Вчера вечером сервер (JBoss 5.1GA, Java (TM) SE Runtime Environment (сборка 1.6.0_20-b02), Java HotSpot (TM) 64-разрядная серверная VM, работающая на виртуальной машине Linux на VMWare) внезапно начала использовать 100% процессор. Приложение является довольно типичным бизнес-приложением J2EE, работающим с Seam, ничего особенного в этом. В то время нагрузка была очень низкой.
Мне удалось получить дамп потока, прежде чем процесс был убит и перезапущен (приложение должно быть доступно). У JStack было исключение в его обнаружении тупика; кроме того, что большинство потоков было в BLOCKED.
Является ли это ошибкой JVM? Я этого раньше не видел. После перезагрузки все было в порядке, как в течение нескольких месяцев с момента использования приложения на этом сервере (с периодическими обновлениями).
Спасибо за любые предложения.
Ниже показан слегка отредактированный дамп потока (для установки в пределах ограничения размера сообщения SO). Я удалил несколько идентичных потоков (из различных пулов потоков внутри JBoss/Seam) и оставил только верхние строки из трасс стека.
EDIT: полный дамп потока на http://pastie.org/1083984
[~]$ jstack -F 13553
Attaching to process ID 13553, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 11.3-b02
Deadlock Detection:
java.lang.NullPointerException
at sun.jvm.hotspot.oops.InstanceKlass.computeSubtypeOf(InstanceKlass.java:426)
at sun.jvm.hotspot.oops.Klass.isSubtypeOf(Klass.java:137)
at sun.jvm.hotspot.oops.Oop.isA(Oop.java:92)
at sun.jvm.hotspot.runtime.DeadlockDetector.print(DeadlockDetector.java:93)
at sun.jvm.hotspot.runtime.DeadlockDetector.print(DeadlockDetector.java:39)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:52)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:45)
at sun.jvm.hotspot.tools.JStack.run(JStack.java:60)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:221)
at sun.jvm.hotspot.tools.JStack.main(JStack.java:86)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.tools.jstack.JStack.runJStackTool(JStack.java:118)
at sun.tools.jstack.JStack.main(JStack.java:84)
Can't print deadlocks:null
Thread 26208: (state = BLOCKED)
Thread 25250: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 25249: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 21240: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.Object.wait() @bci=2, line=485 (Interpreted frame)
- org.apache.tomcat.util.net.JIoEndpoint$Worker.await() @bci=8, line=416 (Interpreted frame)
Thread 21140: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.Object.wait() @bci=2, line=485 (Interpreted frame)
- org.apache.tomcat.util.net.JIoEndpoint$Worker.await() @bci=8, line=416 (Interpreted frame)
Thread 21139: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.Object.wait() @bci=2, line=485 (Interpreted frame)
- org.apache.tomcat.util.net.JIoEndpoint$Worker.await() @bci=8, line=416 (Interpreted frame)
Thread 21138: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.Object.wait() @bci=2, line=485 (Interpreted frame)
- org.apache.tomcat.util.net.JIoEndpoint$Worker.await() @bci=8, line=416 (Interpreted frame)
Thread 19380: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 19377: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 19361: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
Thread 19343: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 19317: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 18995: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.Object.wait() @bci=2, line=485 (Interpreted frame)
Thread 18986: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.Object.wait() @bci=2, line=485 (Interpreted frame)
Thread 17659: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 17658: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 17653: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 17631: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 14977: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 14796: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 14609: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 14437: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 14248: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 14232: (state = BLOCKED)
- java.util.Arrays.copyOf(char[], int) @bci=1, line=2882 (Compiled frame)
- java.lang.AbstractStringBuilder.expandCapacity(int) @bci=33, line=100 (Compiled frame)
Thread 14040: (state = IN_NATIVE)
- java.net.PlainSocketImpl.socketAccept(java.net.SocketImpl) @bci=0 (Interpreted frame)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=7, line=384 (Interpreted frame)
Thread 13858: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.ref.ReferenceQueue.remove(long) @bci=44, line=116 (Compiled frame)
Thread 13815: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.Object.wait() @bci=2, line=485 (Interpreted frame)
- org.apache.tomcat.util.net.JIoEndpoint$Worker.await() @bci=8, line=416 (Interpreted frame)
Thread 13814: (state = IN_NATIVE)
- java.net.PlainSocketImpl.socketAccept(java.net.SocketImpl) @bci=0 (Interpreted frame)
Thread 13813: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.Object.wait() @bci=2, line=485 (Interpreted frame)
- org.apache.tomcat.util.net.JIoEndpoint$Worker.await() @bci=8, line=416 (Interpreted frame)
Thread 13812: (state = BLOCKED)
Error occurred during stack walking:
sun.jvm.hotspot.utilities.AssertionFailure: range check
at sun.jvm.hotspot.utilities.Assert.that(Assert.java:32)
at sun.jvm.hotspot.runtime.RegisterMap.<init>(RegisterMap.java:109)
at sun.jvm.hotspot.runtime.x86.X86RegisterMap.<init>(X86RegisterMap.java:39)
at sun.jvm.hotspot.runtime.x86.X86RegisterMap.clone(X86RegisterMap.java:43)
at sun.jvm.hotspot.runtime.VFrame.<init>(VFrame.java:37)
at sun.jvm.hotspot.runtime.JavaVFrame.<init>(JavaVFrame.java:45)
at sun.jvm.hotspot.runtime.CompiledVFrame.<init>(CompiledVFrame.java:43)
at sun.jvm.hotspot.runtime.VFrame.newVFrame(VFrame.java:77)
at sun.jvm.hotspot.runtime.VFrame.sender(VFrame.java:129)
at sun.jvm.hotspot.runtime.VFrame.javaSender(VFrame.java:146)
at sun.jvm.hotspot.runtime.JavaThread.getLastJavaVFrameDbg(JavaThread.java:231)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:76)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:45)
at sun.jvm.hotspot.tools.JStack.run(JStack.java:60)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:221)
at sun.jvm.hotspot.tools.JStack.main(JStack.java:86)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.tools.jstack.JStack.runJStackTool(JStack.java:118)
at sun.tools.jstack.JStack.main(JStack.java:84)
Thread 13811: (state = IN_NATIVE)
- java.net.PlainSocketImpl.socketAccept(java.net.SocketImpl) @bci=0 (Interpreted frame)
Thread 13810: (state = IN_NATIVE)
- java.net.PlainSocketImpl.socketAccept(java.net.SocketImpl) @bci=0 (Interpreted frame)
Thread 13809: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.Object.wait() @bci=2, line=485 (Interpreted frame)
- org.jboss.jms.client.container.ClientConsumer.getMessage(long) @bci=71, line=866 (Interpreted frame)
Thread 13808: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.Object.wait() @bci=2, line=485 (Interpreted frame)
- org.jboss.jms.client.container.ClientConsumer.getMessage(long) @bci=71, line=866 (Interpreted frame)
Thread 13807: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.Object.wait() @bci=2, line=485 (Interpreted frame)
- org.jboss.bootstrap.AbstractServerImpl$LifeThread.run() @bci=11, line=866 (Interpreted frame)
Thread 13806: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 13805: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 13804: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.util.TimerThread.mainLoop() @bci=201, line=509 (Interpreted frame)
Thread 13803: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.util.TimerThread.mainLoop() @bci=201, line=509 (Interpreted frame)
Thread 13802: (state = BLOCKED)
- java.util.Arrays.copyOfRange(char[], int, int) @bci=40, line=3209 (Compiled frame)
- java.lang.String.<init>(char[], int, int) @bci=65, line=216 (Compiled frame)
- java.lang.StringBuffer.toString() @bci=13, line=585 (Compiled frame)
- org.apache.log4j.PatternLayout.format(org.apache.log4j.spi.LoggingEvent) @bci=68, line=506 (Compiled frame)
Thread 13784: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.ref.ReferenceQueue.remove(long) @bci=44, line=116 (Compiled frame)
- org.jboss.el.util.ReferenceCache$ReferenceQueueRunner.run() @bci=1, line=159 (Interpreted frame)
Thread 13753: (state = BLOCKED)
- java.lang.Thread.sleep(long) @bci=0 (Compiled frame; information may be imprecise)
- org.jboss.ejb3.cache.simple.SimpleStatefulCache$SessionTimeoutTask.block() @bci=11, line=210 (Interpreted frame)
Thread 13752: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- org.jboss.resource.connectionmanager.IdleRemover$IdleRemoverRunnable.run() @bci=31, line=167 (Interpreted frame)
Thread 13749: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.Object.wait() @bci=2, line=485 (Interpreted frame)
- org.jboss.remoting.transport.socket.ServerThread.run() @bci=209, line=284 (Interpreted frame)
Thread 13734: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.util.TimerThread.mainLoop() @bci=201, line=509 (Interpreted frame)
Thread 13701: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
Thread 13700: (state = BLOCKED)
- java.lang.Thread.sleep(long) @bci=0 (Compiled frame; information may be imprecise)
- org.jboss.console.plugins.AOPLister$RefreshPoller.run() @bci=41, line=898 (Interpreted frame)
Thread 13699: (state = BLOCKED)
- java.lang.Thread.sleep(long) @bci=0 (Compiled frame; information may be imprecise)
- org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run() @bci=22, line=1590 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 13698: (state = IN_NATIVE)
- java.net.PlainSocketImpl.socketAccept(java.net.SocketImpl) @bci=0 (Interpreted frame)
Thread 13678: (state = BLOCKED)
- sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
- java.util.concurrent.locks.LockSupport.parkNanos(java.lang.Object, long) @bci=20, line=198 (Interpreted frame)
Thread 13554: (state = BLOCKED)
Thread 13560: (state = BLOCKED)
Thread 13559: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.ref.ReferenceQueue.remove(long) @bci=44, line=116 (Compiled frame)
- java.lang.ref.ReferenceQueue.remove() @bci=2, line=132 (Compiled frame)
- java.lang.ref.Finalizer$FinalizerThread.run() @bci=3, line=159 (Compiled frame)
Thread 13558: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.Object.wait() @bci=2, line=485 (Compiled frame)
- java.lang.ref.Reference$ReferenceHandler.run() @bci=46, line=116 (Compiled frame)