What is SKSpinLockSync in Sprite Kit and how do I fix it

Question

I am receiving a bug report with the following stack trace and I have no idea what the problem is. I\'ve seen suggestions that this could be caused by having an emitter\'s

Answer 1

I am building a Spritekit app. The app crashed irregularly with no debug info only leaving a pointer to the dreaded SKSpinLockLock. The app crashed in the middle of a complex set of "animation" actions. Like R.Randazzo mentioned in his post, lazy image loading could cause these problems. But all my animations are using preloaded images. Eventually I discovered a lazy loading image "hiding in the shadow", waiting to be presented as the result of my animation sequence and user interaction. After preloading this image too, the SKSpinLockLock ghost was gone. N.B. I am developing for IOS 7 +