Question

我的应用程序在调试模式下通过Xcode运行良好，但无论何时通过TestFlight下载，它都会因此错误崩溃：EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x000200013f7b9e78。

这条线正在崩溃。我在这个堆栈跟踪中看到specialized Array.withUnsafeMutableBufferPoint，它可能与之相关。

self.array.sortInPlace. {
                (($0 as Dictionary<String, AnyObject>)["time"] as? String) > (($1 as Dictionary<String, AnyObject>)["time"] as? String)
            }

在Swift 1.3中我使用sort，现在在Swift 2中我使用sortInPlace。不确定这是否有所不同，但我知道sort的结果未被调用，因为它是不可变的。

Thread : Crashed: com.apple.main-thread
    0  libswiftCore.dylib             4302688056 _swift_retain_(swift::HeapObject*) + 8
    1  App                          4295962040 specialized LiveFeedViewController.(viewDidLoad(LiveFeedViewController) -> () -> ()).(closure #3).(closure #1) (LiveFeedViewController.swift)
    2  App                          4295785356 specialized thunk (LiveFeedViewController.swift)
    3  App                          4295953880 specialized _siftDown<A where ...> (inout A, A.Index, Range<A.Index>, inout (A.Generator.Element, A.Generator.Element) -> Bool) -> () (LiveFeedViewController.swift)
    4  App                          4295952448 specialized _heapSort<A where ...> (inout A, Range<A.Index>, inout (A.Generator.Element, A.Generator.Element) -> Bool) -> () (LiveFeedViewController.swift)
    5  App                          4295938144 specialized _introSortImpl<A where ...> (inout A, Range<A.Index>, inout (A.Generator.Element, A.Generator.Element) -> Bool, Int) -> () (LiveFeedViewController.swift)
    6  App                          4295938120 specialized _introSortImpl<A where ...> (inout A, Range<A.Index>, inout (A.Generator.Element, A.Generator.Element) -> Bool, Int) -> () (LiveFeedViewController.swift)
    7  App                          4295938120 specialized _introSortImpl<A where ...> (inout A, Range<A.Index>, inout (A.Generator.Element, A.Generator.Element) -> Bool, Int) -> () (LiveFeedViewController.swift)
    8  App                          4295938120 specialized _introSortImpl<A where ...> (inout A, Range<A.Index>, inout (A.Generator.Element, A.Generator.Element) -> Bool, Int) -> () (LiveFeedViewController.swift)
    9  App                          4295938120 specialized _introSortImpl<A where ...> (inout A, Range<A.Index>, inout (A.Generator.Element, A.Generator.Element) -> Bool, Int) -> () (LiveFeedViewController.swift)
    10 App                          4295938120 specialized _introSortImpl<A where ...> (inout A, Range<A.Index>, inout (A.Generator.Element, A.Generator.Element) -> Bool, Int) -> () (LiveFeedViewController.swift)
    11 App                          4295938120 specialized _introSortImpl<A where ...> (inout A, Range<A.Index>, inout (A.Generator.Element, A.Generator.Element) -> Bool, Int) -> () (LiveFeedViewController.swift)
    12 App                          4295938120 specialized _introSortImpl<A where ...> (inout A, Range<A.Index>, inout (A.Generator.Element, A.Generator.Element) -> Bool, Int) -> () (LiveFeedViewController.swift)
    13 App                          4295938120 specialized _introSortImpl<A where ...> (inout A, Range<A.Index>, inout (A.Generator.Element, A.Generator.Element) -> Bool, Int) -> () (LiveFeedViewController.swift)
    14 App                          4295938120 specialized _introSortImpl<A where ...> (inout A, Range<A.Index>, inout (A.Generator.Element, A.Generator.Element) -> Bool, Int) -> () (LiveFeedViewController.swift)
    15 App                          4295960640 specialized specialized MutableCollectionType<A where ...>.sortInPlace<A where ...>((A.Generator.Element, A.Generator.Element) -> Bool) -> () (LiveFeedViewController.swift)
    16 App                          4295730388 _TPA__TTSg5GSaGVSs10DictionarySSPSs9AnyObject___GSaGS_SSPS0____Ss21MutableCollectionTypeSs_GVSs17IndexingGeneratorGSaGS_SSPS0_____GS2_GSaGS_SSPS0_____Ss13GeneratorTypeSs_GS_SSPS0____SiSiSs21RandomAccessIndexTypeSs_SiSiSs18_SignedIntegerTypeSs_SiSiSs33_BuiltinIntegerLiteralConvertibleSs_SiSiSs16SignedNumberTypeSs_SiSiS6_Ss_Si_GVSs10ArraySliceGS_SSPS0____GS8_GS_SSPS0____Ss9IndexableSsGS8_GS_SSPS0____Ss12SequenceTypeSs_GS2_GS8_GS_SSPS0_____GS2_GS8_GS_SSPS0_____S3_Ss_GS_SSPS0____SiSiSs16ForwardIndexTypeSs_SiSiS5_Ss_SiSiS6_Ss_Si_GS8_GS_SSPS0_____GS_SSPS0____GS_SSPS0______TFFeRq_Ss21MutableCollectionTypeqq_Ss16MutableIndexable5IndexSs21RandomAccessIndexType_SsS_11sortInPlaceuRq_S_qq_S0_5IndexS1__FRq_FFTqqq_Ss14CollectionType9GeneratorSs13GeneratorType7Elementqqq_S2_9GeneratorS3_7Element_SbT_U_FTGVSs20UnsafeMutablePointerQQQPS_9Generator7Element_Si_T_ (LiveFeedViewController.swift)
    17 App                          4295730548 _TPA__TTSg5GSaGVSs10DictionarySSPSs9AnyObject___GSaGS_SSPS0____Ss21MutableCollectionTypeSs_GVSs17IndexingGeneratorGSaGS_SSPS0_____GS2_GSaGS_SSPS0_____Ss13GeneratorTypeSs_GS_SSPS0____SiSiSs21RandomAccessIndexTypeSs_SiSiSs18_SignedIntegerTypeSs_SiSiSs33_BuiltinIntegerLiteralConvertibleSs_SiSiSs16SignedNumberTypeSs_SiSiS6_Ss_Si_GVSs10ArraySliceGS_SSPS0____GS8_GS_SSPS0____Ss9IndexableSsGS8_GS_SSPS0____Ss12SequenceTypeSs_GS2_GS8_GS_SSPS0_____GS2_GS8_GS_SSPS0_____S3_Ss_GS_SSPS0____SiSiSs16ForwardIndexTypeSs_SiSiS5_Ss_SiSiS6_Ss_Si_GS8_GS_SSPS0_____GS_SSPS0____GS_SSPS0______TTRGRq_Ss21MutableCollectionTypeqq_Ss16MutableIndexable5IndexSs21RandomAccessIndexType_XFo_dGVSs20UnsafeMutablePointerqqq_Ss14CollectionType9GeneratorSs13GeneratorType7Element_dSi_dT_zoPSs9ErrorType__XFo_dGS2_qqq_S3_9GeneratorS4_7Element_dSi_iT_zoPS5___ (LiveFeedViewController.swift)
    18 App                          4295730716 _TPA__TTSg5GVSs10DictionarySSPSs9AnyObject___T____TFFSa42_withUnsafeMutableBufferPointerIfSupportedu__rFRGSaq__FzFzTGVSs20UnsafeMutablePointerq__Si_qd__GSqqd___U_FzRGVSs26UnsafeMutableBufferPointerQd___Q_ (LiveFeedViewController.swift)
    19 App                          4295954668 specialized Array.withUnsafeMutableBufferPointer<A><B>((inout UnsafeMutableBufferPointer<A>) throws -> B) throws -> B (LiveFeedViewController.swift)
    20 App                          4295959880 specialized specialized MutableCollectionType<A where ...>.sortInPlace<A where ...>((A.Generator.Element, A.Generator.Element) -> Bool) -> () (LiveFeedViewController.swift)
    21 App                          4295895596 LiveFeedViewController.(viewDidLoad(LiveFeedViewController) -> () -> ()).(closure #3) (LiveFeedViewController.swift:1862)
    22 libdispatch.dylib              6875551464 _dispatch_call_block_and_release + 24
    23 libdispatch.dylib              6875551400 _dispatch_client_callout + 16
    24 libdispatch.dylib              6875573680 _dispatch_main_queue_callback_4CF + 1844
    25 CoreFoundation                 6518931960 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
    26 CoreFoundation                 6518923360 __CFRunLoopRun + 1628
    27 CoreFoundation                 6518066336 CFRunLoopRunSpecific + 384
    28 GraphicsServices               6704955528 GSEventRunModal + 180
    29 UIKit                          6609391612 UIApplicationMain + 204
    30 App                          4296344512 main (AppDelegate.swift:23)
    31 libdyld.dylib                  6875752632 start + 4

更新：

这完全在Swift 2中，数组是一个字典数组，声明为var array = [[String:AnyObject]]()。它是通过添加一系列字典来填充的。

self.dict["foo"] = 0
self.dict["bar"] = "dog"
self.array.append(self.dict)

我担心的是它在dispatch_group_notify之内;它等待dispatch_group_leave系列。这可能与它有关吗？看起来像这样：

dispatch_group_notify(group, queue) { () -> Void in

      self.array.sortInPlace {
          (($0["foo"] as? Int) > (($1 )["foo"] as? Int))
      }
}

Answer 1

我遇到了同样的问题，但它只会影响约50％的设备，只会影响运行该应用的发布版本的设备。我的代码没有使用dispatch_group。

之类的内容

就我而言，我使用的代码如下：

contacts.sortInPlace({ $0.name.localizedCaseInsensitiveCompare($1.name) == .OrderedAscending })

当我用以下内容替换它时，它已得到修复：

contacts = contacts.sort({ $0.name.localizedCaseInsensitiveCompare($1.name) == .OrderedAscending })

由于它只影响有限数量的用户，在低级Swift API中崩溃，并且通过替换为sort来修复，我相信这是Apple代码中的错误。

我建议filing a bug with Apple并在此期间使用sort。

注意：您的代码与我的代码之间的另一个相似之处是使用shorthand argument names（即$ 0和$ 1）。但是，即使我用命名参数替换它们，它仍然会崩溃。

更新：很多人都是experiencing the same issue on the apple forums。根据该线程，它似乎在最新的Xcode beta中得到修复。

Answer 2

这是一个老问题，但在调试运行中难以重现EXC_BAD_ACCESS KERN_INVALID_ADDRESS的主要原因是因为调试版本和发行版本中解除分配对象的生命周期不同。在后者中，内存立即消失，可能会被一个不相关的对象取代，而在前者中，内存可能会保留一段时间，因此您的应用程序仍可以毫无问题地进行查看。此外，当发布版本中发生这种情况时，崩溃跟踪的最后一行可能会造成混淆，因为引用的对象可能是某种完全不相关的类型。如果是这种情况，我们应该在堆栈树中查找一下，希望能在那里找到更多线索。

Answer 3

我遇到这个错误的一个案例是我在Objective-C中声明了一个非空属性但是忘了初始化它，然后尝试在Swift中使用它。

EXC_BAD_ACCESS KERN_INVALID_ADDRESS崩溃

3 个答案: