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    SubjectRe: page->mapping == 0
    From said:
    > Well the ptrace one still has mysteriously breaks usermode linux
    > against it on my list here. Was that ever explained. It looked like
    > the stack got corrupted which is weird.

    If this is the test8 "turn off ORIG_EAX if EIP is changed" fix, it apparently
    also broke a couple of other ptrace-intensive things which aren't coming to
    mind (Andi Kleen noticed them).

    AFAIK, it was never explained. Something would change its victim's EIP and
    the victim would segfault as soon as it was continued.


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