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Editorial Team
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Asked: 2026-06-15T15:04:51+00:00

char bytes[] = { 1, 2, 3, 4}; NSString * f = [[NSString alloc]

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char bytes[] = { 1, 2, 3, 4};
NSString * f = [[NSString alloc] initWithBytes:bytes length:4 encoding:NSASCIIStringEncoding];

[f release];

NSLog(@"%@", [f description]); // Why no 'message sent to deallocated instance "?

[f release];

It only give me warning only, no crash..

Test1(26194,0xacf302c0) malloc: *** error for object 0x757c2f0: double free
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1 Answer

  1. Editorial Team

    Because NSString is weird. (It’s a class cluster, and it’s toll-free-bridged to CFString.)

    Try the same thing with a more ordinary object (like NSObject, for the simplest possible case) and you’ll see things behaving more as expected. (But note that you will probably not get a “message sent to deallocated instance” error at all unless you enable guard malloc or a similar debug option.)

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