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    SubjectRe: Lockless/Get_User_Pages_Fast causes Xorg 1.4.99.* to lock
    Hugh Dickins wrote:
    > On Fri, 4 Jul 2008, Zan Lynx wrote:
    [cut]
    > Useful info, thank you; even more useful was the Code line in your attachment
    >
    >> [ 269.224557] Code: 00 00 48 b9 00 00 00 00 00 e2 ff ff 48 21 d8 48 c1 e8 0c 48 8d 14 c5 00 00 00 00 48 c1 e0 06 48 29 d0 48 01 c1 0f 84 10 ff ff ff <48> 8b 01 48 89 ca f6 c4 40 74 04 48 8b 51 10 90 ff 42 08 90 ff
    >
    > which is enough to identify the oops as in copy_one_pte's get_page(page).
    > Here's a patch I think we need, which I'm hoping will fix both your
    > crashes - please let us know - thanks a lot.
    >
    > Stop mprotect's pte_modify from wiping out the x86 pte_special bit, which
    > caused oops thereafter when vm_normal_page thought X's abnormal was normal.
    [cut patch]

    I can report that this fixes things for me as well. Thank you.


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