JShell uses 100% of one core all the time (JDK 15 Build 27)
Aaron Scott-Boddendijk
talden at gmail.com
Mon Jun 15 23:16:06 UTC 2020
This is the thread-dump from the JVM that VisualVM sees as using a core...
2020-06-16 11:07:35
Full thread dump OpenJDK 64-Bit Server VM (15-ea+27-1372 mixed mode,
sharing):
Threads class SMR info:
_java_thread_list=0x000001e34a6040f0, length=23, elements={
0x000001e31c1a1dc0, 0x000001e349035ee0, 0x000001e349037250,
0x000001e349058ae0,
0x000001e34905c5b0, 0x000001e34905f710, 0x000001e3490603f0,
0x000001e349065140,
0x000001e34906d620, 0x000001e349b36a20, 0x000001e349b8c690,
0x000001e349da3400,
0x000001e349daa7c0, 0x000001e349dbb640, 0x000001e34a141140,
0x000001e349d555c0,
0x000001e34b07f030, 0x000001e34a461c90, 0x000001e34a45fae0,
0x000001e34a45ffb0,
0x000001e34a4617c0, 0x000001e34a462160, 0x000001e34a45f610
}
"main" #1 prio=5 os_prio=0 cpu=1078.13ms elapsed=341.81s
tid=0x000001e31c1a1dc0 nid=0x16b0 in Object.wait() [0x000000340d9fe000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(java.base at 15-ea/Native Method)
- waiting on <no object reference available>
at
jdk.internal.org.jline.utils.NonBlockingInputStreamImpl.read(jdk.internal.le at 15-ea
/NonBlockingInputStreamImpl.java:139)
- locked <0x000000060fe87338> (a
jdk.internal.jshell.tool.ConsoleIOContext$1)
at
jdk.internal.org.jline.utils.NonBlockingInputStream.read(jdk.internal.le at 15-ea
/NonBlockingInputStream.java:62)
at
jdk.internal.org.jline.utils.NonBlocking$NonBlockingInputStreamReader.read(jdk.internal.le at 15-ea
/NonBlocking.java:168)
at
jdk.internal.org.jline.utils.NonBlockingReader.read(jdk.internal.le at 15-ea
/NonBlockingReader.java:57)
at
jdk.internal.org.jline.keymap.BindingReader.readCharacter(jdk.internal.le at 15-ea
/BindingReader.java:160)
at
jdk.internal.org.jline.keymap.BindingReader.readBinding(jdk.internal.le at 15-ea
/BindingReader.java:110)
at
jdk.internal.org.jline.keymap.BindingReader.readBinding(jdk.internal.le at 15-ea
/BindingReader.java:61)
at
jdk.internal.org.jline.reader.impl.LineReaderImpl.doReadBinding(jdk.internal.le at 15-ea
/LineReaderImpl.java:913)
at
jdk.internal.org.jline.reader.impl.LineReaderImpl.readBinding(jdk.internal.le at 15-ea
/LineReaderImpl.java:946)
at
jdk.internal.jshell.tool.ConsoleIOContext$2.readBinding(jdk.jshell at 15-ea
/ConsoleIOContext.java:154)
at
jdk.internal.org.jline.reader.impl.LineReaderImpl.readLine(jdk.internal.le at 15-ea
/LineReaderImpl.java:637)
at
jdk.internal.org.jline.reader.impl.LineReaderImpl.readLine(jdk.internal.le at 15-ea
/LineReaderImpl.java:454)
at
jdk.internal.jshell.tool.ConsoleIOContext.readLine(jdk.jshell at 15-ea
/ConsoleIOContext.java:229)
at jdk.internal.jshell.tool.JShellTool.getInput(jdk.jshell at 15-ea
/JShellTool.java:1254)
at jdk.internal.jshell.tool.JShellTool.run(jdk.jshell at 15-ea
/JShellTool.java:1190)
at jdk.internal.jshell.tool.JShellTool.start(jdk.jshell at 15-ea
/JShellTool.java:991)
at jdk.internal.jshell.tool.JShellToolBuilder.start(jdk.jshell at 15-ea
/JShellToolBuilder.java:254)
at jdk.internal.jshell.tool.JShellToolProvider.main(jdk.jshell at 15-ea
/JShellToolProvider.java:120)
Locked ownable synchronizers:
- None
"Reference Handler" #2 daemon prio=10 os_prio=2 cpu=0.00ms elapsed=341.79s
tid=0x000001e349035ee0 nid=0x13fc waiting on condition [0x000000340e0fe000]
java.lang.Thread.State: RUNNABLE
at
java.lang.ref.Reference.waitForReferencePendingList(java.base at 15-ea/Native
Method)
at java.lang.ref.Reference.processPendingReferences(java.base at 15-ea
/Reference.java:241)
at java.lang.ref.Reference$ReferenceHandler.run(java.base at 15-ea
/Reference.java:213)
Locked ownable synchronizers:
- None
"Finalizer" #3 daemon prio=8 os_prio=1 cpu=0.00ms elapsed=341.79s
tid=0x000001e349037250 nid=0x2a60 in Object.wait() [0x000000340e1fe000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base at 15-ea/Native Method)
- waiting on <0x0000000601400bc0> (a
java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base at 15-ea
/ReferenceQueue.java:155)
- locked <0x0000000601400bc0> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base at 15-ea
/ReferenceQueue.java:176)
at java.lang.ref.Finalizer$FinalizerThread.run(java.base at 15-ea
/Finalizer.java:170)
Locked ownable synchronizers:
- None
"Signal Dispatcher" #4 daemon prio=9 os_prio=2 cpu=0.00ms elapsed=341.78s
tid=0x000001e349058ae0 nid=0x35c8 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"Attach Listener" #5 daemon prio=5 os_prio=2 cpu=125.00ms elapsed=341.78s
tid=0x000001e34905c5b0 nid=0x3e0c waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"Service Thread" #6 daemon prio=9 os_prio=0 cpu=0.00ms elapsed=341.78s
tid=0x000001e34905f710 nid=0x398c runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"C2 CompilerThread0" #7 daemon prio=9 os_prio=2 cpu=1781.25ms
elapsed=341.78s tid=0x000001e3490603f0 nid=0xcf0 waiting on condition
[0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task
Locked ownable synchronizers:
- None
"C1 CompilerThread0" #10 daemon prio=9 os_prio=2 cpu=765.63ms
elapsed=341.78s tid=0x000001e349065140 nid=0x3e54 waiting on condition
[0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task
Locked ownable synchronizers:
- None
"Sweeper thread" #11 daemon prio=9 os_prio=2 cpu=0.00ms elapsed=341.78s
tid=0x000001e34906d620 nid=0x38bc runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"Notification Thread" #12 daemon prio=9 os_prio=0 cpu=0.00ms
elapsed=341.76s tid=0x000001e349b36a20 nid=0x49b8 runnable
[0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"Common-Cleaner" #13 daemon prio=8 os_prio=1 cpu=0.00ms elapsed=341.75s
tid=0x000001e349b8c690 nid=0x26e4 in Object.wait() [0x000000340eaff000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(java.base at 15-ea/Native Method)
- waiting on <no object reference available>
at java.lang.ref.ReferenceQueue.remove(java.base at 15-ea
/ReferenceQueue.java:155)
- locked <0x0000000601401a78> (a java.lang.ref.ReferenceQueue$Lock)
at jdk.internal.ref.CleanerImpl.run(java.base at 15-ea
/CleanerImpl.java:148)
at java.lang.Thread.run(java.base at 15-ea/Thread.java:832)
at jdk.internal.misc.InnocuousThread.run(java.base at 15-ea
/InnocuousThread.java:134)
Locked ownable synchronizers:
- None
"JDI Internal Event Handler" #17 daemon prio=5 os_prio=0 cpu=15.63ms
elapsed=341.39s tid=0x000001e349da3400 nid=0x68 in Object.wait()
[0x000000340effe000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base at 15-ea/Native Method)
- waiting on <no object reference available>
at java.lang.Object.wait(java.base at 15-ea/Object.java:321)
at com.sun.tools.jdi.EventQueueImpl.removeUnfiltered(jdk.jdi at 15-ea
/EventQueueImpl.java:190)
- locked <0x000000060154b630> (a com.sun.tools.jdi.EventQueueImpl)
at com.sun.tools.jdi.EventQueueImpl.removeInternal(jdk.jdi at 15-ea
/EventQueueImpl.java:125)
at com.sun.tools.jdi.InternalEventHandler.run(jdk.jdi at 15-ea
/InternalEventHandler.java:61)
at java.lang.Thread.run(java.base at 15-ea/Thread.java:832)
Locked ownable synchronizers:
- None
"JDI Target VM Interface" #16 daemon prio=5 os_prio=0 cpu=46.88ms
elapsed=341.39s tid=0x000001e349daa7c0 nid=0x3d04 runnable
[0x000000340f0fe000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.SocketDispatcher.read0(java.base at 15-ea/Native Method)
at sun.nio.ch.SocketDispatcher.read(java.base at 15-ea
/SocketDispatcher.java:46)
at sun.nio.ch.NioSocketImpl.tryRead(java.base at 15-ea
/NioSocketImpl.java:261)
at sun.nio.ch.NioSocketImpl.implRead(java.base at 15-ea
/NioSocketImpl.java:312)
at sun.nio.ch.NioSocketImpl.read(java.base at 15-ea
/NioSocketImpl.java:350)
at sun.nio.ch.NioSocketImpl$1.read(java.base at 15-ea
/NioSocketImpl.java:803)
at java.net.Socket$SocketInputStream.read(java.base at 15-ea
/Socket.java:981)
at java.net.Socket$SocketInputStream.read(java.base at 15-ea
/Socket.java:976)
at com.sun.tools.jdi.SocketConnection.readPacket(jdk.jdi at 15-ea
/SocketConnection.java:82)
- locked <0x000000060154b998> (a java.lang.Object)
at com.sun.tools.jdi.TargetVM.run(jdk.jdi at 15-ea/TargetVM.java:124)
at java.lang.Thread.run(java.base at 15-ea/Thread.java:832)
Locked ownable synchronizers:
- <0x0000000601577110> (a
java.util.concurrent.locks.ReentrantLock$NonfairSync)
"event-handler" #18 daemon prio=5 os_prio=0 cpu=0.00ms elapsed=341.38s
tid=0x000001e349dbb640 nid=0x203c in Object.wait() [0x000000340edfe000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base at 15-ea/Native Method)
- waiting on <no object reference available>
at java.lang.Object.wait(java.base at 15-ea/Object.java:321)
at com.sun.tools.jdi.EventQueueImpl.removeUnfiltered(jdk.jdi at 15-ea
/EventQueueImpl.java:190)
- locked <0x000000060154bc28> (a com.sun.tools.jdi.EventQueueImpl)
at com.sun.tools.jdi.EventQueueImpl.remove(jdk.jdi at 15-ea
/EventQueueImpl.java:97)
at com.sun.tools.jdi.EventQueueImpl.remove(jdk.jdi at 15-ea
/EventQueueImpl.java:83)
at jdk.jshell.execution.JdiEventHandler.run(jdk.jshell at 15-ea
/JdiEventHandler.java:79)
at java.lang.Thread.run(java.base at 15-ea/Thread.java:832)
Locked ownable synchronizers:
- None
"output reader" #19 daemon prio=5 os_prio=0 cpu=0.00ms elapsed=341.31s
tid=0x000001e34a141140 nid=0x49c0 runnable [0x000000340eeff000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.SocketDispatcher.read0(java.base at 15-ea/Native Method)
at sun.nio.ch.SocketDispatcher.read(java.base at 15-ea
/SocketDispatcher.java:46)
at sun.nio.ch.NioSocketImpl.tryRead(java.base at 15-ea
/NioSocketImpl.java:261)
at sun.nio.ch.NioSocketImpl.implRead(java.base at 15-ea
/NioSocketImpl.java:312)
at sun.nio.ch.NioSocketImpl.read(java.base at 15-ea
/NioSocketImpl.java:350)
at sun.nio.ch.NioSocketImpl$1.read(java.base at 15-ea
/NioSocketImpl.java:803)
at java.net.Socket$SocketInputStream.read(java.base at 15-ea
/Socket.java:981)
at java.net.Socket$SocketInputStream.read(java.base at 15-ea
/Socket.java:976)
at java.io.FilterInputStream.read(java.base at 15-ea
/FilterInputStream.java:82)
at jdk.jshell.execution.DemultiplexInput.run(jdk.jshell at 15-ea
/DemultiplexInput.java:58)
Locked ownable synchronizers:
- <0x0000000601553510> (a
java.util.concurrent.locks.ReentrantLock$NonfairSync)
"Thread-0" #21 daemon prio=5 os_prio=0 cpu=312.50ms elapsed=341.22s
tid=0x000001e349d555c0 nid=0x4d88 waiting on condition [0x000000340f1fe000]
java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base at 15-ea/Native Method)
- parking to wait for <0x0000000601550fc0> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(java.base at 15-ea
/LockSupport.java:341)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(java.base at 15-ea
/AbstractQueuedSynchronizer.java:505)
at java.util.concurrent.ForkJoinPool.managedBlock(java.base at 15-ea
/ForkJoinPool.java:3137)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base at 15-ea
/AbstractQueuedSynchronizer.java:1614)
at java.util.concurrent.LinkedBlockingQueue.take(java.base at 15-ea
/LinkedBlockingQueue.java:435)
at java.util.concurrent.ThreadPoolExecutor.getTask(java.base at 15-ea
/ThreadPoolExecutor.java:1056)
at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base at 15-ea
/ThreadPoolExecutor.java:1116)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base at 15-ea
/ThreadPoolExecutor.java:630)
at java.lang.Thread.run(java.base at 15-ea/Thread.java:832)
Locked ownable synchronizers:
- None
"Thread-2" #23 daemon prio=5 os_prio=0 cpu=338859.38ms elapsed=340.58s
tid=0x000001e34b07f030 nid=0xac0 runnable [0x000000340f3fe000]
java.lang.Thread.State: RUNNABLE
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base at 15-ea
/AbstractQueuedSynchronizer.java:1749)
at
jdk.internal.org.jline.utils.NonBlockingPumpReader.read(jdk.internal.le at 15-ea
/NonBlockingPumpReader.java:77)
at
jdk.internal.org.jline.utils.NonBlockingReader.read(jdk.internal.le at 15-ea
/NonBlockingReader.java:57)
at
jdk.internal.org.jline.utils.NonBlocking$NonBlockingReaderInputStream.read(jdk.internal.le at 15-ea
/NonBlocking.java:104)
at
jdk.internal.org.jline.utils.NonBlockingInputStream.read(jdk.internal.le at 15-ea
/NonBlockingInputStream.java:36)
at
jdk.internal.jshell.tool.StopDetectingInputStream.lambda$setInputStream$0(jdk.jshell at 15-ea
/StopDetectingInputStream.java:66)
at
jdk.internal.jshell.tool.StopDetectingInputStream$$Lambda$410/0x0000000800d2eb28.run(jdk.jshell at 15-ea/Unknown
Source)
at java.lang.Thread.run(java.base at 15-ea/Thread.java:832)
Locked ownable synchronizers:
- <0x00000006028b4318> (a
java.util.concurrent.locks.ReentrantLock$NonfairSync)
"WindowsStreamPump" #25 daemon prio=5 os_prio=0 cpu=0.00ms elapsed=340.53s
tid=0x000001e34a461c90 nid=0x3688 runnable [0x000000340f4fe000]
java.lang.Thread.State: RUNNABLE
at
jdk.internal.org.jline.terminal.impl.jna.win.Kernel32Impl.WaitForSingleObject(jdk.internal.le at 15-ea/Native
Method)
at
jdk.internal.org.jline.terminal.impl.jna.win.JnaWinSysTerminal.readConsoleInput(jdk.internal.le at 15-ea
/JnaWinSysTerminal.java:185)
at
jdk.internal.org.jline.terminal.impl.jna.win.JnaWinSysTerminal.processConsoleInput(jdk.internal.le at 15-ea
/JnaWinSysTerminal.java:108)
at
jdk.internal.org.jline.terminal.impl.AbstractWindowsTerminal.pump(jdk.internal.le at 15-ea
/AbstractWindowsTerminal.java:465)
at
jdk.internal.org.jline.terminal.impl.AbstractWindowsTerminal$$Lambda$417/0x0000000800d310f8.run(jdk.internal.le at 15-ea/Unknown
Source)
at java.lang.Thread.run(java.base at 15-ea/Thread.java:832)
Locked ownable synchronizers:
- None
"null non blocking reader thread" #26 daemon prio=5 os_prio=0 cpu=0.00ms
elapsed=340.26s tid=0x000001e34a45fae0 nid=0x488 in Object.wait()
[0x000000340f6ff000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base at 15-ea/Native Method)
- waiting on <no object reference available>
at java.lang.Object.wait(java.base at 15-ea/Object.java:321)
at
jdk.internal.jshell.tool.StopDetectingInputStream.read(jdk.jshell at 15-ea
/StopDetectingInputStream.java:98)
- locked <0x0000000601e2b650> (a
jdk.internal.jshell.tool.StopDetectingInputStream)
at
jdk.internal.org.jline.utils.NonBlockingInputStreamImpl.run(jdk.internal.le at 15-ea
/NonBlockingInputStreamImpl.java:216)
at
jdk.internal.org.jline.utils.NonBlockingInputStreamImpl$$Lambda$584/0x0000000800d4f088.run(jdk.internal.le at 15-ea/Unknown
Source)
at java.lang.Thread.run(java.base at 15-ea/Thread.java:832)
Locked ownable synchronizers:
- None
"RMI TCP Accept-0" #27 daemon prio=5 os_prio=0 cpu=0.00ms elapsed=180.89s
tid=0x000001e34a45ffb0 nid=0x45f0 runnable [0x000000340d8fe000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.Net.accept(java.base at 15-ea/Native Method)
at sun.nio.ch.NioSocketImpl.accept(java.base at 15-ea
/NioSocketImpl.java:755)
at java.net.ServerSocket.implAccept(java.base at 15-ea
/ServerSocket.java:684)
at java.net.ServerSocket.platformImplAccept(java.base at 15-ea
/ServerSocket.java:650)
at java.net.ServerSocket.implAccept(java.base at 15-ea
/ServerSocket.java:626)
at java.net.ServerSocket.implAccept(java.base at 15-ea
/ServerSocket.java:583)
at java.net.ServerSocket.accept(java.base at 15-ea
/ServerSocket.java:540)
at
sun.management.jmxremote.LocalRMIServerSocketFactory$1.accept(jdk.management.agent at 15-ea
/LocalRMIServerSocketFactory.java:52)
at
sun.rmi.transport.tcp.TCPTransport$AcceptLoop.executeAcceptLoop(java.rmi at 15-ea
/TCPTransport.java:413)
at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.run(java.rmi at 15-ea
/TCPTransport.java:377)
at java.lang.Thread.run(java.base at 15-ea/Thread.java:832)
Locked ownable synchronizers:
- <0x0000000602e53118> (a
java.util.concurrent.locks.ReentrantLock$NonfairSync)
"RMI TCP Connection(1)-10.0.201.131" #28 daemon prio=5 os_prio=0
cpu=437.50ms elapsed=180.87s tid=0x000001e34a4617c0 nid=0x4790 runnable
[0x000000340fbfe000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.Net.poll(java.base at 15-ea/Native Method)
at sun.nio.ch.NioSocketImpl.park(java.base at 15-ea
/NioSocketImpl.java:181)
at sun.nio.ch.NioSocketImpl.timedRead(java.base at 15-ea
/NioSocketImpl.java:285)
at sun.nio.ch.NioSocketImpl.implRead(java.base at 15-ea
/NioSocketImpl.java:309)
at sun.nio.ch.NioSocketImpl.read(java.base at 15-ea
/NioSocketImpl.java:350)
at sun.nio.ch.NioSocketImpl$1.read(java.base at 15-ea
/NioSocketImpl.java:803)
at java.net.Socket$SocketInputStream.read(java.base at 15-ea
/Socket.java:981)
at java.io.BufferedInputStream.fill(java.base at 15-ea
/BufferedInputStream.java:244)
at java.io.BufferedInputStream.read(java.base at 15-ea
/BufferedInputStream.java:263)
- locked <0x0000000602e19470> (a java.io.BufferedInputStream)
at java.io.FilterInputStream.read(java.base at 15-ea
/FilterInputStream.java:82)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(java.rmi at 15-ea
/TCPTransport.java:569)
at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(java.rmi at 15-ea
/TCPTransport.java:828)
at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(java.rmi at 15-ea
/TCPTransport.java:705)
at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$$Lambda$686/0x0000000800da3998.run(java.rmi at 15-ea/Unknown
Source)
at java.security.AccessController.executePrivileged(java.base at 15-ea
/AccessController.java:753)
at java.security.AccessController.doPrivileged(java.base at 15-ea
/AccessController.java:391)
at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(java.rmi at 15-ea
/TCPTransport.java:704)
at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base at 15-ea
/ThreadPoolExecutor.java:1130)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base at 15-ea
/ThreadPoolExecutor.java:630)
at java.lang.Thread.run(java.base at 15-ea/Thread.java:832)
Locked ownable synchronizers:
- <0x0000000602e19708> (a
java.util.concurrent.ThreadPoolExecutor$Worker)
- <0x0000000602e59038> (a
java.util.concurrent.locks.ReentrantLock$NonfairSync)
"RMI Scheduler(0)" #29 daemon prio=5 os_prio=0 cpu=0.00ms elapsed=180.86s
tid=0x000001e34a462160 nid=0x1df0 waiting on condition [0x000000340fcfe000]
java.lang.Thread.State: TIMED_WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base at 15-ea/Native Method)
- parking to wait for <0x0000000602e1af00> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.parkNanos(java.base at 15-ea
/LockSupport.java:252)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(java.base at 15-ea
/AbstractQueuedSynchronizer.java:1661)
at
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base at 15-ea
/ScheduledThreadPoolExecutor.java:1182)
at
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base at 15-ea
/ScheduledThreadPoolExecutor.java:899)
at java.util.concurrent.ThreadPoolExecutor.getTask(java.base at 15-ea
/ThreadPoolExecutor.java:1056)
at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base at 15-ea
/ThreadPoolExecutor.java:1116)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base at 15-ea
/ThreadPoolExecutor.java:630)
at java.lang.Thread.run(java.base at 15-ea/Thread.java:832)
Locked ownable synchronizers:
- None
"JMX server connection timeout 30" #30 daemon prio=5 os_prio=0 cpu=0.00ms
elapsed=180.86s tid=0x000001e34a45f610 nid=0x2fe8 in Object.wait()
[0x000000340fdff000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(java.base at 15-ea/Native Method)
- waiting on <no object reference available>
at
com.sun.jmx.remote.internal.ServerCommunicatorAdmin$Timeout.run(java.management at 15-ea
/ServerCommunicatorAdmin.java:171)
- locked <0x0000000602e1ca08> (a [I)
at java.lang.Thread.run(java.base at 15-ea/Thread.java:832)
Locked ownable synchronizers:
- None
"VM Thread" os_prio=2 cpu=515.63ms elapsed=341.79s tid=0x000001e349031eb0
nid=0x540 runnable
"GC Thread#0" os_prio=2 cpu=328.13ms elapsed=341.80s tid=0x000001e31c218710
nid=0x19e8 runnable
"GC Thread#1" os_prio=2 cpu=265.63ms elapsed=341.53s tid=0x000001e349b353d0
nid=0x1cc4 runnable
"GC Thread#2" os_prio=2 cpu=218.75ms elapsed=340.37s tid=0x000001e349b350a0
nid=0x1ddc runnable
"GC Thread#3" os_prio=2 cpu=187.50ms elapsed=338.82s tid=0x000001e349b35700
nid=0x4a48 runnable
"GC Thread#4" os_prio=2 cpu=140.63ms elapsed=338.82s tid=0x000001e349b340b0
nid=0x32e8 runnable
"GC Thread#5" os_prio=2 cpu=156.25ms elapsed=338.82s tid=0x000001e349b35a30
nid=0x38cc runnable
"GC Thread#6" os_prio=2 cpu=171.88ms elapsed=338.82s tid=0x000001e349b35d60
nid=0x3ed0 runnable
"G1 Main Marker" os_prio=2 cpu=0.00ms elapsed=341.80s
tid=0x000001e31c229930 nid=0x21c runnable
"G1 Conc#0" os_prio=2 cpu=0.00ms elapsed=341.80s tid=0x000001e31c22a5a0
nid=0x3920 runnable
"G1 Refine#0" os_prio=2 cpu=0.00ms elapsed=341.80s tid=0x000001e31c253f10
nid=0x1f84 runnable
"G1 Young RemSet Sampling" os_prio=2 cpu=0.00ms elapsed=341.80s
tid=0x000001e31c254b90 nid=0x27ac runnable
"VM Periodic Task Thread" os_prio=2 cpu=15.63ms elapsed=341.76s
tid=0x000001e349b39710 nid=0x838 waiting on condition
JNI global refs: 33, weak refs: 0
--
Aaron Scott-Boddendijk
On Tue, Jun 16, 2020 at 10:15 AM Robert Field <robert.field at oracle.com>
wrote:
> Make that jps/jstack
>
> -R
>
> On 2020-06-15 15:12, Robert Field wrote:
> > Thanks for the report.
> >
> > What, if anything, is the Java stack for this thread (jps)?
> >
> > -Robert
> >
> >
> > On 2020-06-15 14:41, Aaron Scott-Boddendijk wrote:
> >> System:
> >> * Windows 10
> >> * Powershell
> >>
> >> When I start JShell, without executing anything, a CPU core is always at
> >> 100% (a single thread though I haven't identified what it's doing).
> >>
> >> The thread stack is as follows (with only the last two items sometimes
> >> change - but I don't know the internals of the JVM to know if this
> >> useful
> >> or significant):
> >>
> >> ntoskrnl.exe!KeSynchronizeExecution+0x5b46
> >> ntoskrnl.exe!KeWaitForSingleObject+0x1c2d
> >> ntoskrnl.exe!KeWaitForSingleObject+0xab4
> >> ntoskrnl.exe!KeWaitForSingleObject+0x255
> >> ntoskrnl.exe!RtlClearBitsEx+0x15a7
> >> ntoskrnl.exe!KeWaitForSingleObject+0x3828
> >> ntoskrnl.exe!KeSynchronizeExecution+0x3120
> >> jvm.dll!c2v_notifyCompilerInliningEvent+0x201797
> >>
> >> The JDK 14 version of JShell does not have this issue but several of the
> >> recent JDK 15 builds have done this.
> >>
> >> --
> >> Aaron Scott-Boddendijk
>
More information about the kulla-dev
mailing list