Re: does this crash make sense to anyone?
Re: does this crash make sense to anyone?
- Subject: Re: does this crash make sense to anyone?
- From: "email@hidden" <email@hidden>
- Date: Fri, 19 Dec 2008 15:22:54 +0100
Thank you. I have read up on NSZombie et al and found a non-retained
object that may have been the culprit, although it's too early to say
definitely. I'll keep investigating...
Cheers
On Thu, Dec 18, 2008 at 8:49 PM, Shawn Erickson <email@hidden> wrote:
> On Thu, Dec 18, 2008 at 11:45 AM, Shawn Erickson <email@hidden> wrote:
>> On Thu, Dec 18, 2008 at 11:33 AM, email@hidden
>> <email@hidden> wrote:
>>> Hi,
>>>
>>> my app keeps annoying me by crashing at launch every now and then.
>>> What's weird about the backtrace is that it tells me I have called a
>>> CLASS method named setFrame:. The class varies: in this case it says
>>> NSClipView, sometimes is says NSAttributedString, or NSObject, or
>>> whatever. Of course, I don't make any such calls explicitly, and most
>>> of the time the app launches just fine. Any idea what the problem
>>> could be, or how to locate it with gdb? I never learned using the
>>> debugger properly.
>>
>> This is indicative of not correctly retaining an object (likely an
>> object given to you that you then stick into an instance var without
>> taking "ownership" of it) . As a result the object is deallocated out
>> from under you (likely as a result of the currently auto release pool
>> being drained) and then that slot in memory is randomly replaced with
>> a different object instance likely of a totally unrelated class.
>>
>> You can use NSZombie to help isolate...
>>
>> http://developer.apple.com/technotes/tn2004/tn2124.html
>
> I should note it could also be because you are releasing an object
> that you shouldn't be releasing. Normally an over release would fail
> in a different way (crash in a future release message) but it is
> possible to get what you are seeing because of an over release in
> addition to an under release situation.
>
> If this is a GC using application then the issue will be different.
>
> -Shawn
>
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