not sure which merge caused this, but i got this boot crash with latest 
-git:

calling  flow_cache_init+0x0/0x1b9 @ 1
initcall flow_cache_init+0x0/0x1b9 returned 0 after 64 usecs
calling  pg_init+0x0/0x37c @ 1
pktgen 2.72: Packet Generator for packet performance testing.
------------[ cut here ]------------
kernel BUG at net/core/pktgen.c:3503!
invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
last sysfs file: 

Pid: 3110, comm: kpktgend_0 Not tainted (2.6.31-tip-05508-g491ae8e-dirty #14761) System Product Name
EIP: 0060:[<c1cd7e68>] EFLAGS: 00010202 CPU: 1
EIP is at pktgen_thread_worker+0x1b88/0x1d10
EAX: 00000001 EBX: 00000000 ECX: 00000002 EDX: 00000003
ESI: 00000001 EDI: f6ba5500 EBP: f6a4bf98 ESP: f6a4be74
 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
Process kpktgend_0 (pid: 3110, ti=f6a4b000 task=f6ba5500 task.ti=f6a4b000)
Stack:
 00000000 f6a4be8c f6ba5500 c2ad7440 00000000 c10b87de f6a4be94 c10b881d
<0> f6a4bea8 c10b88df f6ba5500 f6b85000 f6ba5500 f6ba5500 c1ef0b07 c250b760
<0> f6a4bec4 c10bab64 c414b3šPress any key to enter the menu

config attached.

	Ingo