0003423: ClassEntry/SystemClassLoader deadlock

Viewing Issue Advanced Details [ Jump to Notes ]

[ View Simple ] [ Issue History ] [ Print ]

Category

Severity

Reproducibility

Date Submitted

Last Update

0003423

[Resin]

minor

always

03-27-09 07:11

05-07-09 13:16

Reporter

ferg

View Status

public

Assigned To

ferg

Priority

normal

Resolution

fixed

Platform

Status

closed

Projection

none

OS Version

ETA

none

Fixed in Version

4.0.1

Product Version

3.1.8

Product Build

Summary

0003423: ClassEntry/SystemClassLoader deadlock

Description

I've occassionally found a thread deadlock in a halted instance of Resin-3.1.8.
I've appended the jstack trace.

Xalan XSLTC does employ some aggressive classloading, since it's a XSLT-to-java compiler.
It seems that it would occassionally (I don't remember this happening often) cause resin's
classloader to fail.

Looks like thread http--8123-29 and thread http--8123-33 are deadlocked in the classloader code,

Found one Java-level deadlock:
=============================
"http--8123-120$22712691":
waiting to lock monitor 0x08b126ac (object 0x5828b390, a ru.sbtc.util.StylesheetManager),
which is held by "http--8123-25$8931423"
"http--8123-25$8931423":
waiting to lock monitor 0x08b0b5e0 (object 0x5525c6b0, a com.caucho.loader.SystemClassLoader),
which is held by "http--8123-33$15917864"
"http--8123-33$15917864":
waiting to lock monitor 0x089d2be0 (object 0x5d3fea48, a com.caucho.loader.ClassEntry),
which is held by "http--8123-29$31079116"
"http--8123-29$31079116":
waiting to lock monitor 0x08b0b5e0 (object 0x5525c6b0, a com.caucho.loader.SystemClassLoader),
which is held by "http--8123-33$15917864"

Java stack information for the threads listed above:
===================================================
"http--8123-120$22712691":
       at ru.sbtc.util.StylesheetManager.getTransformer(StylesheetManager.java:139)
       - waiting to lock <0x5828b390> (a ru.sbtc.util.StylesheetManager)
       at ru.sbtc.sitebuilder.servlet.XMLMenuServlet.doGet(XMLMenuServlet.java:84)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:114)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:91)
...
"http--8123-25$8931423":
       at org.apache.xalan.xsltc.compiler.XPathLexer.<init>(XPathLexer.java:165)
       at org.apache.xalan.xsltc.compiler.Parser.parseTopLevel(Parser.java:1092)
       at org.apache.xalan.xsltc.compiler.Parser.parseExpression(Parser.java:1055)
       at org.apache.xalan.xsltc.compiler.If.parseContents(If.java:61)
       at org.apache.xalan.xsltc.compiler.SyntaxTreeNode.parseChildren(SyntaxTreeNode.java:432)
       at org.apache.xalan.xsltc.compiler.VariableBase.parseContents(VariableBase.java:229)
       at org.apache.xalan.xsltc.compiler.Variable.parseContents(Variable.java:53)
       at org.apache.xalan.xsltc.compiler.Stylesheet.parseOwnChildren(Stylesheet.java:577)
       at org.apache.xalan.xsltc.compiler.Stylesheet.parseContents(Stylesheet.java:559)
       at org.apache.xalan.xsltc.compiler.Parser.createAST(Parser.java:383)
       at org.apache.xalan.xsltc.compiler.XSLTC.compile(XSLTC.java:361)
       at org.apache.xalan.xsltc.compiler.XSLTC.compile(XSLTC.java:446)
       at org.apache.xalan.xsltc.trax.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:799)
       at ru.sbtc.util.StylesheetManager.loadTemplates(StylesheetManager.java:174)
       at ru.sbtc.util.StylesheetManager.getTransformer(StylesheetManager.java:161)
       - locked <0x5828b390> (a ru.sbtc.util.StylesheetManager)
       at ru.sbtc.sitebuilder.servlet.XMLMenuServlet.doGet(XMLMenuServlet.java:84)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:114)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:91)
...
"http--8123-33$15917864":
       at com.caucho.loader.DynamicClassLoader.loadClass(DynamicClassLoader.java:1431)
       - waiting to lock <0x5d3fea48> (a com.caucho.loader.ClassEntry)
       at com.caucho.loader.DynamicClassLoader.findClassImpl(DynamicClassLoader.java:1390)
       at com.caucho.loader.DynamicClassLoader.loadClassImpl(DynamicClassLoader.java:1289)
       at com.caucho.loader.SystemClassLoader.loadClassImpl(SystemClassLoader.java:217)
       at com.caucho.loader.DynamicClassLoader.loadClass(DynamicClassLoader.java:1219)
       at com.caucho.loader.DynamicClassLoader.loadClass(DynamicClassLoader.java:1203)
       at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
       - locked <0x5525c6b0> (a com.caucho.loader.SystemClassLoader)
       at org.apache.xalan.xsltc.compiler.Stylesheet.setImportPrecedence(Stylesheet.java:324)
       at org.apache.xalan.xsltc.compiler.Import.parseContents(Import.java:115)
       at org.apache.xalan.xsltc.compiler.Stylesheet.parseOwnChildren(Stylesheet.java:587)
       at org.apache.xalan.xsltc.compiler.Stylesheet.parseContents(Stylesheet.java:559)
       at org.apache.xalan.xsltc.compiler.Parser.createAST(Parser.java:383)
       at org.apache.xalan.xsltc.compiler.XSLTC.compile(XSLTC.java:361)
       at org.apache.xalan.xsltc.compiler.XSLTC.compile(XSLTC.java:446)
       at org.apache.xalan.xsltc.trax.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:799)
       at ru.sbtc.util.StylesheetManager.loadTemplates(StylesheetManager.java:174)
       at ru.sbtc.util.StylesheetManager.getTransformer(StylesheetManager.java:161)
       - locked <0x57067f10> (a ru.sbtc.util.StylesheetManager)
       at ru.sbtc.sitebuilder.servlet.XMLServlet.doGet(XMLServlet.java:193)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:114)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:91)
...
"http--8123-29$31079116":
       at java.lang.ClassLoader.defineClass1(Native Method)
       at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
       at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
       at com.caucho.loader.DynamicClassLoader.loadClass(DynamicClassLoader.java:1523)
       - locked <0x5d3fea48> (a com.caucho.loader.ClassEntry)
       at com.caucho.loader.DynamicClassLoader.findClassImpl(DynamicClassLoader.java:1390)
       at com.caucho.loader.DynamicClassLoader.loadClassImpl(DynamicClassLoader.java:1289)
       at com.caucho.loader.SystemClassLoader.loadClassImpl(SystemClassLoader.java:217)
       at com.caucho.loader.DynamicClassLoader.loadClassImpl(DynamicClassLoader.java:1279)
       at com.caucho.loader.DynamicClassLoader.loadClassImpl(DynamicClassLoader.java:1279)
       at com.caucho.loader.DynamicClassLoader.loadClassImpl(DynamicClassLoader.java:1279)
       at com.caucho.loader.DynamicClassLoader.loadClass(DynamicClassLoader.java:1219)
       at com.caucho.loader.DynamicClassLoader.loadClass(DynamicClassLoader.java:1203)
       at org.apache.xalan.xsltc.compiler.ObjectFactory.findProviderClass(ObjectFactory.java:508)
       at org.apache.xalan.xsltc.compiler.Parser.makeInstance(Parser.java:919)
       at org.apache.xalan.xsltc.compiler.Parser.startElement(Parser.java:1243)
       at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
       at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
       at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
       at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
       at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
       at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
       at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
       at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
       at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
       at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
       at org.apache.xalan.xsltc.compiler.Parser.parse(Parser.java:415)
       at org.apache.xalan.xsltc.compiler.Parser.parse(Parser.java:467)
       at org.apache.xalan.xsltc.compiler.Import.parseContents(Import.java:99)
       at org.apache.xalan.xsltc.compiler.Stylesheet.parseOwnChildren(Stylesheet.java:587)
       at org.apache.xalan.xsltc.compiler.Stylesheet.parseContents(Stylesheet.java:559)
       at org.apache.xalan.xsltc.compiler.Parser.createAST(Parser.java:383)
       at org.apache.xalan.xsltc.compiler.XSLTC.compile(XSLTC.java:361)
       at org.apache.xalan.xsltc.compiler.XSLTC.compile(XSLTC.java:446)
       at org.apache.xalan.xsltc.trax.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:799)
       at ru.sbtc.util.StylesheetManager.loadTemplates(StylesheetManager.java:174)
       at ru.sbtc.util.StylesheetManager.getTransformer(StylesheetManager.java:161)
       - locked <0x5600ca80> (a ru.sbtc.util.StylesheetManager)
       at ru.sbtc.sitebuilder.InfoBlock.output(InfoBlock.java:2025)
       at ru.sbtc.sitebuilder.SectionToXML.process(SectionToXML.java:332)
       at ru.sbtc.sitebuilder.servlet.XMLServlet.doGet(XMLServlet.java:214)
...

Found 1 deadlock.

Steps To Reproduce

Additional Information

Attached Files

Relationships

Notes
(0003943) stbu 03-27-09 12:42	Scott, could this be related to the deadlock issue during JSP Precompile that I've reported at bug 3220 http://bugs.caucho.com/view.php?id=3220 [^]

Issue History
Date Modified	Username	Field	Change
03-27-09 07:11	ferg	New Issue
03-27-09 12:42	stbu	Note Added: 0003943
03-27-09 12:43	stbu	Issue Monitored: stbu
05-07-09 13:16	ferg	Assigned To	=> ferg
05-07-09 13:16	ferg	Status	new => closed
05-07-09 13:16	ferg	Resolution	open => fixed
05-07-09 13:16	ferg	Fixed in Version	=> 4.0.1
05-07-09 13:16	ferg	Description Updated

Mantis 1.0.0rc3[^]

31 total queries executed.
26 unique queries executed.