ios - swift_unknownRelease 崩溃 - SwiftHTTP

Question

我突然开始观察到我的一个应用程序的新更新出现以下崩溃。它似乎经常发生，并且令人困惑，因为我在过去 6 个月内没有对代码的这一部分进行任何更改。我确实想知道 this (EXC_BAD_ACCESS 返回一个抛出的字典)如果崩溃是由于为此请求形成参数字典导致的，Swift 雷达错误可能是相关的。

更新此版本是使用 Swift 2.2 和 Xcode 7.3 创建的。 SwiftHTTP是 v1.0.4。我看到 iOS 8.3.0、9.3.0 和 9.3.1 上的生产二进制文件崩溃。这个问题在 iPhone 6、6 Plus 和 6s 上最为普遍 (87%)。我尝试使用 Xcode Zombies 重现此问题(根据 here )，但它没有在控制台中显示任何 message sent to deallocated instance 消息。

崩溃发生在我为 SwiftHTTP 提供的辅助类中执行 PUT 更新时图书馆。

错误

EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x0000000000000020 

堆栈跟踪

Thread : Crashed: com.apple.main-thread
0  libswiftCore.dylib             0x100d6d8f8 swift_unknownRelease + 24
1  SwiftHTTP                      0x100b07298    _TTSf4g_n___TTSg5Ps9AnyObject____TFE9SwiftHTTPSa11createPairsfGSqSS_GSaVS_8HTTPPair_ + 700
2  SwiftHTTP                      0x100b002f4 _TFE9SwiftHTTPVs10Dictionary11createPairsfGSqSS_GSaVS_8HTTPPair_ + 2000
3  SwiftHTTP                      0x100b00f90 _TTWu0_Rxs8HashablerGVs10Dictionaryxq__9SwiftHTTP21HTTPParameterProtocolS1_FS2_11createPairsfGSqSS_GSaVS1_8HTTPPair_ + 112
4  SwiftHTTP                      0x100b0178c _TFE9SwiftHTTPCSo19NSMutableURLRequest16appendParametersfzPS_21HTTPParameterProtocol_T_ + 396
5  SwiftHTTP                      0x100af14a4 _TTWV9SwiftHTTP23HTTPParameterSerializerS_21HTTPSerializeProtocolS_FS1_9serializefzTCSo19NSMutableURLRequest10parametersPS_21HTTPParameterProtocol__T_ + 40
6  SwiftHTTP                      0x100af8ccc _TTSf4gs_n_n_g_n_d___TZFC9SwiftHTTP4HTTP3NewfzTSS6methodOS_8HTTPVerb10parametersGSqPS_21HTTPParameterProtocol__7headersGSqGVs10DictionarySSSS__17requestSerializerPS_21HTTPSerializeProtocol__S0_ + 624
7  SwiftHTTP                      0x100af5758 _TZFC9SwiftHTTP4HTTP3PUTfzTSS10parametersGSqPS_21HTTPParameterProtocol__7headersGSqGVs10DictionarySSSS__17requestSerializerPS_21HTTPSerializeProtocol__S0_ + 76
8  MyApp                   0x1001274c0 SwiftHTTPUtilities.PUT(String, auth : String, params : [String : AnyObject]?, model : String, mode : APIUtilities.ApiRequestType, object : AnyObject?) -> () (SwiftHTTPUtilities.swift:52)
9  MyApp                   0x100154e90 APIUtilities.(apiRequest(String, mode : APIUtilities.ApiRequestType, object : AnyObject?) -> ()).(closure #3) (APIUtilities.swift:76)
10 MyApp                   0x100152f70 partial apply for APIUtilities.(apiRequest(String, mode : APIUtilities.ApiRequestType, object : AnyObject?) -> ()).(closure #3) (APIUtilities.swift)
11 libdispatch.dylib              0x18364d4bc _dispatch_call_block_and_release + 24
12 libdispatch.dylib              0x18364d47c _dispatch_client_callout + 16
13 libdispatch.dylib              0x183652b84 _dispatch_main_queue_callback_4CF + 1844
14 CoreFoundation                 0x183bb8dd8 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
15 CoreFoundation                 0x183bb6c40 __CFRunLoopRun + 1628
16 CoreFoundation                 0x183ae0d10 CFRunLoopRunSpecific + 384
17 GraphicsServices               0x1853c8088 GSEventRunModal + 180
18 UIKit                          0x188db5f70 UIApplicationMain + 204
19 MyApp                   0x10026d508 main (AppDelegate.swift:25)
20 libdispatch.dylib              0x18367e8b8 (Missing)

SwiftHTTPUtilities(这是一个与开源库交互的辅助类 SwiftHTTP)

    func PUT(apiPath: String, auth: String, params: Dictionary<String,AnyObject>?,model: String, mode: APIUtilities.ApiRequestType, object: AnyObject?) {        
            do {
//SYMBOLICATED CRASH REPORT IDENTIFIES BELOW LINE FOR EXC_BAD_ACCESS
                let opt = try HTTP.PUT("\(apiPath)", parameters: params, headers: ["*removed*"])
                opt.start { response in
                    if let err = response.error {
//                        print("error: \(err.localizedDescription)")
                        self.delegate?.didGetServerResponse(false, response: nil, error: response.error, model: model, mode: mode, object: object)
                        return //also notify app of failure as needed
                    }
//                    print("opt finished: \(response.description)")
                    //print("data is: \(response.data)") access the response of the data with response.data

                    self.delegate?.didGetServerResponse(true, response: response.data, error: nil, model: model, mode: mode, object: object)
                }
            } catch let error {
//                print("got an error creating the request: \(error)")
                self.delegate?.didGetServerResponse(false, response: nil, error: nil, model: model, mode: mode, object: object)
            }

    }

Answer 1

此问题是由于 SwiftHTTP 默认为 HTTPSerialisation。下面一行是如何指定 JSON 序列化，这为我修复了错误。

let opt = try HTTP.New("\(apiPath)", method: .PUT, parameters: params, headers: ["Authorization": "edit"], requestSerializer: JSONParameterSerializer())