signal SIGSEGV, Segmentation fault

[Andreas Höschler]

Hi all,

I am testing one of my apps out on the recent GNUstep tree I managed to get to 
work on Ubuntu 16.04 in the meanwhile. I already got relatively far with a few 
minor tweaks (replacing deprecated methods,...). However, I got stuck at one 
point and have no idea how to proceed from here! :-(

I have a subclass

        MapView : ESMMapView : GSImageView : NSImageView

with 

@interface MapView : ESMMapView //FBMapView
{
   NSPoint _currentPosition;
   NSTimer *_routeFadeTimer;
   float _positionAlpha;
   BOOL _addAlpha;
   NSString *_message;

   NSArray *_routeNodes;
   NSBezierPath *_routePath;

   NSArray *_departurePaths;
   NSArray *_arrivalPaths;
   NSArray *_overlayPaths;
      
   BOOL _routeVisible;
   BOOL _departurePathVisible;
   BOOL _arrivalPathVisible;
}

        and

@interface ESMMapView : GSImageView  
{   
   BOOL _osmDrawing;
   BOOL _drawPrimaryInLays;
   BOOL _drawOtherInLays;
   NSRect _visibleMapSection;
   float _heightOfVisibleMapInKm;
   NSMutableArray *_labels;
   NSArray *_bezierPathsForLand;   
   NSData *_shapeData;
   
   @public   
   NSMutableArray *_rectObjects;   // make sure labels do not overlap
   NSMutableArray *_mapPaths;     // for each kind one, unless we are in 
detailed mode
   NSMutableArray *_mapShields;  // "A1", B 203",...
   NSMutableArray *_mapLabels;   // lables like "Bad Oldesloe", "AS Reinfeld", 
"Bahnhof",...
   NSMutableArray *_mapLocs;      // Polter, Companies,...
   NSMutableArray *_mapLines;     // routes
}


I get a 

Thread 1 "TimberNav" received signal SIGSEGV, Segmentation fault.
-[MapView drawRect:] (self=0xb7ca746e <-[NSView 
displayRectIgnoringOpacity:inContext:]+318>,
    _cmd=0x8a704b8, rect=...) at MapView.m:168
168           NSLog(@"routeVisible: %d", _routeVisible);
(gdb)

when running the app in gdb and simply a

Segmentation fault

when running the app directly. This happens in the MapView::drawRect method

- (void)drawRect:(NSRect)rect
{
   NSLog(@"MapView drawRect %@ ... _osmDrawing %d", NSStringFromRect(rect), 
_osmDrawing);
   [super drawRect:rect];
   NSLog(@"After super drawRect:rect");
   [self bums];
   //   if (image != nil && _osmDrawing == NO)
     {
      NSImage *image = [self image];
      NSSize imageSize = [image size];
      
      // draw route
      NSLog(@"routeVisible: %d", _routeVisible);  // <-- this causes the SIGSEGV
      NSLog(@"routePath: %@", _routePath);
      
      if (_routeVisible && _routePath != nil)
        {
         [[NSColor purpleColor] set];
         
         [_routePath setLineWidth:8];
         [_routePath stroke];
        }
    ...
}

while accessing one of its instance variables, actually in the 

      NSLog(@"routeVisible: %d", _routeVisible);

line. When I comment this line out I get the same error in the next line while 
accessing _routePath and so on. I am clueless how to fix this. The code works 
on MacOSX and also with on an ancient GNUstep/Debian/Kubuntu setup. Any idea 
what might cause this trouble on Ubuntu 16.04 with the latest GNUstep or how to 
further track this down?

Thanks a lot in advance!!

Andreas


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