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    SubjectRe: 2.6.15-rc4 panic in __nr_to_section() with CONFIG_SPARSEMEM
    Badari Pulavarty wrote:
    > Hi Andy,
    >
    > I getting a panic while doing "cat /proc/<pid>/smaps" on
    > a process. I debugged a little to find out that faulting
    > IP is in _nr_to_section() - seems to be getting somehow
    > called by pte_offset_map_lock() from smaps_pte_range
    > (which show_smaps) calls.
    >
    > Any ideas on why or how to debug further ?

    From dave's call graph I'd ask the question whether we should be calling
    pfn_valid() before pfn_to_page(). When I reviewed the proposed
    pfn_to_page() implementation I only recall one use and that already had
    the pfn_valid() in it. I'll review -rc4 in the morning.

    -apw
    -
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