On Fri, Apr 21, 2006 at 01:20:50PM +0200, Ingo Molnar wrote:
>
> * Nick Piggin <[email protected]> wrote:
>
> > It would be interesting to know which assertion failed. I guess it
> > might be a zone alignment problem -- it would be interesting to turn
> > the 2 HOLES_IN_ZONE tests into BUG_ONs, and enable them (ie. move them
> > out of HOLES_IN_ZONE).
>
> ok, i added a couple of printks (see the patch below), and got this:
>
> zone c1f0a600 (HighMem):
> pfn: 00037d00
> zone->zone_start_pfn: 00037e00
> zone->spanned_pages: 00007e00
> zone->zone_start_pfn + zone->spanned_pages: 0003fc00
> ------------[ cut here ]------------
> kernel BUG at mm/page_alloc.c:524!
>
> so the pfn is 1MB below the zone's start address - not good. You can
> find the full bootup log at:
The zones are 2MB aligned, discontig.c seems to do this. They should
be 4MB aligned so the page allocator's assumption that zones are
contiguous to MAX_ORDER is satisfied.
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