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    SubjectRe: [BUG] sysrq-m oops
    Bob Picco wrote:
    > Chuck Ebbert wrote: [Thu Jun 07 2007, 11:42:38AM EDT]
    >> On 06/06/2007 08:27 PM, john stultz wrote:
    >>> Hey All,
    >>> With 2.6.21 and the current -git, we're seeing the following oops when
    >>> we try sysrq-m:
    >>>
    >> It's here in arch/x86_64/mm/init.c::show_mem():
    >>
    >> for_each_online_pgdat(pgdat) {
    >> for (i = 0; i < pgdat->node_spanned_pages; ++i) {
    > This is probably with sparsemem? I'm working with acme@redhat.com to
    > test a patch. Basically you need to validate the pfn because it
    > could be in a hole. Most arches which support sparsemem perform this
    > check.
    >
    > if (!pfn_valid(pgdat->node_start_pfn + i))
    > continue;
    > bob

    Yep you would want one of those for sure with sparsemem.

    -apw
    >> page = pfn_to_page(pgdat->node_start_pfn + i);
    >> total++;
    >> ======> if (PageReserved(page))
    >> reserved++;
    >> else if (PageSwapCache(page))
    >> cached++;
    >> else if (page_count(page))
    >> shared += page_count(page) - 1;
    >> }
    >> }
    >>
    >> page is completely bogus (it's 0x0000000003480000)
    >> -
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