EXC_BAD_ACCESS in @autoreleasepool from a block?

Look in motionManager startAccelerometerUpdatesToQueue: . Very likely you save the queue parameter in a property there, and then release it in your dealloc . But when you placed the queue value into the property you didn't retain it.

Best way to debug these errors is in Instruments. Run using Zombie profile, and when you execute the code that causes the bad access, you will get a popup window. Click the arrow in the lower right corner to see the alloc/dealloc list, and one line will show you the offending code.

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