RT DLL general protection fault associated with serial I/O

[ndo]

Hello,

I'm experiencing Generatl Protection Faults on my real-time PC running LabView Real Time 9.1.0.  The faults occur when oppening/reading/writing from a serial rs-232/422 port, regardless of whether I use the Serial library or VISA library. 

How do I debug this? Is there a stack dump stored somewhere on the RT system when a fault occurs?

I am using LabWindows/CVI 2009 with the corresponding RT module to do my development.

Regards,

ndo

[Michael_W.]

Hi Ndo,

Please see the GettingStartedCVIRT.pdf.  You can find this under Start»All Programs»National Instruments»LabWindows/CVI version»LabWindows.  This includes information about ensuring you have CVI support installed as well as how to debug your application.

Cheers,

[ndo]

Hi Michael,

Thanks for the response.  When a General Protection Fault occurs, the debuger stops and does not give any details about the fault except for the line that caused it.  That is how I determined that the RS-232/422 comm was causing the problem.  I don't know how to dig deeper to find the exact cause.  On the Windows side, when a fault occurs, there is a stack dump that can be analyzed.  Is there a similar dump file on the RT?  What is the methodology to debug a crash on the RT?

--ndo

[Michael_W.]

Hi Ndo,

Please take a look at this KnowledgeBase:  Is There an Error Log File for my Real-Time Controller?

Cheers, 

[ndo]

Thanks Michael.  I'll give this a try.

--ndo

[ndo]

Michael,

I was able to get a report of the crash just as the KB instructed. 

(Although no report was generated when I ran my DLL in debug mode, the report was only generated when I deployed the DLL to the RT system and a crash occurred. )

I've attached the report here, can you tell me why it's crashing?

Regards,

ndo

[ndo]

Hi Michael,

Any update?

ndo

[ndo]

Update (in case anyone else is having the same issue):

I have narrowed down the problem to the RT Symmetric Multicore Processing Extension feature.  If I install SMP on my RT system, my software crashes (runs fine if there is no SMP installed).

Currently working with NI to identify the exact problem...

ndo

[cirrusio]

ndo,

Has there been any resolution to this?

Matt

[ndo]

Matt,

I've had no update from NI reagrding this issue.  I'm currently only using one core (no SMP).

--NDo