Re: Debugging hints
Re: Debugging hints
- Subject: Re: Debugging hints
- From: Martin Hewitson <email@hidden>
- Date: Thu, 22 Dec 2011 15:03:31 +0100
On 22, Dec, 2011, at 02:39 PM, Mike Abdullah wrote:
> Did you actually write this app to be dual-mode, or are you under the impression that turning off garbage collection will magically fix things?
To be honest, I wrote the app assuming garbage collection was off. I think it must have got turned on by mistake, perhaps during the move to Xcode 4. Not sure.
I am under the impression (according to what others have written) that turning off garbage collection will stop the crashes in the garbage collection queue. I think this is a reported bug, but I didn't follow that thread very long. I just was surprised to find garbage collection on in the app, so I switched it off. This revealed the bug, which I'd like now to fix, of course.
>
> Going by the stack trace, this is a classic zombie. Use Instruments to find the bug.
OK, I'll try that. Thanks.
Martin
>
> On 22 Dec 2011, at 10:48, Martin Hewitson wrote:
>
>> Dear list,
>>
>> I have a very complex document based app. If I run the app compiled with garbage collection support, then I can open and close document windows without problems. With garbage collected disabled, opening and closing the document windows results in crashes. Clearly I have a memory management issue. My problem is that the crash report doesn't help me. Running in Xcode, the debugger drops out in NSApplicationMain with the following back trace:
>>
>> #0 0x00007fff91380398 in objc_msgSend_vtable14 ()
>> No symbol table info available.
>> #1 0x00007fff8ce33110 in CFRelease ()
>> No symbol table info available.
>> #2 0x00007fff8ce5b5f0 in -[__NSArrayM dealloc] ()
>> No symbol table info available.
>> #3 0x00007fff8bb06dd2 in -[NSObjectController _dealloc] ()
>> No symbol table info available.
>> #4 0x00007fff8b8fb6a4 in -[NSArrayController _dealloc] ()
>> No symbol table info available.
>> #5 0x00007fff8b9aa1bc in -[NSController dealloc] ()
>> No symbol table info available.
>> #6 0x00007fff8b8a34d5 in -[_NSBindingInfo dealloc] ()
>> No symbol table info available.
>> #7 0x00007fff8ce33110 in CFRelease ()
>> No symbol table info available.
>> #8 0x00007fff8ce5b5f0 in -[__NSArrayM dealloc] ()
>> No symbol table info available.
>> #9 0x00007fff8b838e7d in -[NSBinder _dealloc] ()
>> No symbol table info available.
>> #10 0x00007fff8b838e1e in -[NSBinder dealloc] ()
>> No symbol table info available.
>> #11 0x00007fff9138403c in (anonymous namespace)::AutoreleasePoolPage::pop ()
>> No symbol table info available.
>> #12 0x00007fff8ce5bf75 in _CFAutoreleasePoolPop ()
>> No symbol table info available.
>> #13 0x00007fff8ce634e4 in __CFRunLoopRun ()
>> No symbol table info available.
>> #14 0x00007fff8ce62ae6 in CFRunLoopRunSpecific ()
>> No symbol table info available.
>> #15 0x00007fff88bcd3d3 in RunCurrentEventLoopInMode ()
>> No symbol table info available.
>> #16 0x00007fff88bd463d in ReceiveNextEventCommon ()
>> No symbol table info available.
>> #17 0x00007fff88bd44ca in BlockUntilNextEventMatchingListInMode ()
>> No symbol table info available.
>> #18 0x00007fff8b6363f1 in _DPSNextEvent ()
>> No symbol table info available.
>> #19 0x00007fff8b635cf5 in -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] ()
>> No symbol table info available.
>> #20 0x00007fff8b63262d in -[NSApplication run] ()
>> No symbol table info available.
>> #21 0x00007fff8b8b180c in NSApplicationMain ()
>>
>>
>> Can anyone offer any hints or suggestions as to how I can better go about finding this memory problem?
>>
>> (By the way, the reason I want to switch off the garbage collector is that I get intermittent crashes to do with the garbage collector queue; googling revealed that others have seen these crashes and the consensus seemed to be, switch off garbage collection. In any case, I don't like the fact that I can't switch off garbage collection due to what must be a bug somewhere.)
>>
>>
>> Best wishes,
>>
>> Martin
>>
>>
>>
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> Martin Hewitson
>> Albert-Einstein-Institut
>> Max-Planck-Institut fuer
>> Gravitationsphysik und Universitaet Hannover
>> Callinstr. 38, 30167 Hannover, Germany
>> Tel: +49-511-762-17121, Fax: +49-511-762-5861
>> E-Mail: email@hidden
>> WWW: http://www.aei.mpg.de/~hewitson
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>>
>>
>>
>>
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Martin Hewitson
Albert-Einstein-Institut
Max-Planck-Institut fuer
Gravitationsphysik und Universitaet Hannover
Callinstr. 38, 30167 Hannover, Germany
Tel: +49-511-762-17121, Fax: +49-511-762-5861
E-Mail: email@hidden
WWW: http://www.aei.mpg.de/~hewitson
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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