Re: [bug report] net: udp_tunnel_nic: reference count leak during network namespace migration

On 2026/08/06 22:57, Eric Dumazet wrote:
> On Thu, Aug 6, 2026 at 3:18 PM Tetsuo Handa
> <[email protected]> wrote:
>>
>> Ping?
>>
> 
> Is this a dup of
> https://lore.kernel.org/netdev/[email protected]/T/#u
> ?
> 
> If not, please send a patch.

Symptom is different (memory leak v.s. refcount leak) but fix will be the same.

I will wait for your responses on
https://lkml.kernel.org/r/[email protected] .

> 
>> On 2026/07/18 21:03, Tetsuo Handa wrote:
>>> Description:
>>>
>>>   syzbot is reporting a reference count leak when a netdevsim device configured with
>>>   UDP tunnel offloads is moved to another network namespace, and then the target
>>>   namespace is destroyed.
>>>
>>> Cause of the Leak:
>>>
>>>   The root cause is a structural mismatch between the namespace migration logic in
>>>   __dev_change_net_namespace() and the unregistration path in udp_tunnel_nic_unregister().
>> (...snipped...)
>>