Here’s their state:

```

2019-03-29 16:43:53

"Ruby-0-Fiber-286" - Thread t@363
   java.lang.Thread.State: WAITING
	at java.base@11.0.2/jdk.internal.misc.Unsafe.park(Native Method)
	- parking to wait for <69439394> (a java.util.concurrent.SynchronousQueue$TransferStack)
	at java.base@11.0.2/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
	at java.base@11.0.2/java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:460)
	at java.base@11.0.2/java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:361)
	at java.base@11.0.2/java.util.concurrent.SynchronousQueue.put(SynchronousQueue.java:873)
	at app/org.jruby.dist/org.jruby.RubyEnumerator$ThreadedNexter$1.call(RubyEnumerator.java:908)
	at app/org.jruby.dist/org.jruby.runtime.CallBlock.call(CallBlock.java:77)
	at app/org.jruby.dist/org.jruby.runtime.Block.call(Block.java:124)
	at app/org.jruby.dist/org.jruby.RubyYielder$2.call(RubyYielder.java:80)
	at app/org.jruby.dist/org.jruby.runtime.CallBlock19.call(CallBlock19.java:73)
	at app/org.jruby.dist/org.jruby.runtime.Block.call(Block.java:124)
	at app/org.jruby.dist/org.jruby.RubyProc.call(RubyProc.java:286)
	at app/org.jruby.dist/org.jruby.RubyProc.call(RubyProc.java:266)
	at app/org.jruby.dist/org.jruby.RubyYielder.yield(RubyYielder.java:103)
	at app/org.jruby.dist/org.jruby.RubyYielder.op_lshift(RubyYielder.java:112)
	at app/org.jruby.dist/org.jruby.RubyYielder$INVOKER$i$0$0$op_lshift.call(RubyYielder$INVOKER$i$0$0$op_lshift.gen)
	at app/org.jruby.dist/org.jruby.internal.runtime.methods.JavaMethod$JavaMethodN.call(JavaMethod.java:797)
	at app/org.jruby.dist/org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:199)
	at app/org.jruby.dist/org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:170)
	at uri_3a_classloader_3a_.jruby.kernel.enumerator.invokeOther0:\=\^\^(uri:classloader:/jruby/kernel/enumerator.rb:172)
	at uri_3a_classloader_3a_.jruby.kernel.enumerator.RUBY$block$flat_map$2(uri:classloader:/jruby/kernel/enumerator.rb:172)
	at java.base@11.0.2/java.lang.invoke.DirectMethodHandle$Holder.invokeStatic(DirectMethodHandle$Holder)
	at java.base@11.0.2/java.lang.invoke.LambdaForm$MH/0x000000010167c040.invoke(LambdaForm$MH)
	at java.base@11.0.2/java.lang.invoke.Invokers$Holder.invokeExact_MT(Invokers$Holder)
	at app/org.jruby.dist/org.jruby.runtime.CompiledIRBlockBody.yieldDirect(CompiledIRBlockBody.java:146)
	at app/org.jruby.dist/org.jruby.runtime.BlockBody.yield(BlockBody.java:114)
	at app/org.jruby.dist/org.jruby.runtime.Block.yield(Block.java:165)
	at app/org.jruby.dist/org.jruby.RubyArray.each(RubyArray.java:1792)
	at app/org.jruby.dist/org.jruby.RubyArray$INVOKER$i$0$0$each.call(RubyArray$INVOKER$i$0$0$each.gen)
	at app/org.jruby.dist/org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:149)
	at app/org.jruby.dist/org.jruby.runtime.callsite.CachingCallSite.callIter(CachingCallSite.java:158)
	at uri_3a_classloader_3a_.jruby.kernel.enumerator.invokeOther9:each(uri:classloader:/jruby/kernel/enumerator.rb:172)
	at uri_3a_classloader_3a_.jruby.kernel.enumerator.RUBY$block$flat_map$1(uri:classloader:/jruby/kernel/enumerator.rb:172)
	at java.base@11.0.2/java.lang.invoke.DirectMethodHandle$Holder.invokeStatic(DirectMethodHandle$Holder)
	at java.base@11.0.2/java.lang.invoke.LambdaForm$MH/0x00000001016fd040.invoke(LambdaForm$MH)
	at java.base@11.0.2/java.lang.invoke.Invokers$Holder.invokeExact_MT(Invokers$Holder)
	at app/org.jruby.dist/org.jruby.runtime.CompiledIRBlockBody.yieldDirect(CompiledIRBlockBody.java:146)
	at app/org.jruby.dist/org.jruby.runtime.BlockBody.yield(BlockBody.java:122)
	at app/org.jruby.dist/org.jruby.runtime.Block.yieldArray(Block.java:177)
	at app/org.jruby.dist/org.jruby.ir.runtime.IRRuntimeHelpers.yield(IRRuntimeHelpers.java:477)
	at app/org.jruby.dist/org.jruby.ir.targets.YieldSite.yield(YieldSite.java:105)
	at java.base@11.0.2/java.lang.invoke.LambdaForm$DMH/0x00000001006c5840.invokeVirtual(LambdaForm$DMH)
	at java.base@11.0.2/java.lang.invoke.LambdaForm$MH/0x00000001
```