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VM stalls when transferring to a non-blocking fiber #9514

Open
Open
VM stalls when transferring to a non-blocking fiber#9514
Milestone
JRuby 10.1.x

Description

@just-wanna-report-bugs
just-wanna-report-bugs
opened on Jun 29, 2026

Environment Information

  • JRuby version: jruby 10.1.0.0 (4.0.0) 2026-04-20 32f988b OpenJDK 64-Bit Server VM 25.0.2+10-LTS on 25.0.2+10-LTS +indy +jit [x86_64-linux]
  • Operating system and platform: Linux 6.12.94+deb13-amd64 # 1 SMP PREEMPT_DYNAMIC Debian 6.12.94-1 (2026-06-20) x86_64 GNU/Linux
  • JRUBY_OPTS=-Xparser.prism=true -J-XX:+UseParallelGC

The Bug

When calling transfer() inside the fiber() method of a Fiber::Scheduler implementation on a JVM with support for Virtual Threads, the VM stalls after several seconds, failing to enter the fiber in question.

Relevant code snippets are reproduced below:

Fiber::Scheduler#fiber( &block )

def fiber( &block )
  current = Fiber.current
  @nested.append( current ) if current != @primary

  # spawn it
  fiber = Fiber.new( blocking: false, &block )
  fiber.transfer # <-- Stalls here
  return fiber
end

The offending fiber:

INTERVAL = 1.0 / 60.0

@scheduler = Scheduler.new
Fiber.set_scheduler( @scheduler )

# ... more setup performed here ...

# clock (cube updater)
@clock = Fiber.schedule do
  ptr = FFI::MemoryPointer.new( :char, @matrices.size )
  loop do
    break if ctx.window.closing?
    
    # track time, update camera matrix
    head = Process.clock_gettime( Process::CLOCK_MONOTONIC )
    @state.memory.write( @camera.matrix.pack )

    # update matrices
    @transforms.each_with_index {|tf, i|  # Line 216
      tf.rotation.y += 0.02
      ptr.put_array_of_float( i * 64, tf.affine.cells )  # Line 218; various matrix.rb calls here
    }
    @matrices.memory.write( ptr )

    # compute sleep
    tail = Process.clock_gettime( Process::CLOCK_MONOTONIC ) - head
    delta = INTERVAL - tail
    sleep( delta ) if delta > 0
  end
ensure
  ptr.free
end

# report -- bug: THIS IS NEVER REACHED!
time = Process.clock_gettime( Process::CLOCK_MONOTONIC ) - head
puts sprintf('[!] Bootstrapping took: %.6f seconds', time )

Expected Behavior

Note: interestingly enough, when replacing the fiber with a thread, this works without error in JRuby.

The fiber @clock is instantiated in a non-blocking manner and the code immediately proceeds to the report block below, after calling transfer() within Fiber::Scheduler#fiber( &block ).

Meanwhile, the @clock ticks at 60 Hz, updating the relevant values by writing into device memory.

This was tested in Ruby 4.0.5.

Actual Behavior

As stated, the JRuby VM stalls upon the call to transfer(), failing to print anything after that point nor indicate whether it has entered the fiber in question.

Running JavaFlightRecorder was able to capture the error, as far as I have been able to trace it. It appears to stem from transfer() in ThreadFiber.java:315.

At this point, the "main" fiber reports that it has become parked and is waiting on a condition:

"main" #3 [47670] prio=5 os_prio=0 cpu=3414.14ms elapsed=9.51s tid=0x00007f0a0c02cf60 nid=47670 waiting on condition  [0x00007f0a135fc000]
   java.lang.Thread.State: WAITING (parking)
	at jdk.internal.misc.Unsafe.park([email protected]/Native Method)
	- parking to wait for  <0x0000000708378638> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park([email protected]/Unknown Source)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block([email protected]/Unknown Source)
	at java.util.concurrent.ForkJoinPool.unmanagedBlock([email protected]/Unknown Source)
	at java.util.concurrent.ForkJoinPool.managedBlock([email protected]/Unknown Source)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await([email protected]/Unknown Source)
	at java.util.concurrent.ArrayBlockingQueue.take([email protected]/Unknown Source)
	at org.jruby.ext.fiber.FiberQueue$1.run(org.jruby.dist/FiberQueue.java:56)
	at org.jruby.ext.fiber.FiberQueue$1.run(org.jruby.dist/FiberQueue.java:53)
	at org.jruby.RubyThread.executeTask(org.jruby.dist/RubyThread.java:1924)
	at org.jruby.RubyThread.executeTaskBlocking(org.jruby.dist/RubyThread.java:1898)
	at org.jruby.ext.fiber.FiberQueue.pop(org.jruby.dist/FiberQueue.java:92)
	at org.jruby.ext.fiber.ThreadFiber.exchangeWithFiber(org.jruby.dist/ThreadFiber.java:265)
	at org.jruby.ext.fiber.ThreadFiber.transfer(org.jruby.dist/ThreadFiber.java:372)
	at org.jruby.ext.fiber.ThreadFiber$INVOKER$i$0$0$transfer.call(org.jruby.dist/ThreadFiber$INVOKER$i$0$0$transfer.gen)
	at org.jruby.internal.runtime.methods.JavaMethod$JavaMethodN.call(org.jruby.dist/JavaMethod.java:709)
	at org.jruby.internal.runtime.methods.DynamicMethod.call(org.jruby.dist/DynamicMethod.java:217)
	at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(org.jruby.dist/CachingCallSite.java:442)
	at org.jruby.runtime.callsite.CachingCallSite.call(org.jruby.dist/CachingCallSite.java:193)
	at org.jruby.ir.interpreter.InterpreterEngine.processCall(org.jruby.dist/InterpreterEngine.java:352)
	at org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(org.jruby.dist/StartupInterpreterEngine.java:66)
	at org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(org.jruby.dist/MixedModeIRMethod.java:133)
	at org.jruby.internal.runtime.methods.MixedModeIRMethod.call(org.jruby.dist/MixedModeIRMethod.java:120)
	at org.jruby.RubyClass.finvokeWithRefinements(org.jruby.dist/RubyClass.java:644)
	at org.jruby.RubyClass.finvoke(org.jruby.dist/RubyClass.java:632)
	at org.jruby.runtime.Helpers.invoke(org.jruby.dist/Helpers.java:784)
	at org.jruby.RubyBasicObject.callMethod(org.jruby.dist/RubyBasicObject.java:410)
	at org.jruby.ext.fiber.ThreadFiber$FiberSchedulerSupport.schedule(org.jruby.dist/ThreadFiber.java:832)
	at org.jruby.ext.fiber.ThreadFiber$FiberSchedulerSupport$INVOKER$s$0$0$schedule.call(org.jruby.dist/ThreadFiber$FiberSchedulerSupport$INVOKER$s$0$0$schedule.gen)
	at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(org.jruby.dist/CachingCallSite.java:432)
	at org.jruby.runtime.callsite.CachingCallSite.call(org.jruby.dist/CachingCallSite.java:90)
	at org.jruby.runtime.callsite.CachingCallSite.callIter(org.jruby.dist/CachingCallSite.java:101)
	at org.jruby.ir.instructions.CallBase.interpret(org.jruby.dist/CallBase.java:548)
	at org.jruby.ir.interpreter.InterpreterEngine.processCall(org.jruby.dist/InterpreterEngine.java:372)
	at org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(org.jruby.dist/StartupInterpreterEngine.java:66)
	at org.jruby.ir.interpreter.Interpreter.INTERPRET_BLOCK(org.jruby.dist/Interpreter.java:120)
	at org.jruby.runtime.MixedModeIRBlockBody.commonYieldPath(org.jruby.dist/MixedModeIRBlockBody.java:138)
	at org.jruby.runtime.IRBlockBody.doYield(org.jruby.dist/IRBlockBody.java:170)
	at org.jruby.runtime.BlockBody.yield(org.jruby.dist/BlockBody.java:108)
	at org.jruby.runtime.Block.yield(org.jruby.dist/Block.java:191)
	at org.jruby.ir.runtime.IRRuntimeHelpers.yield(org.jruby.dist/IRRuntimeHelpers.java:498)
	at org.jruby.ir.instructions.YieldInstr.interpret(org.jruby.dist/YieldInstr.java:97)
	at org.jruby.ir.interpreter.StartupInterpreterEngine.processOtherOp(org.jruby.dist/StartupInterpreterEngine.java:155)
	at org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(org.jruby.dist/StartupInterpreterEngine.java:98)
	at org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(org.jruby.dist/MixedModeIRMethod.java:133)
	at org.jruby.internal.runtime.methods.MixedModeIRMethod.call(org.jruby.dist/MixedModeIRMethod.java:120)
	at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(org.jruby.dist/CachingCallSite.java:432)
	at org.jruby.runtime.callsite.CachingCallSite.call(org.jruby.dist/CachingCallSite.java:90)
	at org.jruby.runtime.callsite.CachingCallSite.callIter(org.jruby.dist/CachingCallSite.java:101)
	at org.jruby.ir.instructions.CallBase.interpret(org.jruby.dist/CallBase.java:548)
	at org.jruby.ir.interpreter.InterpreterEngine.processCall(org.jruby.dist/InterpreterEngine.java:372)
	at org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(org.jruby.dist/StartupInterpreterEngine.java:66)
	at org.jruby.ir.interpreter.Interpreter.INTERPRET_ROOT(org.jruby.dist/Interpreter.java:100)
	at org.jruby.ir.interpreter.Interpreter.execute(org.jruby.dist/Interpreter.java:85)
	at org.jruby.ir.interpreter.Interpreter.execute(org.jruby.dist/Interpreter.java:35)
	at org.jruby.ir.IRTranslator.execute(org.jruby.dist/IRTranslator.java:42)
	at org.jruby.Ruby.runInterpreter(org.jruby.dist/Ruby.java:1238)
	at org.jruby.Ruby.runInterpreter(org.jruby.dist/Ruby.java:1268)
	at org.jruby.Ruby.runNormally(org.jruby.dist/Ruby.java:1142)
	at org.jruby.Ruby.runFromMain(org.jruby.dist/Ruby.java:982)
	at org.jruby.main.Main.internalRun(org.jruby.dist/Main.java:289)
	at org.jruby.main.Main.run(org.jruby.dist/Main.java:239)
	at org.jruby.main.Main.main(org.jruby.dist/Main.java:211)

Shortly afterward, "ForkJoinPool-1-worker-2" reports that it is carrying virtual thread No. 50 and attempts to run the continuation, after cycling through java.lang.invoke.DelegatingMethodHandle$Holder.delegate and java.lang.invoke.LambdaForm$MH/xyz.guard and java.lang.invoke.LambdaForm$MH/xyz.invoke (where xyz is the hex identifier of the object).

"ForkJoinPool-1-worker-2" #49 [47716] daemon prio=5 os_prio=0 cpu=5657.33ms elapsed=5.96s tid=0x00007f08c17a2730  [0x00007f08e3e17000]
   Carrying virtual thread #50
	at jdk.internal.vm.Continuation.run([email protected]/Unknown Source)
	at java.lang.VirtualThread.runContinuation([email protected]/Unknown Source)
	at java.lang.VirtualThread$$Lambda/0x00000000550f3af8.run([email protected]/Unknown Source)
	at java.util.concurrent.ForkJoinTask$AdaptedRunnableAction.exec([email protected]/Unknown Source)
	at java.util.concurrent.ForkJoinTask.doExec([email protected]/Unknown Source)
	at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec([email protected]/Unknown Source)
	at java.util.concurrent.ForkJoinPool.runWorker([email protected]/Unknown Source)
	at java.util.concurrent.ForkJoinWorkerThread.run([email protected]/Unknown Source)
   Mounted virtual thread #50
	at java.lang.invoke.LambdaForm$DMH/0x0000000055041800.invokeStatic([email protected]/LambdaForm$DMH)
	at java.lang.invoke.LambdaForm$MH/0x00000000555ad800.invoke([email protected]/LambdaForm$MH)
	at java.lang.invoke.LambdaForm$MH/0x00000000555b0c00.invoke([email protected]/LambdaForm$MH)
	at java.lang.invoke.DelegatingMethodHandle$Holder.delegate([email protected]/DelegatingMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x00000000555af000.guard([email protected]/LambdaForm$MH)
	at java.lang.invoke.DelegatingMethodHandle$Holder.delegate([email protected]/DelegatingMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x00000000555af000.guard([email protected]/LambdaForm$MH)
	at java.lang.invoke.DelegatingMethodHandle$Holder.delegate([email protected]/DelegatingMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x00000000555af000.guard([email protected]/LambdaForm$MH)
	at java.lang.invoke.DelegatingMethodHandle$Holder.delegate([email protected]/DelegatingMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x00000000555af000.guard([email protected]/LambdaForm$MH)
	at java.lang.invoke.Invokers$Holder.linkToCallSite([email protected]/Invokers$Holder)
	at home.rien.code.vulkanize.lib.data.matrix.️❤ def multiply #0(/home/rien/code/vulkanize/lib/data/matrix.rb:111)
	at java.lang.invoke.DirectMethodHandle$Holder.invokeStatic([email protected]/DirectMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x000000005562a000.invoke([email protected]/LambdaForm$MH)
	at java.lang.invoke.DelegatingMethodHandle$Holder.delegate([email protected]/DelegatingMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x00000000555b9c00.guard([email protected]/LambdaForm$MH)
	at java.lang.invoke.DelegatingMethodHandle$Holder.delegate([email protected]/DelegatingMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x00000000555b9c00.guard([email protected]/LambdaForm$MH)
	at java.lang.invoke.Invokers$Holder.linkToCallSite([email protected]/Invokers$Holder)
	at home.rien.code.vulkanize.lib.data.matrix.️❤ def mul! #0(/home/rien/code/vulkanize/lib/data/matrix.rb:149)
	at java.lang.invoke.LambdaForm$DMH/0x0000000055684000.invokeStatic([email protected]/LambdaForm$DMH)
	at java.lang.invoke.LambdaForm$MH/0x000000005560e800.invoke([email protected]/LambdaForm$MH)
	at java.lang.invoke.DelegatingMethodHandle$Holder.delegate([email protected]/DelegatingMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x00000000555af000.guard([email protected]/LambdaForm$MH)
	at java.lang.invoke.DelegatingMethodHandle$Holder.delegate([email protected]/DelegatingMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x00000000555af000.guard([email protected]/LambdaForm$MH)
	at java.lang.invoke.Invokers$Holder.linkToCallSite([email protected]/Invokers$Holder)
	at home.rien.code.vulkanize.lib.data.transform.️❤ def affine #0(/home/rien/code/vulkanize/lib/data/transform.rb:49)
	at java.lang.invoke.DirectMethodHandle$Holder.invokeStatic([email protected]/DirectMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x00000000555eb800.invoke([email protected]/LambdaForm$MH)
	at java.lang.invoke.DelegatingMethodHandle$Holder.delegate([email protected]/DelegatingMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x00000000555b9c00.guard([email protected]/LambdaForm$MH)
	at java.lang.invoke.DelegatingMethodHandle$Holder.delegate([email protected]/DelegatingMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x00000000555b9c00.guard([email protected]/LambdaForm$MH)
	at java.lang.invoke.Invokers$Holder.linkToCallSite([email protected]/Invokers$Holder)
	at test.clock.️❤ {} \=\^main\_ #1(test/clock.rb:218)
	at java.lang.invoke.DirectMethodHandle$Holder.invokeStatic([email protected]/DirectMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x0000000055696c00.invoke([email protected]/LambdaForm$MH)
	at java.lang.invoke.LambdaForm$MH/0x00000000555b1400.invokeExact_MT([email protected]/LambdaForm$MH)
	at org.jruby.runtime.CompiledIRBlockBody.callDirect(org.jruby.dist/CompiledIRBlockBody.java:141)
	at org.jruby.runtime.IRBlockBody.call(org.jruby.dist/IRBlockBody.java:66)
	at org.jruby.runtime.IRBlockBody.call(org.jruby.dist/IRBlockBody.java:50)
	at org.jruby.runtime.Block.call(org.jruby.dist/Block.java:172)
	at org.jruby.RubyEnumerable$EachWithIndex.call(org.jruby.dist/RubyEnumerable.java:1106)
	at org.jruby.runtime.CallBlock.doYield(org.jruby.dist/CallBlock.java:91)
	at org.jruby.runtime.BlockBody.yield(org.jruby.dist/BlockBody.java:108)
	at org.jruby.runtime.Block.yield(org.jruby.dist/Block.java:191)
	at org.jruby.RubyArrayNative.each(org.jruby.dist/RubyArrayNative.java:1729)
	at org.jruby.RubyArray$INVOKER$i$0$0$each.call(org.jruby.dist/RubyArray$INVOKER$i$0$0$each.gen)
	at org.jruby.internal.runtime.methods.JavaMethod$JavaMethodZeroBlock.call(org.jruby.dist/JavaMethod.java:498)
	at org.jruby.runtime.callsite.CachingCallSite.call(org.jruby.dist/CachingCallSite.java:88)
	at org.jruby.RubyEnumerable.callEach(org.jruby.dist/RubyEnumerable.java:111)
	at org.jruby.RubyEnumerable.each_with_indexCommon(org.jruby.dist/RubyEnumerable.java:1123)
	at org.jruby.RubyEnumerable.each_with_index(org.jruby.dist/RubyEnumerable.java:1157)
	at org.jruby.RubyEnumerable.each_with_index(org.jruby.dist/RubyEnumerable.java:1147)
	at java.lang.invoke.DirectMethodHandle$Holder.invokeStatic([email protected]/DirectMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x00000000555ad400.invoke([email protected]/LambdaForm$MH)
	at java.lang.invoke.LambdaForm$MH/0x000000005561c800.invoke([email protected]/LambdaForm$MH)
	at java.lang.invoke.DelegatingMethodHandle$Holder.delegate([email protected]/DelegatingMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x00000000555af000.guard([email protected]/LambdaForm$MH)
	at java.lang.invoke.DelegatingMethodHandle$Holder.delegate([email protected]/DelegatingMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x00000000555af000.guard([email protected]/LambdaForm$MH)
	at java.lang.invoke.Invokers$Holder.linkToCallSite([email protected]/Invokers$Holder)
	at test.clock.️❤ {} \=\^main\_ #0(test/clock.rb:216)
	at java.lang.invoke.DirectMethodHandle$Holder.invokeStatic([email protected]/DirectMethodHandle$Holder)
	at java.lang.invoke.LambdaForm$MH/0x0000000055699000.invoke([email protected]/LambdaForm$MH)
	at java.lang.invoke.LambdaForm$MH/0x00000000555b1400.invokeExact_MT([email protected]/LambdaForm$MH)
	at org.jruby.runtime.CompiledIRBlockBody.yieldDirect(org.jruby.dist/CompiledIRBlockBody.java:151)
	at org.jruby.runtime.MixedModeIRBlockBody.yieldDirect(org.jruby.dist/MixedModeIRBlockBody.java:113)
	at org.jruby.runtime.IRBlockBody.yieldSpecific(org.jruby.dist/IRBlockBody.java:74)
	at org.jruby.runtime.Block.yieldSpecific(org.jruby.dist/Block.java:160)
	at org.jruby.RubyKernel.loop(org.jruby.dist/RubyKernel.java:1680)
	at org.jruby.RubyKernel$INVOKER$s$0$0$loop.call(org.jruby.dist/RubyKernel$INVOKER$s$0$0$loop.gen)
	at org.jruby.internal.runtime.methods.JavaMethod$JavaMethodZeroBlock.call(org.jruby.dist/JavaMethod.java:498)
	at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(org.jruby.dist/CachingCallSite.java:432)
	at org.jruby.runtime.callsite.CachingCallSite.call(org.jruby.dist/CachingCallSite.java:90)
	at org.jruby.runtime.callsite.CachingCallSite.callIter(org.jruby.dist/CachingCallSite.java:101)
	at org.jruby.ir.instructions.CallBase.interpret(org.jruby.dist/CallBase.java:548)
	at org.jruby.ir.interpreter.InterpreterEngine.processCall(org.jruby.dist/InterpreterEngine.java:372)
	at org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(org.jruby.dist/StartupInterpreterEngine.java:66)
	at org.jruby.ir.interpreter.Interpreter.INTERPRET_BLOCK(org.jruby.dist/Interpreter.java:120)
	at org.jruby.runtime.MixedModeIRBlockBody.commonYieldPath(org.jruby.dist/MixedModeIRBlockBody.java:138)
	at org.jruby.runtime.IRBlockBody.yieldSpecific(org.jruby.dist/IRBlockBody.java:78)
	at org.jruby.runtime.Block.yieldSpecific(org.jruby.dist/Block.java:160)
	at org.jruby.ext.fiber.ThreadFiber.lambda$createThread$0(org.jruby.dist/ThreadFiber.java:534)
	at org.jruby.ext.fiber.ThreadFiber$$Lambda/0x000000005565dbe0.run(org.jruby.dist/Unknown Source)
	at java.lang.Thread.runWith([email protected]/Unknown Source)
	at java.lang.VirtualThread.run([email protected]/Unknown Source)
	at java.lang.VirtualThread$VThreadContinuation$1.run([email protected]/Unknown Source)
	at jdk.internal.vm.Continuation.enter0([email protected]/Unknown Source)
	at jdk.internal.vm.Continuation.enter([email protected]/Unknown Source)

Other potentially relevant state information:

"VirtualThread-unblocker" #45 [47714] daemon prio=5 os_prio=0 cpu=0.36ms elapsed=5.96s tid=0x00007f08c179ea60 nid=47714 runnable  [0x00007f08e421d000]
   java.lang.Thread.State: RUNNABLE
	at java.lang.VirtualThread.takeVirtualThreadListToUnblock([email protected]/Native Method)
	at java.lang.VirtualThread.unblockVirtualThreads([email protected]/Unknown Source)
	at java.lang.VirtualThread$$Lambda/0x00000000550f3428.run([email protected]/Unknown Source)
	at java.lang.Thread.runWith([email protected]/Unknown Source)
	at java.lang.Thread.run([email protected]/Unknown Source)
	at jdk.internal.misc.InnocuousThread.run([email protected]/Unknown Source)

"ForkJoinPool-1-worker-1" #47 [47715] daemon prio=5 os_prio=0 cpu=0.77ms elapsed=5.96s tid=0x00007f08c17a0de0 nid=47715 waiting on condition  [0x00007f08e401b000]
   java.lang.Thread.State: WAITING (parking)
	at jdk.internal.misc.Unsafe.park([email protected]/Native Method)
	- parking to wait for  <0x00000007bba853c0> (a java.util.concurrent.ForkJoinPool)
	at java.util.concurrent.ForkJoinPool.awaitWork([email protected]/Unknown Source)
	at java.util.concurrent.ForkJoinPool.deactivate([email protected]/Unknown Source)
	at java.util.concurrent.ForkJoinPool.runWorker([email protected]/Unknown Source)
	at java.util.concurrent.ForkJoinWorkerThread.run([email protected]/Unknown Source)

"ForkJoinPool-1-delayScheduler" #51 [47719] daemon prio=5 os_prio=0 cpu=13.04ms elapsed=4.75s tid=0x00007f08bc0f3db0 nid=47719 waiting on condition  [0x00007f08e3a16000]
   java.lang.Thread.State: WAITING (parking)
	at jdk.internal.misc.Unsafe.park([email protected]/Native Method)
	at java.util.concurrent.DelayScheduler.loop([email protected]/Unknown Source)
	at java.util.concurrent.DelayScheduler.run([email protected]/Unknown Source)

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