Updated from 2.6.30 to 2.6.31-rc1

$ uname -a
Linux mosly 2.6.31-rc1 #16 SMP PREEMPT Thu Jun 25 22:14:24 EEST 2009 x86_64 Intel(R) Core(TM)2 Duo CPU U7600 @ 1.20GHz GenuineIntel GNU/Linux

All my tun interfaces stopped working. ICMP works but IP(TCP/UDP) does not.
Machine started to hang. I tried to reproduce in linux console. You see the .png result.
.config attached

P.S.: sorry, my lame skills allowed me to shrink 3MB jpg only down to 180KB.
-- 

  Sergei