Próbowałem debugować awarię przez ostatnie 10 godzin, a na koniec uprościłem ją do tego kodu:

NSError *error = nil;
NSData *data = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"payload" ofType:@"txt"]];
id obj = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];

Dzięki NSZombieEnabled powoduje to awarię aplikacji w trzeciej linii (w której następuje przetwarzanie) i loguje się:

*** -[CFString retain]: message sent to deallocated instance 0x758afa0

Zawartośćpayload.txt są:

[
   {
      "created_at":"2013-02-15T23:46:02-05:00",
      "description":"Take out the Big Gun sounded simple enough, except the Strogg were waiting. You, and a few marines like you, are the lucky ones. You've made it down in one piece and are still able to contact the fleet. The Gravity Well, the Strogg's newest weapon in its arsenal against mankind, is operational. With the fleet around Stroggos, 5% of ground forces surviving, and that number dwindling by the second, your orders have changed: free your comrades. Destroy the Gravity Well.Minimum: A 100% Windows XP/Vista-compatible computer system",
      "developer":"id Software",
      "external_id":"2340",
      "id":745,
      "image":"http://cdn.steampowered.com/v/gfx/apps/2340/header_292x136.jpg",
      "is_subscribed":0,
      "link":"http://store.steampowered.com/app/2340/",
      "price":"4.99",
      "seller_id":2,
      "thumb":"http://media.steampowered.com/steamcommunity/public/images/apps/2340/5bd6e22ffdf72fdfb5ce2092fa50150de5fbb56f.jpg",
      "title":"Quake II: Ground Zero",
      "updated_at":"2013-02-15T23:46:02-05:00",
      "is_subscribed":0
   },
   {
      "created_at":"2013-02-15T23:45:59-05:00",
      "description":"Rage through 32 single player levels and 6 deathmatch levels of sheer terror and fully immersive sound and lighting. Arm yourself against the cannibalistic Ogre, fiendish Vore and indestructible Schambler using lethal nails, fierce Thunderbolts and abominable Rocket and Grenade Launchers.Minimum: A 100% Windows XP/Vista-compatible computer system",
      "developer":"id Software",
      "external_id":"2310",
      "id":742,
      "image":"http://cdn.steampowered.com/v/gfx/apps/2310/header_292x136.jpg",
      "is_subscribed":0,
      "link":"http://store.steampowered.com/app/2310/",
      "price":"9.99",
      "seller_id":2,
      "thumb":"http://media.steampowered.com/steamcommunity/public/images/apps/2310/e5bdf8dc7759c573fe525d45b69011f6a173a984.jpg",
      "title":"Quake",
      "updated_at":"2013-02-15T23:45:59-05:00",
      "is_subscribed":0
   }
]

To tylko tablica 2 słowników. Nie jestem pewien, co powoduje tę awarię / co jest nie tak z tym JSON.

AKTUALIZACJA Usuwanie"is_subscribed":0 w pierwszym obiekcie w tablicy pozbywa się awarii.