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Apparent process-lock bug

In the version of ZWEI on system 29.95 NWS, with microcode 669, on LISP Machine Eight:

If I do C-X C-F, and while it is waiting in the NET WAIT state I hit [ABORT],
then retry the C-X C-F, it claims that some lock is already locked by the process
(the contents of the lock is a window, and so is the new value).
Evidently the locking is not properly UNWIND-PROTECTed?