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I'm having trouble with memory leaks. I want to get shader's reflection data from MTLFunction which is generated from precompiled shader files. These files are compiled with Metal Developer Tools for Windows 2.3 and I use the following command options. -x metal hoge.metal -std=ios-metal2.0 -o hoges.msl To get these reflection data, I use the function newArgumentEncoderWithBufferIndex:reflection:. I can get the reflection data, but some memory leaks occur for each call this function, and I don't know how to release the memory of the reflection data. This is a example code. void Func(id<MTLFunction> _pShaderFunc) { MTLAutoreleasedArgument reflection = nil; id<MTLArgumentEncoder> argEnc = [_pShaderFunc newArgumentEncoderWithBufferIndex:0 reflection:&reflection]; // some process... // [reflection release]; // run-time error. [argEnc release]; } I tested this on iPhone 11 Pro Max with iOS 13.3.1, Xcode 13.1, and Mac mini(2018) with macOS Monterey 12.4. I compiled source files specifying the option -fno-objc-arc. I used the instrument Leaks, and I confirmed when this function isn't called, there were no memory leaks. Could you give me some advice on how to resolve those leaks?