Matlab crash after calling mex in function or loop

Hi,

I have two mex files to interface with a device which work correctly when run in the first time in my code:

startTDC( scan_time)
RawData = readTDC(ROImin,ROImax);

if I select the lines and run them for a second or many times by right clicking they also run correctly.

However if I run them in a section i.e.

startTDC( scan_time)
RawData = readTDC(ROImin,ROImax);

Matlab crashes (see details below). I get the same error calling them in a function.

Can anybody help?

Many thanks,

Chris

R2012b Windows 7

Crash report:
MATLAB crash file:C:\Users\Arrell\AppData\Local\Temp\matlab_crash_dump.6172-1:

------------------------------------------------------------------------
       Segmentation violation detected at Thu Sep 22 17:12:50 2016
------------------------------------------------------------------------

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 26 Stepping 5, GenuineIntel
  Virtual Machine : Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot(TM) Client VM mixed mode
  Window System   : Version 6.1 (Build 7601: Service Pack 1)

Fault Count: 1

Abnormal termination:
Segmentation violation

Register State (from fault):
  EAX = 00000000  EBX = 1c7f8f0e
  ECX = 00000000  EDX = 00040bf8
  ESP = 00be7140  EBP = 00be7164
  ESI = 00000006  EDI = 00000064

    EIP = 671b11f0  EFL = 00010293

     CS = 0000001b   DS = 00000023   SS = 00000023
     ES = 00000023   FS = 0000003b   GS = 00000000

Stack Trace (from fault):
[  0] 0x671b11f0 C:\Users\Arrell\Desktop\SCTDC\testMVS\readTDC.mexw32+00004592 ( mexFunction+000160 )
[  1] 0x02b5e024 C:\Program Files\MATLAB\R2012b\bin\win32\libmex.dll+00057380 ( mexRunMexFile+000132 )
[  2] 0x02b5ca79 C:\Program Files\MATLAB\R2012b\bin\win32\libmex.dll+00051833 ( inSwapMexfileReader+000201 )
[  3] 0x02b5cca3 C:\Program Files\MATLAB\R2012b\bin\win32\libmex.dll+00052387 ( inSwapMexfileReader+000755 )
[  4] 0x7f638638 C:\Program Files\MATLAB\R2012b\bin\win32\m_dispatcher.dll+00034360 ( Mfh_file::dispatch_fh+000424 )
[  5] 0x7f638e26 C:\Program Files\MATLAB\R2012b\bin\win32\m_dispatcher.dll+00036390 ( Mfunction_handle::dispatch+000742 )
[  6] 0x0267a117 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00565527 ( inDestroyWS+333927 )
[  7] 0x02663dd4 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00474580 ( inDestroyWS+242980 )
[  8] 0x0264f18b C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00389515 ( inDestroyWS+157915 )
[  9] 0x02963f83 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+03620739 ( inCallFcnWithTrapInDesiredWS+003361 )
[ 10] 0x02660882 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00460930 ( inDestroyWS+229330 )
[ 11] 0x02658174 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00426356 ( inDestroyWS+194756 )
[ 12] 0x02655743 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00415555 ( inDestroyWS+183955 )
[ 13] 0x0266c1e7 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00508391 ( inDestroyWS+276791 )
[ 14] 0x0266c302 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00508674 ( inDestroyWS+277074 )
[ 15] 0x0264ceec C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00380652 ( inDestroyWS+149052 )
[ 16] 0x0265248d C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00402573 ( inDestroyWS+170973 )
[ 17] 0x0266512d C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00479533 ( inDestroyWS+247933 )
[ 18] 0x7f638638 C:\Program Files\MATLAB\R2012b\bin\win32\m_dispatcher.dll+00034360 ( Mfh_file::dispatch_fh+000424 )
[ 19] 0x7f638e26 C:\Program Files\MATLAB\R2012b\bin\win32\m_dispatcher.dll+00036390 ( Mfunction_handle::dispatch+000742 )
[ 20] 0x026c7f19 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00884505 ( inMainLoopIdle+006825 )
[ 21] 0x026d06ef C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00919279 ( inEvalCmd+000703 )
[ 22] 0x026d53f9 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00939001 ( inSetMaxFrameCount+000665 )
[ 23] 0x026d53d5 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00938965 ( inSetMaxFrameCount+000629 )
[ 24] 0x026d5390 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00938896 ( inSetMaxFrameCount+000560 )
[ 25] 0x026b1fa0 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00794528 ( MathWorks::MException::MExceptionEnvelope::GetErrorMessage+001600 )
[ 26] 0x026cbf60 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00900960 ( inEvalCmdWithLocalReturn+000224 )
[ 27] 0x026cbf09 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00900873 ( inEvalCmdWithLocalReturn+000137 )
[ 28] 0x026cbe9e C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00900766 ( inEvalCmdWithLocalReturn+000030 )
[ 29] 0x026cbed9 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00900825 ( inEvalCmdWithLocalReturn+000089 )
[ 30] 0x026d0357 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00918359 ( inInitInterestRegistry+000407 )
[ 31] 0x026d0381 C:\Program Files\MATLAB\R2012b\bin\win32\m_interpreter.dll+00918401 ( inEvalCmdWithLocalReturnInDesiredWS+000033 )
[ 32] 0x023d8933   C:\Program Files\MATLAB\R2012b\bin\win32\iqm.dll+01149235 ( iqm::InternalEvalPlugin::inEvalCmdWithLocalReturn+000211 )
[ 33] 0x023d759a   C:\Program Files\MATLAB\R2012b\bin\win32\iqm.dll+01144218 ( iqm::InternalEvalPlugin::InternalEvalPlugin+002554 )
[ 34] 0x023d8aee   C:\Program Files\MATLAB\R2012b\bin\win32\iqm.dll+01149678 ( iqm::InternalEvalPlugin::inEvalCmdWithLocalReturn+000654 )
[ 35] 0x023d92d8   C:\Program Files\MATLAB\R2012b\bin\win32\iqm.dll+01151704 ( iqm::InternalEvalPlugin::execute+000152 )
[ 36] 0x0c305a24 C:\Program Files\MATLAB\R2012b\bin\win32\nativejmi.dll+00219684 ( nativejmi::JmiIIP::serializeExplicit+002308 )
[ 37] 0x0c32edbd C:\Program Files\MATLAB\R2012b\bin\win32\nativejmi.dll+00388541 ( Java_com_mathworks_jmi_Matlab_nativeGetMemOpt+002221 )
[ 38] 0x02328655   C:\Program Files\MATLAB\R2012b\bin\win32\iqm.dll+00427605 ( iqm::IqmQE::qeInstance+024549 )
[ 39] 0x02321b83   C:\Program Files\MATLAB\R2012b\bin\win32\iqm.dll+00400259 ( iqm::BaseIqmPlugin::createEvent+032115 )
[ 40] 0x7e1c9d7d C:\Program Files\MATLAB\R2012b\bin\win32\libmwbridge.dll+00040317 ( ioCmdLineEditSave+004109 )
[ 41] 0x7e1ca190 C:\Program Files\MATLAB\R2012b\bin\win32\libmwbridge.dll+00041360 ( ioReadLine+000096 )
[ 42] 0x7e1caa90 C:\Program Files\MATLAB\R2012b\bin\win32\libmwbridge.dll+00043664 ( ioReadLine+002400 )
[ 43] 0x7e1cdb57 C:\Program Files\MATLAB\R2012b\bin\win32\libmwbridge.dll+00056151 ( QueryMLFcnTable_libmwbridge+000343 )
[ 44] 0x7e1cdc0b C:\Program Files\MATLAB\R2012b\bin\win32\libmwbridge.dll+00056331 ( QueryMLFcnTable_libmwbridge+000523 )
[ 45] 0x7e1ce388 C:\Program Files\MATLAB\R2012b\bin\win32\libmwbridge.dll+00058248 ( mnParser+000488 )
[ 46] 0x7f29dfd3   C:\Program Files\MATLAB\R2012b\bin\win32\mcr.dll+00188371 ( mcrInstance::mnParser_on_interpreter_thread+000051 )
[ 47] 0x7f282af2   C:\Program Files\MATLAB\R2012b\bin\win32\mcr.dll+00076530 ( mcr::setInterpreterThreadToCurrent+021842 )
[ 48] 0x7f283615   C:\Program Files\MATLAB\R2012b\bin\win32\mcr.dll+00079381 ( mcr::setInterpreterThreadToCurrent+024693 )
[ 49] 0x7f283696   C:\Program Files\MATLAB\R2012b\bin\win32\mcr.dll+00079510 ( mcr::setInterpreterThreadToCurrent+024822 )
[ 50] 0x74e0c709   C:\Program Files\MATLAB\R2012b\bin\win32\uiw.dll+00313097 ( UIW_IsUserMessage+000121 )
[ 51] 0x74e0ccd6   C:\Program Files\MATLAB\R2012b\bin\win32\uiw.dll+00314582 ( UIW_SetGLIMUserMsg+000134 )
[ 52] 0x76b16d50                     C:\Windows\system32\USER32.dll+00224592 ( SetWindowsHookExA+000116 )
[ 53] 0x76aee179                     C:\Windows\system32\USER32.dll+00057721 ( SystemParametersInfoW+000271 )
[ 54] 0x76af2467                     C:\Windows\system32\USER32.dll+00074855 ( PtInRect+000253 )
[ 55] 0x77706b2e                      C:\Windows\SYSTEM32\ntdll.dll+00289582 ( KiUserCallbackDispatcher+000046 )
[ 56] 0x76af2af3                     C:\Windows\system32\USER32.dll+00076531 ( GetAncestor+000126 )
[ 57] 0x74dedfdd   C:\Program Files\MATLAB\R2012b\bin\win32\uiw.dll+00188381 ( UIW_SetCurrentDialog+000637 )
[ 58] 0x74e0dd0f   C:\Program Files\MATLAB\R2012b\bin\win32\uiw.dll+00318735 ( ws_FreeSystemFont+000495 )
[ 59] 0x01f14277 C:\Program Files\MATLAB\R2012b\bin\win32\libmwservices.dll+00672375 ( sysq::ws_ppeHook::ws_ppeHook+009991 )
[ 60] 0x01f14c8c C:\Program Files\MATLAB\R2012b\bin\win32\libmwservices.dll+00674956 ( sysq::removeCommitDatabaseUpdatesHook+001388 )
[ 61] 0x01f15d46 C:\Program Files\MATLAB\R2012b\bin\win32\libmwservices.dll+00679238 ( sysq::removeCommitDatabaseUpdatesHook+005670 )
[ 62] 0x01f170b8 C:\Program Files\MATLAB\R2012b\bin\win32\libmwservices.dll+00684216 ( sysq::addProcessPendingEventsUnitTestHook+000296 )
[ 63] 0x01f17258 C:\Program Files\MATLAB\R2012b\bin\win32\libmwservices.dll+00684632 ( sysq::addProcessPendingEventsUnitTestHook+000712 )
[ 64] 0x01f172ca C:\Program Files\MATLAB\R2012b\bin\win32\libmwservices.dll+00684746 ( sysq::addProcessPendingEventsUnitTestHook+000826 )
[ 65] 0x01f17322 C:\Program Files\MATLAB\R2012b\bin\win32\libmwservices.dll+00684834 ( svWS_ProcessPendingEvents+000018 )
[ 66] 0x7f284853   C:\Program Files\MATLAB\R2012b\bin\win32\mcr.dll+00084051 ( mcr::setInterpreterThreadToCurrent+029363 )
[ 67] 0x7f284ae2   C:\Program Files\MATLAB\R2012b\bin\win32\mcr.dll+00084706 ( mcr::setInterpreterThreadToCurrent+030018 )
[ 68] 0x7f279e2f   C:\Program Files\MATLAB\R2012b\bin\win32\mcr.dll+00040495 ( DepfunRules::postWarning+003231 )
[ 69] 0x7f27cb26   C:\Program Files\MATLAB\R2012b\bin\win32\mcr.dll+00052006 ( mcr_invoke_on_interpreter_thread+001094 )
[ 70] 0x00397632 C:\Program Files\MATLAB\R2012b\bin\win32\MATLAB.exe+00030258 ( ???+000000 )
[ 71] 0x0039772f C:\Program Files\MATLAB\R2012b\bin\win32\MATLAB.exe+00030511 ( ???+000000 )
[ 72] 0x00397938 C:\Program Files\MATLAB\R2012b\bin\win32\MATLAB.exe+00031032 ( ???+000000 )
[ 73] 0x00397dcd C:\Program Files\MATLAB\R2012b\bin\win32\MATLAB.exe+00032205 ( ???+000000 )
[ 74] 0x773bef1c                   C:\Windows\system32\kernel32.dll+00323356 ( BaseThreadInitThunk+000018 )
[ 75] 0x77723648                      C:\Windows\SYSTEM32\ntdll.dll+00407112 ( RtlInitializeExceptionChain+000239 )
[ 76] 0x7772361b                      C:\Windows\SYSTEM32\ntdll.dll+00407067 ( RtlInitializeExceptionChain+000194 )

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.

[James Tursa]

Usually this indicates a bug in the mex routine. But we would need to see the source code to have any hope of helping you. Maybe post a small version of your source code that reproduces the error. In general, it is not unusual for mex routines with memory access errors to seem to work the first time and fail on subsequent times (1st call corrupts memory but doesn't access that corrupted memory ... but subsequent calls access the corrupted memory).