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I have disabled Clazz module, while there was a folder full of .class files opened in the Explorer. I've re-enabled it a while after that and the IDE locked up. Please see the attachment with threaddump of the two mutually locked threads.
Created attachment 4907 [details] Thread dump
People, please mark this kind of bug with the THREAD keyword
Fixed in DataObjectPool (rev 1.57). Calling of setValid(false) was moved out of the synchronized block.
*** Issue 17666 has been marked as a duplicate of this issue. ***
*** Issue 19212 has been marked as a duplicate of this issue. ***
*** Issue 19364 has been marked as a duplicate of this issue. ***
verified in 2002010110100
Resolved for 3.4.x or earlier, no new info since then -> closing.