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    SubjectRe: [PATCH] i386: For debugging, make the initial page table setup less forgiving.
    Andrew Morton wrote:

    >
    > This patch causes oopses after a minute or so running LTP's
    >
    > ./testcases/bin/growfiles -W gf16 -b -e 1 -i 0 -L 120 -u -g 4090 -T 100 -t 408990 -l -C 10 -c 1000 -S 10 -f Lgf02_
    >
    > on everyone's favoutite Vaio, configured with
    > http://userweb.kernel.org/~akpm/config-sony.txt
    >

    *BLINK*

    This patch only affects the initial page tables, which should have been
    thrown out *way* long ago at this point.

    Yet they seem to have stuck around. This is a very bad thing on many
    levels, especially since we should have switched the kernel 1:1 area
    over to PSE pages a long time ago.

    > BUG: unable to handle kernel paging request at virtual address c084fa8c
    > printing eip:
    > c0174c46
    > *pde = 0042a027
    > *pte = 00000000

    Touching a non-PSE page which is zero, and quite consistent with being a
    remnant from the original page tables.

    Methinks this has smoked out a bug in the initial page table setup which
    probably has been a performance roadblock for quite some time.

    -hpa
    -
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