[WireGuard] mips32 crash

[Jason A. Donenfeld]

Hey k,

> So , guys, I found where shit lies !
> Crash happens only when l2tp is involved.
> I reproduced crash in the following scenario :
>
> Windows ETH -> ETH Dlink ETH L2TP WG -> WG L2TP ETH Ubuntu

Brilliant!

Are you able to trigger this with ordinary iperf? Or just CIFS?

Are you able to trigger this with just host-host l2tp, or do you need
to be forwarding packets?

Can you reproduce this on an x86 kernel running KASAN and the various
debug options in:
https://git.zx2c4.com/WireGuard/tree/src/tests/qemu/debug.config

Thanks for triaging this so far. It's coming along well...

Talk soon,
Jason