000
FS: 000055557050d500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8dda61ce9c CR3: 00000000796b7000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
0: 7c 24 jl 0x26
2: 28 e8 sub %ch,%al
4: 78 67 js 0x6d
6: d9 f9 fyl2xp1
8: e9 56 f1 ff ff jmp 0xfffff163
d: e8 6e db 80 f9 call 0xf980db80
12: 49 81 c6 30 03 00 00 add $0x330,%r14
19: 4c 89 f0 mov %r14,%rax
1c: 48 c1 e8 03 shr $0x3,%rax
20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
27: fc ff df
* 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction
2e: 74 08 je 0x38
30: 4c 89 f7 mov %r14,%rdi
33: e8 68 67 d9 f9 call 0xf9d967a0
38: 4d 8b 36 mov (%r14),%r14
3b: 48 rex.W
3c: b8 .byte 0xb8
3d: 00 00 add %al,(%rax)
Struck through repros no longer work on HEAD.