[jboss-jira] [JBoss JIRA] (JBAS-9537) AsyncAppender and URLWatchTimerTask deadlock

[Theodore Lizard (JIRA)]

Theodore Lizard created JBAS-9537:
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             Summary: AsyncAppender and URLWatchTimerTask deadlock
                 Key: JBAS-9537
                 URL: https://issues.jboss.org/browse/JBAS-9537
             Project: Application Server 3  4  5 and 6
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: Logging
    Affects Versions: JBossAS-4.2.1.GA
         Environment: CentOS release 5.9, JBoss 4.2.1, Oracle Java 1.7.0_21, VMWare virtual machine
            Reporter: Theodore Lizard
            Assignee: David Lloyd


Logging stops if AsyncAppender's buffer is full and logging is reconfigured.

Example: I want to get detailed logs of something so I modify jboss-log4j.xml and change priority of some category to DEBUG. I tail the log file and it stops. Stackdump reveals the following:


"Timer-0" daemon prio=10 tid=0x000000001c956000 nid=0x8b1 in Object.wait() [0x00002ae22e8c0000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	at java.lang.Thread.join(Unknown Source)
	- locked <0x0000000096a71230> (a java.lang.Thread)
	at java.lang.Thread.join(Unknown Source)
	at org.apache.log4j.AsyncAppender.close(AsyncAppender.java:240)
	at org.apache.log4j.helpers.AppenderAttachableImpl.removeAllAppenders(AppenderAttachableImpl.java:140)
	at org.apache.log4j.Category.removeAllAppenders(Category.java:868)
	- locked <0x00000000c850b4e0> (a org.apache.log4j.spi.RootLogger)
	at org.apache.log4j.xml.DOMConfigurator.parseChildrenOfLoggerElement(DOMConfigurator.java:410)
	at org.apache.log4j.xml.DOMConfigurator.parseRoot(DOMConfigurator.java:394)
	- locked <0x00000000c850b4e0> (a org.apache.log4j.spi.RootLogger)
	at org.apache.log4j.xml.DOMConfigurator.parse(DOMConfigurator.java:829)
	at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:712)
	at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:618)
	at org.apache.log4j.xml.DOMConfigurator.configure(DOMConfigurator.java:743)
	at org.jboss.logging.Log4jService$URLWatchTimerTask.reconfigure(Log4jService.java:643)
	at org.jboss.logging.Log4jService$URLWatchTimerTask.run(Log4jService.java:582)
	at java.util.TimerThread.mainLoop(Unknown Source)
	at java.util.TimerThread.run(Unknown Source)


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