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Just observed in current sources (Oct 15 evening) after selecting Tools | Options. Options node gets no children.
Created attachment 3021 [details] Stack trace
Fixed in main trunk. New test added to MutexTest. The problem was that I supposed that CHAIN mode meant that I had to wait. But this was not true when the requesting thread holded the mutex in X mode.http://www.netbeans.org/source/browse/openide/src/org/openide/util/Mutex.java.diff?r1=1.42&r2=1.43
*** Issue 16592 has been marked as a duplicate of this issue. ***
verified
Resolved for 3.4.x or earlier, no new info since then -> closing.