This will crash the Mac OS X Mavericks window server.

RLCrashyView.m

//
//  RLCrashyView.m
//  CrashyMcCrashy
//
//  Created by brian on 10/31/13.
//  Copyright (c) 2013 Rantlab. All rights reserved.
//

#import <Cocoa/Cocoa.h>

@interface RLCrashyView : NSView

@end


#import "RLCrashyView.h"
#import <QuartzCore/QuartzCore.h>

@implementation RLCrashyView

- (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);
}

@end