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Date: Fri, 17 Apr 2009 05:42:15 -0700 (PDT)
From: "Karl Pauls (JIRA)" <jira@apache.org>
To: dev@felix.apache.org
Subject: [jira] Commented: (FELIX-1035) deadlock observed while using
 fileinstall to monitor multiple directories
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    [ https://issues.apache.org/jira/browse/FELIX-1035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12700159#action_12700159 ] 

Karl Pauls commented on FELIX-1035:
-----------------------------------

Ok. I did commit another attempt at fixing this issue. Could you update to trunk and see whether it makes any difference? 

> deadlock observed while using fileinstall to monitor multiple directories
> -------------------------------------------------------------------------
>
>                 Key: FELIX-1035
>                 URL: https://issues.apache.org/jira/browse/FELIX-1035
>             Project: Felix
>          Issue Type: Bug
>          Components: File Install
>    Affects Versions: configadmin-1.0.10
>         Environment: Solaris 10/x86
> java version "1.6.0_07"
> Java(TM) SE Runtime Environment (build 1.6.0_07-b06)
> Java HotSpot(TM) Client VM (build 10.0-b23, mixed mode, sharing)
> fileinstall version #0.9.2
> felix version #1.6.0
>            Reporter: Sahoo
>            Assignee: Karl Pauls
>
> I am using fileinstall to monitor two directories. fileinstall is configured using config.properties file to monitor a dir called modules. Then I have a cfg file in modules dir that configures fileinstall to monitor a second dir called autodeploy-modules. During subsequent start of the framework, I see deadlock like this:
> Found one Java-level deadlock:
> =============================
> "{felix.fileinstall.poll=5000, felix.fileinstall.bundles.new.start=false, felix.fileinstall.dir=/space/ss141213/WS/gf/v3.trunk.new/publish/glassfish/modules/, felix.fileinstall.debug=1}":
>   waiting to lock monitor 0x0851dac8 (object 0xa0518300, a java.net.URLClassLoader),
>   which is held by "Configuration Updater"
> "Configuration Updater":
>   waiting to lock monitor 0x085202a0 (object 0xa050bd68, a sun.misc.Launcher$ExtClassLoader),
>   which is held by "{felix.fileinstall.poll=5000, felix.fileinstall.bundles.new.start=false, felix.fileinstall.dir=/space/ss141213/WS/gf/v3.trunk.new/publish/glassfish/modules/, felix.fileinstall.debug=1}"
> Java stack information for the threads listed above:
> ===================================================
> "{felix.fileinstall.poll=5000, felix.fileinstall.bundles.new.start=false, felix.fileinstall.dir=/space/ss141213/WS/gf/v3.trunk.new/publish/glassfish/modules/, felix.fileinstall.debug=1}":
>         at java.lang.Class.forName0(Native Method)
>         at java.lang.Class.forName(Class.java:169)
>         at org.apache.felix.framework.URLHandlersStreamHandlerProxy.class$(URLHandlersStreamHandlerProxy.java:75)
>         at org.apache.felix.framework.URLHandlersStreamHandlerProxy.getStreamHandlerService(URLHandlersStreamHandlerProxy.java:438)
>         at org.apache.felix.framework.URLHandlersStreamHandlerProxy.parseURL(URLHandlersStreamHandlerProxy.java:297)
>         at java.net.URL.<init>(URL.java:596)
>         at java.net.URL.<init>(URL.java:464)
>         at java.net.URL.<init>(URL.java:413)
>         at java.net.JarURLConnection.parseSpecs(JarURLConnection.java:161)
>         at java.net.JarURLConnection.<init>(JarURLConnection.java:144)
>         at sun.net.www.protocol.jar.JarURLConnection.<init>(JarURLConnection.java:63)
>         at sun.net.www.protocol.jar.Handler.openConnection(Handler.java:24)
>         at java.net.URL.openConnection(URL.java:945)
>         at java.net.URL.openStream(URL.java:1009)
>         at java.lang.ClassLoader.getSystemResourceAsStream(ClassLoader.java:1183)
>         at java.lang.Class.getResourceAsStream(Class.java:2028)
>         at sun.text.normalizer.ICUData.getStream(ICUData.java:43)
>         at sun.text.normalizer.ICUData.getRequiredStream(ICUData.java:63)
>         at sun.text.normalizer.NormalizerImpl.<init>(NormalizerImpl.java:243)
>         at sun.text.normalizer.NormalizerImpl.<clinit>(NormalizerImpl.java:40)
>         at sun.text.normalizer.NormalizerBase.decompose(NormalizerBase.java:707)
>         at sun.text.normalizer.NormalizerBase$NFKDMode.normalize(NormalizerBase.java:348)
>         at sun.text.normalizer.NormalizerBase.normalize(NormalizerBase.java:1592)
>         at sun.text.normalizer.NormalizerBase.normalize(NormalizerBase.java:1573)
>         at java.text.Normalizer.normalize(Normalizer.java:146)
>         at sun.security.x509.AVA.toRFC2253CanonicalString(AVA.java:986)
>         at sun.security.x509.RDN.toRFC2253StringInternal(RDN.java:430)
>         at sun.security.x509.RDN.toRFC2253String(RDN.java:409)
>         at sun.security.x509.X500Name.getRFC2253CanonicalName(X500Name.java:714)
>         at sun.security.x509.X500Name.equals(X500Name.java:400)
>         at sun.security.pkcs.PKCS7.getCertificate(PKCS7.java:609)
>         at sun.security.pkcs.SignerInfo.getCertificate(SignerInfo.java:202)
>         at sun.security.pkcs.SignerInfo.verify(SignerInfo.java:328)
>         at sun.security.pkcs.PKCS7.verify(PKCS7.java:494)
>         at sun.security.pkcs.PKCS7.verify(PKCS7.java:511)
>         at sun.security.util.SignatureFileVerifier.processImpl(SignatureFileVerifier.java:199)
>         at sun.security.util.SignatureFileVerifier.process(SignatureFileVerifier.java:176)
>         at java.util.jar.JarVerifier.processEntry(JarVerifier.java:277)
>         at java.util.jar.JarVerifier.update(JarVerifier.java:188)
>         at java.util.jar.JarFile.initializeVerifier(JarFile.java:321)
>         at java.util.jar.JarFile.getInputStream(JarFile.java:386)
>         - locked <0xa00f2c60> (a java.util.jar.JarFile)
>         at sun.misc.URLClassPath$JarLoader$2.getInputStream(URLClassPath.java:689)
>         at sun.misc.Resource.cachedInputStream(Resource.java:59)
>         - locked <0xa00f3530> (a sun.misc.URLClassPath$JarLoader$2)
>         at sun.misc.Resource.getByteBuffer(Resource.java:154)
>         at java.net.URLClassLoader.defineClass(URLClassLoader.java:249)
>         at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
>         at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
>         - locked <0xa050bd68> (a sun.misc.Launcher$ExtClassLoader)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
>         - locked <0xa05078d8> (a sun.misc.Launcher$AppClassLoader)
>         at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
>         - locked <0xa05078d8> (a sun.misc.Launcher$AppClassLoader)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
>         at sun.security.jca.ProviderConfig$3.run(ProviderConfig.java:234)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at sun.security.jca.ProviderConfig.doLoadProvider(ProviderConfig.java:225)
>         at sun.security.jca.ProviderConfig.getProvider(ProviderConfig.java:205)
>         - locked <0xa05078d8> (a sun.misc.Launcher$AppClassLoader)
>         at sun.security.jca.ProviderList.getProvider(ProviderList.java:215)
>         at sun.security.jca.ProviderList$3.get(ProviderList.java:130)
>         at sun.security.jca.ProviderList$3.get(ProviderList.java:125)
>         at java.util.AbstractList$Itr.next(AbstractList.java:345)
>         at java.security.SecureRandom.getPrngAlgorithm(SecureRandom.java:522)
>         at java.security.SecureRandom.getDefaultPRNG(SecureRandom.java:165)
>         at java.security.SecureRandom.<init>(SecureRandom.java:133)
>         at org.apache.felix.cm.impl.ConfigurationManager.createPid(ConfigurationManager.java:787)
>         at org.apache.felix.cm.impl.ConfigurationManager.createFactoryConfiguration(ConfigurationManager.java:357)
>         at org.apache.felix.cm.impl.ConfigurationAdminImpl.createFactoryConfiguration(ConfigurationAdminImpl.java:85)
>         at org.apache.felix.fileinstall.DirectoryWatcher.getConfiguration(DirectoryWatcher.java:294)
>         at org.apache.felix.fileinstall.DirectoryWatcher.setConfig(DirectoryWatcher.java:232)
>         at org.apache.felix.fileinstall.DirectoryWatcher.doConfigs(DirectoryWatcher.java:162)
>         at org.apache.felix.fileinstall.DirectoryWatcher.run(DirectoryWatcher.java:121)
> "Configuration Updater":
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:295)
>         - waiting to lock <0xa050bd68> (a sun.misc.Launcher$ExtClassLoader)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
>         - locked <0xa0518300> (a java.net.URLClassLoader)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
>         at org.apache.felix.framework.searchpolicy.ModuleImpl.findClassOrResourceByDelegation(ModuleImpl.java:480)
>         at org.apache.felix.framework.searchpolicy.ModuleImpl.access$100(ModuleImpl.java:59)
>         at org.apache.felix.framework.searchpolicy.ModuleImpl$ModuleClassLoader.loadClass(ModuleImpl.java:1434)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
>         at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
>         - locked <0xa0a5ef58> (a org.apache.felix.framework.searchpolicy.ModuleImpl$ModuleClassLoader)
>         at org.apache.felix.cm.impl.ConfigurationManager.getPersistenceManagers(ConfigurationManager.java:568)
>         at org.apache.felix.cm.impl.ConfigurationManager.getFactory(ConfigurationManager.java:677)
>         at org.apache.felix.cm.impl.ConfigurationManager$ManagedServiceFactoryUpdate.run(ConfigurationManager.java:1014)
>         at org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:88)
> Found 1 deadlock.
> I tried to reproduce the issue using a simple program, but I could not. But, I am able to reproduce the issue in my environment, where I use GlassFish application server which runs on Felix and uses fileinstall.
> I understand this deadlock has to do with "deadlock observed in Sun JVM during parallel classloading," given that the threads involved are Felix threads, can we put any workaround in exercised code path to avoid this deadlock?

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