JRuby thread dump in wait state

gistfile1.txt

"RubyThread-33: my_code.rb:25" daemon prio=10 tid=0x00007fd08c968000 nid=0x8db in Object.wait() [0x00007fd067447000]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x00000000e4426ef8> (a org.jruby.ext.thread.Queue)
        at java.lang.Object.wait(Object.java:461)
        at org.jruby.RubyThread$SleepTask.run(RubyThread.java:906)
        - locked <0x00000000e4426ef8> (a org.jruby.ext.thread.Queue)
        at org.jruby.RubyThread.executeBlockingTask(RubyThread.java:922)
        at org.jruby.RubyThread.wait_timeout(RubyThread.java:1225)
        at org.jruby.ext.thread.Queue.pop(Queue.java:143)
        - locked <0x00000000e4426ef8> (a org.jruby.ext.thread.Queue)
        at org.jruby.ext.thread.Queue.pop(Queue.java:118)
        - locked <0x00000000e4426ef8> (a org.jruby.ext.thread.Queue)
        at org.jruby.ext.thread.Queue$INVOKER$i$pop.call(Queue$INVOKER$i$pop.gen)
        at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:134)
        at org.jruby.ast.CallNoArgNode.interpret(CallNoArgNode.java:64)
        at org.jruby.ast.LocalAsgnNode.interpret(LocalAsgnNode.java:123)
        at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
        at org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
        at org.jruby.ast.IfNode.interpret(IfNode.java:116)
        at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
        at org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:75)
        at org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:139)
        at org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:172)
        at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:134)
        at org.jruby.ast.VCallNode.interpret(VCallNode.java:88)
        at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
        at org.jruby.ast.IfNode.interpret(IfNode.java:116)
        at org.jruby.ast.InstAsgnNode.interpret(InstAsgnNode.java:95)
        at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
        at org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
        at org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:75)
        at org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:225)
        at org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:204)
        at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:202)
        at org.jruby.ast.CallTwoArgNode.interpret(CallTwoArgNode.java:59)
        at org.jruby.ast.MultipleAsgn19Node.interpret(MultipleAsgn19Node.java:104)
        at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
        at org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
        at org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:75)
        at org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:182)
        at org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:188)
      at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:168)
        at org.jruby.ast.CallOneArgNode.interpret(CallOneArgNode.java:57)
        at org.jruby.ast.LocalAsgnNode.interpret(LocalAsgnNode.java:123)
        at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
        at org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
        at org.jruby.ast.RescueNode.executeBody(RescueNode.java:224)
        at org.jruby.ast.RescueNode.interpret(RescueNode.java:119)
        at org.jruby.ast.BeginNode.interpret(BeginNode.java:83)
        at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
        at org.jruby.ast.WhileNode.interpret(WhileNode.java:131)
        at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
        at org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
        at org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:75)
        at org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:139)
        at org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:172)
        at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:134)
        at org.jruby.ast.CallNoArgNode.interpret(CallNoArgNode.java:64)
        at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
        at org.jruby.evaluator.ASTInterpreter.INTERPRET_BLOCK(ASTInterpreter.java:112)
        at org.jruby.runtime.Interpreted19Block.evalBlockBody(Interpreted19Block.java:209)
        at org.jruby.runtime.Interpreted19Block.yield(Interpreted19Block.java:197)
        at org.jruby.runtime.Interpreted19Block.call(Interpreted19Block.java:128)
        at org.jruby.runtime.Block.call(Block.java:89)
        at org.jruby.RubyProc.call(RubyProc.java:261)
        at org.jruby.RubyProc.call(RubyProc.java:213)
        at org.jruby.internal.runtime.RubyRunnable.run(RubyRunnable.java:98)
        at java.lang.Thread.run(Thread.java:722)