Re: [syzbot] [kernel?] linux-next test error: WARNING in class_for_each_device

[Tetsuo Handa]

On 2026/05/26 15:08, Tetsuo Handa wrote:
> On 2026/05/26 14:55, syzbot wrote:
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit:    d387b06f7c15 Add linux-next specific files for 20260525
>> git tree:       linux-next
>> console output: https://syzkaller.appspot.com/x/log.txt?x=15eb7796580000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=8dd72cf810e753a6
>> dashboard link: https://syzkaller.appspot.com/bug?extid=50b5f81fff158669504a
>> compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
>>
>> Downloadable assets:
>> disk image: https://storage.googleapis.com/syzbot-assets/39490dfbc250/disk-d387b06f.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/0789ac7ac5fc/vmlinux-d387b06f.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/4464df9f5ccf/bzImage-d387b06f.xz
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+50b5f81fff158669504a@xxxxxxxxxxxxxxxxxxxxxxxxx
>>
>> ------------[ cut here ]------------
>> class_for_each_device called for class 'devlink' before it was registered
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/drivers/base?id=1137838865bfc9a7cd5869c1dc5c22aa45ec12c8
> 
> Why "driver_deferred_probe_timeout * HZ" => "driver_deferred_probe_timeout" ?
> 

Here is an analysis from Google AI mode regarding this problem: https://share.google/aimode/UO1WnoKPDSbyjY5Qj

Greg, can you immediately drop commit 1137838865bf ("driver core: Use mod_delayed_work to prevent
lost deferred probe work") so that syzbot can resume testing linux-next tree as soon as possible?