[Octave-bug-tracker] [bug #57284] Crash in MEX file when outputs are not used

[Guillaume]

URL:
  <https://savannah.gnu.org/bugs/?57284>

                 Summary: Crash in MEX file when outputs are not used
                 Project: GNU Octave
            Submitted by: gyom
            Submitted on: Thu 21 Nov 2019 01:02:48 PM UTC
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Segfault, Bus Error, etc.
                  Status: None
             Assigned to: None
         Originator Name: Guillaume
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

When executing the following MEX file:


#include "mex.h"   

void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{

  const mwSize dims[] = {1, 1, 1};

  plhs[0] = mxCreateNumericArray(3, dims, mxDOUBLE_CLASS, mxREAL);
  plhs[1] = mxCreateNumericArray(3, dims, mxDOUBLE_CLASS, mxREAL);
  plhs[2] = mxCreateNumericArray(3, dims, mxDOUBLE_CLASS, mxREAL);
  plhs[3] = mxCreateNumericArray(3, dims, mxDOUBLE_CLASS, mxREAL);
}


Octave crashes with the following error message:


octave:1> testmex
*** Error in `octave-gui': free(): invalid next size (fast):
0x00007f25d8709710 ***
fatal: caught signal Aborted -- stopping myself...
Abort (core dumped)


It does not happen if called with "[a,b,c,d] = testmex;"




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