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: "Shawn Erickson" <email@hidden>
- Date: Thu, 18 Dec 2008 11:45:01 -0800
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
-Shawn
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