Objc memory crash with autorelase

I have been hunting all over my code and can't find the source of this crash: I am trying to decode an object with an NSKeyedUnarchiver and it crashes on it every time and says:

*** __NSAutoreleaseFreedObject(): release of previously deall开发者_如何转开发ocated object (0x1008ad200) ignored
*** __NSAutoreleaseFreedObject(): release of previously deallocated object (0x1008ab200) ignored
*** __NSAutoreleaseFreedObject(): release of previously deallocated object (0x1008a8c00) ignored

Ha my bad the reason why initWithCoder was not getting called was it was having issues with the [super initWithCoder:]; This is still driving me crazy. I looked and the pointers and the NSData objects are what are going wrong:

    vertices = malloc(size_point3D * vertexCount);
    textureCoords = malloc(size_point2D * textureCount);
    normals = malloc(size_point3D * normalCount);
    faces = malloc(sizeof(GLuint) * faceCount);


    NSData *vertexData = [[NSData alloc] initWithData:[coder decodeObjectForKey:@"vertices"]];
    NSData *textureData = [[NSData alloc] initWithData:[coder decodeObjectForKey:@"textureCoords"]];
    NSData *normalData = [[NSData alloc] initWithData:[coder decodeObjectForKey:@"normals"]];
    NSData *faceData = [[NSData alloc] initWithData:[coder decodeObjectForKey:@"faces"]];


    memcpy(vertices, [vertexData bytes],  sizeof(point3D) * vertexCount);
    memcpy(textureCoords, [textureData bytes], sizeof(point2D) * textureCount);
    memcpy(normals, [normalData bytes], sizeof(point3D) * normalCount);
    memcpy(faces, [faceData bytes], sizeof(GLuint) * faceCount);

    [vertexData release];
    [textureData release];
    [normalData release];
    [faceData release];

I have tried retaining everything in this part (even the string) but it does not help.

This was a hard one to solve partly because debugging memory behaves inconsistently.

I have 2 classes JGStaticModel and JGModel. For some reason, the unarchiver would pick one of those at random so sometimes initWithCoder was sent to JGModel and not JGStaticModel. This led me to think it was not being called. Also since their structure is slightly different it had issues and crashed. The reason why I got the autorelease problem was I patched some memory problems in JGStaticModel but not JGModel so it would crash on the memory because I had not fixed it there.

Thanks for all the help!

Try turning on NSZombieEnabled, this should help you track down the problem.

If neither tools (Run -> Run with Performance tools) and NSZombiesEnabled helps, you can override - (id)retain and - (void)release methods of the class that caused the exception. Call super implementation and log retain/release. You can break in this methods to see the call stack. This way isn't beautiful, however, it helped me few time to figure out where was an extra release/autorelease call

This problem is very easy to solve with the solution given here.

The relevant part is:

If an environment variable named "NSAutoreleaseHaltOnFreedObject" is set with string value "YES", the function will automatically break in the debugger