Open Radar

 
Summary:
Using an affine transform with a bad value will crash the Mavericks window server, kicking you back to the login window.

Steps to Reproduce:
Make an NSView subclass with this code in a mac os x app. Activate the crashMe function.

- (id)initWithCoder:(NSCoder *)aDecoder
{
	if (self = [super initWithCoder:aDecoder])
    {
        CALayer *backingLayer = [CALayer layer];
        backingLayer.bounds = self.bounds;
        self.layer = backingLayer;
        [self setWantsLayer:YES];
    }
    
	return self;
}

-(IBAction)crashMe:(id)sender
{
    CAShapeLayer *badShape = [CAShapeLayer layer];
    badShape.strokeColor = [NSColor redColor].CGColor;

    [self.layer addSublayer:badShape];

    CGFloat length = 0.0;
    CGFloat nan = 1.0 / length;
    
    CGAffineTransform transform = (CGAffineTransform){ nan, nan, nan, nan, 0, 0 };
    CGMutablePathRef arrowPath = CGPathCreateMutable();
    CGPathMoveToPoint(arrowPath, &transform, length, 1);
    CGPathAddLineToPoint(arrowPath, &transform, length, 0);

    badShape.path = arrowPath;
    CGPathRelease(arrowPath);
}

Please see the attached example app.

Expected Results:
I would expect an error, or the app to quit or throw an exception. 

Actual Results:
The window server crashes and boots the user out to the login window

Version:
13Z603

https://gist.github.com/briandw/7255242