> On Feb 12, 2016, at 9:46 PM, Graham Cox <[email protected]> wrote:
> 
> 
>> On 13 Feb 2016, at 10:13 AM, Quincey Morris 
>> <[email protected]> wrote:
>> 
>> On Feb 12, 2016, at 14:58 , Graham Cox <[email protected]> wrote:
>>> 
>>> 0   libobjc.A.dylib                 0x00007fff9673e4dd objc_msgSend + 29
>>> 1   com.apple.QuartzCore            0x00007fff9550eb45 
>>> CA::Layer::setter(unsigned int, _CAValueType, void const*) + 165
>> 
>> Unfortunately, it’s not obvious that it’s an AppKit-caused crash, or 
>> anything other than a memory management bug in your code.
>> 
>> Think about scenarios. You could have had a reference to an object that you 
>> released, causing deallocation. That memory block is re-allocated for 
>> something in AppKit, then you accidentally release your unowned reference 
>> again. Hilarity pursues.
>> 
> 
> 
> My thoughts exactly, except (I should have mentioned) I’ve been running with 
> zombies on and this crash occurs still (but only once in a blue moon). I 
> guess that still could mean it’s some other memory that’s getting clobbered. 
> The sort of bug I hate, there’s so few ways to get a handle on it.

Is it possible that you might have accidentally accessed something from a 
background thread?

Charles


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