15 Replies
      Latest reply on Aug 24, 2018 1:20 AM by eskimo
      esilverberg Level 1 Level 1 (0 points)

        Hi,

         

        I am debugging user reports of our app repeatedly exiting while in the background starting in iOS11, even during active use (for example, the user backgrounds us and returns within a few seconds or a minute, only to find it restarted). Here is the relevant bit from one such crash log:

         

        Exception Type:  EXC_CRASH (SIGKILL)

        Exception Codes: 0x0000000000000000, 0x0000000000000000

        Exception Note:  EXC_CORPSE_NOTIFY

        Termination Reason: Namespace <0xF>, Code 0x8badf00d

        Triggered by Thread:  0

         

        I realize that our code has a limited period of time during which to operation when receiving push notifications or when backgrounded. We definitely do use UIBackgroundTasks (with Alamofire Networking, FWIW), and we do have expiration handlers that do this:

         

            backgroundTask = [application beginBackgroundTaskWithExpirationHandler:^{
                [application endBackgroundTask:backgroundTask];
                backgroundTask = UIBackgroundTaskInvalid; /
                DebugLog(@"Ended because expiration");
            }];
        
        

         

        The most perplexing thing about these crash reports is that our code is nowhere on the stacks. We can see from this Apple discussion of the 0x8badf00d exception code, the offending code is, in fact, being actively executed on the main thread.

         

        However, in my case, none of the stacks ever have any of my code being executed. Here is one representative sample:

         

        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
        
        

         

         

        The only part of my code that is running is main.m, line 22, which is

         

        int retVal = UIApplicationMain(argc, argv, nil, @"PSSMyAppDelegate");
        
        

         

        Thus, I am perplexed as to how my app could be repeatedly killed for running time violations when it would seem that none of my code is, in fact, running. Is there anything new in iOS 11 that could change the behavior of the watchdog process? If not, how can I tell what part of my code is the part that is in violation for running too long?

        • Re: iOS11 watchdog timeout crashes (0x8badf00d) but code not on stack
          eskimo Apple Staff Apple Staff (11,355 points)

          The most common cause of this problem is the app ‘leaking’ a UIApplication background task.  Consider code like this:

          let taskID = UIApplication.shared.beginBackgroundTask(withName: "qqqleak") {
              // Whoops, we've forgotten to call `UIApplication.shared.endBackgroundTask(_:)`.
          }

          If you run this code and then put the app in the background, three minutes later you’ll get a crash log that’s very similar to the one you posted (that is, none of your code is in any of the backtraces).

          The trick to debugging problems like this is to put useful information in your background task’s name.  This shows up in many log messages related to the background task (but not always in the crash report, alas).  Looking at this on iOS 11.0 I see this log message generated when the system crashes your app in this case:

          [xxsi:2136] Forcing crash report with description: xxsi:2136 has active assertions beyond permitted time: 
          <BKProcessAssertion: 0x100e44330; "qqqleak" (finishTask:180s); id:…378BA0510589> (owner: xxsi:2136)

          If you can get a sysdiagnose from a user having this problem, you might be able to debug it from there.


          For more, ah hem, background on UIApplication background tasks, see my UIApplication Background Task Notes pinned post.

          Share and Enjoy

          Quinn “The Eskimo!”
          Apple Developer Relations, Developer Technical Support, Core OS/Hardware
          let myEmail = "eskimo" + "1" + "@apple.com"

            • Re: iOS11 watchdog timeout crashes (0x8badf00d) but code not on stack
              mdavidkhan Level 1 Level 1 (0 points)

              Hi,

               

              I am working on a background application which gets location updates, however while in background my application some times crashes. I am properly ending background task in expiration handler. Can you help?

               

               

               

              Bellow is the crash log

               

              Incident Identifier: 3D6C5F2F-64C7-48C2-B122-EA36BC27A322

              CrashReporter Key:   e7d1ac22fb312e0d0d5c93b4b3e669abe66abad5

              Hardware Model:      iPhone10,6

              Process:             MainApp [400]

              Path:                /private/var/containers/Bundle/Application/8B1307E7-A14C-4D20-A611-E05C07ECCEE0/MainApp.app/MainApp

              Identifier:          com.myApp.myApp

              Version:             1 (3.0.8.0)

              Code Type:           ARM-64 (Native)

              Role:                Foreground

              Parent Process:      launchd [1]

              Coalition:           com.myApp.myApp

               

               

               

               

              Date/Time:           2018-02-14 14:36:29.4968 +0500

              Launch Time:         2018-02-14 14:33:21.5729 +0500

              OS Version:          iPhone OS 11.1.1 (15B150)

              Baseband Version:    1.02.03

              Report Version:      104

               

               

              Exception Type:  EXC_CRASH (SIGKILL)

              Exception Codes: 0x0000000000000000, 0x0000000000000000

              Exception Note:  EXC_CORPSE_NOTIFY

              Termination Reason: Namespace <0xF>, Code 0x8badf00d

              Triggered by Thread:  0

               

               

              Filtered syslog:

              None found

               

               

              Thread 0 name:  Dispatch queue: com.apple.main-thread

              Thread 0 Crashed:

              0   libsystem_kernel.dylib         0x0000000184220bc4 mach_msg_trap + 8

              1   libsystem_kernel.dylib         0x0000000184220a3c mach_msg + 72

              2   CoreFoundation                 0x00000001846d1c74 __CFRunLoopServiceMachPort + 196

              3   CoreFoundation                 0x00000001846cf840 __CFRunLoopRun + 1424

              4   CoreFoundation                 0x00000001845effb8 CFRunLoopRunSpecific + 436

              5   GraphicsServices               0x0000000186487f84 GSEventRunModal + 100

              6   UIKit                         0x000000018dbc42f4 UIApplicationMain + 208

              7   MainApp                       0x0000000102e15478 main + 4772984 (main.m:17)

              8   libdyld.dylib                 0x000000018411256c start + 4

               

               

              Thread 1 name:  com.apple.uikit.eventfetch-thread

              Thread 1:

              0   libsystem_kernel.dylib         0x0000000184220bc4 mach_msg_trap + 8

              1   libsystem_kernel.dylib         0x0000000184220a3c mach_msg + 72

              2   CoreFoundation                 0x00000001846d1c74 __CFRunLoopServiceMachPort + 196

              3   CoreFoundation                 0x00000001846cf840 __CFRunLoopRun + 1424

              4   CoreFoundation                 0x00000001845effb8 CFRunLoopRunSpecific + 436

              5   Foundation                     0x00000001850196e4 -[NSRunLoop+ 50916 (NSRunLoop) runMode:beforeDate:] + 304

              6   Foundation                     0x0000000185038afc -[NSRunLoop+ 178940 (NSRunLoop) runUntilDate:] + 96

              7   UIKit                         0x000000018e7232f4 -[UIEventFetcher threadMain] + 136

              8   Foundation                     0x000000018511a860 __NSThread__start__ + 996

              9   libsystem_pthread.dylib       0x000000018435431c _pthread_body + 308

              10  libsystem_pthread.dylib       0x00000001843541e8 _pthread_body + 0

              11  libsystem_pthread.dylib       0x0000000184352c28 thread_start + 4

               

               

              Thread 2 name:  com.apple.NSURLConnectionLoader

              Thread 2:

              0   libsystem_kernel.dylib         0x0000000184220bc4 mach_msg_trap + 8

              1   libsystem_kernel.dylib         0x0000000184220a3c mach_msg + 72

              2   CoreFoundation                 0x00000001846d1c74 __CFRunLoopServiceMachPort + 196

              3   CoreFoundation                 0x00000001846cf840 __CFRunLoopRun + 1424

              4   CoreFoundation                 0x00000001845effb8 CFRunLoopRunSpecific + 436

              5   CFNetwork                     0x0000000184d5a264 +[NSURLConnection+ 717412 (Loader) _resourceLoadLoop:] + 404

              6   Foundation                     0x000000018511a860 __NSThread__start__ + 996

              7   libsystem_pthread.dylib       0x000000018435431c _pthread_body + 308

              8   libsystem_pthread.dylib       0x00000001843541e8 _pthread_body + 0

              9   libsystem_pthread.dylib       0x0000000184352c28 thread_start + 4

               

               

              Thread 3 name:  GAIThread

              Thread 3:

              0   libsystem_kernel.dylib         0x0000000184220bc4 mach_msg_trap + 8

              1   libsystem_kernel.dylib         0x0000000184220a3c mach_msg + 72

              2   CoreFoundation                 0x00000001846d1c74 __CFRunLoopServiceMachPort + 196

              3   CoreFoundation                 0x00000001846cf840 __CFRunLoopRun + 1424

              4   CoreFoundation                 0x00000001845effb8 CFRunLoopRunSpecific + 436

              5   Foundation                     0x00000001850196e4 -[NSRunLoop+ 50916 (NSRunLoop) runMode:beforeDate:] + 304

              6   Foundation                     0x000000018506b62c -[NSRunLoop+ 386604 (NSRunLoop) run] + 88

              7   MainApp                       0x00000001030d2e38 +[GAI threadMain:] + 72

              8   Foundation                     0x000000018511a860 __NSThread__start__ + 996

              9   libsystem_pthread.dylib       0x000000018435431c _pthread_body + 308

              10  libsystem_pthread.dylib       0x00000001843541e8 _pthread_body + 0

              11  libsystem_pthread.dylib       0x0000000184352c28 thread_start + 4

               

               

              Thread 4 name:  com.twitter.crashlytics.ios.MachExceptionServer

              Thread 4:

              0   libsystem_kernel.dylib         0x0000000184220bc4 mach_msg_trap + 8

              1   libsystem_kernel.dylib         0x0000000184220a3c mach_msg + 72

              2   MainApp                       0x000000010314f66c CLSMachExceptionServer + 100

              3   libsystem_pthread.dylib       0x000000018435431c _pthread_body + 308

              4   libsystem_pthread.dylib       0x00000001843541e8 _pthread_body + 0

              5   libsystem_pthread.dylib       0x0000000184352c28 thread_start + 4

               

               

              Thread 5 name:  AVAudioSession Notify Thread

              Thread 5:

              0   libsystem_kernel.dylib         0x0000000184220bc4 mach_msg_trap + 8

              1   libsystem_kernel.dylib         0x0000000184220a3c mach_msg + 72

              2   CoreFoundation                 0x00000001846d1c74 __CFRunLoopServiceMachPort + 196

              3   CoreFoundation                 0x00000001846cf840 __CFRunLoopRun + 1424

              4   CoreFoundation                 0x00000001845effb8 CFRunLoopRunSpecific + 436

              5   AVFAudio                       0x0000000189ed8774 GenericRunLoopThread::Entry+ 542580 (void*) + 164

              6   AVFAudio                       0x0000000189f03018 CAPThread::Entry+ 716824 (CAPThread*) + 84

              7   libsystem_pthread.dylib       0x000000018435431c _pthread_body + 308

              8   libsystem_pthread.dylib       0x00000001843541e8 _pthread_body + 0

              9   libsystem_pthread.dylib       0x0000000184352c28 thread_start + 4

               

               

              Thread 6:

              0   libsystem_pthread.dylib       0x0000000184352c1c start_wqthread + 0

               

               

              Thread 7:

              0   libsystem_pthread.dylib       0x0000000184352c1c start_wqthread + 0

               

               

              Thread 8:

              0   libsystem_pthread.dylib       0x0000000184352c1c start_wqthread + 0

               

               

              Thread 0 crashed with ARM Thread State (64-bit):

                  x0: 0x0000000010004005   x1: 0x0000000007000806   x2: 0x0000000000000000   x3: 0x0000000000000c00

                  x4: 0x0000000000002603   x5: 0x00000000ffffffff   x6: 0x0000000000000000   x7: 0x0000000000004b71

                  x8: 0x00000000fffffbbf   x9: 0x0000000007000000  x10: 0x0000000007000100  x11: 0x0000000000000040

                 x12: 0xffffffffffffffff  x13: 0x0000000000000001  x14: 0x0018910000189100  x15: 0x0000000000000000

                 x16: 0xffffffffffffffe1  x17: 0x00000000ffffffff  x18: 0x0000000000000000  x19: 0x0000000000000000

                 x20: 0x00000000ffffffff  x21: 0x0000000000002603  x22: 0x0000000000000c00  x23: 0x000000016d476c88

                 x24: 0x0000000007000806  x25: 0x0000000000000000  x26: 0x0000000007000806  x27: 0x0000000000000c00

                 x28: 0x0000000000000001   fp: 0x000000016d476b80   lr: 0x0000000184220a3c

                  sp: 0x000000016d476b30   pc: 0x0000000184220bc4 cpsr: 0x60000000

               

               

              Binary Images:

              0x102988000 - 0x10330ffff MainApp arm64  <a4a061f4c898323b8835d6573ca12a60> /var/containers/Bundle/Application/8B1307E7-A14C-4D20-A611-E05C07ECCEE0/MainApp.app/MainApp

              0x103e04000 - 0x103e43fff dyld arm64  <92368d6f78863cc88239f2e3ec79bba8> /usr/lib/dyld

              0x103ea0000 - 0x103f3bfff CorePlot arm64  <8133dd4eb8ae3b60844c489be8ba59b1> /var/containers/Bundle/Application/8B1307E7-A14C-4D20-A611-E05C07ECCEE0/MainApp.app/Frameworks/CorePlot.framework/CorePlot

              0x1838f2000 - 0x1838f3fff libSystem.B.dylib arm64  <758163f7d63f393a9c53e184688479d4> /usr/lib/libSystem.B.dylib

              0x1838f4000 - 0x18394dfff libc++.1.dylib arm64  <2c929c029baf3d0f84a2e636550af33c> /usr/lib/libc++.1.dylib

              0x18394e000 - 0x18396efff libc++abi.dylib arm64  <4e4a4bcb0b63363db460a93569a74fd6> /usr/lib/libc++abi.dylib

              0x183970000 - 0x18402bfff libobjc.A.dylib arm64  <5f420cdc6f593721a9cf0464bd87e1a2> /usr/lib/libobjc.A.dylib

              0x18402c000 - 0x184030fff libcache.dylib arm64  <899cd22e8e8b33cab299fb46175d7a5c> /usr/lib/system/libcache.dylib

              0x184031000 - 0x18403cfff libcommonCrypto.dylib arm64  <ed799302ae4534aa92dd727859a4e157> /usr/lib/system/libcommonCrypto.dylib

              0x18403d000 - 0x184040fff libcompiler_rt.dylib arm64  <ef90354df4533ea7aba7c780c7ffc720> /usr/lib/system/libcompiler_rt.dylib

              0x184041000 - 0x184048fff libcopyfile.dylib arm64  <2964b6d9e7303d5fb6e2b2dd0a29c508> /usr/lib/system/libcopyfile.dylib

              0x184049000 - 0x1840abfff libcorecrypto.dylib arm64  <1e6818828cfb3b5b940ed390607b27ac> /usr/lib/system/libcorecrypto.dylib

              0x1840ac000 - 0x184110fff libdispatch.dylib arm64  <a879dad0ed5c3e0bbfd5a8c14045bfb3> /usr/lib/system/libdispatch.dylib

              0x184111000 - 0x18412bfff libdyld.dylib arm64  <30eea71a4f5b39ee8c6b426835348e81> /usr/lib/system/libdyld.dylib

              0x18412c000 - 0x18412cfff liblaunch.dylib arm64  <27dbe9e050e3340dbad0477ae2e4aad5> /usr/lib/system/liblaunch.dylib

              0x18412d000 - 0x184132fff libmacho.dylib arm64  <850419a813223cd1bb9503ce69260633> /usr/lib/system/libmacho.dylib

              0x184133000 - 0x184134fff libremovefile.dylib arm64  <d3c2e06992b63a7f82c3fa9bc3063bf8> /usr/lib/system/libremovefile.dylib

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              0x1a5fa4000 - 0x1a5fcbfff CoreServicesInternal arm64  <60e1e8af6f4433d4a462ac72f72cc4f8> /System/Library/PrivateFrameworks/CoreServicesInternal.framework/CoreServicesInternal

              0x1a657d000 - 0x1a658efff libGSFontCache.dylib arm64  <d4088b263704312cbfbef3c0e8c26eb8> /System/Library/PrivateFrameworks/FontServices.framework/libGSFontCache.dylib

              0x1a658f000 - 0x1a65c1fff libTrueTypeScaler.dylib arm64  <63964522206d31ca9d7f5b9b78227abc> /System/Library/PrivateFrameworks/FontServices.framework/libTrueTypeScaler.dylib

              0x1a7d1f000 - 0x1a7d22fff InternationalSupport arm64  <6efcd0e042783733ac24282e37617085> /System/Library/PrivateFrameworks/InternationalSupport.framework/InternationalSupport

              0x1abbbd000 - 0x1abbeefff libclosured.dylib arm64  <56e1a40175843bda9c860bdbbcf1b0b5> /usr/lib/closure/libclosured.dylib

               

               

              EOF

            • Re: iOS11 watchdog timeout crashes (0x8badf00d) but code not on stack
              larslindback Level 1 Level 1 (0 points)

              Your Thread 0 looks a lot like the crash we are experiencing in iOS 11. This is ours:

              Exception Type:  EXC_CRASH (SIGKILL)
              Exception Codes: 0x0000000000000000, 0x0000000000000000
              Exception Note:  EXC_CORPSE_NOTIFY
              Termination Reason: Namespace <0xF>, Code 0x8badf00d
              Triggered by Thread:  0
              
              Filtered syslog:
              None found
              
              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
              

               

              For us the problem is that displaying notifications causes the app to crash (when the app is backgrounded). We have even created a test app (TestCrashInBackground that you see above) in which we can reproduce this issue. The app only displays a notification and doesn't have any background tasks.

              The test case is:

              1. App shows notification

              2. The user backgrounds the app (presses the home key).

              3. The user locks the screen

              Result: The OS kills the app after some (short) time.

               

              We have taken a sysdiagnose after this happens and we can see that when we display a notification an assertion with the name "will present notification" is added.

               

              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;
              }
              

               

              After about 45 seconds the app is killed because it "has active assertions beyond permitted time":

              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)
              

               

              All this just for displaying a notification... pretty serious bug!

               

              This is the code that adds the notification:

              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);
              }];
              

               

              I have filed a bug report to Apple (id: 34788843) with our test project and the sysdiagnose attached. Hopefully they will adress this issue soon.

                • Re: iOS11 watchdog timeout crashes (0x8badf00d) but code not on stack
                  Vocera Level 1 Level 1 (0 points)

                  Thanks larslindback,

                   

                  I have encounter same issue as your report. My scenario is :

                   

                  1) Reboot device.

                  2) Send  a couple message to App,

                  3) Since myApp is VoIP app.

                  4) App will be launched automatically.

                   

                  it is reproduced on iOS 11.x Hope Apple will be aware of this issue.

                    • Re: iOS11 watchdog timeout crashes (0x8badf00d) but code not on stack
                      eskimo Apple Staff Apple Staff (11,355 points)

                      Hope Apple will be aware of this issue.

                      We are indeed.  In iOS 11 the UserNotification framework is ‘leaking’ UIApplication background tasks (well, not those exactly, but an equivalent underlying system object).  larslindback’s bug (r. 34788843) was closed as a dup of another bug (r. 33765986) that is reported as fixed in the current iOS 11.2 beta 2 seed.  Please try that out and let us know if you still have the same problem there.

                      Share and Enjoy

                      Quinn “The Eskimo!”
                      Apple Developer Relations, Developer Technical Support, Core OS/Hardware
                      let myEmail = "eskimo" + "1" + "@apple.com"

                        • Re: iOS11 watchdog timeout crashes (0x8badf00d) but code not on stack
                          tmmiller Level 1 Level 1 (0 points)

                          I am seeing the issue in iOS 11.1.1.  I have the same issue as larslindback which is showing a notification and then seeing the crash after the app goes into the background.  My thread 0 in the log is identical to his.

                            • Re: iOS11 watchdog timeout crashes (0x8badf00d) but code not on stack
                              eskimo Apple Staff Apple Staff (11,355 points)

                              I am seeing the issue in iOS 11.1.1.

                              Please repeat your test on the latest iOS 11.2 beta seed and see whether that fixes the problem.

                              Share and Enjoy

                              Quinn “The Eskimo!”
                              Apple Developer Relations, Developer Technical Support, Core OS/Hardware
                              let myEmail = "eskimo" + "1" + "@apple.com"

                                • Re: iOS11 watchdog timeout crashes (0x8badf00d) but code not on stack
                                  tmmiller Level 1 Level 1 (0 points)

                                  I'm happy to report that I have tested with 11.2 and no longer see the problem.

                                  • Re: iOS11 watchdog timeout crashes (0x8badf00d) but code not on stack
                                    rickbdotcom Level 1 Level 1 (0 points)

                                    Still occuring on 11.2 for me. Almost every recent crash log on my device has this for the Termination Reason. My app, GooglePhotos, Gmail, AccuWeather, Twitter, even the MobileSMS process.

                                    • Re: iOS11 watchdog timeout crashes (0x8badf00d) but code not on stack
                                      BVDili Level 1 Level 1 (0 points)

                                      This is still occuring for our app in iOS v11.2.2 and we can't quite pinpoint if this is still an iOS system bug or an issue with our application. This seems to happen in a situation where the app is receiving push notifications and it randomly crashes in the background. On our devices we also see this same crash in several other popular applications.

                                       

                                      If this is an iOS system issue, any ideas when this will be fixed? Or can you confirm if this was already fixed in iOS and we need to do a deep dive in our app and see what the issue is...

                                       

                                      Here is an example of the crash we had on iOS v11.2.2

                                       

                                      Thanks!

                                       

                                      Incident Identifier: 2FACA0C8-479B-4AC1-9FFE-AB211B8E6FFF
                                      Beta Identifier:     1C8DA660-6C7F-4033-9308-4BAE0DF1AAA
                                      Hardware Model:      iPhone8,1
                                      Process:             MyApp [1913]
                                      Path:                /private/var/containers/Bundle/Application/AD535283-17C3-455A-B766-0E041E938D39/MyApp.app/MyApp
                                      Identifier:          com.MyApp.MyApp
                                      Version:             1.0.1.365 (1.0.1)
                                      Beta:                YES
                                      Code Type:           ARM-64 (Native)
                                      Role:                Foreground
                                      Parent Process:      launchd [1]
                                      Coalition:           com.MyApp.MyApp [857]
                                      
                                      
                                      
                                      
                                      Date/Time:           2018-01-09 14:23:56.8335 -0500
                                      Launch Time:         2018-01-09 12:18:44.9868 -0500
                                      OS Version:          iPhone OS 11.2.2 (15C202)
                                      Baseband Version:    4.30.02
                                      Report Version:      104
                                      
                                      
                                      Exception Type:  EXC_CRASH (SIGKILL)
                                      Exception Codes: 0x0000000000000000, 0x0000000000000000
                                      Exception Note:  EXC_CORPSE_NOTIFY
                                      Termination Reason: Namespace ASSERTIOND, Code 0x8badf00d
                                      Triggered by Thread:  0
                                      
                                      
                                      Filtered syslog:
                                      None found
                                      
                                      
                                      Thread 0 name:  Dispatch queue: com.apple.main-thread
                                      Thread 0 Crashed:
                                      0   libsystem_kernel.dylib         0x0000000183183568 mach_msg_trap + 8
                                      1   libsystem_kernel.dylib         0x00000001831833e0 mach_msg + 72
                                      2   CoreFoundation                 0x000000018363a308 __CFRunLoopServiceMachPort + 196
                                      3   CoreFoundation                 0x0000000183637ed4 __CFRunLoopRun + 1424
                                      4   CoreFoundation                 0x0000000183557e58 CFRunLoopRunSpecific + 436
                                      5   GraphicsServices               0x0000000185404f84 GSEventRunModal + 100
                                      6   UIKit                         0x000000018ccac67c UIApplicationMain + 236
                                      7   MyApp                       0x00000001008416e0 main + 18016
                                      8   libdyld.dylib                 0x000000018307456c start + 4
                                      
                                      
                                      Thread 1 name:  com.apple.uikit.eventfetch-thread
                                      Thread 1:
                                      0   libsystem_kernel.dylib         0x0000000183183568 mach_msg_trap + 8
                                      1   libsystem_kernel.dylib         0x00000001831833e0 mach_msg + 72
                                      2   CoreFoundation                 0x000000018363a308 __CFRunLoopServiceMachPort + 196
                                      3   CoreFoundation                 0x0000000183637ed4 __CFRunLoopRun + 1424
                                      4   CoreFoundation                 0x0000000183557e58 CFRunLoopRunSpecific + 436
                                      5   Foundation                     0x0000000183f8d594 -[NSRunLoop+ 50580 (NSRunLoop) runMode:beforeDate:] + 304
                                      6   Foundation                     0x0000000183fac9ac -[NSRunLoop+ 178604 (NSRunLoop) runUntilDate:] + 96
                                      7   UIKit                         0x000000018d8167b8 -[UIEventFetcher threadMain] + 136
                                      8   Foundation                     0x000000018408f0f4 __NSThread__start__ + 996
                                      9   libsystem_pthread.dylib       0x00000001832b82b4 _pthread_body + 308
                                      10  libsystem_pthread.dylib       0x00000001832b8180 _pthread_body + 0
                                      11  libsystem_pthread.dylib       0x00000001832b6b74 thread_start + 4
                                      
                                      
                                      Thread 2 name:  com.apple.NSURLConnectionLoader
                                      Thread 2:
                                      0   libsystem_kernel.dylib         0x0000000183183568 mach_msg_trap + 8
                                      1   libsystem_kernel.dylib         0x00000001831833e0 mach_msg + 72
                                      2   CoreFoundation                 0x000000018363a308 __CFRunLoopServiceMachPort + 196
                                      3   CoreFoundation                 0x0000000183637ed4 __CFRunLoopRun + 1424
                                      4   CoreFoundation                 0x0000000183557e58 CFRunLoopRunSpecific + 436
                                      5   CFNetwork                     0x0000000183e47128 -[__CoreSchedulingSetRunnable runForever] + 780
                                      6   Foundation                     0x000000018408f0f4 __NSThread__start__ + 996
                                      7   libsystem_pthread.dylib       0x00000001832b82b4 _pthread_body + 308
                                      8   libsystem_pthread.dylib       0x00000001832b8180 _pthread_body + 0
                                      9   libsystem_pthread.dylib       0x00000001832b6b74 thread_start + 4
                                      
                                      
                                      Thread 3 name:  com.apple.CFStream.LegacyThread
                                      Thread 3:
                                      0   libsystem_kernel.dylib         0x0000000183183568 mach_msg_trap + 8
                                      1   libsystem_kernel.dylib         0x00000001831833e0 mach_msg + 72
                                      2   CoreFoundation                 0x000000018363a308 __CFRunLoopServiceMachPort + 196
                                      3   CoreFoundation                 0x0000000183637ed4 __CFRunLoopRun + 1424
                                      4   CoreFoundation                 0x0000000183557e58 CFRunLoopRunSpecific + 436
                                      5   CoreFoundation                 0x0000000183649548 _legacyStreamRunLoop_workThread + 268
                                      6   libsystem_pthread.dylib       0x00000001832b82b4 _pthread_body + 308
                                      7   libsystem_pthread.dylib       0x00000001832b8180 _pthread_body + 0
                                      8   libsystem_pthread.dylib       0x00000001832b6b74 thread_start + 4
                                      
                                      
                                      Thread 4 name:  com.apple.CFSocket.private
                                      Thread 4:
                                      0   libsystem_kernel.dylib         0x00000001831a4534 __select + 8
                                      1   CoreFoundation                 0x0000000183642840 __CFSocketManager + 644
                                      2   libsystem_pthread.dylib       0x00000001832b82b4 _pthread_body + 308
                                      3   libsystem_pthread.dylib       0x00000001832b8180 _pthread_body + 0
                                      4   libsystem_pthread.dylib       0x00000001832b6b74 thread_start + 4
                                      
                                      
                                      Thread 5:
                                      0   libsystem_kernel.dylib         0x00000001831a4d80 __workq_kernreturn + 8
                                      1   libsystem_pthread.dylib       0x00000001832b7080 _pthread_wqthread + 1288
                                      2   libsystem_pthread.dylib       0x00000001832b6b6c start_wqthread + 4
                                      
                                      
                                      Thread 6:
                                      0   libsystem_pthread.dylib       0x00000001832b6b68 start_wqthread + 0
                                      
                                      
                                      Thread 7:
                                      0   libsystem_pthread.dylib       0x00000001832b6b68 start_wqthread + 0
                                      
                                      
                                      Thread 0 crashed with ARM Thread State (64-bit):
                                          x0: 0x0000000010004005   x1: 0x0000000007000806   x2: 0x0000000000000000   x3: 0x0000000000000c00
                                          x4: 0x0000000000001803   x5: 0x00000000ffffffff   x6: 0x0000000000000000   x7: 0x0000000000000000
                                          x8: 0x00000000fffffbbf   x9: 0x0000000007000000  x10: 0x0000000007000100  x11: 0x0000000000000040
                                         x12: 0xffffffffffffffff  x13: 0x0000000000000001  x14: 0x0064bd000064bd00  x15: 0x0000000000000000
                                         x16: 0xffffffffffffffe1  x17: 0x00000000ffffffff  x18: 0xfffffff01b89925c  x19: 0x0000000000000000
                                         x20: 0x00000000ffffffff  x21: 0x0000000000001803  x22: 0x0000000000000c00  x23: 0x000000016f8a4e38
                                         x24: 0x0000000007000806  x25: 0x0000000000000000  x26: 0x0000000007000806  x27: 0x0000000000000c00
                                         x28: 0x0000000000000001   fp: 0x000000016f8a4d30   lr: 0x00000001831833e0
                                          sp: 0x000000016f8a4ce0   pc: 0x0000000183183568 cpsr: 0x60000000
                                      
                                        • Re: iOS11 watchdog timeout crashes (0x8badf00d) but code not on stack
                                          eskimo Apple Staff Apple Staff (11,355 points)

                                          This is still occuring for our app in iOS v11.2.2 and we can't quite pinpoint if this is still an iOS system bug or an issue with our application.

                                          Indeed.  That’s because crashes like this can be caused by either:

                                          • Your app leaking background task assertion, for example, by calling -beginBackgroundTaskWithExpirationHandler: and then forgetting to call -endBackgroundTask:

                                          • The system frameworks doing a similar thing

                                          To distinguish between the two you should do two things:

                                          1. Make sure that that every background task assertion that your code starts (and this also means any library code you use) has a meaningful name.  That is, call -beginBackgroundTaskWithName:expirationHandler:, not -beginBackgroundTaskWithExpirationHandler:.

                                          2. Grab a sysdiagnose after you see this crash; see our Bug Reporting > Profiles and Logs for details on this.

                                          3. Look through the system log for the tell tale signs I described in my 3 Oct 2017 post.

                                          It’s a good idea to try out this process for yourself before you start debugging reports coming in from the field.  You can do this by deliberately leaking a background task assertion, as shown by the above-mentioned post.

                                          Finally, if you’re seeing crashes like this from any Apple apps (either built in to the OS or downloaded via the App Store), that’s definitely bugworthy in and of itself.

                                          Share and Enjoy

                                          Quinn “The Eskimo!”
                                          Apple Developer Relations, Developer Technical Support, Core OS/Hardware
                                          let myEmail = "eskimo" + "1" + "@apple.com"

                                            • Re: iOS11 watchdog timeout crashes (0x8badf00d) but code not on stack
                                              rickbdotcom Level 1 Level 1 (0 points)

                                              This is still occuring for my app and literally every single other app on my device that uses background notifications. GooglePhotos, Gmail, AccuWeather, Twitter (and once in the MobileSMS process) are we all doing something wrong or is it the OS? I filed a bug report with sysdiag, console logs, etc and the eventual response I got was "get a new battery" which seems somewhat unhelpful. I guess I tell my users this if they stop getting background notifications? I understand background notifications won't get deliveried if the device is in low power mode, but I was seeing this on newer devices and when it never hit low power mode. It's somewhat frustrating to actually see that the notifications are getting to the device but not delivered to the app after this crash occurs without opening the app again. All I want to do is send a background notification more or less reliably (or at the very least not have it shutoff completely w/o having to open the app again) every 15 minutes or so. I've looked at my code six ways to Sunday, and I don't see any incorrect usage of the background tasks.

                                                • Re: iOS11 watchdog timeout crashes (0x8badf00d) but code not on stack
                                                  eskimo Apple Staff Apple Staff (11,355 points)

                                                  I’m confused.  You wrote:

                                                  All I want to do is send a background notification more or less reliably (or at the very least not have it shutoff completely w/o having to open the app again) every 15 minutes or so.

                                                  and yet all the talk up thread has been about crashes.  Can you give us some more details on what you’re trying to achieve here?

                                                  Share and Enjoy

                                                  Quinn “The Eskimo!”
                                                  Apple Developer Relations, Developer Technical Support, Core OS/Hardware
                                                  let myEmail = "eskimo" + "1" + "@apple.com"

                                                • Re: iOS11 watchdog timeout crashes (0x8badf00d) but code not on stack
                                                  yossarian123 Level 1 Level 1 (0 points)

                                                  I'm seeing a similar issue on iOS 11.4.1.   Our app is using local notifications and we're seeing 0x8badf00d crashes.  When I inspect sysdiagnose logs I'm seeing this at the time of the crash (I'm stripping out my app's name from the logs):

                                                   

                                                   

                                                  [XXXXXX:5147] Forcing crash report with description: XXXX:5147 has active assertions beyond permitted time:

                                                  <BKProcessAssertion: 0x104c2dbb0; "will present notification" (notificationAction:30s); id:…5F2A1D500EB2> (owner: SpringBoard:4845)

                                                   

                                                  This doesn't seem to be caused by anything in our app - all of our background tasks have explicitly been given names so it's easier for us to debug.  Is this still an issue in 11.4?

                                                    • Re: iOS11 watchdog timeout crashes (0x8badf00d) but code not on stack
                                                      eskimo Apple Staff Apple Staff (11,355 points)

                                                      The original iOS 11 problem (r. 33765986) was definitely fixed in 11.2.  If you’re having problems on 11.4, that’s something new.  And I’ve not seen widespread reports of a problem like this on 11.4, leading me to suspect that there may be a problem with your code.  The one thing to be careful of is completion handlers.  When you get told about a notification (there are various APIs for thus, but a good example is -[UNUserNotificationCenterDelegate willPresentNotification:withCompletionHandler:]) you may be given a completion handler.  If you are given a completion handler, you must make sure to call it.  Failing to do that can leak assertions which results in death by food poisoning (‘ate bad food’ ;-).

                                                      Share and Enjoy

                                                      Quinn “The Eskimo!”
                                                      Apple Developer Relations, Developer Technical Support, Core OS/Hardware
                                                      let myEmail = "eskimo" + "1" + "@apple.com"