Program: 54803
Project: 54803
Buggy source:
private static void logLevel(){
  DEBUG="String_Node_Str".equalsIgnoreCase(System.getProperty("String_Node_Str","String_Node_Str"));
  TRACE="String_Node_Str".equalsIgnoreCase(System.getProperty("String_Node_Str","String_Node_Str"));
  if (TRACE) {
    DEBUG=true;
    Module.setModuleLogger(new ModuleLogger(){
      @Override public void trace(      final Throwable t,      final String format,      final Object arg1,      final Object arg2,      final Object arg3){
        Main.trace(format,arg1,arg2,arg3,t);
      }
      @Override public void trace(      final Throwable t,      final String format,      final Object arg1,      final Object arg2){
        Main.trace(format,arg1,arg2,t);
      }
      @Override public void trace(      final String format,      final Object arg1,      final Object arg2,      final Object arg3){
        Main.trace(format,arg1,arg2,arg3);
      }
      @Override public void trace(      final Throwable t,      final String format,      final Object... args){
        Object[] values=new Object[args.length + 1];
        System.arraycopy(args,0,values,0,args.length);
        values[values.length - 1]=t;
        Main.trace(format,values);
      }
      @Override public void trace(      final Throwable t,      final String format,      final Object arg1){
        Main.trace(format,arg1,t);
      }
      @Override public void trace(      final String format,      final Object arg1,      final Object arg2){
        Main.trace(format,arg1,arg2);
      }
      @Override public void trace(      final Throwable t,      final String message){
        Main.trace(message,t);
      }
      @Override public void trace(      final String format,      final Object... args){
        Main.trace(format,args);
      }
      @Override public void trace(      final String format,      final Object arg1){
        Main.trace(format,arg1);
      }
      @Override public void trace(      final String message){
        Main.trace(message);
      }
      @Override public void providerUnloadable(      final String name,      final ClassLoader loader){
      }
      @Override public void moduleDefined(      final ModuleIdentifier identifier,      final ModuleLoader moduleLoader){
      }
      @Override public void greeting(){
      }
      @Override public void classDefined(      final String name,      final Module module){
      }
      @Override public void classDefineFailed(      final Throwable throwable,      final String className,      final Module module){
      }
    }
);
  }
}

Fixed version (ground truth):
private static void logLevel(){
  DEBUG="String_Node_Str".equalsIgnoreCase(System.getProperty("String_Node_Str","String_Node_Str"));
  TRACE="String_Node_Str".equalsIgnoreCase(System.getProperty("String_Node_Str","String_Node_Str"));
  if (TRACE) {
    DEBUG=true;
    Module.setModuleLogger(new ModuleLogger(){
      @Override public void trace(      final Throwable t,      final String format,      final Object arg1,      final Object arg2,      final Object arg3){
        Main.trace(format,arg1,arg2,arg3,t);
      }
      @Override public void trace(      final Throwable t,      final String format,      final Object arg1,      final Object arg2){
        Main.trace(format,arg1,arg2,t);
      }
      @Override public void trace(      final String format,      final Object arg1,      final Object arg2,      final Object arg3){
        Main.trace(format,arg1,arg2,arg3);
      }
      @Override public void trace(      final Throwable t,      final String format,      final Object... args){
        Object[] values=new Object[args.length + 1];
        System.arraycopy(args,0,values,0,args.length);
        values[values.length - 1]=t;
        Main.trace(format,values);
      }
      @Override public void trace(      final Throwable t,      final String format,      final Object arg1){
        Main.trace(format,arg1,t);
      }
      @Override public void trace(      final String format,      final Object arg1,      final Object arg2){
        Main.trace(format,arg1,arg2);
      }
      @Override public void trace(      final Throwable t,      final String message){
        Main.trace(message,t);
      }
      @Override public void trace(      final String format,      final Object... args){
        Main.trace(format,args);
      }
      @Override public void trace(      final String format,      final Object arg1){
        Main.trace(format,arg1);
      }
      @Override public void trace(      final String message){
        Main.trace(message);
      }
      @Override public void providerUnloadable(      final String name,      final ClassLoader loader){
      }
      @Override public void moduleDefined(      final ModuleIdentifier identifier,      final ModuleLoader moduleLoader){
      }
      @Override public void greeting(){
      }
      @Override public void classDefined(      final String name,      final Module module){
      }
      @Override public void classDefineFailed(      final Throwable throwable,      final String className,      final Module module){
      }
    }
);
  }
  String logback=Optional.ofNullable(System.getProperty("String_Node_Str")).orElseGet(() -> Arrays.asList(Paths.get("String_Node_Str","String_Node_Str"),Paths.get("String_Node_Str","String_Node_Str")).stream().filter(p -> p.toFile().exists()).map(Path::toString).findFirst().orElse(Paths.get("String_Node_Str","String_Node_Str").toString()));
  debug("String_Node_Str",logback);
  System.setProperty("String_Node_Str",logback);
}