From: Taehee Yoo <ap420...@gmail.com>
Date: Thu, 12 Sep 2019 19:14:37 +0900
> On Thu, 12 Sep 2019 at 18:38, David Miller <da...@davemloft.net> wrote:
>>
>> From: Taehee Yoo <ap420...@gmail.com>
>> Date: Thu, 12 Sep 2019 12:56:19 +0900
>>
>> > I tested with this reproducer commands without lockdep.
>> >
>> > ip link add dummy0 type dummy
>> > ip link add link dummy0 name vlan1 type vlan id 1
>> > ip link set vlan1 up
>> >
>> > for i in {2..200}
>> > do
>> > let A=$i-1
>> >
>> > ip link add name vlan$i link vlan$A type vlan id $i
>> > done
>> > ip link del vlan1 <-- this command is added.
>>
>> Is there any other device type which allows arbitrary nesting depth
>> in this manner other than VLAN? Perhaps it is the VLAN nesting
>> depth that we should limit instead of all of this extra code.
>
> Below device types have the same problem.
> VLAN, BONDING, TEAM, VXLAN, MACVLAN, and MACSEC.
> All the below test commands reproduce a panic.
I think then we need to move the traversals over to a iterative
rather than recursive algorithm.
