崩溃+（UIImage *）imageWithData：（NSData *）数据规模：（CGFloat）规模在iOS 8上EXC_BAD_ACCESS UNKNOWN或KERNEL_INVALID_ADDRESS

Question

我的应用程序的前2个崩溃发生在以下方法：

+ (UIImage *)imageWithData:(NSData *)data scale:(CGFloat)scale

到目前为止，已发生超过2000次，根据崩溃报告显示的方式略有不同：

EXC_BAD_ACCESS KERN_INVALID_ADDRESS at 0x00000004
Thread : Crashed: com.apple.main-thread
0  ImageIO                        0x27b6a1b6 CGImagePlusSetImageBlockProc + 41
1  libsystem_malloc.dylib         0x34a5139b calloc + 58
2  ImageIO                        0x27b671c5 initImagePng + 4492
3  ImageIO                        0x27b65a2f makeImagePlus + 930
4  ImageIO                        0x27b65271 CGImageSourceCreateImageAtIndex + 160
5  UIKit                          0x2a1e0bf3 _UIImageRefFromData + 262
6  UIKit                          0x2a32d191 -[UIImage(UIImagePrivate) _initWithData:preserveScale:cache:] + 76
7  UIKit                          0x2a1e0ae5 -[UIImage initWithData:] + 28
8  UIKit                          0x2a2a36af -[UIImage initWithData:scale:] + 22
9  UIKit                          0x2a32b721 +[UIImage imageWithData:scale:] + 56

EXC_BAD_ACCESS KERN_INVALID_ADDRESS at 0x00000000
Thread : Crashed: com.apple.main-thread
0  CoreFoundation                 0x25bca41c CFArrayGetCount + 23
1  ImageIO                        0x26c3898b getImagePlus + 118
2  ImageIO                        0x26c3898b getImagePlus + 118
3  ImageIO                        0x26c38433 makeImagePlus + 46
4  ImageIO                        0x26c37fed CGImageSourceCreateImageAtIndex + 160
5  UIKit                          0x292954c3 _UIImageRefFromData + 282
6  UIKit                          0x293e1ad9 -[UIImage(UIImagePrivate) _initWithData:preserveScale:cache:] + 76
7  UIKit                          0x292953a5 -[UIImage initWithData:] + 28
8  UIKit                          0x29357ee7 -[UIImage initWithData:scale:] + 22
9  UIKit                          0x293e0081 +[UIImage imageWithData:scale:] + 56 

EXC_BAD_ACCESS UNKNOWN at 0x0000000104f44000
Thread : Crashed: com.apple.main-thread
0  libsystem_platform.dylib       0x0000000194795390 _platform_memmove + 320
1  libsystem_c.dylib              0x0000000194690424 __memcpy_chk + 32
2  libsystem_c.dylib              0x0000000194690424 __memcpy_chk + 32
3  ImageIO                        0x0000000184a3172c _CGImageSourceBindToPlugin + 316
4  ImageIO                        0x0000000184a31574 CGImageSourceGetCount + 112
5  UIKit                          0x000000018816d46c _UIImageRefFromData + 276
6  UIKit                          0x00000001882d1c20 -[UIImage(UIImagePrivate) _initWithData:preserveScale:cache:] + 112
7  UIKit                          0x000000018823e21c -[UIImage initWithData:scale:] + 32
8  UIKit                          0x00000001882cffa4 +[UIImage imageWithData:scale:] + 72 

我没看到我的代码如何影响这个，但我尝试将nil发送给这个方法，它只返回nil。损坏的NSData会导致此崩溃吗？此方法是否保留NSData？这条线路正在处理时是否会释放NSData？我不这么认为，因为它是同步的，对吗？

除此之外，我无法重现这个错误，但由于我们拥有庞大的用户群，因此经常发生这种情况。我还注意到它在iOS 8上发生了99％的次数。

非常感谢任何帮助。

Answer 1

您使用的是AFNetwork或Hanekee图书馆吗？由于ios8 UIImage imageWithData，我刚刚向这两个库提交了一个pull请求。似乎UIImage与数据不是线程安全的，这意味着从不同的线程同时调用它会崩溃....复制它的方法是测试以下代码：

let data = NSData(contentsOfURL: NSURL(string: "https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcTf4P0V2TrszykwPguyeulcSt4vwQPcvvWKKq_RePhUUVFoHevG9lw8GVcw")!)
    var test: Array<UIImage> = []
    let lock = NSLock()
    for i in 0...10000 {
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), { () -> Void in
            NSLog("Processing \(i)")
            let a = UIImage(data:data!)
            NSLog("Processed \(i)")
            lock.lock()
            test.append(a!)
            test.removeLast()
            lock.unlock()
        })

因此，请确保同步UIImage（数据：数据！）或[UIImage imageWithData：data]调用以避免同时调用。

拉请求：

Haneke：https://github.com/Haneke/HanekeSwift/pull/207

AFNetwork：https://github.com/AFNetworking/AFNetworking/pull/2815