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    SubjectRe: infinite loop? with mmap, nfs, pwrite, O_DIRECT
    > I have a smaller test case (4 system calls, and a memset), that causes the test case to hang in
    > unkillable state*, and makes the system load consume an entire CPU.

    Problem still exists in -rc2, but OProfile shows slightly different results:
    samples % symbol name
    2919823 86.8716 unmap_mapping_range
    163379 4.8609 _raw_spin_trylock
    36453 1.0846 prio_tree_first


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