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    SubjectRe: Race between vmtruncate and mapped areas?
    Dave McCracken <> wrote:
    > Actually it does fix it. I added code in vmtruncate_list() to do a
    > down_write(&vma->vm_mm->mmap_sem) around the zap_page_range(), and the
    > problem went away. It serializes against any outstanding page faults on a
    > particular page table. New faults will see that the page is no longer in
    > the file and fail with SIGBUS. Andrew's test case stopped failing.
    > I've attached the patch so you can see what I did.
    > Can anyone think of any gotchas to this solution?

    mmap_sem nests outside i_shared_sem.
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