TimedOutputStream OutputTimerTask call to close on SSL OutputStream blocks -------------------------------------------------------------------------- Key: JBREM-1307 URL: https://issues.jboss.org/browse/JBREM-1307 Project: JBoss Remoting Issue Type: Bug Security Level: Public(Everyone can see) Components: transport Affects Versions: 2.2.3.SP2, 2.5.4.SP4 Environment: JBoss EAP 4.3.0 CP08 and CP10 Reporter: Doug Grove Assignee: Ron Sigal Labels: messaging Fix For: 2.5.4.SP5 Attachments: jboss-remoting-src.jar, jboss-remoting.jar In order to provide a mechanism for timing out a network/socket write operation, the org.jboss.remoting.transport.socket.TimedOutputStream class starts a timer. If the duration of the write operation exceeds the timer interval, then the timer will call close() on the output stream. This interrupts the output stream write() operation and causes the write operation to throw an IOException. When the output stream uses secure sockets (SSL), however, the call to close() on the output stream can block indefinitely. The threads associated with the write() and close() operation will only clear when the tcp keepalive timeout mechanism in the operation system is invoked. This appears to be related to a know bug in the java runtime: http://bugs.sun.com/view_bug.do?bug_id=6358629 Specifically, in a thread dump you will see: "Timer-9" daemon prio=10 tid=0x5016c400 nid=0x2638 waiting on condition [0x4cbad000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x585021a0> (a java.util.concurrent.locks.ReentrantLock$NonfairSync) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158) at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:747) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:778) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1114) at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:186) at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:262) at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:720) at com.sun.net.ssl.internal.ssl.SSLSocketImpl.sendAlert(SSLSocketImpl.java:1720) at com.sun.net.ssl.internal.ssl.SSLSocketImpl.warning(SSLSocketImpl.java:1564) at com.sun.net.ssl.internal.ssl.SSLSocketImpl.closeInternal(SSLSocketImpl.java:1362) - locked <0x58502030> (a com.sun.net.ssl.internal.ssl.SSLSocketImpl) at com.sun.net.ssl.internal.ssl.SSLSocketImpl.close(SSLSocketImpl.java:1301) at com.sun.net.ssl.internal.ssl.AppOutputStream.close(AppOutputStream.java:80) at org.jboss.remoting.transport.socket.TimedOutputStream.close(TimedOutputStream.java:57) at org.jboss.remoting.transport.socket.TimedOutputStream$OutputTimerTask.run(TimedOutputStream.java:145) at java.util.TimerThread.mainLoop(Timer.java:512) at java.util.TimerThread.run(Timer.java:462)