On Nov 17, 2009, at 1:04 PM, Aaron Clarke wrote: > We have an application that runs fine on leopard (10.5) but occasionally > crashes on snow leopard (10.6) when closing an NSWindow. Here is the > backtrace for the crash: > > Program received signal EXC_BAD_ACCESS, Could not access memory. > Reason: KERN_PROTECTION_FAILURE at address: 0x00000000 > 0x976e691b in objc_msgSend () > (gdb) bt > #0 0x976e691b in objc_msgSend () > #1 0x197142d0 in ?? () > #2 0x9031e88e in NSKeyValuePushPendingNotificationPerThread () > #3 0x9031e224 in NSKeyValueWillChange () > #4 0x9030350b in -[NSObject(NSKeyValueObserverNotification) > willChangeValueForKey:] () > #5 0x90327cfe in _NSSetObjectValueAndNotify () > #6 0x92745fb8 in -[NSWindow makeFirstResponder:] () > ... > > Even if it doesn't crash, closing the NSWindow always results in the > following error message. > > An instance 0x11b75230 of class MyWindow was deallocated while key value > observers were still registered with it. Observation info was leaked, and > may even become mistakenly attached to some other object. Set a breakpoint > on NSKVODeallocateBreak to stop here in the debugger. Here's the current > observation info: > <NSKeyValueObservationInfo 0x19408190> ( > <NSKeyValueObservance 0x194233d0: Observer: 0x463afa0, Key path: > firstResponder, Options: <New: YES, Old: NO, Prior: NO> Context: 0x0, > Property: 0x4453e60> > <NSKeyValueObservance 0x1ab6ad40: Observer: 0x19427a80, Key path: > firstResponder, Options: <New: YES, Old: NO, Prior: NO> Context: 0x0, > Property: 0x4453e60> > ) > > I looked at what the observer object's class is, and it's a subclass of > NSCollectionView. We do not explicitly setup a KVO relationship for > firstResponder. I also noticed that the "Application Kit Release Notes for > Snow Leopard" mention that firstResponder is KVO-compliant, which makes me > believe this is something new in Snow Leopard. All this information makes > me believe this is potentially a bug in Application Kit for 10.6. Maybe we > setup an NSCollectionView incorrectly or I'm misinterpreting this > information?
Your window might be doing something strange, and causing notifications to be suppressed some how. What code does MyWindow have in it? corbin _______________________________________________ Cocoa-dev mailing list ([email protected]) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
