[syzbot] [i2c?] [usb?] INFO: trying to register non-static key in i2c_register_adapter

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: b69053dd3ffb wifi: mt76: Remove blank line after mt792x fi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=151caa9a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=513255d80ab78f2b
dashboard link: https://syzkaller.appspot.com/bug?extid=4718cc0f82054afeea8f
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=131caa9a580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=122377da580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-b69053dd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1b892254af04/vmlinux-b69053dd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/731f0d4ee97f/bzImage-b69053dd.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4718cc...@syzkaller.appspotmail.com

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007f297d9e5fa0 R14: 00007f297d9e5fa0 R15: 0000000000000003
</TASK>
i2c-core: adapter 'DigitalNow DVB-T Dual USB': can't register device (-22)
INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 0 UID: 0 PID: 5486 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
assign_lock_key+0x133/0x150 kernel/locking/lockdep.c:984
register_lock_class+0xcc/0x2e0 kernel/locking/lockdep.c:1299
__lock_acquire+0xae/0x2cf0 kernel/locking/lockdep.c:5112
lock_acquire+0x107/0x340 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
complete_with_flags kernel/sched/completion.c:25 [inline]
complete+0x28/0x1b0 kernel/sched/completion.c:52
device_release+0x9e/0x1d0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x228/0x570 lib/kobject.c:737
i2c_register_adapter+0x75f/0x1150 drivers/i2c/i2c-core-base.c:1576
dvb_usb_i2c_init+0x202/0x2f0 drivers/media/usb/dvb-usb/dvb-usb-i2c.c:31
dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:183 [inline]
dvb_usb_device_init+0xf23/0x2580 drivers/media/usb/dvb-usb/dvb-usb-init.c:310
cxusb_probe+0xff/0x700 drivers/media/usb/dvb-usb/cxusb.c:1630
usb_probe_interface+0x668/0xc90 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26d/0xad0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:801
driver_probe_device+0x4f/0x240 drivers/base/dd.c:831
__device_attach_driver+0x279/0x430 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:500
__device_attach+0x2b8/0x430 drivers/base/dd.c:1031
proc_ioctl+0x447/0x6c0 drivers/usb/core/devio.c:2368
proc_ioctl_default+0xbc/0x100 drivers/usb/core/devio.c:2403
usbdev_do_ioctl drivers/usb/core/devio.c:2767 [inline]
usbdev_ioctl+0x1367/0x20b0 drivers/usb/core/devio.c:2827
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f297d78f7c9
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:00007ffef89f6238 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f297d9e5fa0 RCX: 00007f297d78f7c9
RDX: 0000200000000200 RSI: 00000000c0105512 RDI: 0000000000000004
RBP: 00007ffef89f6290 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007f297d9e5fa0 R14: 00007f297d9e5fa0 R15: 0000000000000003
</TASK>
BUG: unable to handle page fault for address: fffffffffffffff8
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD dd3f067 P4D dd3f067 PUD dd41067 PMD 0
Oops: Oops: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5486 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:swake_up_locked kernel/sched/swait.c:30 [inline]
RIP: 0010:complete_with_flags kernel/sched/completion.c:29 [inline]
RIP: 0010:complete+0x99/0x1b0 kernel/sched/completion.c:52
Code: 89 e7 e8 8a ab 8d 00 4d 8b 3c 24 4d 39 e7 0f 84 d4 00 00 00 49 8d 7f f8 48 89 f8 48 c1 e8 03 80 3c 28 00 74 05 e8 67 ab 8d 00 <49> 8b 7f f8 be 03 00 00 00 31 d2 e8 b7 60 f6 ff 4c 89 ff e8 df 51
RSP: 0018:ffffc900083cf3f8 EFLAGS: 00010046
RAX: 1fffffffffffffff RBX: ffff888040481638 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: fffffffffffffff8
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001079e6c R12: ffff888040481678
R13: 0000000000000001 R14: 0000000000000286 R15: 0000000000000000
FS: 00005555621b9500(0000) GS:ffff88808d416000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff8 CR3: 000000001a1ba000 CR4: 0000000000352ef0
Call Trace:
<TASK>
device_release+0x9e/0x1d0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x228/0x570 lib/kobject.c:737
i2c_register_adapter+0x75f/0x1150 drivers/i2c/i2c-core-base.c:1576
dvb_usb_i2c_init+0x202/0x2f0 drivers/media/usb/dvb-usb/dvb-usb-i2c.c:31
dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:183 [inline]
dvb_usb_device_init+0xf23/0x2580 drivers/media/usb/dvb-usb/dvb-usb-init.c:310
cxusb_probe+0xff/0x700 drivers/media/usb/dvb-usb/cxusb.c:1630
usb_probe_interface+0x668/0xc90 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26d/0xad0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:801
driver_probe_device+0x4f/0x240 drivers/base/dd.c:831
__device_attach_driver+0x279/0x430 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:500
__device_attach+0x2b8/0x430 drivers/base/dd.c:1031
proc_ioctl+0x447/0x6c0 drivers/usb/core/devio.c:2368
proc_ioctl_default+0xbc/0x100 drivers/usb/core/devio.c:2403
usbdev_do_ioctl drivers/usb/core/devio.c:2767 [inline]
usbdev_ioctl+0x1367/0x20b0 drivers/usb/core/devio.c:2827
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f297d78f7c9
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:00007ffef89f6238 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f297d9e5fa0 RCX: 00007f297d78f7c9
RDX: 0000200000000200 RSI: 00000000c0105512 RDI: 0000000000000004
RBP: 00007ffef89f6290 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007f297d9e5fa0 R14: 00007f297d9e5fa0 R15: 0000000000000003
</TASK>
Modules linked in:
CR2: fffffffffffffff8
---[ end trace 0000000000000000 ]---
RIP: 0010:swake_up_locked kernel/sched/swait.c:30 [inline]
RIP: 0010:complete_with_flags kernel/sched/completion.c:29 [inline]
RIP: 0010:complete+0x99/0x1b0 kernel/sched/completion.c:52
Code: 89 e7 e8 8a ab 8d 00 4d 8b 3c 24 4d 39 e7 0f 84 d4 00 00 00 49 8d 7f f8 48 89 f8 48 c1 e8 03 80 3c 28 00 74 05 e8 67 ab 8d 00 <49> 8b 7f f8 be 03 00 00 00 31 d2 e8 b7 60 f6 ff 4c 89 ff e8 df 51
RSP: 0018:ffffc900083cf3f8 EFLAGS: 00010046
RAX: 1fffffffffffffff RBX: ffff888040481638 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: fffffffffffffff8
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001079e6c R12: ffff888040481678
R13: 0000000000000001 R14: 0000000000000286 R15: 0000000000000000
FS: 00005555621b9500(0000) GS:ffff88808d416000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff8 CR3: 000000001a1ba000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 89 e7 mov %esp,%edi
2: e8 8a ab 8d 00 call 0x8dab91
7: 4d 8b 3c 24 mov (%r12),%r15
b: 4d 39 e7 cmp %r12,%r15
e: 0f 84 d4 00 00 00 je 0xe8
14: 49 8d 7f f8 lea -0x8(%r15),%rdi
18: 48 89 f8 mov %rdi,%rax
1b: 48 c1 e8 03 shr $0x3,%rax
1f: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1)
23: 74 05 je 0x2a
25: e8 67 ab 8d 00 call 0x8dab91
* 2a: 49 8b 7f f8 mov -0x8(%r15),%rdi <-- trapping instruction
2e: be 03 00 00 00 mov $0x3,%esi
33: 31 d2 xor %edx,%edx
35: e8 b7 60 f6 ff call 0xfff660f1
3a: 4c 89 ff mov %r15,%rdi
3d: e8 .byte 0xe8
3e: df .byte 0xdf
3f: 51 push %rcx


---
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If you want to undo deduplication, reply with:
#syz undup

[Hillf Danton]

> Date: Mon, 05 Jan 2026 00:31:24 -0800

> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: b69053dd3ffb wifi: mt76: Remove blank line after mt792x fi..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=151caa9a580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=513255d80ab78f2b
> dashboard link: https://syzkaller.appspot.com/bug?extid=4718cc0f82054afeea8f
> compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=131caa9a580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=122377da580000

#syz test

--- x/drivers/i2c/i2c-core-base.c
+++ y/drivers/i2c/i2c-core-base.c
@@ -1573,7 +1573,6 @@ static int i2c_register_adapter(struct i
res = device_add(&adap->dev);
if (res) {
pr_err("adapter '%s': can't register device (%d)\n", adap->name, res);
- put_device(&adap->dev);
goto out_list;
}

--

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+4718cc...@syzkaller.appspotmail.com
Tested-by: syzbot+4718cc...@syzkaller.appspotmail.com

Tested on:

commit: 3609fa95 Merge tag 'devicetree-fixes-for-6.19-2' of gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=135d9efc580000

kernel config: https://syzkaller.appspot.com/x/.config?x=513255d80ab78f2b
dashboard link: https://syzkaller.appspot.com/bug?extid=4718cc0f82054afeea8f
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

patch: https://syzkaller.appspot.com/x/patch.diff?x=15273f84580000

Note: testing is done by a robot and is best-effort only.