>> >If your kernel configuration has DIAGNOSTIC option, you need following
>> >change:
>> 
>> nope.  not me.
>> 
>> >Otherwise, please let me know the panic message.
>> 
>> i was getting "panic: free: addr 0xc0896fc0 not within kmem_map"
>> regardless of the topdown setting.
>
>cited from kern_malloc.c:
>
>#ifdef DIAGNOSTIC
>	/*
>	 * Ensure that we're free'ing something that we could
>	 * have allocated in the first place.  That is, check
>	 * to see that the address is within kmem_map.
>	 */
>	if (__predict_false((vaddr_t)addr < vm_map_min(kmem_map) ||
>	    (vaddr_t)addr >= vm_map_max(kmem_map)))
>		panic("free: addr %p not within kmem_map", addr);
>#endif

doh!  i was looking at the wrong kernel config.  sigh.

i suppose it explains this change, though.

< #define       min_offset              header.start
< #define       max_offset              header.end
> #define       min_offset              header.end
> #define       max_offset              header.start

okay, i'll try again and get back to you.

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