通过Xcode 7中新的Address Sanitizer功能运行我的应用程序时遇到了一个问题我无法理解：
我试图从这样的NSImage初始化中等大小（588x375）纹理
NSImage *texture = [[NSBundle bundleForClass:self.class] imageForResource:@"ground_texture"];
NSBitmapImageRep *bitmap = (NSBitmapImageRep *)[texture bestRepresentationForDevice:@{
NSDeviceColorSpaceName: NSCalibratedRGBColorSpace,
NSDeviceBitsPerSample: @8,
NSDeviceIsScreen: @"YES"
}];
unsigned char* imageRepBitmapData = bitmap.bitmapData;
一旦执行到达代码示例的最后一行，我就得到AsanDie抱怨堆栈缓冲区溢出这个堆栈跟踪（运行10.11.1 beta）：
==5070==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61300061f8f4 at pc 0x0001000d1c34 bp 0x7fff5fbfbcd0 sp 0x7fff5fbfb488
READ of size 384 at 0x61300061f8f4 thread T0
==5070==WARNING: Can't read from symbolizer at fd 14
#0 0x1000d1c33 in wrap_memmove (/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/7.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x39c33)
#1 0x7fff92e1c98c in -[_NSInlineData initWithBytes:length:] (/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation+0xc98c)
#2 0x7fff92e1c4f6 in -[_NSPlaceholderData initWithBytes:length:copy:deallocator:] (/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation+0xc4f6)
#3 0x7fff92e1c954 in -[NSData(NSData) initWithBytes:length:] (/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation+0xc954)
#4 0x7fff92e28800 in +[NSData(NSData) dataWithBytes:length:] (/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation+0x18800)
#5 0x7fff923733eb in -[NSBitmapImageRep _fromCGImage:performBlockUsingMutableData:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x2503eb)
#6 0x7fff925d0094 in __79-[NSBitmapImageRep _withoutChangingBackingPerformBlockUsingBackingMutableData:]_block_invoke_2 (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x4ad094)
#7 0x7fff922c2093 in __75-[NSBitmapImageRep _withoutChangingBackingPerformBlockUsingBackingCGImage:]_block_invoke (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x19f093)
#8 0x7fff922c16f8 in -[NSBitmapImageRep _withoutChangingBackingPerformBlockUsingBackingCGImage:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x19e6f8)
#9 0x7fff921a0e96 in __79-[NSBitmapImageRep _withoutChangingBackingPerformBlockUsingBackingMutableData:]_block_invoke (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x7de96)
#10 0x7fff921a0d9b in -[NSBitmapImageRep _withoutChangingBackingPerformBlockUsingBackingMutableData:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x7dd9b)
#11 0x7fff921a0d16 in __57-[NSBitmapImageRep _performBlockUsingBackingMutableData:]_block_invoke (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x7dd16)
#12 0x7fff921a0c8a in -[NSBitmapImageRep _performBlockUsingBackingMutableData:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x7dc8a)
#13 0x7fff921a0c17 in -[NSBitmapImageRep getBitmapDataPlanes:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x7dc17)
#14 0x7fff921a0b9e in -[NSBitmapImageRep bitmapData] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x7db9e)
有了这个分配线索：
0x6130005d59f4 is located 0 bytes to the right of 372-byte region [0x6130005d5880,0x6130005d59f4)
allocated by thread T0 here:
#0 0x1000dabb0 in wrap_malloc (/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/7.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x42bb0)
#1 0x7fff92372c42 in -[NSBitmapImageRep _fromCGImage:performBlockUsingMutableData:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x24fc42)
#2 0x7fff925d0094 in __79-[NSBitmapImageRep _withoutChangingBackingPerformBlockUsingBackingMutableData:]_block_invoke_2 (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x4ad094)
#3 0x7fff922c2093 in __75-[NSBitmapImageRep _withoutChangingBackingPerformBlockUsingBackingCGImage:]_block_invoke (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x19f093)
#4 0x7fff922c16f8 in -[NSBitmapImageRep _withoutChangingBackingPerformBlockUsingBackingCGImage:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x19e6f8)
#5 0x7fff921a0e96 in __79-[NSBitmapImageRep _withoutChangingBackingPerformBlockUsingBackingMutableData:]_block_invoke (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x7de96)
#6 0x7fff921a0d9b in -[NSBitmapImageRep _withoutChangingBackingPerformBlockUsingBackingMutableData:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x7dd9b)
#7 0x7fff921a0d16 in __57-[NSBitmapImageRep _performBlockUsingBackingMutableData:]_block_invoke (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x7dd16)
#8 0x7fff921a0c8a in -[NSBitmapImageRep _performBlockUsingBackingMutableData:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x7dc8a)
#9 0x7fff921a0c17 in -[NSBitmapImageRep getBitmapDataPlanes:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x7dc17)
#10 0x7fff921a0b9e in -[NSBitmapImageRep bitmapData] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x7db9e)
#11 0x1026e788c in -[MyOpenGLRenderingThingie loadTexture:intoTexture:] (/Users/me/Library/Developer/Xcode/DerivedData/...)
所以基本上深入了解AppKit。
任何想法可能是什么......？