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    SubjectRe: [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards
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    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.

    James




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