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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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