ios - 崩溃 + (UIImage *)imageWithData :(NSData *)data scale:(CGFloat)scale on iOS 8 | EXC_BAD_ACCESS UNKNOWN or KERNEL_INVALID_ADDRESS

Question

我的应用程序的前 2 次崩溃发生在以下方法中:

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

到目前为止，它已经发生了 2000 多次，根据崩溃报告，它以稍微不同的方式表现出来:

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 

我看不出我的代码会如何影响这个，但我尝试将 nil 发送到此方法，但它只返回 nil。损坏的 NSData 会导致这次崩溃吗？此方法是否保留 NSData？会不会是因为在处理这条线时释放了 NSData？我不这么认为，因为它是同步的，对吗？

除此之外，我无法重现此错误，但由于我们拥有庞大的用户群，它经常发生。我还注意到它发生在 iOS 8 上的次数为 99%。

任何帮助将不胜感激。

Answer 1

您使用的库是 AFNetwork 还是 Hanekee？由于 ios8 UIImage imageWithData，我刚刚向这两个库提交了拉取请求。似乎带有数据的 UIImage 不是线程安全的，这意味着从不同线程同时调用它会崩溃....复制它的一种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(data:data!) 或 [UIImage imageWithData:data] 调用以避免同时调用。

拉取请求:

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

AF 网络:https://github.com/AFNetworking/AFNetworking/pull/2815