那些遇到过的问题

iOS11看门狗超时崩溃(0x8badf00d)但代码不在堆栈上

esi*_*ver 3 background-process ios uibackgroundtask

我正在调试我们的应用程序的用户报告,这些报告在iOS11开始时在后台重复退出,即使在活动使用期间(例如,用户背景我们并在几秒钟或一分钟内返回,只是发现它重新启动).崩溃日志都显示了相同的原因:看门狗超时.以下是一个此类崩溃日志中的相关位:

Exception Type:  EXC_CRASH (SIGKILL)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Termination Reason: Namespace <0xF>, Code 0x8badf00d
Triggered by Thread:  0
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我意识到我们的代码在接收推送通知或后台运行时的操作时间有限.我们肯定使用UIBackgroundTasks(使用Alamofire Networking,FWIW),我们确实有过期处理程序来执行此操作:

backgroundTask = [application beginBackgroundTaskWithExpirationHandler:^{
    [application endBackgroundTask:backgroundTask];
    backgroundTask = UIBackgroundTaskInvalid; // Set the task to be invalid
    DebugLog(@"Ended because expiration");
}];
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关于这些崩溃报告最令人困惑的事情是我们的代码无处于堆栈中.我们可以从Apple对0x8badf00d异常代码的讨论中看到,实际上,有问题的代码正在主线程上主动执行.

但是,在我的情况下,没有任何堆栈有任何代码被执行.这是一个代表性的样本:

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   libsystem_kernel.dylib          0x0000000183208bc4 0x183208000 + 3012
1   libsystem_kernel.dylib          0x0000000183208a3c 0x183208000 + 2620
2   CoreFoundation                  0x00000001836b9c4c 0x1835d0000 + 957516
3   CoreFoundation                  0x00000001836b7818 0x1835d0000 + 948248
4   CoreFoundation                  0x00000001835d7e78 0x1835d0000 + 32376
5   GraphicsServices                0x000000018546cf84 0x185462000 + 44932
6   UIKit                           0x000000018d37a0bc 0x18d307000 + 471228
7   MyApp                           0x0000000102a6572c main + 87852 (main.m:22)
8   libdyld.dylib                   0x00000001830fa56c 0x1830f9000 + 5484

Thread 1 name:  com.apple.uikit.eventfetch-thread
Thread 1:
0   libsystem_kernel.dylib          0x0000000183208bc4 0x183208000 + 3012
1   libsystem_kernel.dylib          0x0000000183208a3c 0x183208000 + 2620
2   CoreFoundation                  0x00000001836b9c4c 0x1835d0000 + 957516
3   CoreFoundation                  0x00000001836b7818 0x1835d0000 + 948248
4   CoreFoundation                  0x00000001835d7e78 0x1835d0000 + 32376
5   Foundation                      0x00000001840006e4 0x183ff4000 + 50916
6   Foundation                      0x000000018401fafc 0x183ff4000 + 178940
7   UIKit                           0x000000018ded9630 0x18d307000 + 12396080
8   Foundation                      0x0000000184101860 0x183ff4000 + 1103968
9   libsystem_pthread.dylib         0x000000018333c31c 0x18333a000 + 8988
10  libsystem_pthread.dylib         0x000000018333c1e8 0x18333a000 + 8680
11  libsystem_pthread.dylib         0x000000018333ac28 0x18333a000 + 3112

Thread 2 name:  com.twitter.crashlytics.ios.MachExceptionServer
Thread 2:
0   libsystem_kernel.dylib          0x0000000183208bc4 0x183208000 + 3012
1   libsystem_kernel.dylib          0x0000000183208a3c 0x183208000 + 2620
2   MyApp                           0x0000000102cdaad8 CLSMachExceptionServer + 100
3   libsystem_pthread.dylib         0x000000018333c31c 0x18333a000 + 8988
4   libsystem_pthread.dylib         0x000000018333c1e8 0x18333a000 + 8680
5   libsystem_pthread.dylib         0x000000018333ac28 0x18333a000 + 3112

Thread 3 name:  com.apple.NSURLConnectionLoader
Thread 3:
0   libsystem_kernel.dylib          0x0000000183208bc4 0x183208000 + 3012
1   libsystem_kernel.dylib          0x0000000183208a3c 0x183208000 + 2620
2   CoreFoundation                  0x00000001836b9c4c 0x1835d0000 + 957516
3   CoreFoundation                  0x00000001836b7818 0x1835d0000 + 948248
4   CoreFoundation                  0x00000001835d7e78 0x1835d0000 + 32376
5   CFNetwork                       0x0000000183d41de0 0x183c93000 + 716256
6   Foundation                      0x0000000184101860 0x183ff4000 + 1103968
7   libsystem_pthread.dylib         0x000000018333c31c 0x18333a000 + 8988
8   libsystem_pthread.dylib         0x000000018333c1e8 0x18333a000 + 8680
9   libsystem_pthread.dylib         0x000000018333ac28 0x18333a000 + 3112

Thread 4 name:  AVAudioSession Notify Thread
Thread 4:
0   libsystem_kernel.dylib          0x0000000183208bc4 0x183208000 + 3012
1   libsystem_kernel.dylib          0x0000000183208a3c 0x183208000 + 2620
2   CoreFoundation                  0x00000001836b9c4c 0x1835d0000 + 957516
3   CoreFoundation                  0x00000001836b7818 0x1835d0000 + 948248
4   CoreFoundation                  0x00000001835d7e78 0x1835d0000 + 32376
5   AVFAudio                        0x0000000189615774 0x189591000 + 542580
6   AVFAudio                        0x0000000189640018 0x189591000 + 716824
7   libsystem_pthread.dylib         0x000000018333c31c 0x18333a000 + 8988
8   libsystem_pthread.dylib         0x000000018333c1e8 0x18333a000 + 8680
9   libsystem_pthread.dylib         0x000000018333ac28 0x18333a000 + 3112

Thread 5:
0   libsystem_kernel.dylib          0x0000000183229150 0x183208000 + 135504
1   libsystem_pthread.dylib         0x000000018333ed30 0x18333a000 + 19760
2   libc++.1.dylib                  0x00000001828e3ea4 0x1828dc000 + 32420
3   JavaScriptCore                  0x000000018b157d00 0x18a812000 + 9723136
4   JavaScriptCore                  0x000000018b157c28 0x18a812000 + 9722920
5   JavaScriptCore                  0x000000018b157f8c 0x18a812000 + 9723788
6   libsystem_pthread.dylib         0x000000018333c31c 0x18333a000 + 8988
7   libsystem_pthread.dylib         0x000000018333c1e8 0x18333a000 + 8680
8   libsystem_pthread.dylib         0x000000018333ac28 0x18333a000 + 3112

Thread 6 name:  WebThread
Thread 6:
0   libsystem_kernel.dylib          0x0000000183208bc4 0x183208000 + 3012
1   libsystem_kernel.dylib          0x0000000183208a3c 0x183208000 + 2620
2   CoreFoundation                  0x00000001836b9c4c 0x1835d0000 + 957516
3   CoreFoundation                  0x00000001836b7818 0x1835d0000 + 948248
4   CoreFoundation                  0x00000001835d7e78 0x1835d0000 + 32376
5   WebCore                         0x000000018bc1c75c 0x18bbdb000 + 268124
6   libsystem_pthread.dylib         0x000000018333c31c 0x18333a000 + 8988
7   libsystem_pthread.dylib         0x000000018333c1e8 0x18333a000 + 8680
8   libsystem_pthread.dylib         0x000000018333ac28 0x18333a000 + 3112

Thread 7 name:  WebCore: LocalStorage
Thread 7:
0   libsystem_kernel.dylib          0x0000000183229150 0x183208000 + 135504
1   libsystem_pthread.dylib         0x000000018333ed30 0x18333a000 + 19760
2   JavaScriptCore                  0x000000018a81fa18 0x18a812000 + 55832
3   JavaScriptCore                  0x000000018b13da04 0x18a812000 + 9615876
4   WebKitLegacy                    0x000000018d00f5fc 0x18cf7c000 + 603644
5   WebKitLegacy                    0x000000018d01226c 0x18cf7c000 + 615020
6   WebKitLegacy                    0x000000018d011998 0x18cf7c000 + 612760
7   JavaScriptCore                  0x000000018a81c010 0x18a812000 + 40976
8   JavaScriptCore                  0x000000018a81bf50 0x18a812000 + 40784
9   libsystem_pthread.dylib         0x000000018333c31c 0x18333a000 + 8988
10  libsystem_pthread.dylib         0x000000018333c1e8 0x18333a000 + 8680
11  libsystem_pthread.dylib         0x000000018333ac28 0x18333a000 + 3112

Thread 8 name:  com.apple.CFSocket.private
Thread 8:
0   libsystem_kernel.dylib          0x0000000183229570 0x183208000 + 136560
1   CoreFoundation                  0x00000001836c2184 0x1835d0000 + 991620
2   libsystem_pthread.dylib         0x000000018333c31c 0x18333a000 + 8988
3   libsystem_pthread.dylib         0x000000018333c1e8 0x18333a000 + 8680
4   libsystem_pthread.dylib         0x000000018333ac28 0x18333a000 + 3112

Thread 9:
0   libsystem_pthread.dylib         0x000000018333ac1c 0x18333a000 + 3100

Thread 10:
0   libsystem_kernel.dylib          0x0000000183229dbc 0x183208000 + 138684
1   libsystem_pthread.dylib         0x000000018333afa0 0x18333a000 + 4000
2   libsystem_pthread.dylib         0x000000018333ac20 0x18333a000 + 3104

Thread 11:
0   libsystem_pthread.dylib         0x000000018333ac1c 0x18333a000 + 3100

Thread 0 crashed with ARM Thread State (64-bit):
    x0: 0x0000000010004005   x1: 0x0000000007000806   x2: 0x0000000000000000   x3: 0x0000000000000c00
    x4: 0x0000000000002b03   x5: 0x00000000ffffffff   x6: 0x0000000000000000   x7: 0x0000000000000000
    x8: 0x00000000fffffbbf   x9: 0x0000000007000000  x10: 0x0000000007000100  x11: 0x0000000000000040
   x12: 0xffffffffffffffff  x13: 0x0000000000000001  x14: 0x01e8540001e85400  x15: 0x0000000000000000
   x16: 0xffffffffffffffe1  x17: 0x00000000ffffffff  x18: 0x0000000000000000  x19: 0x0000000000000000
   x20: 0x00000000ffffffff  x21: 0x0000000000002b03  x22: 0x0000000000000c00  x23: 0x000000016d3aed38
   x24: 0x0000000007000806  x25: 0x0000000000000000  x26: 0x0000000007000806  x27: 0x0000000000000c00
   x28: 0x0000000000000001   fp: 0x000000016d3aec30   lr: 0x0000000183208a3c
    sp: 0x000000016d3aebe0   pc: 0x0000000183208bc4 cpsr: 0x60000000
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我运行的代码的唯一部分是main.m,第22行,即

int retVal = UIApplicationMain(argc, argv, nil, @"PSSMyAppDelegate");
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因此,当我的代码似乎没有运行时,我很困惑我的应用程序如何被重复杀死以防止运行时违规.iOS 11中有什么新东西可以改变看门狗进程的行为吗？如果没有,我如何判断我的代码的哪一部分是违反运行时间过长的部分？

小智 5

你的线程0看起来很像我们在iOS 11中遇到的崩溃.这是我们的:

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   libsystem_kernel.dylib         0x00000001853c4bc4 mach_msg_trap + 8
1   libsystem_kernel.dylib         0x00000001853c4a3c mach_msg + 72
2   CoreFoundation                 0x0000000185875c4c __CFRunLoopServiceMachPort + 196
3   CoreFoundation                 0x0000000185873818 __CFRunLoopRun + 1424
4   CoreFoundation                 0x0000000185793e78 CFRunLoopRunSpecific + 436
5   GraphicsServices               0x0000000187628f84 GSEventRunModal + 100
6   UIKit                         0x000000018f5360bc UIApplicationMain + 208
7   TestCrashInBackground         0x0000000100e8dbac 0x100e88000 + 23468
8   libdyld.dylib                 0x00000001852b656c start + 4
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对我们来说问题是显示通知会导致应用程序崩溃(当应用程序背景化时).我们甚至创建了一个测试应用程序(您在上面看到的TestCrashInBackground),我们可以在其中重现此问题.该应用程序仅显示通知,并且没有任何后台任务.测试用例是:

  1. 该应用程序显示通知
  2. 用户为应用程序添加背景(按下主页键).
  3. 用户锁定屏幕

结果:操作系统在一段(短)时间后杀死应用程序.

在发生这种情况之后我们采取了sysdiagnose,我们可以看到,当我们显示通知时,会添加一个名为"将显示通知"的断言.

default 2017-10-03 14:32:16.280562 +0200    assertiond  [SpringBoard:53] Attempting to acquire assertion for TestCrashInBack:507: <BKProcessAssertion: 0x101235c90; "will present notification" (notificationAction:30s); id:…E1D79D51D1D9>
default 2017-10-03 14:32:16.281283 +0200    assertiond  [TestCrashInBack:507] Add assertion: <BKProcessAssertion: 0x101235c90; id: 53-96A5F4EA-4C42-4675-97E4-E1D79D51D1D9; name: "will present notification"; state: active; reason: notificationAction; duration: 30.0s> {
    owner = <BSProcessHandle: 0x10110a810; SpringBoard:53; valid: YES>;
    flags = preventSuspend, preventThrottleDownUI, preventIdleSleep, preventSuspendOnSleep;
}
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大约45秒后,该应用程序被杀死,因为它"超出允许时间有活动断言":

default 2017-10-03 14:33:00.436085 +0200    assertiond  [TestCrashInBack:507] Forcing crash report with description: TestCrashInBack:507 has active assertions beyond permitted time: 
<BKProcessAssertion: 0x101235c90; "will present notification" (notificationAction:30s); id:…E1D79D51D1D9> (owner: SpringBoard:53)
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这一切只是为了显示通知......非常严重的错误!

这是添加通知的代码:

UNMutableNotificationContent *content = [[UNMutableNotificationContent alloc] init];
content.body = NSLocalizedString(@"This is test notification", nil);

UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier:content.body content:content trigger:[UNTimeIntervalNotificationTrigger triggerWithTimeInterval:1.0 repeats:NO]];
[[UNUserNotificationCenter currentNotificationCenter] addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {
    NSLog(@"display notification error:%@", error);
}];
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我已经向Apple(id:34788843)提交了一个错误报告,其中包含我们的测试项目和附带的sysdiagnose.希望他们能尽快解决这个问题.

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