Andrew Brown <atatat@atatdot.net> writes:

> >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

enami@rest are after the lunch...