On 14.12.16 09:11:47, Ard Biesheuvel wrote:

The NUMA code may get confused by the presence of NOMAP regions within
zones, resulting in spurious BUG() checks where the node id deviates
from the containing zone's node id.

Since the kernel has no business reasoning about node ids of pages it
does not own in the first place, enable CONFIG_HOLES_IN_ZONE to ensure
that such pages are disregarded.

Signed-off-by: Ard Biesheuvel <redacted>

I would rather see a solution other than making pfn_valid checks more
fine grained, but this patch also fixes the issue. So:

Acked-by: Robert Richter <redacted>