Re: [PATCH] RDMA/core: Fix stale RoCE GIDs during netdev events at registration

["Yanjun.Zhu" <yanjun.zhu@linux.dev>]

On 1/27/26 2:16 PM, Tetsuo Handa wrote:
> On 2026/01/28 6:17, Yanjun.Zhu wrote:
>>> Can we feed it to syzkaller please and see if it does actually clear
>>> it's repo? That particular bug already has 5 patches claiming to fix
>>> it.
>>
>> #syz test: repository_link branch
>>
>> The above command will make syzkaller test your commit.
>>
>> BTW, your commit should be the topmost commit.
> No, we can't ask syzbot to test this patch.
>
> All kinds of refcounting errors that appear as
>
>    unregister_netdevice: waiting for $dev to become free. Usage count = $count
>
> problem are reported there, but syzbot has not found a reproducer for
> the bug this patch addresses.
>
> I can test this patch using linux-next tree via my tree if you like.

Thanks. Currently, syzbot does not have a reproducer to reproduce and 
verify this issue.

However, you have a test environment to reproduce the problem, and you 
can verify this commit.

Is that correct?

If so, that would be very helpful.


Zhu Yanjun

>
>>
>> Thanks,
>>
>> Zhu Yanjun
>>
>>> It has become some kind of catch all of all kinds of refcounting errors
>>>
>>> [  247.188486][ T6052] unregister_netdevice: waiting for vcan0 to become free. Usage count = 2
>>>
>>> Does this actually change the refcounting around that could fix that?
>>> Looked like no?
>>>
>>> Jason