javac fails to build jsr166 sources, it cannot find -addmod java.corba and crashes with a completion error.
error: cannot find module: java.corba
/JSR166/jdk9/jdk/src/java.base/share/classes/module-info.java:128: error: module not found: java.corba
        java.corba;
            ^
/JSR166/jdk9/jdk/src/java.base/share/classes/module-info.java:164: error: module not found: java.corba
        java.corba,
            ^
/JSR166/jdk9/jdk/src/java.base/share/classes/module-info.java:212: error: module not found: jdk.compiler
        jdk.compiler;
           ^
/JSR166/jdk9/jdk/src/java.base/share/classes/module-info.java:216: error: module not found: java.corba
        java.corba,
            ^
com.sun.tools.javac.code.Symbol$CompletionFailure: cannot resolve modules
at com.sun.tools.javac.main.JavaCompiler.readSourceFile(jdk.compiler@9-internal/JavaCompiler.java:817)
at com.sun.tools.javac.main.JavaCompiler.readSourceFile(jdk.compiler@9-internal/JavaCompiler.java:778)
at com.sun.tools.javac.main.JavaCompiler.access$100(jdk.compiler@9-internal/JavaCompiler.java:97)
at com.sun.tools.javac.main.JavaCompiler$1.complete(jdk.compiler@9-internal/JavaCompiler.java:339)
at com.sun.tools.javac.code.ClassFinder.fillIn(jdk.compiler@9-internal/ClassFinder.java:362)
at com.sun.tools.javac.code.ModuleFinder$1.complete(jdk.compiler@9-internal/ModuleFinder.java:311)
at com.sun.tools.javac.code.Symbol.complete(jdk.compiler@9-internal/Symbol.java:602)
at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(jdk.compiler@9-internal/Symbol.java:1219)
at com.sun.tools.javac.comp.Modules$2.complete(jdk.compiler@9-internal/Modules.java:456)
at com.sun.tools.javac.code.Symtab.lambda$new$0(jdk.compiler@9-internal/Symtab.java:568)
at com.sun.tools.javac.code.Symbol.complete(jdk.compiler@9-internal/Symbol.java:602)
at com.sun.tools.javac.comp.Modules$4.complete(jdk.compiler@9-internal/Modules.java:928)
at com.sun.tools.javac.code.Symbol.complete(jdk.compiler@9-internal/Symbol.java:602)
at jdk.javadoc.internal.tool.JavadocTool.getEnvironment(jdk.javadoc@9-internal/JavadocTool.java:192)
at jdk.javadoc.internal.tool.Start.parseAndExecute(jdk.javadoc@9-internal/Start.java:403)
at jdk.javadoc.internal.tool.Start.begin(jdk.javadoc@9-internal/Start.java:276)
at jdk.javadoc.internal.tool.Start.begin(jdk.javadoc@9-internal/Start.java:222)
at jdk.javadoc.internal.tool.Main.execute(jdk.javadoc@9-internal/Main.java:70)
at jdk.javadoc.internal.tool.Main.main(jdk.javadoc@9-internal/Main.java:52)
javadoc: error - fatal exception
6 errors