A DESCRIPTION OF THE PROBLEM :
Javac allows invocation of an inherited instance method from a static method, when the method is inherited twice. The first method argument of the static method is treated as the instance to invoke, which can lead to a Javac crash or VerifyError.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the given example.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Javac shouldn't crash or generate an invalid class.
ACTUAL -
With no arguments:

An exception has occurred in the compiler (23-ea). Please file a bug against the Java compiler via the Java bug reporting page (https://bugreport.java.com) after checking the Bug Database (https://bugs.java.com) for duplicates. Include your program, the following diagnostic, and the parameters passed to the Java compiler in your report. Thank you.
java.lang.NullPointerException: Cannot read field "sym" because "this.lvar[0]" is null
        at jdk.compiler/com.sun.tools.javac.jvm.Code.emitop0(Code.java:572)
        at jdk.compiler/com.sun.tools.javac.jvm.Items$SelfItem.load(Items.java:369)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitIdent(Gen.java:2356)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCIdent.accept(JCTree.java:2704)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:859)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitApply(Gen.java:1929)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1857)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:859)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitReturn(Gen.java:1897)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCReturn.accept(JCTree.java:1769)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:588)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:623)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:609)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStats(Gen.java:660)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.internalVisitBlock(Gen.java:1121)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitBlock(Gen.java:1085)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1133)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:588)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:623)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genMethod(Gen.java:949)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitMethodDef(Gen.java:912)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:957)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:588)
        at jdk.compiler/com.sun.tools.javac.jvm.Gen.genClass(Gen.java:2494)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.genCode(JavaCompiler.java:770)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1700)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1668)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:977)
        at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:319)
        at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:178)
        at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:66)
        at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:52)

And with an int argument :

Error: Unable to initialize main class bug.C
Caused by: java.lang.VerifyError: Bad local variable type
Exception Details:
  Location:
    bug/C.test(I)I @0: aload_0
  Reason:
    Type integer (current frame, locals[0]) is not assignable to reference type
  Current Frame:
    bci: @0
    flags: { }
    locals: { integer }
    stack: { }
  Bytecode:
    0000000: 2ab6 000d ac

---------- BEGIN SOURCE ----------
public interface A {
    int op();
}

public abstract class B {
    abstract int op();
}

public abstract class C extends B implements A {
    public static void main(String[] args) {
        test(1);
    }

    public static int test(int x) {
        return op();
    }
}

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

CUSTOMER SUBMITTED WORKAROUND :
Don't attempt to invoke the instance method.

FREQUENCY : always