Eric
With the current CVS on my XP machine (the one that runs) I have been trying
to debug this problem. Here is the progress to date.
I have edited "free_data" as so to allow facilitate breakpoint setting
void free_data()
{
if ( _data )
free( _data );
_data = NULL;
}
and then set a breakpoint at the "if" statement.
If I single step (F11) at the first occurrence of the breakpoint it fails as
it enters "free( _data)"
My guess is that space is not allocated for the rumble.wav data.
Sadly I am retired now and it is several years since I last debugged a
program. Even then as a Fortran man my C++ skills were somewhat lacking an
things like pointers to pointers got my poor brain confused.
I suppose the good news is that I am able to duplicate the fault on the XP
machine (which normally runs without fault) simply by using debug runtime..
Hope this is some help.
Alan
--------------------------------------------------
From: "Erik Hofman" <[email protected]>
Sent: Monday, December 07, 2009 1:37 PM
To: "FlightGear developers discussions"
<[email protected]>
Subject: Re: [Flightgear-devel] Debug Assertion Failed in Sample_opneal.hxx
> Alan Teeder wrote:
>> Eric
>>
>> An aircraft that I am developing caused Flightgear to crash on the Vista
>> box, but not on the XP one.
>> This I traced to some bad coding in my JSBsim aero file:-
>>
>> <table> <!-- Ch-delta
>> elevator -->
>> <independentVar lookup="row">
>> fcs/elevator-pos-deg</independentVar>
>> <tableData>
>>
>> <!-- **********************************************
>> No surface deflections specified in input file
>> ********************************************** -->
>>
>> </tableData>
>> </table>
>>
>> It was an empty table generated by Datcom+ which I had not got around to
>> filling in.
>> The XP machine, which I use most of the time does not hiccup at this.
>>
>> Flightgear on the Vista laptop also crashes with something that appears
>> to
>> be related to the sound patches, AND also every time that I exit.
>>
>> The XP box sees none of these problems.
>>
>>>From this I now believe that the problem is that the Vista laptop is less
>> tolerant of run-time errors than the XP box.
>>
>> As far as Sample_openal.hxx is concerned all I can guess from my debug
>> sessions at is that there is some kind of a problem at the time that
>> "Rumble.wav" is used and it is even possible that the problem is at the
>> XML
>> code level.
>
> It's not getting easier to track down. Although maybe it indicates an
> uninitialized variable or something like that.
>
> It might even be allocated memory that is reserved at an unrelated piece
> of code but that overwrites the section that gets freed by the
> soundmanager.
>
> Erik
>
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