[syzbot] [kernel?] WARNING in fw_devlink_drivers_done

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: e7e28506af98 Add linux-next specific files for 20260526
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=169cb92e580000
kernel config: https://syzkaller.appspot.com/x/.config?x=e1701da6552dd9b8
dashboard link: https://syzkaller.appspot.com/bug?extid=c750936fbcad82cf6da9
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0060088615f7/disk-e7e28506.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/bee8a0723af7/vmlinux-e7e28506.xz
kernel image: https://storage.googleapis.com/syzbot-assets/040209574106/bzImage-e7e28506.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c75093...@syzkaller.appspotmail.com

------------[ cut here ]------------
class_for_each_device called for class 'devlink' before it was registered
WARNING: drivers/base/class.c:416 at class_for_each_device+0x2d8/0x390 drivers/base/class.c:415, CPU#1: kworker/1:1/37
Modules linked in:
CPU: 1 UID: 0 PID: 37 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events deferred_probe_timeout_work_func
Code: 8d 1d d8 14 0e 0a 4c 89 e8 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 ef e8 62 ad a5 fc 49 8b 55 00 48 89 df 48 c7 c6 0e 5f 5d 8d <67> 48 0f b9 3a b8 ea ff ff ff eb 1b e8 43 16 3b fc 49 81 c6 90 00
RSP: 0000:ffffc90000ac7a20 EFLAGS: 00010246
RAX: 1ffffffff17868c0 RBX: ffffffff8f986560 RCX: ffff88801e2c9f00
RDX: ffffffff8bc35ac0 RSI: ffffffff8d5d5f0e RDI: ffffffff8f986560
RBP: ffffc90000ac7af8 R08: ffffc90000ac7a7f R09: 0000000000000000
R10: ffffc90000ac7a60 R11: fffff52000158f50 R12: ffffc90000ac7a60
R13: ffffffff8bc34600 R14: 1ffff92000158f48 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff888125fd7000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000000ddb8000 CR4: 00000000003506f0
Call Trace:
<TASK>
fw_devlink_drivers_done+0x35/0x50 drivers/base/core.c:1837
deferred_probe_timeout_work_func+0x21/0x220 drivers/base/dd.c:305
process_one_work+0x98b/0x1630 kernel/workqueue.c:3318
process_scheduled_works kernel/workqueue.c:3401 [inline]
worker_thread+0xb49/0x1140 kernel/workqueue.c:3482
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
----------------
Code disassembly (best guess):
0: 8d 1d d8 14 0e 0a lea 0xa0e14d8(%rip),%ebx # 0xa0e14de
6: 4c 89 e8 mov %r13,%rax
9: 48 c1 e8 03 shr $0x3,%rax
d: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1)
12: 74 08 je 0x1c
14: 4c 89 ef mov %r13,%rdi
17: e8 62 ad a5 fc call 0xfca5ad7e
1c: 49 8b 55 00 mov 0x0(%r13),%rdx
20: 48 89 df mov %rbx,%rdi
23: 48 c7 c6 0e 5f 5d 8d mov $0xffffffff8d5d5f0e,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: b8 ea ff ff ff mov $0xffffffea,%eax
34: eb 1b jmp 0x51
36: e8 43 16 3b fc call 0xfc3b167e
3b: 49 rex.WB
3c: 81 .byte 0x81
3d: c6 (bad)
3e: 90 nop


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

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