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    SubjectRe: BUG: Global FPU corruption in 2.2
    Date
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    > >1.) If I'm not mistaken switch_to changes current->flags without
    > >atomic operations and without any locks and sys_ptrace changes
    > >child->flags only protected by the big kernel lock.
    >
    > ptrace only operates on processes that are stopped. So there are no
    > locking issues - we've synchronized on a much higher level than a
    > spinlock or semaphore.

    In the 2.2 case the ptrace flags themselves are in the same flag set as
    the PF_ flags. In 2.4 that was fixed. That means there are some bizarre cases
    where current->flags might not be handled perfectly.

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