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H A Dkern_umtx.cdiff 189756 Fri Mar 13 04:15:57 MDT 2009 davidxu 1) Check NULL pointer before calling umtx_pi_adjust_locked(), this avoids
a PANIC.
2) Rework locking for POSIX priority-mutex, this fixes a
race where a thread may wait there forever even if the mutex is unlocked.

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