Andrew Morton wrote:
[snip]

>>IP: routing cache hash table of 4096 buckets, 32KBytes
>>kmem_cache_create: Early error in slab ip_fib_hash
>>-----[ cut here ] -----
>>kernel BUG at mm/slab.c:1185!
>>invalid operand: 0000 [#1]
>>PREEMPT

[snip]

I am hitting the same stop on my amd64 box.  With your patch the
following is reported:

in_interrupt(): 268435200  (ie 0x0fffff00)
preempt_count(): ffffffff
size: 336
kmem_cache_create: Early error in slab xfrm_dst_cache
-----[ cut here
Kernel bug at slab:1188
invalid operand 0000 [1] PREEMPT

Attached is my .config