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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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