Program: 135843
Project: 135843
Buggy source:
/** 
 * Decode an EthernetPacket into an Ipv4Packet
 */
@Override public Ipv6PacketReceived decode(EthernetPacketReceived ethernetPacketReceived){
  Ipv6PacketReceivedBuilder ipv6ReceivedBuilder=new Ipv6PacketReceivedBuilder();
  List<PacketChain> packetChainList=ethernetPacketReceived.getPacketChain();
  EthernetPacket ethernetPacket=(EthernetPacket)packetChainList.get(packetChainList.size() - 1).getPacket();
  int bitOffset=ethernetPacket.getPayloadOffset() * NetUtils.NumBitsInAByte;
  byte[] data=ethernetPacketReceived.getPayload();
  Ipv6PacketBuilder builder=new Ipv6PacketBuilder();
  try {
    builder.setVersion(BitBufferHelper.getShort(BitBufferHelper.getBits(data,bitOffset,4)));
    if (builder.getVersion().intValue() != 6) {
      _logger.debug("String_Node_Str" + builder.getVersion());
    }
    builder.setDscp(new Dscp(BitBufferHelper.getShort(BitBufferHelper.getBits(data,bitOffset + 4,6))));
    builder.setEcn(BitBufferHelper.getShort(BitBufferHelper.getBits(data,bitOffset + 10,2)));
    builder.setFlowLabel(BitBufferHelper.getLong(BitBufferHelper.getBits(data,bitOffset + 12,20)));
    builder.setIpv6Length(BitBufferHelper.getInt(BitBufferHelper.getBits(data,bitOffset + 32,16)));
    builder.setNextHeader(KnownIpProtocols.forValue(BitBufferHelper.getInt(BitBufferHelper.getBits(data,bitOffset + 48,8))));
    builder.setHopLimit(BitBufferHelper.getShort(BitBufferHelper.getBits(data,bitOffset + 56,8)));
    builder.setSourceIpv6(Ipv6Address.getDefaultInstance(InetAddress.getByAddress(BitBufferHelper.getBits(data,bitOffset + 64,128)).getHostAddress()));
    builder.setDestinationIpv6(Ipv6Address.getDefaultInstance(InetAddress.getByAddress(BitBufferHelper.getBits(data,bitOffset + 192,128)).getHostAddress()));
    List<ExtensionHeaders> extensionHeaders=new ArrayList<ExtensionHeaders>();
    int extraHeaderBits=0;
    while (builder.getNextHeader() != null && !builder.getNextHeader().equals(KnownIpProtocols.Tcp) && !builder.getNextHeader().equals(KnownIpProtocols.Udp)) {
      int octetLength=BitBufferHelper.getInt(BitBufferHelper.getBits(data,328 + extraHeaderBits + bitOffset,8));
      int start=(336 + extraHeaderBits + bitOffset) / NetUtils.NumBitsInAByte;
      int end=start + 6 + octetLength;
      extensionHeaders.add(new ExtensionHeadersBuilder().setType(builder.getNextHeader()).setLength(octetLength).setData(Arrays.copyOfRange(data,start,end)).build());
      builder.setNextHeader(KnownIpProtocols.forValue(BitBufferHelper.getShort(BitBufferHelper.getBits(data,320 + extraHeaderBits + bitOffset,8))));
      extraHeaderBits+=64 + octetLength * NetUtils.NumBitsInAByte;
    }
    if (!extensionHeaders.isEmpty()) {
      builder.setExtensionHeaders(extensionHeaders);
    }
    int start=(320 + extraHeaderBits + bitOffset) / NetUtils.NumBitsInAByte;
    int end=data.length - 4;
    builder.setPayloadOffset(start);
    builder.setPayloadLength(end - start);
  }
 catch (  BufferException|UnknownHostException e) {
    _logger.debug("String_Node_Str",e.getMessage());
  }
  packetChainList.add(new PacketChainBuilder().setPacket(builder.build()).build());
  ipv6ReceivedBuilder.setPacketChain(packetChainList);
  ipv6ReceivedBuilder.setPayload(ethernetPacketReceived.getPayload());
  return ipv6ReceivedBuilder.build();
}

Fixed version (ground truth):
/** 
 * Decode an EthernetPacket into an Ipv4Packet
 */
@Override public Ipv6PacketReceived decode(EthernetPacketReceived ethernetPacketReceived){
  Ipv6PacketReceivedBuilder ipv6ReceivedBuilder=new Ipv6PacketReceivedBuilder();
  List<PacketChain> packetChainList=ethernetPacketReceived.getPacketChain();
  EthernetPacket ethernetPacket=(EthernetPacket)packetChainList.get(packetChainList.size() - 1).getPacket();
  int bitOffset=ethernetPacket.getPayloadOffset() * NetUtils.NumBitsInAByte;
  byte[] data=ethernetPacketReceived.getPayload();
  Ipv6PacketBuilder builder=new Ipv6PacketBuilder();
  try {
    builder.setVersion(BitBufferHelper.getShort(BitBufferHelper.getBits(data,bitOffset,4)));
    if (builder.getVersion().intValue() != 6) {
      _logger.debug("String_Node_Str" + builder.getVersion());
    }
    builder.setDscp(new Dscp(BitBufferHelper.getShort(BitBufferHelper.getBits(data,bitOffset + 4,6))));
    builder.setEcn(BitBufferHelper.getShort(BitBufferHelper.getBits(data,bitOffset + 10,2)));
    builder.setFlowLabel(BitBufferHelper.getLong(BitBufferHelper.getBits(data,bitOffset + 12,20)));
    builder.setIpv6Length(BitBufferHelper.getInt(BitBufferHelper.getBits(data,bitOffset + 32,16)));
    builder.setNextHeader(KnownIpProtocols.forValue(BitBufferHelper.getInt(BitBufferHelper.getBits(data,bitOffset + 48,8))));
    builder.setHopLimit(BitBufferHelper.getShort(BitBufferHelper.getBits(data,bitOffset + 56,8)));
    builder.setSourceIpv6(Ipv6Address.getDefaultInstance(InetAddress.getByAddress(BitBufferHelper.getBits(data,bitOffset + 64,128)).getHostAddress()));
    builder.setDestinationIpv6(Ipv6Address.getDefaultInstance(InetAddress.getByAddress(BitBufferHelper.getBits(data,bitOffset + 192,128)).getHostAddress()));
    builder.setPayloadOffset((320 + bitOffset) / NetUtils.NumBitsInAByte);
    builder.setPayloadLength(builder.getIpv6Length());
    List<ExtensionHeaders> extensionHeaders=new ArrayList<ExtensionHeaders>();
    KnownIpProtocols nextHeader=builder.getNextHeader();
    int extHeaderOffset=0;
    while (nextHeader != null && !nextHeader.equals(KnownIpProtocols.Tcp) && !nextHeader.equals(KnownIpProtocols.Udp)) {
      short nextHeaderType=BitBufferHelper.getShort(BitBufferHelper.getBits(data,320 + extHeaderOffset + bitOffset,8));
      nextHeader=KnownIpProtocols.forValue(nextHeaderType);
      int octetLength=BitBufferHelper.getInt(BitBufferHelper.getBits(data,328 + extHeaderOffset + bitOffset,8));
      int start=(336 + extHeaderOffset + bitOffset) / NetUtils.NumBitsInAByte;
      int end=start + 6 + octetLength;
      extensionHeaders.add(new ExtensionHeadersBuilder().setNextHeader(nextHeader).setLength(octetLength).setData(Arrays.copyOfRange(data,start,end)).build());
      extHeaderOffset+=64 + octetLength * NetUtils.NumBitsInAByte;
    }
    if (!extensionHeaders.isEmpty()) {
      builder.setExtensionHeaders(extensionHeaders);
    }
  }
 catch (  BufferException|UnknownHostException e) {
    _logger.debug("String_Node_Str",e.getMessage());
  }
  packetChainList.add(new PacketChainBuilder().setPacket(builder.build()).build());
  ipv6ReceivedBuilder.setPacketChain(packetChainList);
  ipv6ReceivedBuilder.setPayload(ethernetPacketReceived.getPayload());
  return ipv6ReceivedBuilder.build();
}