vm_thread_new: kstack allocation failed with vm.kmem_size="1536M"

[Pete French]

> You've probably reduced kmem_size from the default.  I don't set anything on
> my 6 GB amd64 system, and I get:
>
> $ sysctl vm.kmem_size vm.kmem_size_max
> vm.kmem_size: 2061496320
> vm.kmem_size_max: 3865468109
>
> I assume your 16GB system would default to even larger numbers.  What values
> do you get without forcing anything in loader.conf?

Nope, I get 419430400 (i.e. 400M) on all the machines without anything
in loader.conf - what version of FreeBSD are you running to get those
numbers ? I thought that 1536M was the absolute maximum for kmem
in versions of FreeBSD before 8-CURRENT.

-pete.