SpriteKit 作为 SceneKit 的覆盖 SKShapeNode 崩溃

Question

I having a strange Crash in SKOverlayScene I do not have the same crash when I am using SKScene Alone not as overlay.

This is Console output.

Edit The crash never happens if address sanitizer is available.

malloc: * error for object 0x610000670e00: Invalid pointer dequeued from free list * set a breakpoint in malloc_error_break to debug

May someone help please?

Overlay SKSceme Code below:

- (instancetype)initWithSize:(CGSize)size
{
    if(self = [super initWithSize:size])
    {
        //[self setBackgroundColor:[SKColor greenColor]];

        _selectionNode = [SKShapeNode node]; // iVar
        [_selectionNode setLineWidth:1];
        [_selectionNode setStrokeColor:[SKColor whiteColor]];
        [_selectionNode setFillColor:[SKColor colorWithRed:0.2 green:0.5 blue:1 alpha:0.2]];
        ///[_selectionNode setZPosition:CGFLOAT_MAX-1];
    }
    return self;
}

- (void)mouseDragged:(NSEvent *)theEvent
{
    if(_selectionNode)
    {
        dispatch_async(dispatch_get_main_queue(), ^
        {
            @autoreleasepool
            {
                CGPoint point = [theEvent locationInNode:self];
                CGRect rect = CGRectMake(_selectionOrigin.x, _selectionOrigin.y, point.x - _selectionOrigin.x, point.y - _selectionOrigin.y);

                CGPathRef path = CGPathCreateWithRect(rect, NULL);
                if(path)
                {
                    [_selectionNode setPath:path]; //SIGABRT is sometimes shown here.
                    CGPathRelease(path);
                }
            }
        });
    }
    [super mouseDragged:theEvent];
}

- (void)mouseDown:(NSEvent *)theEvent
{
    if(_selectionNode)
    {
        dispatch_async(dispatch_get_main_queue(), ^
        {
            [self addChild:_selectionNode];
            _selectionOrigin = [theEvent locationInNode:self];
        });
    }

    [super mouseDown:theEvent];
}

- (void)mouseUp:(NSEvent *)theEvent
{
    if(_selectionNode)
    {
        dispatch_async(dispatch_get_main_queue(), ^
        {
            [_selectionNode removeFromParent];
            [_selectionNode setPath:nil];
        });
    }
    [super mouseUp:theEvent];
}

EDIT 2

Setting a BreakPoint in malloc_error_break show the following

libsystem_malloc.dylib`malloc_error_break: -> 0x7fffba83e147 <+0>: pushq %rbp 0x7fffba83e148 <+1>: movq %rsp, %rbp 0x7fffba83e14b <+4>: nop
0x7fffba83e14c <+5>: nopl (%rax) 0x7fffba83e150 <+9>: popq %rbp 0x7fffba83e151 <+10>: retq

Coming from various threads each time.

Edit 3 The crash is not recreating when using OpenGL Renderer.

But I really want to use Metal because it really gives twice better performance the only problem is this weird crash... is there anything I can do ?

Edit 4

I substitute SKShapeNode with SKSpriteNode and the problem is seems to be solved.

-- This smells like an Apple bug with: Metal SceneKit + SpriteKit and SKShapeNode.

I won't file any bug reports since Apple just ignores my reports.

Answer 1

One thing I discovered is that using overlaySKScene in SceneKit results in a lot of random crashes like this. Also note that when using SKScene as an overlaySKScene that call backs from actions are not on the Main Thread (whereas they are when used as a stand-alone scene).

My solution was to use a normal SKScene. Just add an SKView as a subview to your SCNScene and call presentScene to use SKScene in the normal way. That stopped the crashing for me.