title: Unable to reproduce iOS App Review team Crash. Unity app with Vuforia
body: <p>We have submitted two apps recently (one new app, and one wich was an update of an already published app) and got the two rejected by the iOS app review team for the following reason : </p>
  
  <blockquote>
    <p>Guideline 2.1 - Performance
    Your app crashed on iPad or iPhone running iOS 11.2.5 connected to an IPv6 network during our review.</p>
  </blockquote>
  
  <p>Before submitting the apps we extensively tested them with testflight on 4 different devices and iOS versions and experienced no crash at all.
  We are unable to reproduce the crash the ios app review team experience </p>
  
  <p>Our dev environment is the same for the two apps, may be this is the cause of the crash : 
  Unity 2017.2.1f1 with Vuforia (this is an augmentented reality app), Xcode 9.2 (latest version)</p>
  
  <p>Herafter you will find the crashlog for the new app,( the updated app had an identical crashlog...), they are very similar : </p>
  
  <pre><code>The two crashlogs are very similar : 
  
  {"app_name":"ournewappname","timestamp":"2018-03-01 17:04:56.02 -0800","app_version":"1.0.1","slice_uuid":"af7e5c57-c2bc-3c91-8e1e-559acfccdb7f","adam_id":0,"build_version":"1","bundleID":"fr.ourcompany.ournewappname","share_with_app_devs":false,"is_first_party":false,"bug_type":"109","os_version":"iPhone OS 11.2.5 (15D60)","incident_id":"002164F5-FD42-4A49-BF58-E8C1CB773010","name":"ournewappname"}
  
  Incident Identifier: 002164F5-FD42-4A49-BF58-E8C1CB773010
  CrashReporter Key:   6fa54cb83ccb006df1d056599e75f6797f1ac664
  Hardware Model:      iPad5,1
  Device Model:        J96AP
  Process:             ournewappname [4216]
  Path:                /private/var/containers/Bundle/Application/752BA8CA-A7AE-4823-976E-1D5DEBD34B2E/ournewappname.app/ournewappname
  Identifier:          fr.ourcompany.ournewappname
  Version:             1 (1.0.1)
  Code Type:           ARM-64 (Native)
  Role:                Foreground
  Parent Process:      launchd.development [1]
  Coalition:           fr.ourcompany.ournewappname [1066]
  
  
  Date/Time:           2018-03-01 17:04:55.8059 -0800
  Launch Time:         2018-03-01 17:04:54.7575 -0800
  OS Version:          iPhone OS 11.2.5 (15D60)
  Baseband Version:    n/a
  UDID:                a728c3d680bc84aaaddc473d254d3c02a764955f
  Report Version:      104
  
  Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
  Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000088
  VM Region Info: 0x88 is not in any region.  Bytes before following region: 4301520760
        REGION TYPE                      START - END             [ VSIZE] PRT/MAX SHRMOD  REGION DETAIL
        UNUSED SPACE AT START
  ---&gt;  
        __TEXT                 0000000100640000-0000000100644000 [   16K] r-x/r-x SM=COW  ...ealtwrarcard]
  
  Termination Signal: Segmentation fault: 11
  Termination Reason: Namespace SIGNAL, Code 0xb
  Terminating Process: exc handler [0]
  Triggered by Thread:  0
  
  Filtered syslog:
  Timestamp               Thread     Type        Activity             PID
  2018-03-01 17:04:54.8314 -0800  0xfd29 1024 0x0 4216 AssertionServices: BKSWorkspace created.
  2018-03-01 17:04:54.9677 -0800  0xfd29 1024 0x0 4216 AccessibilitySettingsLoader: Loading settings loader: (system: 0)
  2018-03-01 17:04:54.9790 -0800  0xfd29 1024 0x0 4216 AccessibilitySettingsLoader: AXSettingsLoader told to start
  2018-03-01 17:04:54.9967 -0800  0xfd29 1024 0x0 4216 UIAccessibility: Starting accessibility server
  2018-03-01 17:04:55.1193 -0800  0xfd29 1024 0x0 4216 UIAccessibility: Started AXRuntime server: 0
  2018-03-01 17:04:55.1239 -0800  0xfd29 1024 0x0 4216 UIAccessibility: (null): Loading synchronously
  2018-03-01 17:04:55.1262 -0800  0xfd29 1024 0x0 4216 UIAccessibility: Main bundle finished loading: load type: 0 - is system app server: 0 (&lt;UIApplication: 0x113d0adb0&gt;)
  2018-03-01 17:04:55.2735 -0800  0xfd3c 1024 0x0 4216 FrontBoardServices: [FBSScene] [fr.ourcompany.ournewappname] Created client agent: &lt;UIApplicationSceneClientAgent: 0x1c401d120&gt;
  2018-03-01 17:04:55.2742 -0800  0xfd3c 1024 0x0 4216 FrontBoardServices: [FBSScene] [fr.ourcompany.ournewappname - AirPlay] Created client agent: &lt;UIApplicationSceneClientAgent: 0x1c001d3f0&gt;
  2018-03-01 17:04:55.7238 -0800  0xfd29 1024 0x0 4216 UIKit: View did appear: &lt;SplashScreenController: 0x113d6d690&gt; 1
  2018-03-01 17:04:55.7253 -0800  0xfd29 1024 0x0 4216 UIAccessibility: Did post notification. notification:  (1001) error:0 data:(null)
  2018-03-01 17:04:55.7334 -0800  0xfd29 1024 0x0 4216 UIAccessibility: Did post notification. notification:  (4002) error:0 data:{
      controllerClass = SplashScreenController;
      event = ViewDidAppear;
  }
  
  Thread 0 name:  Dispatch queue: com.apple.main-thread
  Thread 0 Crashed:
  0   ournewappname                   0x0000000100b3e9d8 0x100640000 + 5237208
  1   ournewappname                   0x000000010065339c 0x100640000 + 78748
  2   ournewappname                   0x0000000100653740 0x100640000 + 79680
  3   CoreFoundation                  0x00000001811c513c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 20 (CFNotificationCenter.c:661)
  4   CoreFoundation                  0x00000001811c46dc _CFXRegistrationPost + 420 (CFNotificationCenter.c:163)
  5   CoreFoundation                  0x00000001811c4440 ___CFXNotificationPost_block_invoke + 60 (CFNotificationCenter.c:1060)
  6   CoreFoundation                  0x0000000181241e24 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1408 (CFXNotificationRegistrar.m:163)
  7   CoreFoundation                  0x00000001810fad60 _CFXNotificationPost + 380 (CFNotificationCenter.c:1057)
  8   Foundation                      0x0000000181b27348 -[NSNotificationCenter postNotificationName:object:userInfo:] + 68 (NSNotification.m:543)
  9   UIKit                           0x000000018ad28a20 +[UIScreen _FBSDisplayConfigurationConnected:andNotify:] + 280 (UIScreen.m:599)
  10  UIKit                           0x000000018aa51060 -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 292 (UIApplication.m:3094)
  11  UIKit                           0x000000018ae66dbc -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 364 (UIApplicationSceneClientAgent.m:41)
  12  FrontBoardServices              0x00000001838f61f0 -[FBSSceneImpl _didCreateWithTransitionContext:completion:] + 364 (FBSSceneImpl.m:460)
  13  FrontBoardServices              0x00000001838feaf8 __56-[FBSWorkspace client:handleCreateScene:withCompletion:]_block_invoke_2 + 224 (FBSWorkspace.m:606)
  14  libdispatch.dylib               0x0000000180bb2a14 _dispatch_client_callout + 16 (object.m:502)
  15  libdispatch.dylib               0x0000000180bba200 _dispatch_block_invoke_direct$VARIANT$mp + 288 (queue.c:3025)
  16  FrontBoardServices              0x000000018392a7f8 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 36 (FBSSerialQueue.m:164)
  17  FrontBoardServices              0x000000018392a49c -[FBSSerialQueue _performNext] + 404 (FBSSerialQueue.m:196)
  18  FrontBoardServices              0x000000018392aa38 -[FBSSerialQueue _performNextFromRunLoopSource] + 56 (FBSSerialQueue.m:232)
  19  CoreFoundation                  0x00000001811db77c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24 (CFRunLoop.c:1982)
  20  CoreFoundation                  0x00000001811db6fc __CFRunLoopDoSource0 + 88 (CFRunLoop.c:2017)
  21  CoreFoundation                  0x00000001811daf84 __CFRunLoopDoSources0 + 204 (CFRunLoop.c:2053)
  22  CoreFoundation                  0x00000001811d8b5c __CFRunLoopRun + 1048 (CFRunLoop.c:2920)
  23  CoreFoundation                  0x00000001810f8c58 CFRunLoopRunSpecific + 436 (CFRunLoop.c:3245)
  24  GraphicsServices                0x0000000182fa4f84 GSEventRunModal + 100 (GSEvent.c:2245)
  25  UIKit                           0x000000018a8515c4 UIApplicationMain + 236 (UIApplication.m:3956)
  26  ournewappname                   0x0000000100645980 0x100640000 + 22912
  27  libdyld.dylib                   0x0000000180c1856c start + 4
  
  Thread 1:
  0   libsystem_pthread.dylib         0x0000000180e5ab68 start_wqthread + 0
  
  Thread 2:
  0   libsystem_pthread.dylib         0x0000000180e5ab68 start_wqthread + 0
  
  Thread 3 name:  Dispatch queue: com.apple.frontboardservices.workspace.client
  Thread 3:
  0   CoreFoundation                  0x00000001810f3d6c CFDataGetBytePtr + 88 (CFInternal.h:714)
  1   Foundation                      0x0000000181b3296c bytesInEncoding + 200 (NSStringEncodings.m:155)
  2   Foundation                      0x0000000181b3296c bytesInEncoding + 200 (NSStringEncodings.m:155)
  3   CoreFoundation                  0x0000000181104f6c -[__NSCFString UTF8String] + 80 (CFObject.m:228)
  4   BaseBoard                       0x0000000183703ee8 BSSerializeStringToXPCDictionaryWithKey + 44 (BSXPCSerialization.m:171)
  5   BaseBoard                       0x0000000183703ce8 BSSerializeBSXPCEncodableObjectToXPCDictionary + 52 (BSXPCSerialization.m:86)
  6   BaseBoard                       0x0000000183703ca4 BSCreateSerializedBSXPCEncodableObject + 56 (BSXPCSerialization.m:51)
  7   BaseBoard                       0x0000000183703d88 BSSerializeBSXPCEncodableObjectToXPCDictionaryWithKey + 40 (BSXPCSerialization.m:59)
  8   FrontBoardServices              0x00000001838f929c -[FBSWorkspaceSceneClientSettingsChangedEvent encodeWithXPCDictionary:] + 84 (FBSWorkspaceSceneClientSettingsChangedEvent.m:52)
  9   BaseBoard                       0x0000000183703ce8 BSSerializeBSXPCEncodableObjectToXPCDictionary + 52 (BSXPCSerialization.m:86)
  10  BaseBoard                       0x0000000183703ca4 BSCreateSerializedBSXPCEncodableObject + 56 (BSXPCSerialization.m:51)
  11  BaseBoard                       0x0000000183703d88 BSSerializeBSXPCEncodableObjectToXPCDictionaryWithKey + 40 (BSXPCSerialization.m:59)
  12  BaseBoard                       0x0000000183720a30 +[BSXPCMessage messageWithPacker:] + 96 (BSXPCMessage.m:33)
  13  BaseBoard                       0x000000018371db08 -[BSBaseXPCClient _sendMessage:withReplyHandler:waitForReply:waitDuration:] + 132 (BSBaseXPCClient.m:187)
  14  FrontBoardServices              0x0000000183918710 -[FBSWorkspaceClient _queue_sendMessage:withEvent:withResponseEvent:ofType:] + 144 (FBSWorkspaceClient.m:300)
  15  libdispatch.dylib               0x0000000180bb2a54 _dispatch_call_block_and_release + 24 (init.c:994)
  16  libdispatch.dylib               0x0000000180bb2a14 _dispatch_client_callout + 16 (object.m:502)
  17  libdispatch.dylib               0x0000000180bbc96c _dispatch_queue_serial_drain$VARIANT$mp + 528 (inline_internal.h:2500)
  18  libdispatch.dylib               0x0000000180bbd2fc _dispatch_queue_invoke$VARIANT$mp + 340 (queue.c:5302)
  19  libdispatch.dylib               0x0000000180bbdd20 _dispatch_root_queue_drain_deferred_wlh$VARIANT$mp + 404 (queue.c:5920)
  20  libdispatch.dylib               0x0000000180bc603c _dispatch_workloop_worker_thread$VARIANT$mp + 644 (source.c:2529)
  21  libsystem_pthread.dylib         0x0000000180e5af1c _pthread_wqthread + 932 (pthread.c:2207)
  22  libsystem_pthread.dylib         0x0000000180e5ab6c start_wqthread + 4
  
  Thread 4:
  0   libsystem_pthread.dylib         0x0000000180e5ab68 start_wqthread + 0
  
  Thread 5 name:  com.apple.uikit.eventfetch-thread
  Thread 5:
  0   libsystem_kernel.dylib          0x0000000180d27568 mach_msg_trap + 8
  1   libsystem_kernel.dylib          0x0000000180d273e0 mach_msg + 72 (mach_msg.c:103)
  2   CoreFoundation                  0x00000001811db108 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613)
  3   CoreFoundation                  0x00000001811d8cd4 __CFRunLoopRun + 1424 (CFRunLoop.c:2969)
  4   CoreFoundation                  0x00000001810f8c58 CFRunLoopRunSpecific + 436 (CFRunLoop.c:3245)
  5   Foundation                      0x0000000181b2d594 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 304 (NSRunLoop.m:367)
  6   Foundation                      0x0000000181b4c9ac -[NSRunLoop(NSRunLoop) runUntilDate:] + 96 (NSRunLoop.m:411)
  7   UIKit                           0x000000018b3bb7a8 -[UIEventFetcher threadMain] + 136 (UIEventFetcher.m:437)
  8   Foundation                      0x0000000181c2f0f4 __NSThread__start__ + 996 (NSThread.m:1181)
  9   libsystem_pthread.dylib         0x0000000180e5c2b4 _pthread_body + 308 (pthread.c:740)
  10  libsystem_pthread.dylib         0x0000000180e5c180 _pthread_start + 312 (pthread.c:799)
  11  libsystem_pthread.dylib         0x0000000180e5ab74 thread_start + 4
  
  Thread 6:
  0   libsystem_pthread.dylib         0x0000000180e5ab68 start_wqthread + 0
  
  Thread 7 name:  GC Finalizer
  Thread 7:
  0   libsystem_kernel.dylib          0x0000000180d480f0 __psynch_cvwait + 8
  1   libsystem_pthread.dylib         0x0000000180e5ece4 _pthread_cond_wait$VARIANT$mp + 640 (pthread_cond.c:579)
  2   ournewappname                   0x00000001012e86a8 0x100640000 + 13272744
  3   ournewappname                   0x00000001012cd658 0x100640000 + 13162072
  4   ournewappname                   0x00000001012e5400 0x100640000 + 13259776
  5   ournewappname                   0x00000001012e8df0 0x100640000 + 13274608
  6   libsystem_pthread.dylib         0x0000000180e5c2b4 _pthread_body + 308 (pthread.c:740)
  7   libsystem_pthread.dylib         0x0000000180e5c180 _pthread_start + 312 (pthread.c:799)
  8   libsystem_pthread.dylib         0x0000000180e5ab74 thread_start + 4
  
  Thread 8 name:  BatchDeleteObjects
  Thread 8:
  0   libsystem_kernel.dylib          0x0000000180d275a4 semaphore_wait_trap + 8
  1   libdispatch.dylib               0x0000000180bb4f04 _dispatch_sema4_wait$VARIANT$mp + 24 (lock.c:134)
  2   libdispatch.dylib               0x0000000180bb58b4 _dispatch_semaphore_wait_slow + 140 (semaphore.c:143)
  3   ournewappname                   0x0000000100d546b8 0x100640000 + 7423672
  4   ournewappname                   0x0000000100cd40dc 0x100640000 + 6897884
  5   ournewappname                   0x0000000100d53c8c 0x100640000 + 7421068
  6   libsystem_pthread.dylib         0x0000000180e5c2b4 _pthread_body + 308 (pthread.c:740)
  7   libsystem_pthread.dylib         0x0000000180e5c180 _pthread_start + 312 (pthread.c:799)
  8   libsystem_pthread.dylib         0x0000000180e5ab74 thread_start + 4
  
  Thread 9 name:  AsyncReadManager
  Thread 9:
  0   libsystem_kernel.dylib          0x0000000180d275a4 semaphore_wait_trap + 8
  1   libdispatch.dylib               0x0000000180bb4f04 _dispatch_sema4_wait$VARIANT$mp + 24 (lock.c:134)
  2   libdispatch.dylib               0x0000000180bb58b4 _dispatch_semaphore_wait_slow + 140 (semaphore.c:143)
  3   ournewappname                   0x0000000100c3c530 0x100640000 + 6276400
  4   ournewappname                   0x0000000100c3c074 0x100640000 + 6275188
  5   ournewappname                   0x0000000100d53c8c 0x100640000 + 7421068
  6   libsystem_pthread.dylib         0x0000000180e5c2b4 _pthread_body + 308 (pthread.c:740)
  7   libsystem_pthread.dylib         0x0000000180e5c180 _pthread_start + 312 (pthread.c:799)
  8   libsystem_pthread.dylib         0x0000000180e5ab74 thread_start + 4
  
  Thread 0 crashed with ARM Thread State (64-bit):
      x0: 0x0000000000000048   x1: 0x0000000000000000   x2: 0x0000000000000000   x3: 0x0000000101f8b03c
      x4: 0x0000000000000010   x5: 0x0000000000000001   x6: 0x0000000000000000   x7: 0x0000000000000403
      x8: 0x0000000101f8fa40   x9: 0x0000000000000001  x10: 0x0000000101f8ad60  x11: 0x0000000113d15730
     x12: 0x0000000101f8adb8  x13: 0x0000000000000002  x14: 0x0000000113e01680  x15: 0x016b5c01016b5cc0
     x16: 0x0000000180e51c60  x17: 0x0000000181b31d38  x18: 0xfffffff01210d25c  x19: 0x0000000000000002
     x20: 0x000000016f7bdc38  x21: 0x0000000101f8a000  x22: 0x0000000000000002  x23: 0x0000000000000000
     x24: 0x0000000000000002  x25: 0x000000016f7bdc38  x26: 0x0000000000000001  x27: 0x00000001b2373650
     x28: 0x0000000000000001   fp: 0x000000016f7bdb60   lr: 0x0000000100b3e9d8
      sp: 0x000000016f7bd9f0   pc: 0x0000000100b3e9d8 cpsr: 0x60000000
  </code></pre>
  
  <p>As we could not reproduce the crash its difficult to fix.
  In this crashlog there is something about SplashScreenController, so just in case we removed the splashscreen, and also changed Unity Version to 2017.3.1 and resubmitted the app...</p>
  
  <p>Any help would really be appreciated, perhaps we are missing some usefull information in the crash log ?</p>