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    SubjectRe: [BUG] sysrq-m oops
    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
    > 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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