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I've a memory issue in an iPhone app that I'd like to debug with MallocStackLogging . The error involves the gyroscope so I have to debug on the device not the simulator. I've set the MallocStackLogging environment variable and the iPhone properly records the mallock stack logs: MyApp(1856) malloc: recording malloc stacks to disk using standard recorder MyApp(1856) malloc: stack logs being written into /private/var/mobile/Applications/1FD1F8D2-5D30-4AA7-B426-C52FE20266DE/tmp/stack-logs.1856.MyApp.index MyApp(1856) malloc: Please issue: cp /private/var/mobile/Applications/1FD1F8D2-5D30-4AA7- B426-C52FE20266DE/tmp/stack-logs.1856.MyApp.e8z3IL.link /tmp/ Now how can I work with them? I can transfer them to the Mac using the Xcode Organizer. But what should I do with these two files? stack-logs.1856.MyApp.index stack-logs.1856.MyApp.e8z3IL.link I tried moving the files in /tmp on the Mac and called: $ malloc_history 1856 -all_events malloc_history cannot exa