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Editorial Team
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Asked: 2026-06-10T02:26:32+00:00

I have an older app that does not use ARC. When trying to address

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I have an older app that does not use ARC. When trying to address a rather simple change, I got stuck on an annoying problem:

When running this:

NSMutableArray *arr=[[NSMutableArray alloc] initWithCapacity:0];
NSLog(@"arr=%08lx", (unsigned long)arr);
[arr release];

I get this in console:

arr=06a2ca50
*** -[__NSArrayM class]: message sent to deallocated instance 0x6a2ca50

The error comes immediately after single stepping over the release statement.

As I don’t recall seeing this before upgrading to 4.4.1, is there anything new in xcode 4.4.1 that explains the above?

Or am I just overseeing something very obvious in the above code?

Update: after downgrading to 4.3.3 the problem disappeared. Currently looking for what might be causing this. I couldn’t reproduce with a new/clean project.
Same problem with xcode 45-DP4 / iOS6..

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1 Answer

  1. Editorial Team

    The project file had NSZombieEnabled=YES in the environment variables of the debug scheme.

    I’m not sure why this warning occurs under 4.4.1+ with NSZombieEnabled=YES since none of the standard analyze and diagnostic tools report memory issues.

    If anyone has more insight as to why this warning occurs on 4.1.1+, I’m eager to learn. In general I’m keen in taking a compiler or debug warning serious and don’t see disabling them as the best option..

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