EXC_BAD_ACCESS KERN_INVALID_ADDRESS崩溃

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,它都会因此错误而崩溃:EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x000200013f7b9e78.

它在这条线上崩溃了.我specialized Array.withUnsafeMutableBufferPoint在这个堆栈跟踪中看到它可能与之相关.

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

在我使用的Swift 1.3中sort,现在在Swift 2中我正在使用sortInPlace.不确定这是否有所作为,但我确实知道sort没有调用结果,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]]().它是通过附加一系列字典来填充的,就像这样.

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

我担心的是它在一个dispatch_group_notify; 它在等待系列的dispatch_group_leaves.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

这是一个老问题，但在调试运行中很难重现 EXC_BAD_ACCESS KERN_INVALID_ADDRESS 的主要原因是调试版本和发布版本中释放对象的生命周期不同。在后者中，内存会立即消失，并可能被不相关的对象替换，而在前者中，内存可能仍会保留一小段时间，因此您的应用程序仍然可以毫无问题地运行。此外，当这种情况在发布版本中发生时，崩溃跟踪的最后一行可能会令人困惑，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，并希望在那里找到更多线索。

Answer 2

我遇到了同样的问题，但它只影响约 50% 的设备，并且只影响那些运行应用程序发行版的设备。我的代码没有使用类似dispatch_group.

就我而言，我使用的代码如下：

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

当我将其替换为以下内容时已修复：

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，并通过替换为 修复sort，我相信这是 Apple 代码中的错误。

我建议向 Apple 提交错误并sort在此期间使用。

注意：您的代码和我的代码之间的另一个相似之处是使用速记参数名称（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：许多人在苹果论坛上遇到了同样的问题。根据该线程，它似乎已在最新的 Xcode beta 中修复。

Answer 3

关于更新中的代码：

由于数组是“手动”填充的，最可靠（有效且符合 Swift 类型安全性）的方法是使用具有非可选属性的自定义类，而不是通用字典。

class Item {
  var foo : Int
  var bar : String

  init(foo : Int, bar : String) {
    self.foo = foo
    self.bar = bar
  }
}

var array = [Item]()
array.append(Item(foo: 0, bar: "dog"))
array.append(Item(foo: 1, bar: "cat"))

array.sortInPlace { $0.foo > $1.foo }

所有类型都是众所周知的且非可选的。

没有类型转换，没有展开，没有开销，没有问题。