title: __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ 18 23 CoreFoundation crash
body: <p>I am getting following crash. Can anyone tell me the reason for this crash?</p>
  
  <pre><code>__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 18 23  CoreFoundation  crash
  </code></pre>
  
  <p>I`m not using threads.
  The NSZombieEnabled and instruments did not clarify the reason of the crash at all.
  Please, help me.</p>
  
  <p><code></p>
  
  <pre><code>0   libobjc.A.dylib                 0x3b0805be objc_msgSend + 30
  1   CoreFoundation                  0x3332130c CFRelease + 96
  2   CoreFoundation                  0x333fc430 __CFBasicHashDrain + 256
  3   CoreFoundation                  0x333213ce CFRelease + 290
  4   CoreFoundation                  0x333fc430 __CFBasicHashDrain + 256
  5   CoreFoundation                  0x333213ce CFRelease + 290
  6   ImageIO                         0x34013008 _CGImagePlusFinalize + 48
  7   CoreFoundation                  0x333213ce CFRelease + 290
  8   CoreFoundation                  0x333fc430 __CFBasicHashDrain + 256
  9   CoreFoundation                  0x333213ce CFRelease + 290
  10  ImageIO                         0x34179bb2 releaseInfoPNG + 18
  11  ImageIO                         0x34029ae4 ImageProviderReleaseInfoCallback + 32
  12  CoreGraphics                    0x3346b1c8 image_provider_finalize + 32
  13  CoreFoundation                  0x333213ce CFRelease + 290
  14  CoreGraphics                    0x33464f48 image_finalize + 60
  15  CoreFoundation                  0x333213ce CFRelease + 290
  16  QuartzCore                      0x34fa44ce CA::Layer::State::~State() + 94
  17  QuartzCore                      0x34fa7a4e CA::Layer::~Layer() + 290
  18  QuartzCore                      0x34fa77ae -[CALayer dealloc] + 138
  19  QuartzCore                      0x34f97a70 CA::Layer::free_transaction(CA::Transaction*) + 68
  20  QuartzCore                      0x34f960a4 CA::Transaction::commit() + 400
  21  QuartzCore                      0x34f95eac CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 56
  22  CoreFoundation                  0x333b56ca __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 18
  23  CoreFoundation                  0x333b39bc __CFRunLoopDoObservers + 272
  24  CoreFoundation                  0x333b3d12 __CFRunLoopRun + 738
  25  CoreFoundation                  0x33326eb8 CFRunLoopRunSpecific + 352
  26  CoreFoundation                  0x33326d44 CFRunLoopRunInMode + 100
  27  GraphicsServices                0x36eea2e6 GSEventRunModal + 70
  28  UIKit                           0x3523c2fc UIApplicationMain + 1116
  </code></pre>
  
  <p></code></p>