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kmem_alloc() vs. VM_MIN_KERNEL_ADDRESS

Sometimes kmem_alloc() returns an address below
VM_MIN_KERNEL_ADDRESS, something like

  kmem_alloc() -> 0xffffaba25800a5a8 with
  VM_MIN_KERNEL_ADDRESS 0xffffad8000000000

It doesn't happen after every reboot and breaks
dtrace which treats the region 0.. VM_MIN_KERNEL_ADDRESS
as toxic.

How could we test against the lowest address the kernel
may use?

J. Hannken-Illjes - - TU Braunschweig

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