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    SubjectRe: Bounce buffer deadlock
    > Has anyone else seen a hang like this:
    > bdflush()
    > flush_dirty_buffers()
    > ll_rw_block()
    > submit_bh(buffer X)
    > generic_make_request()
    > __make_request()
    > create_bounce()
    > alloc_bounce_page()
    > alloc_page()
    > try_to_free_pages()
    > do_try_to_free_pages()
    > page_launder()
    > try_to_free_buffers( , 2) -- i.e. wait for buffers
    > sync_page_buffers()
    > __wait_on_buffer(buffer X)

    Whoops. We actually carefully set PF_MEMALLOC to avoid deadlocks here but if
    the buffer is laundered.... ummm

    Looks like page_launder needs to be more careful

    > I hit this in 2.4.6-pre6, and I don't see anything in the ac series to protect
    > against it.

    Not this one no


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