Stack overflow in mex

Hi Friends,

I have one confusion regarding a mex code. The code is giving me a segmentation fault.

#include<math.h>
#include<stdio.h>
#include<mex.h>   
#include <complex.h>

void mexFunction(int nlhs,mxArray *outputs[],int nrhs,const mxArray *prhs[])
{
    const mxArray *R_locpr,*Nbpscpr,*mlpr,*Sym_x3_searchpr,*kmodpr,*fxpr,*fp_rsym_fmt_prodpr;
    int R_loc_rowLen,R_loc_colLen,Sym_x3_search_rowLen,Sym_x3_search_colLen,i,j;
    double *R_locr,*R_loci,*dmp_fmt_values,resolution,R_23_loc_in_cncr,R_23_loc_in_cnci,R_13_loc_in_cncr,R_13_loc_in_cnci,R_12_loc_in_cncr,R_12_loc_in_cnci;
    double *Nbpsc,*kmod,*fxp,*fp_rsym_fmt_prod,*Sym_x3_searchr,*Sym_x3_searchi,*dummyr,*dummyi,*SYM_locr,*SYM_loci;
    double complex  *SYM_loc,*Sym_x3_search,*R_loc,R_23_loc_in_cnc,R_13_loc_in_cnc,R_12_loc_in_cnc,c;
    mxArray *dmp_fmt,*rsym_prod,*xData[2],*array_ptr ;
    int *ml;
    R_locpr=prhs[5];
    R_locr=mxGetPr(R_locpr);
    R_loci=mxGetPi(R_locpr);
    R_loc_rowLen=mxGetN(R_locpr);
    R_loc_colLen=mxGetM(R_locpr);
    for(i=0;i<R_loc_colLen;i++)
    {
        for(j=0;j<R_loc_rowLen;j++)
        {
            R_loc[i*R_loc_rowLen+j]=R_locr[i*R_loc_rowLen+j]+R_loc[i*R_loc_rowLen+j]* _Complex_I;

          }
      }
      dmp_fmt = mexGetVariable( "caller","fp_x_dmp_fmt");
      if(dmp_fmt==NULL)
      {     
          mexErrMsgTxt("Could not get fp_x_dmp_fmt from MATLAB workspace.");
      }
      else
      {
          dmp_fmt_values=mxGetPr(dmp_fmt);
          resolution = pow(0.5,dmp_fmt_values[1]);
      }
      if(R_loc_colLen == 3)
      {
          R_23_loc_in_cnc=R_loc[7];
          R_13_loc_in_cnc=R_loc[6];
      }
      R_12_loc_in_cnc=R_loc[3];
      mlpr=prhs[14];
      Nbpscpr=prhs[3];
      ml=mxGetPr(mlpr);
      Nbpsc=mxGetPr(Nbpscpr);

      Sym_x3_searchpr=prhs[1];
      Sym_x3_searchr=mxGetPr(Sym_x3_searchpr);
      Sym_x3_searchi=mxGetPi(Sym_x3_searchpr);
      Sym_x3_search_rowLen=mxGetN(Sym_x3_searchpr);
      Sym_x3_search_colLen=mxGetM(Sym_x3_searchpr);
      for(i=0;i<Sym_x3_search_colLen;i++)
      {
          for(j=0;j<Sym_x3_search_rowLen;j++)
          {
              Sym_x3_search[i*Sym_x3_search_rowLen+j]=Sym_x3_searchr[i*Sym_x3_search_rowLen+j]+Sym_x3_searchi[i*Sym_x3_search_rowLen+j]* _Complex_I;
          }
      }
      kmodpr=prhs[4];
      printf("%d\n",mxGetN(kmodpr));
      printf("%d",mxGetM(kmodpr));
      kmod=mxGetPr(kmodpr);

       if(kmodpr==NULL)
      {     
          mexErrMsgTxt("Could not get kmod from MATLAB workspace.");
      }
      fxpr=prhs[13];
      fxp=mxGetPr(fxpr);
      fp_rsym_fmt_prodpr= mexGetVariable( "caller","fp_rsym_prod_fmt");
      if(fp_rsym_fmt_prodpr==NULL)
      {     
          mexErrMsgTxt("Could not get fp_rsym_prod_fmt from MATLAB workspace.");
      }
      else
      {
          fp_rsym_fmt_prod=mxGetPr(fp_rsym_fmt_prodpr);
      }
      if(R_loc_colLen == 3)
      {
          for (i=0;i<Sym_x3_search_colLen;i++)
          {
              for(j=0;j<Sym_x3_search_rowLen;j++)
              {
                      SYM_loc[i*Sym_x3_search_rowLen+j]=0;
              }
          }

      }
  }

Here is the log file:
-----------------------------------------------------------------------
       Segmentation violation detected at Fri Sep 28 17:51:08 2012
------------------------------------------------------------------------

Configuration:
  MATLAB Version:   7.5.0.338 (R2007b)
  MATLAB License:   XXXXXX
  Operating System: Linux 2.6.20-1.2962.fc6 #1 SMP Tue Jun 19 19:27:14 EDT 2007 i686
  GNU C Library:    2.5 stable
  Window System:    The X.Org Foundation (70101000), display :0.0
  Current Visual:   0x23 (class 4, depth 24)
  Processor ID:     x86 Family 15 Model 4 Stepping 7, GenuineIntel
  Virtual Machine:  Java 1.6.0 with Sun Microsystems Inc. Java HotSpot(TM) Client VM mixed mode, sharing
  Default Charset:  UTF-8

Register State:
  eax = 00000400   ebx = 00afdbd0
  ecx = 08b5a5f0   edx = 00000000
  esi = 08b5a3f0   edi = 00000040
  ebp = 054ca198   esp = 054ca120
  eip = 00afc80e   flg = 00010206

Stack Trace:
  [0] list_decode.mexglx:mexFunction~(0, 0x054caa44, 15, 0x054caaa4) + 370 bytes
  [1] libmex.so:mexRunMexFile(0, 0x054caa44, 15, 0x054caaa4) + 111 bytes
  [2] libmex.so:Mfh_mex::runMexFileWithSignalProtection(int, mxArray_tag**, int, mxArray_tag**)(0x08e887e0, 0, 0x054caa44, 15) + 120 bytes
  [3] libmex.so:Mfh_mex::dispatch_file(int, mxArray_tag**, int, mxArray_tag**)(0x08e887e0, 0, 0x054caa44, 15) + 254 bytes
  [4] libmwm_dispatcher.so:Mfh_file::dispatch_fh(int, mxArray_tag**, int, mxArray_tag**)(0x08e887e0, 0, 0x054caa44, 15) + 217 bytes
  [5] libmwm_interpreter.so:ResolverFunctionDesc::CallFunction(int, mxArray_tag**, int, mxArray_tag**)(0x054cb024, 0, 0x054caa44, 15) + 808 bytes
  [6] libmwm_interpreter.so:Resolver::CallMFunction(int, int, _m_operand*, m_operand_storage*, int, _m_operand*, m_operand_storage*, int*)(0x054cac00, 0, 1, 0xb27ed090) + 1530 bytes
  [7] libmwm_interpreter.so:inResolveMFunctionCall(_m_function_desc*, int, int, _m_operand*, m_operand_storage*, int, _m_operand*, m_operand_storage*, int*, inMarshalType*, int, mpsTypeSequenceNlhs const*, mxArray_tag* (*)(int))(0xb26e50b0, 0, 1, 0xb27ed090) + 461 bytes
  [8] libmwm_interpreter.so:accelImpl::MFunctionCall(_accelOp**)(0x054cb148, 0x054cb160, 0, 0x08d3cb68) + 216 bytes
  [9] libmwm_interpreter.so:accelImpl::Exec()(0x054cb148, 0xb26d9a88, 0x054cb158, 0xb2600000) + 215 bytes
  [10] libmwm_interpreter.so:accelCode::Call(inMarshalType*, int*) const(0xb2a36f80, 0x054cb320, 0x054cb31c, 0x015149a0) + 105 bytes
  [11] libmwm_interpreter.so:inJit::ExecuteHotSegment(_inJitAccelInfo*, opcodes*, int*, int*)(0x054cb4a4, 0x054cb4ec, 0x054cb4bc, 0x054cb94c) + 1393 bytes
  [12] libmwm_interpreter.so:.L752(1, 0, 6, 0) + 158 bytes
  [13] libmwm_interpreter.so:protected_inInterp(inDebugCheck, int, int, opcodes, inPcodeNest_tag*, int*)(1, 0, 1, 0) + 121 bytes
  [14] libmwm_interpreter.so:inInterPcodeSJ(inDebugCheck, int, int, opcodes, inPcodeNest_tag*, int*)(0, 0xb2bc6690, 0x054cb94c, 0x054cb94c) + 297 bytes
  [15] libmwm_interpreter.so:inExecuteMFunctionOrScript(Mfh_mp*, bool)(0x08d76a20, 1, 0x054cbc6c, 0) + 625 bytes
  [16] libmwm_interpreter.so:inRunMfile(int, mxArray_tag**, int, mxArray_tag**, Mfh_mp*, inWorkSpace_tag*)(0, 0x054cbc6c, 0, 0x054cbccc) + 640 bytes
  [17] libmwm_interpreter.so:Mfh_mp::dispatch_file(_mdUnknown_workspace*, int, mxArray_tag**, int, mxArray_tag**)(0x08d76a20, 0, 0, 0x054cbc6c) + 64 bytes
  [18] libmwm_interpreter.so:Mfh_mp::dispatch_file(int, mxArray_tag**, int, mxArray_tag**)(0x08d76a20, 0, 0x054cbc6c, 0) + 54 bytes
  [19] libmwm_dispatcher.so:Mfh_file::dispatch_fh(int, mxArray_tag**, int, mxArray_tag**)(0x08d76a20, 0, 0x054cbc6c, 0) + 217 bytes
  [20] libmwm_interpreter.so:inDispatchFromStack(int, char const*, int, int)(620, 0x08e91034 "mexcallfunctionmatlab", 0, 0) + 1078 bytes
  [21] libmwm_interpreter.so:inDispatchCall(char const*, int, int, int, int*, int*)(0, 0x054cbfb8, 0x08e91028, 0x00b270f9) + 160 bytes
  [22] libmwm_interpreter.so:.L777(2, 0, 0, 0) + 165 bytes
  [23] libmwm_interpreter.so:protected_inInterp(inDebugCheck, int, int, opcodes, inPcodeNest_tag*, int*)(2, 0, 0, 0) + 121 bytes
  [24] libmwm_interpreter.so:inInterPcodeSJ(inDebugCheck, int, int, opcodes, inPcodeNest_tag*, int*)(0, 0xb2bc48e0, 0x054cc3e8, 0x00f4ebf0) + 297 bytes
  [25] libmwm_interpreter.so:inInterPcode(2, 0, 0x01063090, 0x01062310) + 158 bytes
  [26] libmwm_interpreter.so:inEvalStringWithIsVarFcn(_memory_context*, char const*, EvalType, int, mxArray_tag**, inDebugCheck, _pcodeheader*, int*, bool (*)(void*, char const*), void*, bool)(0x00fc4648 ", 0x08e145a0 "mexcallfunctionmatlab\n", 0, 0) + 2892 bytes
  [27] libmwm_interpreter.so:inEvalCmdWithLocalReturnandtype(char const*, int*, inDebugCheck, bool)(0, 0, 0xb3242d80, 0x00d6ba28) + 149 bytes
  [28] libmwbridge.so:ThrowSignal(char const*)(0x08e145a0 "mexcallfunctionmatlab\n", 2, 0x054cd06c ", 0x008237c4) + 99 bytes
  [29] libmwbridge.so:mnParser(0x054cd0f0, 0x08a8fc48, 1, 0x00559bc2) + 277 bytes
  [30] libmwmcr.so:mcrInstance::mnParser()(0x08a8fc48, 0x054cf388, 0x08a8fc38, 0x08a42b90) + 52 bytes

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 it is an official MathWorks function, please
follow these steps to report this problem to The MathWorks so we
have the best chance of correcting it:

The next time MATLAB is launched under typical usage, a dialog box will
open to help you send the error log to The MathWorks. Alternatively, you
can send an e-mail to [e-mail] with the following file attached:
    matlab_log

If the problem is reproducible, please submit a Service Request via:
    http://www.mathworks.com/support/contact_us/ts/help_request_1.html

A technical support engineer might contact you with further information.

Thank you for your help. Save your workspace and restart MATLAB.

Anyone having idea about the problem or rather how to look stack file.

Thanks.

[Walter Roberson]

Please reformat the question; see http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

[Jan]

Please format your code. It is easy and makes your message readable. Code formatting has been discussed in this forum, such frequently, that I hesitate to do this again.

[JasonLuo]

Did you find solution to the problem? I encountered the similar case.

[Jan]

@JasonLuo: And the solution will be similar to the posted method: Use a debugger to identify the problem. Obviously your C code contains a bug. As long as you do not show us the code (in a new thread - do not hijack this one), all we can do is to suggest to find and fix it.

Answer 1

[Jan]

You can use the debugger of the C-Compiler to find the line, which causes the problems. Another idea would be to insert some mexPrintf() commands until you find the error.

The code is really hard to read, even if it would be formatted properly. E.g. you obtain inputs by mexGetVariable("caller", "fp_x_dmp_fmt");, which is ugly. Some spaces would increase the readability substantially. Therefore I do not expect, that a forum user will analyze the cause of your troubles.

Answer 2

[priyadharshini p]

clear pcode;

clear classes;

mypi = raspi;

mycam = cameraboard(mypi,'Resolution','1280x720');

for ii = 1:1000

img = snapshot(mycam);

imagesc(img);

drawnow

end

mycam.Rotation = 180;

videoFrame = record(mycam,'myvideo.avi',60);

foreground = step(foregroundDetector,videoFrame);

imwrite(videoFrame,'D:\referenceimage.jpg','jpg');

videoPlayer = vision.VideoPlayer('Name', 'Detected Cars');

videoPlayer.Position(3:4) = [650,400]; % window size: [width, height]

se = strel('square', 3); % morphological filter for noise removal

referenceimage=imread('D:\referenceimage.jpg');

X=zeros(2,121);

Y=zeros(2,121);

Z=zeros;

while ~isDone(videoReader)

frame = step(videoReader); % read the next video frame

% Detect the foreground in the current video frame

foreground = step(foregroundDetector, frame);

% Use morphological opening to remove noise in the foreground

filteredForeground = imopen(foreground, se);

%-----------------------SPEED ---------------------------%

frame2=((im2double(frame))-(im2double(referenceimage)));

frame1=im2bw(frame2,0.1);

[Labelimage]=bwlabeln(frame1);

stats=regionprops(Labelimage,'basic');

BB=stats.BoundingBox;

i=2; %fblasst for

X(i)=BB(1);

Y(i)=BB(2);

Dist=((X(i)-X(i-1))^2+(Y(i)-Y(i-1))^2)^(1/2);

Z(i)=Dist;

M=median(Z);

%disp(M);

%clc;

%disp('speed=')

Speed=((M)*(120/8))/(4);

%disp(Speed);

%SPEED = M ???????????

i = i + 1;

SE = strel('disk',6);

frame3=imclose(frame1,SE);

step(videoReader);

pause(0.05);

%if(i==121) end; ??

%-----------------------SPEED ---------------------------%

% Detect the connected components with the specified minimum area, and

% compute their bounding boxes

blobAnalysis = vision.BlobAnalysis('BoundingBoxOutputPort', true, ...

'AreaOutputPort', true, 'CentroidOutputPort', true, ...

'MinimumBlobArea', 150);

%bbox = step(blobAnalysis, filteredForeground);

[areas, centroids, bbox] = step(blobAnalysis, filteredForeground);

% Draw bounding boxes around the detected cars

result = insertShape(frame, 'Rectangle', bbox, 'Color', 'green');

% Display the number of cars found in the video frame

%ICI

%disp(centroids); //show...

%disp(size(centroids));//show....

numCars = size(bbox, 1); %cars ...

numCars_str = ['car number:', num2str(size(bbox, 1))];

speed_str = [num2str(Speed),'KM/h'];

result = insertText(result,[10,10],numCars_str, 'BoxOpacity', 1, ...

'FontSize', 14);

for i=1:size(bbox, 1)

result1 = insertText(result,[centroids(i,1),centroids(i,2)], speed_str, 'BoxOpacity', 1, ...

'FontSize', 20);

step(videoPlayer, result); % display the results

disp('numCars');

disp(numCars)

step(videoPlayer, result1);

disp('speed');

disp(speed_str);

% find total number of cars in whole frame

for ii=1:length(videoFrame)%numof frames

totalcount(ii)=videoFrame(ii);

end

totcars=sum(totalcount)/5;

end

end

disp('Total number of cars in entire video')

disp(round(totcars));

stop(mycam);

getFile(mypi,'myvideo.avi','E:\mat');

error

Error using raspi.internal.cameraboard/record

Too many output arguments.

Error in mm (line 11)

videoFrame = record(mycam,'myvideo.avi',60);

[Steven Lord]

This is not related to the original question. Please post your code in a new question using the Ask link at the top of the page.

Answer 3

[priyadharshini p]

Error using raspi.internal.cameraboard/record

Too many output arguments.

Error in mm (line 11)

videoFrame = record(mycam,'myvideo.avi',60);

Answer 4

[priyadharshini p]

How to solve this error