On Jan 14, 2014, at 9:05 PM, Quincey Morris <quinceymor...@rivergatesoftware.com> wrote: > >> On Jan 14, 2014, at 18:34 , Gideon King <gid...@novamind.com> wrote: >> >> Although it is always happening at the same point in the code, I really have >> no idea where to look for debugging it. > > I have no answers, but a couple of observations. > > First, you seem to be crashing in the dealloc (or destructor, if it’s a C++ > class) of class OUIInspectorPane. I’d suggest you focus on properties of that > class whose value is a weak object reference.
Gah. We tried _so hard_ to find this bug before shipping our iOS 7 apps. We still have no idea what causes it, but it always seems to happen in the ARC-generated autodestructor of an OUIInspectorPane. Can you describe the contents of your inspectors? For a while we had a hunch it involved some OmniOutliner-specific piece of UI. > > Second, I’ve noticed some very surprising behavior with weak references at > dealloc time. If an object being deallocated has a weak reference to another > object, and it was the only reference so that the other object is also due to > be deallocated, then (IIRC) the weak reference variable isn’t nil — and the > referenced object’s dealloc hasn’t run yet — but you can’t send a message to > the object via the weak reference because it’s marked as being in > deallocation. Something like that. > > I wish I remember the circumstances more clearly, but the takeaway was that > it’s unsafe to try to clean up objects referred to via weak references *at > the referrer’s dealloc time*. You might have to change it to a strong > reference (and break the reference cycle somewhere), or do the cleanup before > you get to the referrer’s dealloc. We shouldn't be doing any of this, but I'll forward this message up the chain. Thanks for all the help. --Kyle Sluder _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
