ios - 使用 iOS 5 启动时应用程序崩溃 - 无法重现

Question

对于一小部分用户，我们的 iOS 应用在启动时崩溃。

1. 我们无法在多个测试设备中的任何一个上重现此崩溃，无论是连接到 Xcode 还是未连接

2. 崩溃仅发生在 iOS 5 上，但发生在 iPod、iPhone 和 iPad 上

3. 崩溃是启动时看门狗超时

4. 只有少数用户遇到崩溃

5. 应用仅在用户升级时崩溃

6. 如果用户删除然后重新安装应用程序，崩溃将停止发生

7. 关闭设备再打开没有帮助

8. 项目中唯一使用的 XIB 是用于主窗口的基本为空的 XIB

如果有人知道这次崩溃的来源，我们当然会很感激。一个月来，我们一直试图追踪它，但没有成功。

非常感谢!

这是我们的应用程序:didFinishLaunchingWithOptions:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [self.window setBackgroundColor:[UIColor myBackgroundColor]];

    gRootViewController = [[RootViewController alloc] init];

    [self performSelectorOnMainThread:@selector(loadGame) withObject:nil waitUntilDone:NO];

    return YES;

}

这是符号化的崩溃日志:

Incident Identifier: 8AC99711-0817-4A93-AEFB-82E24FFE3291
Hardware Model:      iPhone3,1
Process:         myapp [92]
Path:            /var/mobile/Applications/B90DCE6D-F392-493E-8BC8-7FE0A64D80B0/myapp.app/myapp
Identifier:      myapp
Version:         ??? (???)
Code Type:       ARM (Native)
Parent Process:  launchd [1]

Date/Time:       2012-04-04 21:52:17.108 -0500
OS Version:      iPhone OS 5.1 (9B176)
Report Version:  104

Exception Type:  00000020
Exception Codes: 0x8badf00d
Highlighted Thread:  0

Application Specific Information:
com.mycompany.myapp failed to launch in time

Elapsed total CPU time (seconds): 20.130 (user 20.130, system 0.000), 100% CPU 
Elapsed application CPU time (seconds): 14.747, 73% CPU

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0:
0   CoreFoundation                  0x34fe7930 CFBasicHashFindBucket + 2012
1   CoreFoundation                  0x34fe713e CFDictionaryGetValue + 110
2   CoreFoundation                  0x35054722 __CFBinaryPlistCreateObject2 + 38
3   CoreFoundation                  0x35055514 __CFBinaryPlistCreateObject2 + 3608
4   CoreFoundation                  0x35055514 __CFBinaryPlistCreateObject2 + 3608
5   CoreFoundation                  0x3505574e __CFTryParseBinaryPlist + 158
6   CoreFoundation                  0x34ffe9a0 _CFPropertyListCreateWithData + 80
7   CoreFoundation                  0x350175da CFPropertyListCreateWithStream + 430
8   CoreFoundation                  0x350173c0 CFPropertyListCreateFromStream + 56
9   CoreFoundation                  0x350170f0 -[CFXPreferencesPropertyListSourceSynchronizer createPlistFromDisk] + 128
10  CoreFoundation                  0x35007532 -[CFXPreferencesPropertyListSourceSynchronizer synchronizeAlreadyFlocked] + 242
11  CoreFoundation                  0x35007436 -[CFXPreferencesPropertyListSourceSynchronizer synchronize] + 14
12  CoreFoundation                  0x35016b34 -[CFXPreferencesPropertyListSource synchronize] + 104
13  CoreFoundation                  0x3509050e __CFXPreferencesGetSourceForTriplet + 454
14  CoreFoundation                  0x35090238 __CFXPreferencesGetSearchListForBundleID + 164
15  CoreFoundation                  0x3509192e ___CFXPreferencesCopyAppValue_block_invoke_0 + 6
16  CoreFoundation                  0x34fe8b24 CFPreferencesCopyAppValue + 276
17  Foundation                      0x30ed341c -[NSUserDefaults(NSUserDefaults) initWithUser:] + 1356
18  Foundation                      0x30eb28f8 +[NSUserDefaults(NSUserDefaults) standardUserDefaults] + 100
19  UIKit                           0x320f015e _InitMagnificationFilter + 26
20  libsystem_c.dylib               0x36d4b7ce pthread_once + 70
21  UIKit                           0x320dbbcc -[UIView _createLayerWithFrame:] + 424
22  UIKit                           0x320db874 UIViewCommonInitWithFrame + 348
23  UIKit                           0x320db6dc -[UIView initWithFrame:] + 92
24  UIKit                           0x320effaa -[UIStatusBar initWithFrame:showForegroundView:] + 46
25  UIKit                           0x320eff70 -[UIStatusBar initWithFrame:] + 32
26  UIKit                           0x320efdc6 -[UIApplication _createStatusBarWithRequestedStyle:orientation:hidden:] + 78
27  UIKit                           0x320ef876 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 138
28  UIKit                           0x320bdc64 -[UIApplication handleEvent:withNewEvent:] + 1004
29  UIKit                           0x320bd708 -[UIApplication sendEvent:] + 48
30  UIKit                           0x320bd0dc _UIApplicationHandleEvent + 5820
31  GraphicsServices                0x362f2224 PurpleEventCallback + 876
32  CoreFoundation                  0x3507351c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 32
33  CoreFoundation                  0x350734be __CFRunLoopDoSource1 + 134
34  CoreFoundation                  0x3507230c __CFRunLoopRun + 1364
35  CoreFoundation                  0x34ff549e CFRunLoopRunSpecific + 294
36  CoreFoundation                  0x34ff5366 CFRunLoopRunInMode + 98
37  UIKit                           0x320eea0c -[UIApplication _run] + 544
38  UIKit                           0x320ebe76 UIApplicationMain + 1074
39  myapp                               0x00005800 main (main.m:62)
40  myapp                               0x00002404 0x1000 + 5124

Thread 1 name:  Dispatch queue: com.apple.libdispatch-manager
Thread 1:
0   libsystem_kernel.dylib          0x34e833a8 kevent + 24
1   libdispatch.dylib               0x310d0ea4 _dispatch_mgr_invoke + 708
2   libdispatch.dylib               0x310d0bc2 _dispatch_mgr_thread + 30

Thread 2 name:  WebThread
Thread 2:
0   libsystem_kernel.dylib          0x34e83004 mach_msg_trap + 20
1   libsystem_kernel.dylib          0x34e831fa mach_msg + 50
2   CoreFoundation                  0x350733ec __CFRunLoopServiceMachPort + 120
3   CoreFoundation                  0x35072124 __CFRunLoopRun + 876
4   CoreFoundation                  0x34ff549e CFRunLoopRunSpecific + 294
5   CoreFoundation                  0x34ff5366 CFRunLoopRunInMode + 98
6   WebCore                         0x36e780f0 _ZL12RunWebThreadPv + 396
7   libsystem_c.dylib               0x36d5072e _pthread_start + 314
8   libsystem_c.dylib               0x36d505e8 thread_start + 0

Unknown thread crashed with unknown flavor: 5, state_count: 1

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0x35448000 - 0x35591fff  libicucore.A.dylib armv7  <b70646b63f1f3b33896dd8cb91b8dab1> /usr/lib/libicucore.A.dylib
0x35599000 - 0x355e2fff  AddressBook armv7  <b17a2962e9043e0385c3c2c652155f2b> /System/Library/Frameworks/AddressBook.framework/AddressBook
0x358e8000 - 0x358eefff  liblockdown.dylib armv7  <9e45ce468a6f31e5b8263f2c224aa800> /usr/lib/liblockdown.dylib
0x358ef000 - 0x35aacfff  ImageIO armv7  <02e3578171fa3b6a969b244275fd2bab> /System/Library/Frameworks/ImageIO.framework/ImageIO
0x35ad7000 - 0x35ad9fff  MobileInstallation armv7  <215d93dbb0f63cbf828f9126eb7b5349> /System/Library/PrivateFrameworks/MobileInstallation.framework/MobileInstallation
0x35b3e000 - 0x35b61fff  MobileSync armv7  <e42604c550283f4aa517ae8f108b340f> /System/Library/PrivateFrameworks/MobileSync.framework/MobileSync
0x35baf000 - 0x35bfdfff  CoreLocation armv7  <44550ebedf23334d85441d9743b74e03> /System/Library/Frameworks/CoreLocation.framework/CoreLocation
0x35c07000 - 0x35cb5fff  Message armv7  <b8221d43401d315fb84398b7aa570fc1> /System/Library/PrivateFrameworks/Message.framework/Message
0x35dba000 - 0x35dbdfff  libsystem_network.dylib armv7  <356cb66612e836968ef24e6e5c3364cc> /usr/lib/system/libsystem_network.dylib
0x35f76000 - 0x3615afff  AudioToolbox armv7  <c91e27850452330ea804db6408840fd2> /System/Library/Frameworks/AudioToolbox.framework/AudioToolbox
0x3615b000 - 0x3615bfff  libunwind.dylib armv7  <e0a73a57795f3e1698a52ebe6fc07005> /usr/lib/system/libunwind.dylib
0x36299000 - 0x3629ffff  libnotify.dylib armv7  <9406297de3e43742887890662a87ab53> /usr/lib/system/libnotify.dylib
0x362d4000 - 0x362e3fff  MobileDeviceLink armv7  <70ac33720f513f0f97ea2279260678ca> /System/Library/PrivateFrameworks/MobileDeviceLink.framework/MobileDeviceLink
0x362e4000 - 0x362ecfff  ProtocolBuffer armv7  <0e846afacf823d2b8c029cc3010a8253> /System/Library/PrivateFrameworks/ProtocolBuffer.framework/ProtocolBuffer
0x362ed000 - 0x362f7fff  GraphicsServices armv7  <e21a6e61bdd136b6805a9e3abe2e3d1f> /System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices
0x362f8000 - 0x362fffff  MailServices armv7  <ab2388ce733e38b7a261273a401bbbf1> /System/Library/PrivateFrameworks/MailServices.framework/MailServices
0x3630d000 - 0x36323fff  EAP8021X armv7  <fffe86a22bc434a6ae84f23bfecef9d6> /System/Library/PrivateFrameworks/EAP8021X.framework/EAP8021X
0x3632a000 - 0x363ecfff  Celestial armv7  <2a59586b0ae937c3b25fe526924aa885> /System/Library/PrivateFrameworks/Celestial.framework/Celestial
0x364b7000 - 0x364bbfff  libAccessibility.dylib armv7  <9a17d07b5a3b38cfafdf16f78c99b572> /usr/lib/libAccessibility.dylib
0x364bd000 - 0x36583fff  libobjc.A.dylib armv7  <90014d1bc583366d85622e43097df416> /usr/lib/libobjc.A.dylib
0x36584000 - 0x36584fff  libgcc_s.1.dylib armv7  <eb82984fa36c329387aa518aa5205f3d> /usr/lib/libgcc_s.1.dylib
0x3659f000 - 0x365a2fff  ActorKit armv7  <434c756a6b053f4ba3c954cfccddbf59> /System/Library/PrivateFrameworks/ActorKit.framework/ActorKit
0x36631000 - 0x36636fff  CrashReporterSupport armv7  <2bb524b3bb3c3eb2932ce13b655b7c7c> /System/Library/PrivateFrameworks/CrashReporterSupport.framework/CrashReporterSupport
0x36738000 - 0x36758fff  libxslt.1.dylib armv7  <39348471007e39dab80af68b08390456> /usr/lib/libxslt.1.dylib
0x368bc000 - 0x368d9fff  libsystem_info.dylib armv7  <50863bcbf478323e96a8e5b1a83ea6f9> /usr/lib/system/libsystem_info.dylib
0x368da000 - 0x368e9fff  SpringBoardServices armv7  <ca5b10014b473d2eaec5c48d89ee1b54> /System/Library/PrivateFrameworks/SpringBoardServices.framework/SpringBoardServices
0x3692a000 - 0x3692afff  libCVMSPluginSupport.dylib armv7  <a80aaa9989483ce3a496a061fd1e9e0a> /System/Library/Frameworks/OpenGLES.framework/libCVMSPluginSupport.dylib
0x36a58000 - 0x36a59fff  CoreSurface armv7  <7850befd26b630f183ee326aaadd7b34> /System/Library/PrivateFrameworks/CoreSurface.framework/CoreSurface
0x36b47000 - 0x36b4afff  libcompiler_rt.dylib armv7  <b2c05d8601c13be884097192dca4e187> /usr/lib/system/libcompiler_rt.dylib
0x36b84000 - 0x36c75fff  QuartzCore armv7  <a2afbe6483683d05ad51b106f98776e2> /System/Library/Frameworks/QuartzCore.framework/QuartzCore
0x36cfa000 - 0x36cfbfff  libsystem_sandbox.dylib armv7  <66e985f3eea03ef08afb7cf4c153f76e> /usr/lib/system/libsystem_sandbox.dylib
0x36d3d000 - 0x36d41fff  FTClientServices armv7  <21de970d7ebb3e7fb502a0a5451b0806> /System/Library/PrivateFrameworks/FTClientServices.framework/FTClientServices
0x36d42000 - 0x36dcefff  libsystem_c.dylib armv7  <f859ce1ad1773f0ba98d7c6e135b7697> /usr/lib/system/libsystem_c.dylib
0x36dcf000 - 0x3758dfff  WebCore armv7  <814351ff217e3425a8e532c2e2251f73> /System/Library/PrivateFrameworks/WebCore.framework/WebCore
0x3795b000 - 0x3795ffff  Marco armv7  <8dea3e558fe534ff868fc92e215ce53b> /System/Library/PrivateFrameworks/Marco.framework/Marco
0x3799c000 - 0x37a46fff  libBLAS.dylib armv7  <bf822cc1a3243ae7b104cf73ca22d352> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libBLAS.dylib
0x37a5d000 - 0x37aa0fff  libcommonCrypto.dylib armv7  <95b49daf4cf038b6bea8010bba3a1e26> /usr/lib/system/libcommonCrypto.dylib
0x37acb000 - 0x37b78fff  libxml2.2.dylib armv7  <58d47f064e0232119f4b838ad659f9c1> /usr/lib/libxml2.2.dylib
0x37bb8000 - 0x37bc0fff  MobileWiFi armv7  <b76c3e9fb78234c392058250d4620e72> /System/Library/PrivateFrameworks/MobileWiFi.framework/MobileWiFi
0x37bc3000 - 0x37bc8fff  libsystem_dnssd.dylib armv7  <27bb5462450732e380f5a2c170546e93> /usr/lib/system/libsystem_dnssd.dylib
0x37c6c000 - 0x37cb0fff  MobileCoreServices armv7  <757226927a873d5492be721908077b48> /System/Library/Frameworks/MobileCoreServices.framework/MobileCoreServices
0x37d27000 - 0x37d8afff  IMCore armv7  <6e26e99b9b5f3829a8486ffd8c64f0d2> /System/Library/PrivateFrameworks/IMCore.framework/IMCore
0x37da5000 - 0x37e3efff  EventKit armv7  <d67aa1508ee7306b8e2a45c76ffddff0> /System/Library/Frameworks/EventKit.framework/EventKit
0x37eff000 - 0x37f01fff  libCoreVMClient.dylib armv7  <d4d4aa3090c83e87bcb15ed00b93fd5c> /System/Library/Frameworks/OpenGLES.framework/libCoreVMClient.dylib
0x37f1c000 - 0x37f1ffff  CoreTime armv7  <a398de5ba1e43a11b7008e9bb5a7f6fe> /System/Library/PrivateFrameworks/CoreTime.framework/CoreTime

Answer 1

因此，一般来说，在主线程上执行繁重的工作会导致应用程序的 UI 锁定。操作系统正在寻找 applicationDidFinishLaunchingWithOptions 在合理的时间后返回。如果没有，它会杀死你的应用程序并给你 8badf00d 异常代码。看看你过去的时间；超过20秒!我得到了 8badf00d，因为发射时间少于 5 秒。

显然，您不会一直在所有设备上遇到此崩溃。如果您的设置依赖于互联网连接(就像我的那样)，您可能会在尝试连接到 Edge 或可疑 WiFi 连接的设备上获得它。如果你正在做大量繁重的图形工作，这也可能会超过加载时间阈值。您在 iOS5 中看到这一点的唯一原因可能是 Apple 减少了 iOS5 设备的加载时间最大限制(更好的硬件，更好的软件，加载时间也应该更好，有人可以争论)。我强烈建议在后台线程中启动设置。如果该设置是您的应用程序不可或缺的一部分，请考虑先使用加载指示器加载启动画面，并在设置完成后删除该 View 。从用户的角度来看，他们只会像往常一样在启动时看到启动画面，然后可能会出现一个事件指示器或其他东西，然后当它消失时，他们就有了一个完全配置的设置。

其他选项是优化加载代码，使其在几秒钟内完成。但如果你现在是 20 秒，我看不出有多少优化是可能的。

更新: 来自苹果文档:

The most common cause for watchdog timeout crashes in a network application is synchronous networking on the main thread. There are four contributing factors here: synchronous networking — This is where you make a network request and block waiting for the response. main thread — Synchronous networking is less than ideal in general, but it causes specific problems if you do it on the main thread. Remember that the main thread is responsible for running the user interface. If you block the main thread for any significant amount of time, the user interface becomes unacceptably unresponsive. long timeouts — If the network just goes away (for example, the user is on a train which > goes into a tunnel), any pending network request won't fail until some timeout has expired. Most network timeouts are measured in minutes, meaning that a blocked synchronous network request on the main thread can keep the user interface unresponsive for minutes at a time. Trying to avoid this problem by reducing the network timeout is not a good idea. In some > situations it can take many seconds for a network request to succeed, and if you always time out early then you'll never make any progress at all. watchdog — In order to keep the user interface responsive, iOS includes a watchdog mechanism. If your application fails to respond to certain user interface events (launch, suspend, resume, terminate) in time, the watchdog will kill your application and generate a watchdog timeout crash report. The amount of time the watchdog gives you is not formally documented, but it's always less than a network timeout. One tricky aspect of this problem is that it's highly dependent on the network environment. If you always test your application in your office, where network connectivity is good, you'll never see this type of crash. However, once you start deploying your application to end users—who will run it in all sorts of network environments—crashes like this will become common. Warning To summarize, if you make synchronous networking calls on the main thread, your application will suffer from watchdog timeout crashes when it's deployed to a wide range of users.