Program: 14885
Project: 14885
Buggy source:
@Override public SetResponse findRecords(Name name,int type){
  if (name.toString().matches("String_Node_Str")) {
    try {
      String[] tryIp=name.toString().replaceAll("String_Node_Str","String_Node_Str").replaceAll("String_Node_Str","String_Node_Str").split("String_Node_Str");
      if (tryIp.length < 4)       return super.findRecords(name,type);
      String ipCandidate=new StringBuffer().append(tryIp[0]).append("String_Node_Str").append(tryIp[1]).append("String_Node_Str").append(tryIp[2]).append("String_Node_Str").append(tryIp[3]).toString();
      try {
        VmInstances.lookupByPublicIp(ipCandidate);
      }
 catch (      Exception e) {
        try {
          VmInstances.lookupByInstanceIp(ipCandidate);
        }
 catch (        Exception e1) {
          return super.findRecords(name,type);
        }
      }
      InetAddress ip=InetAddress.getByName(ipCandidate);
      SetResponse resp=new SetResponse(SetResponse.SUCCESSFUL);
      resp.addRRset(new RRset(new ARecord(name,1,ttl,ip)));
      return resp;
    }
 catch (    Exception e) {
      return super.findRecords(name,type);
    }
  }
 else   if (name.toString().endsWith("String_Node_Str")) {
    int index=name.toString().indexOf("String_Node_Str");
    Name target;
    if (index > 0) {
      String ipString=name.toString().substring(0,index);
      String[] parts=ipString.split("String_Node_Str");
      String ipCandidate;
      if (parts.length == 4) {
        ipCandidate=new StringBuffer().append(parts[3]).append("String_Node_Str").append(parts[2]).append("String_Node_Str").append(parts[1]).append("String_Node_Str").append(parts[0]).toString();
      }
 else {
        return super.findRecords(name,type);
      }
      try {
        VmInstance instance=VmInstances.lookupByPublicIp(ipCandidate);
        target=new Name(instance.getPublicDnsName() + "String_Node_Str");
      }
 catch (      Exception e) {
        try {
          VmInstance instance=VmInstances.lookupByInstanceIp(ipCandidate);
          target=new Name(instance.getPrivateDnsName() + "String_Node_Str");
        }
 catch (        Exception e1) {
          return super.findRecords(name,type);
        }
      }
      SetResponse resp=new SetResponse(SetResponse.SUCCESSFUL);
      resp.addRRset(new RRset(new PTRRecord(name,DClass.IN,ttl,target)));
      return resp;
    }
 else {
      return super.findRecords(name,type);
    }
  }
 else {
    return super.findRecords(name,type);
  }
}

Fixed version (ground truth):
@Override public SetResponse findRecords(Name name,int type){
  if (name.toString().matches("String_Node_Str")) {
    try {
      String[] tryIp=name.toString().replaceAll("String_Node_Str","String_Node_Str").replaceAll("String_Node_Str","String_Node_Str").split("String_Node_Str");
      if (tryIp.length < 4)       return super.findRecords(name,type);
      String ipCandidate=new StringBuffer().append(tryIp[0]).append("String_Node_Str").append(tryIp[1]).append("String_Node_Str").append(tryIp[2]).append("String_Node_Str").append(tryIp[3]).toString();
      try {
        VmInstances.lookupByPublicIp(ipCandidate);
      }
 catch (      Exception e) {
        try {
          VmInstances.lookupByPrivateIp(ipCandidate);
        }
 catch (        Exception e1) {
          return super.findRecords(name,type);
        }
      }
      InetAddress ip=InetAddress.getByName(ipCandidate);
      SetResponse resp=new SetResponse(SetResponse.SUCCESSFUL);
      resp.addRRset(new RRset(new ARecord(name,1,ttl,ip)));
      return resp;
    }
 catch (    Exception e) {
      return super.findRecords(name,type);
    }
  }
 else   if (name.toString().endsWith("String_Node_Str")) {
    int index=name.toString().indexOf("String_Node_Str");
    Name target;
    if (index > 0) {
      String ipString=name.toString().substring(0,index);
      String[] parts=ipString.split("String_Node_Str");
      String ipCandidate;
      if (parts.length == 4) {
        ipCandidate=new StringBuffer().append(parts[3]).append("String_Node_Str").append(parts[2]).append("String_Node_Str").append(parts[1]).append("String_Node_Str").append(parts[0]).toString();
      }
 else {
        return super.findRecords(name,type);
      }
      try {
        VmInstance instance=VmInstances.lookupByPublicIp(ipCandidate);
        target=new Name(instance.getPublicDnsName() + "String_Node_Str");
      }
 catch (      Exception e) {
        try {
          VmInstance instance=VmInstances.lookupByPrivateIp(ipCandidate);
          target=new Name(instance.getPrivateDnsName() + "String_Node_Str");
        }
 catch (        Exception e1) {
          return super.findRecords(name,type);
        }
      }
      SetResponse resp=new SetResponse(SetResponse.SUCCESSFUL);
      resp.addRRset(new RRset(new PTRRecord(name,DClass.IN,ttl,target)));
      return resp;
    }
 else {
      return super.findRecords(name,type);
    }
  }
 else {
    return super.findRecords(name,type);
  }
}