Program: 31406
Project: 31406
Buggy source:
private void process(IOContext context,final ChannelStatus status){
  final Request r=context.request;
  final SimpleResponse sr=context.simpleResponse();
  ChannelStatus result;
  try {
    boolean log=r.isIncomplete();
    if (status == ChannelStatus.READ) {
      r.read();
    }
    if (r.getUrl() == null) {
      sr.send(400);
    }
 else {
      ContextHandler handler=urlMatcher.get(r.getUrl());
      if (handler != null) {
switch (status) {
case WRITE:
          context.resume();
        handler.resume(context);
      break;
case READ:
    if (r.isMultipart()) {
      if (handler instanceof MultipartListener) {
        r.parseMultipart(context,(MultipartListener)handler);
        handler.handle(context);
      }
 else {
        sr.send(400);
      }
    }
 else {
      if (handler instanceof MultipartListener) {
        sr.send(400);
      }
 else {
        handler.handle(context);
      }
    }
  break;
default :
LOG.error().$("String_Node_Str").$(status).$();
break;
}
}
 else {
sr.send(404);
}
if (log && !r.isIncomplete()) {
ACCESS.xinfo().$ip(Net.getPeerIP(context.channel.getFd())).$("String_Node_Str").$("String_Node_Str").$("String_Node_Str").$ts(System.currentTimeMillis()).$("String_Node_Str").$('"').$(r.getMethodLine()).$('"').$(' ').$(context.getResponseCode()).$(' ').$(context.channel.getTotalWrittenAndReset()).$();
}
}
context.clear();
result=ChannelStatus.READ;
}
 catch (HeadersTooLargeException ignored) {
silent(sr,431,null);
LOG.info().$("String_Node_Str").$();
result=ChannelStatus.READ;
}
catch (MalformedHeaderException|DisconnectedChannelException e) {
result=ChannelStatus.DISCONNECTED;
}
catch (EndOfChannelException e) {
result=ChannelStatus.EOF;
}
catch (SlowReadableChannelException e) {
LOG.debug().$("String_Node_Str").$();
result=ChannelStatus.READ;
}
catch (SlowWritableChannelException e) {
LOG.debug().$("String_Node_Str").$();
result=ChannelStatus.WRITE;
}
catch (IOException e) {
result=ChannelStatus.DISCONNECTED;
LOG.error().$("String_Node_Str").$(e).$();
}
catch (Throwable e) {
silent(sr,500,e.getMessage());
result=ChannelStatus.DISCONNECTED;
LOG.error().$("String_Node_Str").$(e).$();
}
ioDispatcher.registerChannel(context,result);
}

Fixed version (ground truth):
private void process(IOContext context,final ChannelStatus status){
  final Request r=context.request;
  final SimpleResponse sr=context.simpleResponse();
  ChannelStatus result;
  try {
    boolean log=r.isIncomplete();
    if (status == ChannelStatus.READ) {
      r.read();
    }
    if (r.getUrl() == null) {
      sr.send(400);
    }
 else {
      ContextHandler handler=urlMatcher.get(r.getUrl());
      if (handler != null) {
switch (status) {
case WRITE:
          context.resume();
        handler.resume(context);
      break;
case READ:
    if (r.isMultipart()) {
      if (handler instanceof MultipartListener) {
        r.parseMultipart(context,(MultipartListener)handler);
        handler.handle(context);
      }
 else {
        sr.send(400);
      }
    }
 else {
      if (handler instanceof MultipartListener) {
        sr.send(400);
      }
 else {
        handler.handle(context);
      }
    }
  break;
default :
LOG.error().$("String_Node_Str").$(status).$();
break;
}
}
 else {
sr.send(404);
}
if (log && !r.isIncomplete()) {
logAccess(context);
}
}
context.clear();
result=ChannelStatus.READ;
}
 catch (HeadersTooLargeException ignored) {
silent(sr,431,null);
LOG.info().$("String_Node_Str").$();
logAccess(context);
result=ChannelStatus.READ;
}
catch (MalformedHeaderException|DisconnectedChannelException e) {
result=ChannelStatus.DISCONNECTED;
}
catch (EndOfChannelException e) {
result=ChannelStatus.EOF;
}
catch (SlowReadableChannelException e) {
LOG.debug().$("String_Node_Str").$();
result=ChannelStatus.READ;
}
catch (SlowWritableChannelException e) {
LOG.debug().$("String_Node_Str").$();
result=ChannelStatus.WRITE;
}
catch (Throwable e) {
silent(sr,500,e.getMessage());
result=ChannelStatus.DISCONNECTED;
LOG.error().$("String_Node_Str").$(e).$();
logAccess(context);
}
ioDispatcher.registerChannel(context,result);
}