ipv4 udplite broken in >=linux-3.0 ?

Hi,

I recently migrated my work from udp to udplite. Thanks for your great effort.

But after I upgraded the kernel from 2.6.38 to 3.0, the ipv4 version
of udplite stops working.
I tested the applications downloaded from Gerrit's udplite wiki, and
found that the ipv6 version works well, but not ipv4.

I did the tests on a Gentoo. The kernels are downloaded from the
official web site.

I don't know how to debug udplite. Can any one of you give me a tip on
how to get more debug info, then I can do further test and provide
with it?

Thanks!

--
Zheng Jinxin