JBoss Community / Bugs / #1500 org/jboss/mx/loading/LoadMgr.java deadlock

#1500 org/jboss/mx/loading/LoadMgr.java deadlock

Milestone: v3.2

Status: closed-fixed

Owner: Scott M Stark

Labels: JBossMX (91)

Priority: 5

Updated: 2004-04-25

Created: 2003-09-01

Creator: sal ingrilli

Private: No

JBOSS: Release ID: JBoss [WonderLand] 3.2.1 (build:
CVSTag=JBoss_3_2_1 date=200305041533)
OS: Microsoft Windows XP [Version 5.1.2600]
CPU: Intel pentium 4 3Ghz, with hyperthreading
JVM: java version "1.3.1_02", 1.3.1_02-b02
Stack traces: attached
Related issues: 662098

I have 2 threads, each issuing a Class.forName ()
through the following util:

public static Class forName (final String className)
throws ClassNotFoundException {

final Thread currentThread = Thread.currentThread ();
final ClassLoader classLoader =
currentThread.getContextClassLoader ();
final Class newClass = classLoader.loadClass
(className);
return newClass;
}

I get a deadlock in the JBoss LoadMgr quite regularly
during startup.

Discussion

sal ingrilli - 2003-09-01

LoadMgr.nextTask.deadlock.txt

LoadMgr.nextTask.deadlock.txt

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Scott M Stark - 2003-09-02

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Attach a thread dump of the deadlock.

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sal ingrilli - 2003-09-02

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i attached LoadMgr.nextTask.deadlock.txt in the original post.
it contains the traces of 2 threads stuck in LoadMgr.nextTask
()
if you need something different, just shoot & i'll get it to you.

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Scott M Stark - 2003-09-02

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I'm going to need the trace level log as described in the
docs section on class loading debugging.

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sal ingrilli - 2003-09-02

ucl.log

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sal ingrilli - 2003-09-03

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i attached ucl.log on 9/2 but didn't see an email notification
for it. so this is just to generate the notification.

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Scott M Stark - 2003-09-04

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The log file only has 3 lines in it. See this link
https://sourceforge.net/docman/display_doc.php?docid=14918&group_id=22866
for how to configure the trace level logging. It requires
putting the following into the conf/log4j.xml file:

<appender name="UCL" class="org.apache.log4j.FileAppender">
<param name="File"
value="${jboss.server.home.dir}/log/ucl.log"/>
<param name="Append" value="false"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern"
value="[%r,%c{1},%t] %m%n"/>
</layout>
</appender>
<category name="org.jboss.mx.loading" additivity="false">
<priority value="TRACE" class="org.jboss.logging.XLevel"/>
<appender-ref ref="UCL"/>
</category>

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Scott M Stark - 2003-09-04

assigned_to: nobody --> starksm
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sal ingrilli - 2003-09-10

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Attached is a zipped 18Mb ucl.log

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Scott M Stark - 2003-09-10

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This will not fit as an attachment. Send to me directly at
scott@jboss.org

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Scott M Stark - 2003-10-13

status: open --> closed-works-for-me
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Scott M Stark - 2003-10-13

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Reopen when you have a log that shows the deadlock.

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sal ingrilli - 2004-01-24

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JBOSS: Release ID: JBoss [WonderLand] 3.2.1 (build:
CVSTag=JBoss_3_2_1 date=200305041533)
OS: Microsoft Windows XP [Version 5.1.2600]
CPU: Intel pentium 4 3Ghz
JVM: java version "1.3.1_02", 1.3.1_02-b02
Stack traces: attached
Related issues: 662098

Scott:

I was finally able to recreate this with UCL tracing ON as you
had requested.

Let me know what else I can do to help resolve this.

Sal.

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sal ingrilli - 2004-01-24

status: closed-works-for-me --> open-works-for-me
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Scott M Stark - 2004-01-24

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I need the ucl.log zipped up and sent to scott.stark@jboss.org

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Scott M Stark - 2004-04-25

status: open-works-for-me --> closed-fixed
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Scott M Stark - 2004-04-25

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Someone submitted a testcase that demonstrated a way to
deadlock the class loaders and this has been fixed for
3.2.4RC2. Try that version when its out next week.

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