FULL PRODUCT VERSION :
Icedtea interpreted mode (openjdk 1.6.0_20)

ADDITIONAL OS VERSION INFORMATION :
Linux server02 2.6.15 #148 SMP Thu Sep 16 14:27:28 CST 2010 alpha GNU/Linux

A DESCRIPTION OF THE PROBLEM :
root [ bin ]# cat Hello.java
public class Hello {
        public static void main(String[] args)
        {
                System.out.println("Hello World.");
        }
}
root [ bin ]# ./javac Hello.java
An exception has occurred in the compiler (1.6.0_20). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.IllegalMonitorStateException
        at java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(ReentrantLock.java:155)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(AbstractQueuedSynchronizer.java:1262)
        at java.util.concurrent.locks.ReentrantLock.unlock(ReentrantLock.java:459)
        at com.sun.tools.javac.zip.ZipFileIndex.getZipFileIndex(ZipFileIndex.java:145)
        at com.sun.tools.javac.util.JavacFileManager.openArchive(JavacFileManager.java:653)
        at com.sun.tools.javac.util.JavacFileManager.listDirectory(JavacFileManager.java:342)
        at com.sun.tools.javac.util.JavacFileManager.list(JavacFileManager.java:926)
        at com.sun.tools.javac.jvm.ClassReader.fillIn(ClassReader.java:2092)
        at com.sun.tools.javac.jvm.ClassReader.complete(ClassReader.java:1795)
        at com.sun.tools.javac.code.Symbol.complete(Symbol.java:400)
        at com.sun.tools.javac.comp.Enter.visitTopLevel(Enter.java:291)
        at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:454)
        at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:252)
        at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:266)
        at com.sun.tools.javac.comp.Enter.complete(Enter.java:474)
        at com.sun.tools.javac.comp.Enter.main(Enter.java:459)
        at com.sun.tools.javac.main.JavaCompiler.enterTrees(JavaCompiler.java:895)
        at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:797)
        at com.sun.tools.javac.main.Main.compile(Main.java:380)
        at com.sun.tools.javac.main.Main.compile(Main.java:306)
        at com.sun.tools.javac.main.Main.compile(Main.java:297)
        at com.sun.tools.javac.Main.compile(Main.java:82)
        at com.sun.tools.javac.Main.main(Main.java:67)


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
get 'Hello.class' from 'Hello.java' by 'jvac'
ACTUAL -
An exception has occurred in the compiler (1.6.0_20).

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
An exception has occurred in the compiler (1.6.0_20). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.IllegalMonitorStateException
        at java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(ReentrantLock.java:155)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(AbstractQueuedSynchronizer.java:1262)
        at java.util.concurrent.locks.ReentrantLock.unlock(ReentrantLock.java:459)
        at com.sun.tools.javac.zip.ZipFileIndex.getZipFileIndex(ZipFileIndex.java:145)
        at com.sun.tools.javac.util.JavacFileManager.openArchive(JavacFileManager.java:653)
        at com.sun.tools.javac.util.JavacFileManager.listDirectory(JavacFileManager.java:342)
        at com.sun.tools.javac.util.JavacFileManager.list(JavacFileManager.java:926)
        at com.sun.tools.javac.jvm.ClassReader.fillIn(ClassReader.java:2092)
        at com.sun.tools.javac.jvm.ClassReader.complete(ClassReader.java:1795)
        at com.sun.tools.javac.code.Symbol.complete(Symbol.java:400)
        at com.sun.tools.javac.comp.Enter.visitTopLevel(Enter.java:291)
        at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:454)
        at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:252)
        at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:266)
        at com.sun.tools.javac.comp.Enter.complete(Enter.java:474)
        at com.sun.tools.javac.comp.Enter.main(Enter.java:459)
        at com.sun.tools.javac.main.JavaCompiler.enterTrees(JavaCompiler.java:895)
        at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:797)
        at com.sun.tools.javac.main.Main.compile(Main.java:380)
        at com.sun.tools.javac.main.Main.compile(Main.java:306)
        at com.sun.tools.javac.main.Main.compile(Main.java:297)
        at com.sun.tools.javac.Main.compile(Main.java:82)
        at com.sun.tools.javac.Main.main(Main.java:67)

---------- END SOURCE ----------

SUPPORT :
YES