how can I trace back beyond dispatch_async when debugging an iOS program? -


i wonder if knows how can trace beyond dispatch_async when debugging ios program. program constant crash @ 2 spots: in buffer_is_unused, shown in , , , in release_shmem_bitmap, shown in , . none of happens @ main thread, , on thread-local stack there nothing except dispatch_async , pthread jobs. given configuration of xcode, gives me no information on called dispatched_async. googled "release_shmem_bitmap" , found few webpage on web , none of them helpful. wonder if knows how can make xcode show called these dispatch_async or in general how shall fix such crash?


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