Issue

We're using a log4j SocketAppender to log events. Under load, the SocketAppender gets hung in a native socketWrite0() call, which causes all other request threads that need to log anything getting hung as well. We tried wrapping the SocketAppender in an AsyncAppender but get the same result.

"pool-2-thread-1" daemon prio=10 tid=0x00007fac20005800 nid=0x7666 runnable [0x00007fac60f5c000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:113)
at java.net.SocketOutputStream.write(SocketOutputStream.java:159)
at java.io.ObjectOutputStream$BlockDataOutputStream.drain(ObjectOutputStream.java:1876)
at java.io.ObjectOutputStream$BlockDataOutputStream.setBlockDataMode(ObjectOutputStream.java:1785)
at java.io.ObjectOutputStream.writeNonProxyDesc(ObjectOutputStream.java:1285)
at java.io.ObjectOutputStream.writeClassDesc(ObjectOutputStream.java:1230)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1426)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
at org.apache.log4j.net.SocketAppender.append(SocketAppender.java:268)
at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:251)
- locked <0x00000006eb09a288> (a org.apache.log4j.net.SocketAppender)
at org.jboss.as.logging.logmanager.Log4jAppenderHandler.doPublish(Log4jAppenderHandler.java:129)
at org.jboss.logmanager.ExtHandler.publish(ExtHandler.java:76)
at org.jboss.logmanager.handlers.AsyncHandler$AsyncTask.run(AsyncHandler.java:199)
at java.lang.Thread.run(Thread.java:745)