S-Function Crashes MatLab when "ssSetInpu​tPortRequi​redContigu​ous" is used

Hello everybody,

I try to get used to Simulink C-Code S-Functions and I have done a little test coding. Everything worked, but when I use the "ssSetInputPortRequiredContiguous" MatLab crashes completely. As I have not so deep knowledge of C-Code, perhaps someone can help me?

Here is my code - it only works, when I disable line 15

#define S_FUNCTION_NAME myfunc3_1
#define S_FUNCTION_LEVEL 2
#include <simstruc.h>
#include "math.h"
extern real_T myfunc(real_T x); //external function "myfunc" just calculates the square-root
static void mdlInitializeSizes(SimStruct *S)
{
    ssSetNumSFcnParams(S, 0);  
    ssSetNumContStates(S, 0);   
    ssSetNumDiscStates(S, 0);   
    if (!ssSetNumInputPorts(S, 1)) return;    
    ssSetInputPortWidth(S, 0, 2);              
    ssSetInputPortDirectFeedThrough(S, 0, 1); 
    ssSetInputPortDataType(S, 0, SS_DOUBLE);   
    ssSetInputPortRequiredContiguous(S, 0, true); //<= this is the line, that crashes Matlab!
    ssSetOutputPortWidth(S, 0, 2);         
    ssSetOutputPortVectorDimension(S, 0, 2);
    ssSetOutputPortDataType(S, 0, SS_DOUBLE);  
    ssSetOutputPortWidth(S, 1, 1);             
    ssSetOutputPortDataType(S, 1, SS_DOUBLE);  
    ssSetNumSampleTimes(S, 1);   
}
static void mdlInitializeSampleTimes(SimStruct *S)
{
    ssSetSampleTime(S, 0, INHERITED_SAMPLE_TIME);
    ssSetOffsetTime(S, 0, 0);
}
static void mdlOutputs(SimStruct *S, int tid)
{
    InputRealPtrsType uPtrs = ssGetInputPortRealSignalPtrs(S,0);    
    real_T            *y0    = ssGetOutputPortRealSignal(S,0);
    int_T           width    = ssGetOutputPortWidth(S,0);
    real_T            *y1    = ssGetOutputPortRealSignal(S,1);
    y0[0] = *uPtrs[0];
    y0[1] = *uPtrs[1];
    *y1 = myfunc(*uPtrs[0]);
}
static void mdlTerminate(SimStruct *S)
{
   UNUSED_ARG(S); /* unused input argument */
}
#ifdef  MATLAB_MEX_FILE   
#include "simulink.c"     
#else
#include "cg_sfun.h"       
#endif

When I mexed this and run the Simulink model, where this s-function is implemented, the result is: "Matlab has encountered an internal problem and needs to close". Details:

MATLAB crash <file:C>:\Users\...\AppData\Local\Temp\matlab_crash_dump.5252-1:

------------------------------------------------------------------------ Segmentation violation detected at Thu Jan 23 13:10:15 2014 ------------------------------------------------------------------------

Configuration: Crash Decoding : Disabled Default Encoding: windows-1252 MATLAB Root : C:\Program Files\MATLAB\R2012b MATLAB Version : 8.0.0.783 (R2012b) Operating System: Microsoft Windows 7 Processor ID : x86 Family 6 Model 42 Stepping 7, GenuineIntel Virtual Machine : Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot™ 64-Bit Server VM mixed mode Window System : Version 6.1 (Build 7601: Service Pack 1)

Fault Count: 1

Abnormal termination: Segmentation violation

Register State (from fault): RAX = 00000000a2049d60 RBX = 00000000a23f3350 RCX = 00000000a22671e0 RDX = 4022000000000000 RSP = 00000000040481e0 RBP = 00000000a2049e48 RSI = 00000000a2165070 RDI = 00000000a2166f60

   R8 = 00000000a23f3330   R9 = 00000000a23f3340
  R10 = 0000000000000004  R11 = 00000000a2049e48
  R12 = 000000000000127f  R13 = 00000000a17fa1e0
  R14 = 0000000000000004  R15 = 0000000074ee93b0

RIP = 000007fef65c1063  EFL = 00010202

   CS = 0033   FS = 0053   GS = 002b

Stack Trace (from fault): [..] This error was detected while a MEX-file was running. If the MEX-file is not an official MathWorks function, please examine its source code for errors. Please consult the External Interfaces Guide for information on debugging MEX-files.

If this problem is reproducible, please submit a Service Request via: http://www.mathworks.com/support/contact_us/

A technical support engineer might contact you with further information.

Thank you for your help.

Has someone an idea, what my fault is? Thanks in advance!!! Best Regard, Bettina