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    SubjectRe: [PATCH for 3.2.34] memcg: do not trigger OOM from add_to_page_cache_locked
    On Fri 08-02-13 17:29:18, Michal Hocko wrote:
    [...]
    > OK, I have checked the allocator slow path and you are right even
    > GFP_KERNEL will not fail. This can lead to similar deadlocks - e.g.
    > OOM killed task blocked on down_write(mmap_sem) while the page fault
    > handler holding mmap_sem for reading and allocating a new page without
    > any progress.

    And now that I think about it some more it sounds like it shouldn't be
    possible because allocator would fail because it would see
    TIF_MEMDIE (OOM killer kills all threads that share the same mm).
    But maybe there are other locks that are dangerous, but I think that the
    risk is pretty low.
    --
    Michal Hocko
    SUSE Labs


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