Re: [PATCH v3] mm: make expand_downwards symmetrical toexpand_upwards

[Christoph Lameter]

On Tue, 19 Apr 2011, James Bottomley wrote:

> On Tue, 2011-04-19 at 20:05 +0300, Pekka Enberg wrote:
> > > It seems to be a random intermittent mm crash because the next reboot
> > > crashed with the same trace but after the fsck had completed and the
> > > third came up to the login prompt.
> >
> > Looks like a genuine SLUB problem on parisc. Christoph?
>
> Looking through the slub code, it seems to be making invalid
> assumptions.  All of the node stuff is dependent on CONFIG_NUMA.
> However, we're CONFIG_DISCONTIGMEM (with CONFIG_NUMA not set): on the
> machines I and Dave Anglin have, our physical memory ranges are 0-1GB
> and 64-65GB, so I think slub crashes when we get a page from the high
> memory range ... because it's not expecting a non-zero node number.

Right !NUMA systems only have node 0.
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