On Sep 7, 2012, at 3:55 PM, Jens Alfke wrote: > On Sep 7, 2012, at 12:01 PM, Richard Somers <rsomers...@awinets.com> wrote: > >> MyApp(469,0x1009fbcc0) malloc: *** error for object 0x12f6b19a0: pointer >> being freed was not allocated *** set a breakpoint in malloc_error_break to >> debug >> Following the instructions and adding a symbolic break point >> (malloc_error_break) results in nothing different. The application still >> halts at the same location with the same error. > > From the stack it looks like the environment variable MallocErrorAbort is > already set, so you’ve already stopped at the point of the error. > >> I have searched through every stack frame and can find no reference to the >> pointer in question 0x12f6b19a0. You would think that this pointer would be >> located somewhere in one of the stack frames. > > The only stack frame that would necessarily be referring to it is #3, > gfxReleaseSharedState — I don’t know if that’s your code or not. That > function has called free( ) on that pointer. > >> A po or p on the pointer in the debug console produces nothing useful. > > It isn't an Objective-C object, because gfxReleaseSharedState is directly > calling free() on it. > > I don’t have much more advice, because it looks like the code on the stack is > related to OpenGL, which I don’t know anything about. It’s possible you’ve > got the refcounting wrong for something GL-related, so that the ‘shared > state’ referred to has already been freed. > >> The stack looks like this: >> >> #0 0x00000001008700b6 in __kill () >> #1 0x00000001009109f6 in abort () >> #2 0x0000000100828195 in free () >> #3 0x00000001064c01b3 in gfxReleaseSharedState () >> #4 0x000000012cc3d91f in gliDestroyContext () >> #5 0x0000000100166de4 in CGLReleaseContext () >> #6 0x0000000100169faa in CGLDestroyContext () >> #7 0x000000010001468d in -[RSTriadLayer releaseCGLContext:] at >> RSTriadLayer.m:302
Jens, thanks for the help. I found the pointer. It appears in frame #2 free () and higher frames in one of the general purpose registers. One would think that the pointer would show up in frame #3 gfxReleaseSharedState () which calls free () but it does not. My code is frame #7 and #10 and everything else is from the frameworks. Yes, it appears this is some sort of OpenGL related memory management issue. --Richard _______________________________________________ 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
