Re: Crash averted when run under debugger
Re: Crash averted when run under debugger
- Subject: Re: Crash averted when run under debugger
- From: Rick Mann <email@hidden>
- Date: Fri, 27 Apr 2012 17:38:50 -0700
Ah. I think it's because I have zombies enabled, and that setting only sticks if running from Xcode. If I launch the app from SpringBoard, zombies aren't on.
Turns out, I wasn't unregistering a KVO, so the call was going to bad memory.
--
Rick
On Apr 27, 2012, at 17:31 , Rick Mann wrote:
> I'm running into a KVO-related crash, on device only. Unfortunately, it doesn't happen if I run with the debugger attached. But if I run the exact same binary without the debugger (i.e., launching by tapping its icon), then I can reproduce the crash reliably.
>
> The symbolicated crash log, unfortunately, provides no clue as to which object(s) is involved in the KVO, and I use it in a number of places.
>
> Any techniques I can use to check on this? What's different when running with the debugger attached?
>
> The crash is
>
> Exception Type: EXC_BAD_ACCESS (SIGSEGV)
> Exception Codes: KERN_INVALID_ADDRESS at 0x70015785
> Crashed Thread: 0
>
> Thread 0 name: Dispatch queue: com.apple.main-thread
> Thread 0 Crashed:
> 0 libobjc.A.dylib 0x36557f78 objc_msgSend + 16
> 1 Foundation 0x34cce74c NSKVOPendingNotificationCreate + 216
> 2 Foundation 0x34cce652 NSKeyValuePushPendingNotificationPerThread + 62
> 3 Foundation 0x34cc0744 NSKeyValueWillChange + 408
> 4 Foundation 0x34d1ace6 -[NSObject(NSKeyValueObservingPrivate) _willChangeValuesForKeys:] + 486
> 5 CoreData 0x344b9048 -[NSFaultHandler turnObject:intoFaultWithContext:] + 188
> 6 CoreData 0x344ba638 -[NSManagedObject dealloc] + 68
> 7 CoreData 0x344b9b74 -[_PFManagedObjectReferenceQueue _processReferenceQueue:] + 840
> 8 CoreData 0x344bcfd0 _performRunLoopAction + 196
> 9 CoreFoundation 0x31cdcb14 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 12
> 10 CoreFoundation 0x31cdad50 __CFRunLoopDoObservers + 252
> 11 CoreFoundation 0x31cdb0aa __CFRunLoopRun + 754
> 12 CoreFoundation 0x31c5e49e CFRunLoopRunSpecific + 294
> 13 CoreFoundation 0x31c5e366 CFRunLoopRunInMode + 98
> 14 GraphicsServices 0x356bc432 GSEventRunModal + 130
> 15 UIKit 0x328bfe76 UIApplicationMain + 1074
> 16 iPadWeather 0x000a69f0 main (main.m:16)
> 17 iPadWeather 0x000a6994 start + 32
>
>
>
> Thanks,
> Rick
>
>
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