38 Replies
      Latest reply: Oct 25, 2016 10:21 PM by simulgirl RSS
      petertoth Level 1 Level 1 (0 points)

        We encountered a large number of crashes reported by Crashlytics, but our development team was unable to reproduce it so far. It seems to happen after upgrading to iOS 9 or iOS 9.0.1.

         

        Here is the stacktrace from Crashlytics:

         

        Thread : Crashed: XPC API Misuse: Attempt to send a message expecting a reply to  (com.apple.networking.connection.0x15b636bc0)
        0  libxpc.dylib                   0x00000001999e288c _xpc_api_misuse + 52
        1  libxpc.dylib                   0x00000001999e288c _xpc_api_misuse + 52
        2  libxpc.dylib                   0x00000001999cdb38 _xpc_serializer_create
        3  libxpc.dylib                   0x00000001999cda1c xpc_connection_send_message + 80
        4  libsystem_network.dylib        0x0000000199930be0 net_helper_send + 256
        5  libsystem_network.dylib        0x000000019992bc94 tcp_connection_create_waiting_reply + 84
        6  libsystem_network.dylib        0x000000019992ee6c __tcp_connection_allocate_block_invoke + 224
        7  libsystem_network.dylib        0x000000019993424c __net_helper_endpoint_deliver_block_invoke_2 + 44
        8  libdispatch.dylib              0x00000001997897b0 _dispatch_call_block_and_release + 24
        9  libdispatch.dylib              0x0000000199789770 _dispatch_client_callout + 16
        10 libdispatch.dylib              0x000000019979575c _dispatch_queue_drain + 864
        11 libdispatch.dylib              0x000000019978d274 _dispatch_queue_invoke + 464
        12 libdispatch.dylib              0x000000019979762c _dispatch_root_queue_drain + 728
        13 libdispatch.dylib              0x000000019979734c _dispatch_worker_thread3 + 112
        14 libsystem_pthread.dylib        0x000000019999d478 _pthread_wqthread + 1092
        

         

        Does anybody know about what could be the cause of this crash? If so, is there a fix/workaround for it?

         

        Thanks,

        Peter

        • Re: XPC API Misuse - iOS 9 crash
          sumit.nathany Level 1 Level 1 (0 points)

          We have the exact same problem. Haven't found any solution till now

          • Re: XPC API Misuse - iOS 9 crash
            alanacity Level 1 Level 1 (0 points)

            We're encountering the same issue with iOS 9, 9.01 & 9.0.2.

             

            Stack trace is identical and we haven't found a fix yet. This looks like a bug coming from iOS9 specifically.

             

            0 libxpc.dylib 0x0000000198ff688c _xpc_api_misuse + 48
            1 libxpc.dylib 0x0000000198fe1b38 _xpc_connection_pack_message + 220
            2 libxpc.dylib 0x0000000198fe1a1c xpc_connection_send_message + 76
            3 libsystem_network.dylib 0x0000000198f44be0 net_helper_send + 252
            4 libsystem_network.dyib 0x0000000198f3fc94 tcp_connection_create_waiting_reply + 80
            5 libsystem_network.dylib 0x0000000198f42e6c __tcp_connection_allocate_block_invoke + 220
            6 libsystem_network.dylib 0x0000000198f4824c __net_helper_endpoint_deliver_block_invoke_2 + 40
            7 libdispatch.dylib 0x0000000198d9d7b0 _dispatch_call_block_and_release + 20
            8 libdispatch.dylib 0x0000000198d9d770 _dispatch_client_callout + 12
            9 libdispatch.dylib 0x0000000198da975c _dispatch_queue_drain + 860
            10 libdispatch.dylib 0x0000000198da1274 _dispatch_queue_invoke + 460
            11 libdispatch.dylib 0x0000000198dab62c _dispatch_root_queue_drain + 724
            12 libdispatch.dylib 0x0000000198dab34c _dispatch_worker_thread3 + 108
            13 libsystem_pthread.dylib 0x0000000198fb1478 _pthread_wqthread + 1088
            14 libsystem_pthread.dylib 0x0000000198fb1028 start_wqthread + 0
            
            
            
            

             

            Not sure if relevant but here's the memory usage for 1/3 of the total occurances of this bug.

             

            224 - 256  : Has the most occurances with 15

            352 - 384 : Has the less with 2

             

            Total occurances we're counting 41 for this specific instance. There are way more with different stacktraces and therefore I can't make an aggregate just now. I'm attaching a picture but I'm not sure I this forum will display it.

             

             

            I don't know where to start for debugging this or if it's better to wait for Apple to fix it. Do you know about a debugging plan to catch this kind of bugs ?

             

            Thanks

            • Re: XPC API Misuse - iOS 9 crash
              cosmac Level 1 Level 1 (0 points)

              I am seeing this as well.  Not sure how to proceed.

              • Re: XPC API Misuse - iOS 9 crash
                agitohu Level 1 Level 1 (0 points)

                I encounter this problem as well, anyone has idea yet?

                 

                additionlly, my crash report contain following log:

                 

                Beadcrmb Trail: (reverse chronological seconds)

                9358     GC Framework: startAuthenticationForExistingPrimaryPlayer

                12010     GC Framework: startAuthenticationForExistingPrimaryPlayer
                15585     GC Framework: startAuthenticationForExistingPrimaryPlayer

                • Re: XPC API Misuse - iOS 9 crash
                  Rajusa Level 1 Level 1 (0 points)

                  We have been hitting this issue as well.

                   

                  I am curious what is the top of the stack on your main thread when you hit this crash? For us it is in

                  static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void* info)

                  • Re: XPC API Misuse - iOS 9 crash
                    WeMa Mobile Level 1 Level 1 (0 points)

                    Always got some crashes on this issue.

                     

                    my crash:

                    Thread : Crashed: XPC API Misuse: Attempt to send a message expecting a reply to  (com.apple.networking.connection.0x176e81d0)
                    0  libxpc.dylib                   0x389d134a _xpc_api_misuse + 41
                    1  libsystem_c.dylib              0x388b09e5 __strlcpy_chk + 48
                    2  libxpc.dylib                   0x389c1f75 _xpc_serializer_create + 158
                    3  libxpc.dylib                   0x389c1ea1 xpc_connection_send_message + 60
                    4  libsystem_network.dylib        0x38952b39 net_helper_send + 316
                    5  libsystem_network.dylib        0x38946ae9 __tcp_connection_event_notify_block_invoke_2 + 16
                    6  libdispatch.dylib              0x38810ed7 _dispatch_call_block_and_release + 10
                    7  libdispatch.dylib              0x3881b04f _dispatch_queue_drain + 1762
                    8  libdispatch.dylib              0x3881402f _dispatch_queue_invoke + 282
                    9  libdispatch.dylib              0x3881c3dd _dispatch_root_queue_drain + 400
                    10 libdispatch.dylib              0x3881c24b _dispatch_worker_thread3 + 94
                    11 libsystem_pthread.dylib        0x389a5e29 _pthread_wqthread + 1024
                    12 libsystem_pthread.dylib        0x389a5a18 start_wqthread + 8
                    
                    • Re: XPC API Misuse - iOS 9 crash
                      totallyoleary Level 1 Level 1 (0 points)

                      From what I understand this error is related to ARC, it is caused by the xpc_release method being called one too many times.

                      I've noticed that the Swift Optimizer can over optimize ARC calls leading to crashes. I'm thinking that this could be related.

                      • Re: XPC API Misuse - iOS 9 crash
                        eskimo Apple Staff Apple Staff (6,480 points)

                        Has anyone filed a bug about this?  If so, please post your bug number.

                        Share and Enjoy

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

                          • Re: XPC API Misuse - iOS 9 crash
                            eskimo Apple Staff Apple Staff (6,480 points)

                            To answer my own question, at least one bug for this is (r. 22874333).

                            Share and Enjoy

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

                              • Re: XPC API Misuse - iOS 9 crash
                                eskimo Apple Staff Apple Staff (6,480 points)

                                That bug was dup’d to another (r. 21832853) which we believe is fixed in iOS 9.2.  If you see crashes like this (specifically, an “XPC API Misuse” crash where the immediate cause is net_helper_send calling xpc_connection_send_message) in iOS 9.2 or later, please let us know.

                                Share and Enjoy

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

                            • Re: XPC API Misuse - iOS 9 crash
                              borovdev Level 1 Level 1 (0 points)

                              Did anybody find a solution?

                                • Re: XPC API Misuse - iOS 9 crash
                                  eskimo Apple Staff Apple Staff (6,480 points)

                                  Are you asking for iOS 9.0..<9.2?  As I mentioned on 10 Dec, this was reported as fixed in iOS 9.2.

                                  Share and Enjoy

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

                                    • Re: XPC API Misuse - iOS 9 crash
                                      borovdev Level 1 Level 1 (0 points)

                                      We have one crash for  iOS 9.2.1 (OS Version: iPhone OS 9.2.1 (13D15))

                                       

                                      Thread 15 Crashed: 0 libxpc.dylib 0x00000001834fa8a4 _xpc_api_misuse + 52 1 libxpc.dylib 0x00000001834ea19c xpc_dictionary_set_value + 84 2 libxpc.dylib 0x00000001834e5664 xpc_dictionary_set_int64 + 48 3 libsystem_network.dylib 0x00000001834459b4 tcp_connection_create_waiting_reply + 76 4 libsystem_network.dylib 0x0000000183464cac __network_proxy_complete_block_invoke + 76 5 libdispatch.dylib 0x00000001832a1630 _dispatch_call_block_and_release + 20 6 libdispatch.dylib 0x00000001832a15f0 _dispatch_client_callout + 12 7 libdispatch.dylib 0x00000001832ad634 _dispatch_queue_drain + 860 8 libdispatch.dylib 0x00000001832a50f4 _dispatch_queue_invoke + 460 9 libdispatch.dylib 0x00000001832af504 _dispatch_root_queue_drain + 724 10 libdispatch.dylib 0x00000001832af224 _dispatch_worker_thread3 + 108 11 libsystem_pthread.dylib 0x00000001834b5470 _pthread_wqthread + 1088 12 libsystem_pthread.dylib 0x00000001834b5020 start_wqthread + 0

                                        • Re: XPC API Misuse - iOS 9 crash
                                          eskimo Apple Staff Apple Staff (6,480 points)

                                          It would help if you formatted your crash log excerpt as code.

                                          Share and Enjoy

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

                                            • Re: XPC API Misuse - iOS 9 crash
                                              borovdev Level 1 Level 1 (0 points)

                                              Thread 15 Crashed: 0 libxpc.dylib 0x00000001834fa8a4 _xpc_api_misuse + 52

                                              1 libxpc.dylib 0x00000001834ea19c xpc_dictionary_set_value + 84

                                              2 libxpc.dylib 0x00000001834e5664 xpc_dictionary_set_int64 + 48

                                              3 libsystem_network.dylib 0x00000001834459b4 tcp_connection_create_waiting_reply + 76

                                              4 libsystem_network.dylib 0x0000000183464cac __network_proxy_complete_block_invoke + 76

                                              5 libdispatch.dylib 0x00000001832a1630 _dispatch_call_block_and_release + 20

                                              6 libdispatch.dylib 0x00000001832a15f0 _dispatch_client_callout + 12

                                              7 libdispatch.dylib 0x00000001832ad634 _dispatch_queue_drain + 860

                                              8 libdispatch.dylib 0x00000001832a50f4 _dispatch_queue_invoke + 460

                                              9 libdispatch.dylib 0x00000001832af504 _dispatch_root_queue_drain + 724

                                              10 libdispatch.dylib 0x00000001832af224 _dispatch_worker_thread3 + 108

                                              11 libsystem_pthread.dylib 0x00000001834b5470 _pthread_wqthread + 1088

                                              12 libsystem_pthread.dylib 0x00000001834b5020 start_wqthread + 0

                                      • Re: XPC API Misuse - iOS 9 crash
                                        linded Level 1 Level 1 (0 points)

                                        Not sure if you got an answer, however, the the reason for the trap should be reported in log or crash dump when this occurs.  The routine _xpc_api_misuse in your stack trace takes a const char * as a single argument so if you run your app under debugger with a breakpoint set on _xpc_api_misuse and display string associated with the pointer in r0  or x0 depending on your arch should provide a clue. 

                                        • Re: XPC API Misuse - iOS 9 crash
                                          steffenfromnull Level 1 Level 1 (0 points)

                                          One of our user just encountered the same issue (Crashed: XPC API Misuse: Over-resume of a connection.) on an iPhone 5 with iOS 10.0.1. It's been reported: 28384630

                                            • Re: XPC API Misuse - iOS 9 crash
                                              akirmse Level 1 Level 1 (0 points)

                                              A user got this crash on iOS 10.0.2:

                                               

                                              Crashed: XPC API Misuse: Over-resume of a connection.
                                              0  libxpc.dylib                   0x188b666b0 _xpc_api_misuse + 48
                                              1  libxpc.dylib                   0x188b666b0 _xpc_api_misuse + 48
                                              2  libxpc.dylib                   0x188b52c08 xpc_connection_resume + 76
                                              3  CFNetwork                      0x18a14c500 -[__NSURLBackgroundSession setupXPCConnection] + 292
                                              4  CFNetwork                      0x18a14d260 -[__NSURLBackgroundSession ensureRemoteSession] + 64
                                              5  CFNetwork                      0x18a197bb4 -[__NSCFBackgroundSessionTask setTaskDescription:] + 52
                                              6  Peakbagger                     0x100235b3c -[ANSUploader startNewUploadRequest:filePath:uniqueName:] (ANSUploader.m:228)
                                              7  Peakbagger                     0x1002360a4 __72-[ANSUploader checkSession:forTasksMatchingDescription:completionBlock:]_block_invoke (ANSUploader.m:263)
                                              8  CFNetwork                      0x18a233978 __46-[NSURLSession getTasksWithCompletionHandler:]_block_invoke_2 + 232
                                              9  CFNetwork                      0x18a155d58 __67-[__NSURLBackgroundSession _onqueue_getTasksWithCompletionHandler:]_block_invoke + 28
                                              10 Foundation                     0x18a5417e4 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 16
                                              11 Foundation                     0x18a486358 -[NSBlockOperation main] + 96
                                              12 Foundation                     0x18a476954 -[__NSOperationInternal _start:] + 620
                                              13 Foundation                     0x18a543b90 __NSOQSchedule_f + 228
                                              14 libdispatch.dylib              0x1889091c0 _dispatch_client_callout + 16
                                              15 libdispatch.dylib              0x188917444 _dispatch_queue_serial_drain + 928
                                              16 libdispatch.dylib              0x18890c9a8 _dispatch_queue_invoke + 652
                                              17 libdispatch.dylib              0x18891938c _dispatch_root_queue_drain + 572
                                              18 libdispatch.dylib              0x1889190ec _dispatch_worker_thread3 + 124
                                              19 libsystem_pthread.dylib        0x188b112c8 _pthread_wqthread + 1288
                                              20 libsystem_pthread.dylib        0x188b10db4 start_wqthread + 4
                                              
                                                • Re: XPC API Misuse - iOS 9 crash
                                                  mattie Level 1 Level 1 (0 points)

                                                  Hey - Fabric developer here. Chiming in because our code appears in that stack trace. Of course, we only have visibility into crashes that have our code in it, so it's always hard to know if we are involved.

                                                   

                                                  I've filed a bug about this one: 28651745. While our use of NSURLSession's background upload facility has increased significantly recently, our pattern of usage hasn't changed. This particular crash also appears to happen exclusively in iOS 10.

                                                    • Re: XPC API Misuse - iOS 9 crash
                                                      gmcnaughton Level 1 Level 1 (0 points)

                                                      Hi Mattie,

                                                       

                                                      If it helps, we just got a similar crash recorded in Fabric with an identical stack trace. From iOS 10.0.2 (iPhone 6; Crashlytics SDK 3.8.1):

                                                       

                                                      Crashed: XPC API Misuse: Over-resume of a connection.
                                                      0  libxpc.dylib                   0x185fe26b0 _xpc_api_misuse + 48
                                                      1  libxpc.dylib                   0x185fe26b0 _xpc_api_misuse + 48
                                                      2  libxpc.dylib                   0x185fcec08 xpc_connection_resume + 76
                                                      3  CFNetwork                      0x1875c8500 -[__NSURLBackgroundSession setupXPCConnection] + 292
                                                      4  CFNetwork                      0x1875c9260 -[__NSURLBackgroundSession ensureRemoteSession] + 64
                                                      5  CFNetwork                      0x187613bb4 -[__NSCFBackgroundSessionTask setTaskDescription:] + 52
                                                      6  Curious                        0x1002f4df0 -[ANSUploader startNewUploadRequest:filePath:uniqueName:] + 4298132976
                                                      7  Curious                        0x1002f5358 __72-[ANSUploader checkSession:forTasksMatchingDescription:completionBlock:]_block_invoke + 4298134360
                                                      8  CFNetwork                      0x1876af978 __46-[NSURLSession getTasksWithCompletionHandler:]_block_invoke_2 + 232
                                                      9  CFNetwork                      0x1875d1d58 __67-[__NSURLBackgroundSession _onqueue_getTasksWithCompletionHandler:]_block_invoke + 28
                                                      10 Foundation                     0x1879bd7e4 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 16
                                                      11 Foundation                     0x187902358 -[NSBlockOperation main] + 96
                                                      12 Foundation                     0x1878f2954 -[__NSOperationInternal _start:] + 620
                                                      13 Foundation                     0x1879bfb90 __NSOQSchedule_f + 228
                                                      14 libdispatch.dylib              0x185d851c0 _dispatch_client_callout + 16
                                                      15 libdispatch.dylib              0x185d93444 _dispatch_queue_serial_drain + 928
                                                      16 libdispatch.dylib              0x185d889a8 _dispatch_queue_invoke + 652
                                                      17 libdispatch.dylib              0x185d9538c _dispatch_root_queue_drain + 572
                                                      18 libdispatch.dylib              0x185d950ec _dispatch_worker_thread3 + 124
                                                      19 libsystem_pthread.dylib        0x185f8d2c8 _pthread_wqthread + 1288
                                                      20 libsystem_pthread.dylib        0x185f8cdb4 start_wqthread + 4
                                                      
                                                      
                                                      
                                                      • Re: XPC API Misuse - iOS 9 crash
                                                        gabriel-streetbees Level 1 Level 1 (0 points)

                                                        We also had the crash with iOS 10.

                                                         

                                                        http://stackoverflow.com/questions/39644292/crashed-xpc-api-misuse-over-resume-of-a-connection

                                                         

                                                        Device: iPhone 6+
                                                        iOS: 10.0.1

                                                         

                                                        The stack trace is:

                                                         

                                                            Crashed: XPC API Misuse: Over-resume of a connection.
                                                            0  libxpc.dylib                   0x18eb526b0 _xpc_api_misuse + 48
                                                            1  libxpc.dylib                   0x18eb526b0 _xpc_api_misuse + 48
                                                            2  libxpc.dylib                   0x18eb3ec08 xpc_connection_resume + 76
                                                            3  CFNetwork                      0x190138500 -[__NSURLBackgroundSession setupXPCConnection] + 292
                                                            4  CFNetwork                      0x190139260 -[__NSURLBackgroundSession ensureRemoteSession] + 64
                                                            5  libdispatch.dylib              0x18e8f5200 _dispatch_call_block_and_release + 24
                                                            6  libdispatch.dylib              0x18e8f51c0 _dispatch_client_callout + 16
                                                            7  libdispatch.dylib              0x18e903444 _dispatch_queue_serial_drain + 928
                                                            8  libdispatch.dylib              0x18e8f89a8 _dispatch_queue_invoke + 652
                                                            9  libdispatch.dylib              0x18e903940 _dispatch_queue_override_invoke + 360
                                                            10 libdispatch.dylib              0x18e90538c _dispatch_root_queue_drain + 572
                                                            11 libdispatch.dylib              0x18e9050ec _dispatch_worker_thread3 + 124
                                                            12 libsystem_pthread.dylib        0x18eafd2c8 _pthread_wqthread + 1288
                                                            13 libsystem_pthread.dylib        0x18eafcdb4 start_wqthread + 4
                                                        
                                                          • Re: XPC API Misuse - iOS 9 crash
                                                            eskimo Apple Staff Apple Staff (6,480 points)

                                                            Folks, it would help if you each filed your own bug report about this including, at a minimum, a crash report.  Ideally it’d best if you could also include a small test project that reproduces the problem, although I realise that can be tricky when the bug is hard to reproduce.

                                                            If you do file a bug report, please post the number here, just for the record.


                                                            @mattie, I took a look at your bug report (r. 28651745) and it seems to be waiting input from you.

                                                            Share and Enjoy

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

                                                              • Re: XPC API Misuse - iOS 9 crash
                                                                mattie Level 1 Level 1 (0 points)

                                                                Hey @eskimo !

                                                                 

                                                                That radar is indeed waiting for my input. But, the request was to attach Apple-generated reports. As I indicated when originally filing the report, I'm afraid I don't have access to end-users or developers' Apple crashes. I'm attempting to track some down from our customers. If anyone following along has a relevent Apple crash report, it would be greatly appreciated.

                                                                • Re: XPC API Misuse - iOS 9 crash
                                                                  simulgirl Level 1 Level 1 (0 points)

                                                                  Did this get resolved? My app keeps crashing at start, opens only on the third attempt. Crashlytics shows the same stack trace. I cannot replicate this bug! So not sure if reporting this as a bug will help. FYI: this specific crash has happened on iOS10.0.2, iPhone 6. But I have seen this bug happening on other devices as well.

                                                                  #11. Crashed: XPC API Misuse: Over-resume of a connection.

                                                                  0  libxpc.dylib                  0x187dca6b0 _xpc_api_misuse + 48

                                                                  1  libxpc.dylib                  0x187dca6b0 _xpc_api_misuse + 48

                                                                  2  libxpc.dylib                  0x187db6c08 xpc_connection_resume + 76

                                                                  3  CFNetwork                      0x1893b0500 -[__NSURLBackgroundSession setupXPCConnection] + 292

                                                                  4  CFNetwork                      0x1893b1260 -[__NSURLBackgroundSession ensureRemoteSession] + 64

                                                                  5  libdispatch.dylib              0x187b6d200 _dispatch_call_block_and_release + 24

                                                                  6  libdispatch.dylib              0x187b6d1c0 _dispatch_client_callout + 16

                                                                  7  libdispatch.dylib              0x187b7b444 _dispatch_queue_serial_drain + 928

                                                                  8  libdispatch.dylib              0x187b709a8 _dispatch_queue_invoke + 652

                                                                  9  libdispatch.dylib              0x187b7b940 _dispatch_queue_override_invoke + 360

                                                                  10 libdispatch.dylib              0x187b7d38c _dispatch_root_queue_drain + 572

                                                                  11 libdispatch.dylib              0x187b7d0ec _dispatch_worker_thread3 + 124

                                                                  12 libsystem_pthread.dylib        0x187d752c8 _pthread_wqthread + 1288

                                                                  13 libsystem_pthread.dylib        0x187d74db4 start_wqthread + 4

                                                                    • Re: XPC API Misuse - iOS 9 crash
                                                                      eskimo Apple Staff Apple Staff (6,480 points)

                                                                      Did this get resolved?

                                                                      Which bug?  The backtrace that started this thread runs through the TCP connection subsystem (tcp_connection_create_waiting_reply in frame 5), which looks very different from the backtrace you’re posting, which runs through NSURLSession background sessions (-[__NSURLBackgroundSession setupXPCConnection] in frame 3), which looks very different from the backtrace in mattie’s bug (r. 28651745).

                                                                      So not sure if reporting this as a bug will help.

                                                                      You should definitely file your own bug about this, even if you can’t reproduce the problem.  Make sure to attach a good selection of the crash reports you’ve got.

                                                                      Please post your bug number, just for the record.

                                                                      Share and Enjoy

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