malloc-history | 易学教程

iPhone - debugging “pointer being freed was not allocated” errors

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问题 When over freeing a pointer you may see an error such as "pointer being freed was not allocated" When debugging with the simulator, I add a build argument MallocStackLogging = YES - this allows me to use malloc_history in the terminal to track down where I have over freed a pointer. If I debug on the device with this build argument I get all sorts of console errors "cannot create stack log files" etc. Oddly, I get some over freed pointer errors appearing on the device, but not on the

malloc_history cannot examine process xxxxxx because the process does not exist in iOS

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问题 I added the below environment variables to my Project and set their values to YES. NSDebugEnabled NSZombieEnabled MallocStackLogging MallocStackLoggingNoCompact I followed the Procedures in http://www.cocoadev.com/index.pl?DebuggingAutorelease I was able to find the Problem based on the Log generated. My doubt is when I tried to find the stack trace to find where the object was allocated, I got the below information: malloc_history cannot examine process 6963 because the process does not

malloc_history cannot examine process xxxxxx because the process does not exist in iOS

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I added the below environment variables to my Project and set their values to YES. NSDebugEnabled NSZombieEnabled MallocStackLogging MallocStackLoggingNoCompact I followed the Procedures in http://www.cocoadev.com/index.pl?DebuggingAutorelease I was able to find the Problem based on the Log generated. My doubt is when I tried to find the stack trace to find where the object was allocated, I got the below information: malloc_history cannot examine process 6963 because the process does not exist. Am I missing anything here? Below is the Log Created: UPDATE: I found the below link to be a good

Understanding a malloc_history dump

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问题 If you have ever asked how can I debug releasing/alloc issues in objective-c, you will have came across these environment settings that can help track the problem down: NSZombieEnabled - Keeps abjects around after release, so you can get pointers etc. MallocStackLogging - keeps object history for reference later NSDebugEnabled You set all of these to YES in the 'environment' section of the 'arguments' tab in the 'executables' (found in group tree) info. So, Im getting this console output