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From "Santhana Preethi J (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (WW-4817) Threads get blocked due to unnecessary synchronization in OgnlRuntime
Date Fri, 14 Jul 2017 19:10:00 GMT

     [ https://issues.apache.org/jira/browse/WW-4817?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Santhana Preethi J updated WW-4817:
-----------------------------------
    Attachment: ThreadBlock.war
                threadDump.txt

[~lukaszlenart] : To answer your question, I faced this issue when there were 10 concurrent
requests to a single server. 

Also attached a simple application which can be used to reproduce the issue. From the attached
threadDump, you can clearly see how two threads are blocked because the first thread is a
long running one.

> Threads get blocked due to unnecessary synchronization in OgnlRuntime
> ---------------------------------------------------------------------
>
>                 Key: WW-4817
>                 URL: https://issues.apache.org/jira/browse/WW-4817
>             Project: Struts 2
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.3.32, 2.5.12
>            Reporter: Santhana Preethi J
>             Fix For: 2.3.x, 2.5.x
>
>         Attachments: ThreadBlock.war, threadDump.txt
>
>
> In multi-threaded scenario, due to unnecessary synchronization in invokeMethod method
in OgnlRuntime class all threads except the first go to BLOCKED state.
> {code:java}
> public static Object invokeMethod(Object target, Method method, Object[] argsArray)
>     throws InvocationTargetException, IllegalAccessException
>   { 
> .......
>  synchronized (method) {
>       if ((_methodAccessCache.get(method) == null) || (_methodAccessCache.get(method)
== Boolean.TRUE))
>       {
>         syncInvoke = true;
>       }
> .......
>     }
> {code}
> Because *syncInvoke* becomes true for the first thread irrespective of whether the method
is public or not, all other threads go to block state till the first thread leaves the method
invocation synchronization block.
> Attached threadDump of the blocked threads waiting to lock the monitor 0x00000006c690e5b8
even though the method invoked by the action is public.
> {code:java}
> "_###_Thread-1499929571461_###_http-nio-8443-exec-20" #374 daemon prio=5 os_prio=0 tid=0x00007f830513a000
nid=0x49c1 waiting for monitor entry [0x00007f7e9c7c2000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:826)
> 	- waiting to lock <0x00000006c690e5b8> (a java.lang.reflect.Method)
> 	at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1294)
> 	at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
> 	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
> 	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
> 	at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1370)
> 	at ognl.ASTMethod.getValueBody(ASTMethod.java:91)
> 	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
> 	at ognl.SimpleNode.getValue(SimpleNode.java:258)
> 	at ognl.Ognl.getValue(Ognl.java:467)
> 	at ognl.Ognl.getValue(Ognl.java:431)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil$3.execute(OgnlUtil.java:352)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecuteMethod(OgnlUtil.java:404)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil.callMethod(OgnlUtil.java:350)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:430)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:290)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:251)
> 	at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:168)
> 	.........
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	..........
> 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
> 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
> 	at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:240)
> 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
> 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
> 	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
> 	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
> 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1533)
> 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1489)
> 	- locked <0x00000006c5249d98> (a org.apache.tomcat.util.net.NioChannel)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
> 	at java.lang.Thread.run(Thread.java:748)
> "Thread-1499929605769_###_Thread-1499929605766_###_http-nio-8443-exec-19" #373 daemon
prio=5 os_prio=0 tid=0x00007f8305138000 nid=0x49c0 waiting for monitor entry [0x00007f7e9c8c3000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:826)
> 	- waiting to lock <0x00000006c690e5b8> (a java.lang.reflect.Method)
> 	at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1294)
> 	at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
> 	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
> 	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
> 	at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1370)
> 	at ognl.ASTMethod.getValueBody(ASTMethod.java:91)
> 	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
> 	at ognl.SimpleNode.getValue(SimpleNode.java:258)
> 	at ognl.Ognl.getValue(Ognl.java:467)
> 	at ognl.Ognl.getValue(Ognl.java:431)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil$3.execute(OgnlUtil.java:352)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecuteMethod(OgnlUtil.java:404)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil.callMethod(OgnlUtil.java:350)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:430)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:290)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:251)
> 	........
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	.........
> 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
> 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
> 	at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:240)
> 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
> 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
> 	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
> 	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
> 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1533)
> 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1489)
> 	- locked <0x00000006c844cea8> (a org.apache.tomcat.util.net.NioChannel)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
> 	at java.lang.Thread.run(Thread.java:748)
> "Thread-1499929651452_###_Thread-1499929651449_###_http-nio-8443-exec-17" #371 daemon
prio=5 os_prio=0 tid=0x00007f8305134000 nid=0x49be waiting for monitor entry [0x00007f7e9cac4000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:826)
> 	- waiting to lock <0x00000006c690e5b8> (a java.lang.reflect.Method)
> 	at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1294)
> 	at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
> 	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
> 	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
> 	at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1370)
> 	at ognl.ASTMethod.getValueBody(ASTMethod.java:91)
> 	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
> 	at ognl.SimpleNode.getValue(SimpleNode.java:258)
> 	at ognl.Ognl.getValue(Ognl.java:467)
> 	at ognl.Ognl.getValue(Ognl.java:431)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil$3.execute(OgnlUtil.java:352)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecuteMethod(OgnlUtil.java:404)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil.callMethod(OgnlUtil.java:350)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:430)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:290)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:251)
> 	........
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	.........
> 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
> 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
> 	at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:240)
> 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
> 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
> 	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
> 	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
> 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1533)
> 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1489)
> 	- locked <0x00000006c8605150> (a org.apache.tomcat.util.net.NioChannel)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
> 	at java.lang.Thread.run(Thread.java:748)
> "Thread-1499929544435_###_Thread-1499929544432_###_http-nio-8443-exec-13" #367 daemon
prio=5 os_prio=0 tid=0x00007f830512c800 nid=0x49ba runnable [0x00007f7e9cec6000]
>    java.lang.Thread.State: RUNNABLE
> 	at java.net.SocketInputStream.socketRead0(Native Method)
> 	at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
> 	at java.net.SocketInputStream.read(SocketInputStream.java:171)
> 	at java.net.SocketInputStream.read(SocketInputStream.java:141)
> 	at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:114)
> 	at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:161)
> 	at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:189)
> 	- locked <0x00000006c7201d08> (a com.mysql.jdbc.util.ReadAheadInputStream)
> 	at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3014)
> 	at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3467)
> 	at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3456)
> 	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3997)
> 	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2468)
> 	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2629)
> 	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2713)
> 	- locked <0x00000006c6a0cdd0> (a com.mysql.jdbc.JDBC4Connection)
> 	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2663)
> 	at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1599)
> 	- locked <0x00000006c6a0cdd0> (a com.mysql.jdbc.JDBC4Connection)
> 	.........
> 	at sun.reflect.GeneratedMethodAccessor44.invoke(Unknown Source)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	.........
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	..........
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:871)
> 	- locked <0x00000006c690e5b8> (a java.lang.reflect.Method)
> 	at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1294)
> 	at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
> 	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
> 	at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
> 	at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1370)
> 	at ognl.ASTMethod.getValueBody(ASTMethod.java:91)
> 	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
> 	at ognl.SimpleNode.getValue(SimpleNode.java:258)
> 	at ognl.Ognl.getValue(Ognl.java:467)
> 	at ognl.Ognl.getValue(Ognl.java:431)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil$3.execute(OgnlUtil.java:352)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecuteMethod(OgnlUtil.java:404)
> 	at com.opensymphony.xwork2.ognl.OgnlUtil.callMethod(OgnlUtil.java:350)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:430)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:290)
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:251)
> 	..........
> 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:245)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	...........
> 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
> 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
> 	at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:240)
> 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
> 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
> 	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
> 	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
> 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1533)
> 	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1489)
> 	- locked <0x00000006c52e67a8> (a org.apache.tomcat.util.net.NioChannel)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
> 	at java.lang.Thread.run(Thread.java:748)
> {code}
> Modified the syncInvoke checks to prevent this unnecessary blocking
> {code:java}
>  public static Object invokeMethod(Object target, Method method, Object[] argsArray)
>     throws InvocationTargetException, IllegalAccessException
>   {
>     boolean syncInvoke = false;
>     boolean checkPermission = false;
>     boolean wasAccessible = true;
>     synchronized (method) {
>       if ((_methodAccessCache.get(method) == null))
>       {
>         if ((!Modifier.isPublic(method.getModifiers())) || (!Modifier.isPublic(method.getDeclaringClass().getModifiers())))
>         {
>           if (!(wasAccessible = method.isAccessible()))
>           {
>              method.setAccessible(true);
>             _methodAccessCache.put(method, Boolean.TRUE);
>           }
>           else {
>             _methodAccessCache.put(method, Boolean.FALSE);
>           }
>         }
>         else {
>           _methodAccessCache.put(method, Boolean.FALSE);
>         }
>       }
>       if (_methodAccessCache.get(method) == Boolean.TRUE))
>       {
>         syncInvoke = true;
>       }
>       if (((_securityManager != null) && (_methodPermCache.get(method) == null))
|| (_methodPermCache.get(method) == Boolean.FALSE))
>       {
>         checkPermission = true;
>       }
>     }
>     Object result;
>     if (syncInvoke)
>     {
>       synchronized (method)
>       {
>         if (checkPermission)
>         {
>           try
>           {
>             _securityManager.checkPermission(getPermission(method));
>             _methodPermCache.put(method, Boolean.TRUE);
>           } catch (SecurityException ex) {
>             _methodPermCache.put(method, Boolean.FALSE);
>             throw new IllegalAccessException("Method [" + method + "] cannot be accessed.");
>           }
>         }
>         Object result = method.invoke(target, argsArray);
>         if (!wasAccessible)
>         {
>           method.setAccessible(false);
>         }
>       }
>     }
>     else {
>       if (checkPermission)
>       {
>         try
>         {
>           _securityManager.checkPermission(getPermission(method));
>           _methodPermCache.put(method, Boolean.TRUE);
>         } catch (SecurityException ex) {
>           _methodPermCache.put(method, Boolean.FALSE);
>           throw new IllegalAccessException("Method [" + method + "] cannot be accessed.");
>         }
>       }
>       result = method.invoke(target, argsArray);
>     }
>     return result;
>   }
> {code}



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