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Re: Just implementing -isEqual:, never invoked, causes crash
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Re: Just implementing -isEqual:, never invoked, causes crash


  • Subject: Re: Just implementing -isEqual:, never invoked, causes crash
  • From: Jerry Krinock <email@hidden>
  • Date: Fri, 19 Jun 2009 09:18:02 -0700

<Skipping all the quotes for brevity ... Thanks!>

I don't "turn on zombies" very often, so, just to make sure I did it correctly, I "turned on zombies" by activating this code in my main()...

#define KEEP_ZOMBIES
#ifdef KEEP_ZOMBIES
    setenv("NSZombieEnabled", "YES", 1) ;
    setenv("NSAutoreleaseFreedObjectCheckEnabled", "YES", 1) ;
#endif

That should do the job, right?

It still crashes with this on, and still crashes in different places. Actually, having sat through about 25 crashes now, I see that there are about 5 different places where the crash can occur. Here's the top of the call stack on the most prevalent crash:

#0 0x9447b688 in objc_msgSend
#1 0x91e23852 in -[_PFContextMapTable setForUseWithModel:]
#2 0x91e23166 in -[NSManagedObjectContext setPersistentStoreCoordinator:]
#3 0x93289c66 in -[NSPersistentDocument managedObjectContext]
#4 0x00310866 in -[Bookshelf initializeCommon] at Bookshelf.m:253
#5 0x00310b87 in -[Bookshelf init] at Bookshelf.m:321


As you can see, the last thing I do there is get the - managedObjectContext of my NSPersistenDocument of subclass Bookshelf. But I haven't touched that code in months. It must be a smasher.

Usually, nothing is logged the console except the gdb splash/license. One time, though, I got this "all hell broke loose":
*** -[NSUndoManager entitiesByName]: unrecognized selector sent to instance 0x2571ad0
*** -[NSUndoManager entitiesByName]: unrecognized selector sent to instance 0x2571ad0
*** -[NSAttributeStoreMapping entityVersionHashesByName]: unrecognized selector sent to instance 0x16950c70
*** -[NSAttributeStoreMapping entityVersionHashesByName]: unrecognized selector sent to instance 0x16950c70
*** -[NSCFArray _entityForName:]: unrecognized selector sent to instance 0x16926e40
*** -[NSCFArray _entityForName:]: unrecognized selector sent to instance 0x16926e40


As expected, correcting the signature of my -isEqual: to take id as an argument instead of Browfile* did not help.

Again, I "touched" all the files, rebuilt everything, and didn't get any warnings of multiple method implementations.

That's all I can think of to try, Michael! But I am thinking hard as you read this.

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  • Follow-Ups:
    • Re: Just implementing -isEqual:, never invoked, causes crash
      • From: Kyle Sluder <email@hidden>
    • Re: Just implementing -isEqual:, never invoked, causes crash
      • From: Chris Parker <email@hidden>
References: 
 >Just implementing -isEqual:, never invoked, causes crash (From: Jerry Krinock <email@hidden>)
 >Re: Just implementing -isEqual:, never invoked, causes crash (From: Michael Ash <email@hidden>)

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