Crashing -[NSProgress _setRemoteValues:forKeys:]

Hi all,


We're seeing a high number of crashes reported by Fabric as a crash in `-[NSProgress _setRemoteValues:forKeys:]` or `-[_NSProgressProxy _setRemoteValues:forKeys:]` on the main thread and on a thread labeled as `com.apple.NSXPCConnection.m-user.com.apple.ProgressReporting`, on iOS 11.


Crashed: com.apple.NSXPCConnection.m-user.com.apple.ProgressReporting
0  libobjc.A.dylib                0x1805e41a0 objc_retain + 16
1  libsystem_blocks.dylib         0x180da0cc8 _Block_object_assign + 204
2  libsystem_blocks.dylib         0x180da0964 _Block_copy + 140
3  CoreFoundation                 0x1812d9474 CFRunLoopPerformBlock + 660
4  Foundation                     0x181f90470 -[_NSProgressProxy _setRemoteValues:forKeys:] + 108
5  Foundation                     0x181f91c2c -[_NSProgressSubscriber observePublisherForID:values:forKeys:] + 376
6  Foundation                     0x181f76984 __NSXPCCONNECTION_IS_CALLING_OUT_TO_EXPORTED_OBJECT_S3__ + 24
7  Foundation                     0x181d756f4 -[NSXPCConnection _decodeAndInvokeMessageWithEvent:flags:] + 2456
8  Foundation                     0x181d97ac0 message_handler + 240
9  libxpc.dylib                   0x18106f004 _xpc_connection_call_event_handler + 68
10 libxpc.dylib                   0x18106c998 _xpc_connection_mach_event + 984
11 libdispatch.dylib              0x180d00b30 _dispatch_client_callout4 + 16
12 libdispatch.dylib              0x180d17440 _dispatch_mach_msg_invoke$VARIANT$mp + 352
13 libdispatch.dylib              0x180d0a86c _dispatch_queue_serial_drain$VARIANT$mp + 280
14 libdispatch.dylib              0x180d17eec _dispatch_mach_invoke$VARIANT$mp + 508
15 libdispatch.dylib              0x180d0a86c _dispatch_queue_serial_drain$VARIANT$mp + 280
16 libdispatch.dylib              0x180d0b2fc _dispatch_queue_invoke$VARIANT$mp + 336
17 libdispatch.dylib              0x180d0bcc8 _dispatch_root_queue_drain_deferred_wlh$VARIANT$mp + 340
18 libdispatch.dylib              0x180d14098 _dispatch_workloop_worker_thread$VARIANT$mp + 668
19 libsystem_pthread.dylib        0x181033e70 _pthread_wqthread + 860
20 libsystem_pthread.dylib        0x181033b08 start_wqthread + 4


and


Crashed: com.apple.main-thread
0  libobjc.A.dylib                0x18051c910 objc_msgSend + 16
1  Foundation                     0x181eca930 -[NSProgress _setRemoteValues:forKeys:] + 192
2  Foundation                     0x181ed04c0 __45-[_NSProgressProxy _setRemoteValues:forKeys:]_block_invoke + 52
3  CoreFoundation                 0x1812f72bc __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 20
4  CoreFoundation                 0x1812f6a7c __CFRunLoopDoBlocks + 264
5  CoreFoundation                 0x1812f4abc __CFRunLoopRun + 2004
6  CoreFoundation                 0x181214da8 CFRunLoopRunSpecific + 552
7  GraphicsServices               0x1831f7020 GSEventRunModal + 100
8  UIKit                          0x18b1f578c UIApplicationMain + 236
9  LogTen Pro                     0x102d47930 main (main.m:16)
10 libdyld.dylib                  0x180ca5fc0 start + 4


Apple Crash reporting is not reporting this specific crash, but the most prominent crash being reported is a SIGKILL presumably due to a deadlock over contention for adding/removing background tasks whcih seems to be inline with discussions here related to NSCPCConnection in which @eskimo (Hi Quinn!) mentions a bug in the background session hanlding:


"...AFAICT this crash is caused by NSURLSession's background session support. This passes work to its daemon (nsurlsessiond) using NSXPCConnection (not part of the iOS SDK, but public API on OS X, so you can read up about it there). NSXPCConnection has the notion of interrupted connections, that is, the IPC connection between the client and the server has torn but can be re-established. NSURLSession's background session support, like all NSXPCConnection clients, must handle these interruptions as a matter of course."


So I'm wondering if these two crashes are related (or the same) and just being reported differently by the different tools, and what (of course) we can do to prevent the crashing.


It certainly seems like the stack trace indicates that CoreData starts its own background task when saving, so there is no need to wrap the save in one ourselves. Can anyone confirm?


Many thanks,


Levi


Here's the related Apple Crash Log:


Incident Identifier: D4DEEBF5-F63E-4DE1-8BAC-1E4298803B6C
CrashReporter Key:   483c0e7f16d9fd187f82b409b416fe6d95432926
Hardware Model:      iPad6,4
Process:             LogTen Pro [301]
Path:                /private/var/containers/Bundle/Application/EE52C22E-F5DC-47EB-AE05-E9BB4DA3425C/LogTen Pro.app/LogTen Pro
Identifier:          com.coradine.iOS.LogTenProX
Version:             11044 (7.5.6)
Code Type:           ARM-64 (Native)
Role:                Foreground
Parent Process:      launchd [1]
Coalition:           com.coradine.iOS.LogTenProX [465]




Date/Time:           2018-06-13 14:47:00.4795 +0800
Launch Time:         2018-06-13 14:46:43.7212 +0800
OS Version:          iPhone OS 11.4 (15F79)
Baseband Version:    4.60.00
Report Version:      104


Exception Type:  EXC_CRASH (SIGKILL)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Termination Reason: Namespace ASSERTIOND, Code 0xbada5e47
Triggered by Thread:  0


Thread 0 name:
Thread 0 Crashed:
0   libsystem_kernel.dylib         0x0000000185597e08 mach_msg_trap + 8
1   libsystem_kernel.dylib         0x0000000185597c80 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                 0x0000000185adae40 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613)
3   CoreFoundation                 0x0000000185ad8908 __CFRunLoopRun + 1568 (CFRunLoop.c:2969)
4   CoreFoundation                 0x00000001859f8da8 CFRunLoopRunSpecific + 552 (CFRunLoop.c:3245)
5   GraphicsServices               0x00000001879dd020 GSEventRunModal + 100 (GSEvent.c:2245)
6   UIKit                         0x000000018fa15758 UIApplicationMain + 236 (UIApplication.m:3965)
7   LogTen Pro                     0x00000001029e7930 main + 88 (main.m:16)
8   libdyld.dylib                 0x0000000185489fc0 start + 4


Thread 1 name:
Thread 1:
0   libsystem_kernel.dylib         0x00000001855b9118 __psynch_mutexdrop + 8
1   libsystem_pthread.dylib       0x000000018575ca34 _pthread_mutex_unlock_drop + 48 (pthread_mutex.c:927)
2   CoreFoundation                 0x0000000185b6ad28 -[CFPrefsSource mergeIntoDictionary:sourceDictionary:] + 168 (CFPrefsSource.h:122)
3   CoreFoundation                 0x0000000185acf330 -[CFPrefsSearchListSource alreadylocked_copyDictionary] + 632 (CFPrefsSearchListSource.m:1053)
4   CoreFoundation                 0x0000000185acd524 -[CFPrefsSearchListSource alreadylocked_copyValueForKey:] + 88 (CFPrefsSearchListSource.m:553)
5   CoreFoundation                 0x0000000185b6a89c -[CFPrefsSource copyValueForKey:] + 64 (CFPrefsSource.m:809)
6   CoreFoundation                 0x0000000185b74a80 __76-[_CFXPreferences copyAppValueForKey:identifier:container:configurationURL:]_block_invoke + 40 (CFXPreferences.m:881)
7   CoreFoundation                 0x0000000185ad0d6c __108-[_CFXPreferences(SearchListAdditions) withSearchListForIdentifier:container:cloudConfigurationURL:perform:]_block_invoke + 268 (CFPrefsSearchListSource.m:1531)
8   CoreFoundation                 0x0000000185ad0588 normalizeQuintuplet + 356 (CFPrefsSearchListSource.m:63)
9   CoreFoundation                 0x0000000185ad0c54 -[_CFXPreferences(SearchListAdditions) withSearchListForIdentifier:container:cloudConfigurationURL:perform:] + 108 (CFPrefsSearchListSource.m:1409)
10  CoreFoundation                 0x0000000185b74a18 -[_CFXPreferences copyAppValueForKey:identifier:container:configurationURL:] + 124 (CFXPreferences.m:877)
11  CoreFoundation                 0x0000000185b772b4 _CFPreferencesCopyAppValueWithContainer + 116 (CFXPreferences.m:1628)
12  Foundation                     0x000000018646c2fc -[NSUserDefaults(NSUserDefaults) objectForKey:] + 52 (NSUserDefaults.m:224)
13  LogTen Pro                     0x0000000102aabe78 -[FIRAUserDefaults objectForKey:] + 264
14  LogTen Pro                     0x0000000102a98310 __37-[FIRAPersistedConfig midnightOffset]_block_invoke + 56
15  libdispatch.dylib             0x0000000185424a60 _dispatch_client_callout + 16 (object.m:507)
16  libdispatch.dylib             0x000000018542d5bc _dispatch_queue_barrier_sync_invoke_and_complete + 56 (queue.c:3682)
17  LogTen Pro                     0x0000000102a981e0 -[FIRAPersistedConfig midnightOffset] + 156
18  LogTen Pro                     0x0000000102a751c0 -[FIRADatabase dailyCounts:] + 56
19  LogTen Pro                     0x0000000102a8a024 __43-[FIRAMeasurement writeEventOnWorkerQueue:]_block_invoke.1000 + 76
20  LogTen Pro                     0x0000000102a6b6f8 -[FIRASqliteStore performTransaction:] + 92
21  LogTen Pro                     0x0000000102a89bfc -[FIRAMeasurement writeEventOnWorkerQueue:] + 1176
22  LogTen Pro                     0x0000000102a89618 -[FIRAMeasurement handleEventOnWorkerQueue:] + 384
23  LogTen Pro                     0x0000000102a9c6c0 __52-[FIRAScheduler scheduleOnWorkerQueueBlockID:block:]_block_invoke + 48
24  libdispatch.dylib             0x0000000185424aa0 _dispatch_call_block_and_release + 24 (init.c:994)
25  libdispatch.dylib             0x0000000185424a60 _dispatch_client_callout + 16 (object.m:507)
26  libdispatch.dylib             0x000000018542e9b4 _dispatch_queue_serial_drain$VARIANT$mp + 608 (inline_internal.h:2500)
27  libdispatch.dylib             0x000000018542f2fc _dispatch_queue_invoke$VARIANT$mp + 336 (queue.c:5290)
28  libdispatch.dylib             0x000000018542fcc8 _dispatch_root_queue_drain_deferred_wlh$VARIANT$mp + 340 (queue.c:5908)
29  libdispatch.dylib             0x0000000185438098 _dispatch_workloop_worker_thread$VARIANT$mp + 668 (source.c:2529)
30  libsystem_pthread.dylib       0x0000000185757e70 _pthread_wqthread + 860 (pthread.c:2218)
31  libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 2 name:
Thread 2:
0   libsystem_kernel.dylib         0x0000000185597e08 mach_msg_trap + 8
1   libsystem_kernel.dylib         0x0000000185597c80 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                 0x0000000185adae40 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613)
3   CoreFoundation                 0x0000000185ad8908 __CFRunLoopRun + 1568 (CFRunLoop.c:2969)
4   CoreFoundation                 0x00000001859f8da8 CFRunLoopRunSpecific + 552 (CFRunLoop.c:3245)
5   Foundation                     0x000000018646d674 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 304 (NSRunLoop.m:367)
6   Foundation                     0x000000018646d51c -[NSRunLoop(NSRunLoop) runUntilDate:] + 148 (NSRunLoop.m:411)
7   UIKit                         0x000000018f6fa768 -[UIEventFetcher threadMain] + 136 (UIEventFetcher.m:437)
8   Foundation                     0x000000018657defc __NSThread__start__ + 1040 (NSThread.m:1181)
9   libsystem_pthread.dylib       0x0000000185759220 _pthread_body + 272 (pthread.c:740)
10  libsystem_pthread.dylib       0x0000000185759110 _pthread_start + 292 (pthread.c:799)
11  libsystem_pthread.dylib       0x0000000185757b10 thread_start + 4


Thread 3:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 4:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 5:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 6:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x0000000185757eb4 _pthread_wqthread + 928 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 7 name:
Thread 7:
0   libsystem_kernel.dylib         0x0000000185597e08 mach_msg_trap + 8
1   libsystem_kernel.dylib         0x0000000185597c80 mach_msg + 72 (mach_msg.c:103)
2   LogTen Pro                     0x0000000102a13ea8 CLSMachExceptionServer + 100
3   libsystem_pthread.dylib       0x0000000185759220 _pthread_body + 272 (pthread.c:740)
4   libsystem_pthread.dylib       0x0000000185759110 _pthread_start + 292 (pthread.c:799)
5   libsystem_pthread.dylib       0x0000000185757b10 thread_start + 4


Thread 8 name:
Thread 8:
0   libsystem_kernel.dylib         0x0000000185597e08 mach_msg_trap + 8
1   libsystem_kernel.dylib         0x0000000185597c80 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                 0x0000000185adae40 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613)
3   CoreFoundation                 0x0000000185ad8908 __CFRunLoopRun + 1568 (CFRunLoop.c:2969)
4   CoreFoundation                 0x00000001859f8da8 CFRunLoopRunSpecific + 552 (CFRunLoop.c:3245)
5   Foundation                     0x000000018646d674 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 304 (NSRunLoop.m:367)
6   Foundation                     0x00000001864e21a8 -[NSRunLoop(NSRunLoop) run] + 88 (NSRunLoop.m:389)
7   LogTen Pro                     0x00000001029e9fe0 +[GAI threadMain:] + 64
8   Foundation                     0x000000018657defc __NSThread__start__ + 1040 (NSThread.m:1181)
9   libsystem_pthread.dylib       0x0000000185759220 _pthread_body + 272 (pthread.c:740)
10  libsystem_pthread.dylib       0x0000000185759110 _pthread_start + 292 (pthread.c:799)
11  libsystem_pthread.dylib       0x0000000185757b10 thread_start + 4


Thread 9:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x0000000185757eb4 _pthread_wqthread + 928 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 10:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 11:
0   libsystem_kernel.dylib         0x00000001855b90f4 __psynch_cvwait + 8
1   libsystem_pthread.dylib       0x000000018575bc90 _pthread_cond_wait$VARIANT$mp + 644 (pthread_cond.c:579)
2   libc++.1.dylib                 0x0000000184c6f25c std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 24 (__threading_support:278)
3   JavaScriptCore                 0x000000018d17f460 void std::__1::condition_variable_any::wait<std::__1::unique_lock >(std::__1::unique_lock&) + 104 (condition_variable:204)
4   JavaScriptCore                 0x000000018d17f074 bmalloc::Scavenger::threadRunLoop() + 164 (condition_variable:213)
5   JavaScriptCore                 0x000000018d17ee1c bmalloc::Scavenger::threadEntryPoint(bmalloc::Scavenger*) + 12 (Scavenger.cpp:143)
6   JavaScriptCore                 0x000000018d17f238 void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct=""> >, void (*)(bmalloc::Scavenger*), bmalloc::Scavenger*> >(void*) + 44 (type_traits:4323)
7   libsystem_pthread.dylib       0x0000000185759220 _pthread_body + 272 (pthread.c:740)
8   libsystem_pthread.dylib       0x0000000185759110 _pthread_start + 292 (pthread.c:799)
9   libsystem_pthread.dylib       0x0000000185757b10 thread_start + 4


Thread 12 name:
Thread 12:
0   libsystem_kernel.dylib         0x0000000185597e08 mach_msg_trap + 8
1   libsystem_kernel.dylib         0x0000000185597c80 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                 0x0000000185adae40 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613)
3   CoreFoundation                 0x0000000185ad8908 __CFRunLoopRun + 1568 (CFRunLoop.c:2969)
4   CoreFoundation                 0x00000001859f8da8 CFRunLoopRunSpecific + 552 (CFRunLoop.c:3245)
5   WebCore                       0x000000018dcba2d0 RunWebThread(void*) + 592 (WebCoreThread.mm:624)
6   libsystem_pthread.dylib       0x0000000185759220 _pthread_body + 272 (pthread.c:740)
7   libsystem_pthread.dylib       0x0000000185759110 _pthread_start + 292 (pthread.c:799)
8   libsystem_pthread.dylib       0x0000000185757b10 thread_start + 4


Thread 13 name:
Thread 13:
0   libsystem_kernel.dylib         0x0000000185597e08 mach_msg_trap + 8
1   libsystem_kernel.dylib         0x0000000185597c80 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                 0x0000000185adae40 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613)
3   CoreFoundation                 0x0000000185ad8908 __CFRunLoopRun + 1568 (CFRunLoop.c:2969)
4   CoreFoundation                 0x00000001859f8da8 CFRunLoopRunSpecific + 552 (CFRunLoop.c:3245)
5   CFNetwork                     0x00000001863066e0 -[__CoreSchedulingSetRunnable runForever] + 220 (CoreSchedulingSet.mm:1365)
6   Foundation                     0x000000018657defc __NSThread__start__ + 1040 (NSThread.m:1181)
7   libsystem_pthread.dylib       0x0000000185759220 _pthread_body + 272 (pthread.c:740)
8   libsystem_pthread.dylib       0x0000000185759110 _pthread_start + 292 (pthread.c:799)
9   libsystem_pthread.dylib       0x0000000185757b10 thread_start + 4


Thread 14:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 15:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 16:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 17:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 18:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 19:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 20:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x0000000185757eb4 _pthread_wqthread + 928 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 21:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x0000000185757eb4 _pthread_wqthread + 928 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 22 name:
Thread 22:
0   libsystem_kernel.dylib         0x00000001855b913c __psynch_mutexwait + 8
1   libsystem_pthread.dylib       0x000000018575c604 _pthread_mutex_lock_wait + 96 (pthread_mutex.c:722)
2   libsystem_pthread.dylib       0x000000018575c550 _pthread_mutex_lock_slow$VARIANT$mp + 260 (pthread_mutex.c:809)
3   libobjc.A.dylib               0x0000000184cf8d74 recursive_mutex_tt::lock() + 16 (objc-os.h:851)
4   libobjc.A.dylib               0x0000000184cfc610 objc_sync_enter + 28 (objc-sync.mm:291)
5   LogTen Pro                     0x00000001028fcd10 -[CASOperationLedger unregisterCloudOperationHash:] + 68 (CASOperationLedger.m:86)
6   LogTen Pro                     0x00000001027ea268 __46+[CASCloudSyncManager registerCloudOperation:]_block_invoke + 76 (CASCloudSyncManager.m:166)
7   Foundation                     0x0000000186559a3c __103+[__NSOperationInternal _observeValueForKeyPath:ofObject:changeKind:oldValue:newValue:indexes:context:]_block_invoke.122 + 28 (NSOperation.m:964)
8   libdispatch.dylib             0x0000000185424aa0 _dispatch_call_block_and_release + 24 (init.c:994)
9   libdispatch.dylib             0x0000000185424a60 _dispatch_client_callout + 16 (object.m:507)
10  libdispatch.dylib             0x000000018542bb84 _dispatch_queue_override_invoke$VARIANT$mp + 716 (inline_internal.h:2500)
11  libdispatch.dylib             0x0000000185431cac _dispatch_root_queue_drain + 588 (inline_internal.h:2539)
12  libdispatch.dylib             0x00000001854319fc _dispatch_worker_thread3 + 120 (queue.c:6092)
13  libsystem_pthread.dylib       0x0000000185757fac _pthread_wqthread + 1176 (pthread.c:2297)
14  libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 23:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 24 name:
Thread 24:
0   libsystem_kernel.dylib         0x00000001855b913c __psynch_mutexwait + 8
1   libsystem_pthread.dylib       0x000000018575c604 _pthread_mutex_lock_wait + 96 (pthread_mutex.c:722)
2   libsystem_pthread.dylib       0x000000018575c550 _pthread_mutex_lock_slow$VARIANT$mp + 260 (pthread_mutex.c:809)
3   libobjc.A.dylib               0x0000000184cf8d74 recursive_mutex_tt::lock() + 16 (objc-os.h:851)
4   libobjc.A.dylib               0x0000000184cfc610 objc_sync_enter + 28 (objc-sync.mm:291)
5   LogTen Pro                     0x00000001028fcd10 -[CASOperationLedger unregisterCloudOperationHash:] + 68 (CASOperationLedger.m:86)
6   LogTen Pro                     0x00000001027ea268 __46+[CASCloudSyncManager registerCloudOperation:]_block_invoke + 76 (CASCloudSyncManager.m:166)
7   Foundation                     0x0000000186559a3c __103+[__NSOperationInternal _observeValueForKeyPath:ofObject:changeKind:oldValue:newValue:indexes:context:]_block_invoke.122 + 28 (NSOperation.m:964)
8   libdispatch.dylib             0x0000000185424aa0 _dispatch_call_block_and_release + 24 (init.c:994)
9   libdispatch.dylib             0x0000000185424a60 _dispatch_client_callout + 16 (object.m:507)
10  libdispatch.dylib             0x000000018542bb84 _dispatch_queue_override_invoke$VARIANT$mp + 716 (inline_internal.h:2500)
11  libdispatch.dylib             0x0000000185431cac _dispatch_root_queue_drain + 588 (inline_internal.h:2539)
12  libdispatch.dylib             0x00000001854319fc _dispatch_worker_thread3 + 120 (queue.c:6092)
13  libsystem_pthread.dylib       0x0000000185757fac _pthread_wqthread + 1176 (pthread.c:2297)
14  libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 25 name:
Thread 25:
0   libsystem_kernel.dylib         0x00000001855ba7c8 kevent_id + 8
1   libdispatch.dylib             0x0000000185440574 _dispatch_kq_poll + 208 (event_kevent.c:644)
2   libdispatch.dylib             0x0000000185440f20 _dispatch_event_loop_wait_for_ownership$VARIANT$mp + 420 (event_kevent.c:2009)
3   libdispatch.dylib             0x0000000185432b18 _dispatch_sync_wait + 420 (queue.c:4185)
4   AssertionServices             0x00000001881a6d64 -[BKSAssertion invalidate] + 84 (BKSAssertion.m:162)
5   UIKit                         0x000000018f827ac4 -[_UIBackgroundTaskInfo invalidate] + 44 (UIApplication.m:897)
6   UIKit                         0x000000018f827a30 -[UIApplication _endBackgroundTask:] + 84 (UIApplication.m:11926)
7   LogTen Pro                     0x00000001028fce24 -[CASOperationLedger unregisterCloudOperationHash:] + 344 (CASOperationLedger.m:92)
8   LogTen Pro                     0x00000001027ea268 __46+[CASCloudSyncManager registerCloudOperation:]_block_invoke + 76 (CASCloudSyncManager.m:166)
9   Foundation                     0x0000000186559a3c __103+[__NSOperationInternal _observeValueForKeyPath:ofObject:changeKind:oldValue:newValue:indexes:context:]_block_invoke.122 + 28 (NSOperation.m:964)
10  libdispatch.dylib             0x0000000185424aa0 _dispatch_call_block_and_release + 24 (init.c:994)
11  libdispatch.dylib             0x0000000185424a60 _dispatch_client_callout + 16 (object.m:507)
12  libdispatch.dylib             0x000000018542bb84 _dispatch_queue_override_invoke$VARIANT$mp + 716 (inline_internal.h:2500)
13  libdispatch.dylib             0x0000000185431cac _dispatch_root_queue_drain + 588 (inline_internal.h:2539)
14  libdispatch.dylib             0x00000001854319fc _dispatch_worker_thread3 + 120 (queue.c:6092)
15  libsystem_pthread.dylib       0x0000000185757fac _pthread_wqthread + 1176 (pthread.c:2297)
16  libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 26:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 27:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 28 name:
Thread 28:
0   CoreFoundation                 0x00000001859f5cb8 _CFArrayReplaceValues + 180 (CFInternal.h:0)
1   CoreFoundation                 0x00000001859f5bf4 CFArrayAppendValue + 236 (CFArray.c:723)
2   CoreFoundation                 0x00000001859f5bf4 CFArrayAppendValue + 236 (CFArray.c:723)
3   CoreData                       0x0000000188408188 calculateNextBranchOperation + 732 (NSKnownKeysDictionary.m:444)
4   CoreData                       0x0000000188407de4 makeBranchRow + 848 (NSKnownKeysDictionary.m:580)
5   CoreData                       0x00000001884079bc -[NSKnownKeysMappingStrategy1 _makeBranchTableForKeys:count:] + 636 (NSKnownKeysDictionary.m:667)
6   CoreData                       0x00000001884075e8 -[NSKnownKeysMappingStrategy1 _coreCreationForKeys:count:] + 264 (NSKnownKeysDictionary.m:692)
7   CoreData                       0x00000001884074c8 -[NSKnownKeysMappingStrategy1 initForKeys:count:] + 88 (NSKnownKeysDictionary.m:746)
8   CoreData                       0x000000018840aae8 +[NSKnownKeysDictionary1 initWithObjects:forKeys:count:] + 80 (NSKnownKeysDictionary.m:1134)
9   CoreData                       0x0000000188409908 -[NSSQLEntity _generateProperties] + 1736 (NSSQLEntity.m:888)
10  CoreData                       0x0000000188406938 -[NSSQLModel _generateModel:error:] + 1232 (NSSQLModel.m:165)
11  CoreData                       0x000000018857489c -[NSSQLModel initWithManagedObjectModel:configurationName:retainHashHack:brokenHashVersion:entityIDOffset:] + 356 (NSSQLModel.m:45)
12  CoreData                       0x0000000188404bc0 -[NSSQLCore initWithPersistentStoreCoordinator:configurationName:URL:options:] + 940 (NSSQLCore.m:551)
13  CoreData                       0x0000000188510f30 __91-[NSPersistentStoreCoordinator addPersistentStoreWithType:configuration:URL:options:error:]_block_invoke + 1456 (NSPersistentStoreCoordinator.m:1576)
14  CoreData                       0x000000018851efb0 gutsOfBlockToNSPersistentStoreCoordinatorPerform + 212 (NSPersistentStoreCoordinator.m:341)
15  libdispatch.dylib             0x0000000185424a60 _dispatch_client_callout + 16 (object.m:507)
16  libdispatch.dylib             0x000000018542d5bc _dispatch_queue_barrier_sync_invoke_and_complete + 56 (queue.c:3682)
17  CoreData                       0x000000018850d3dc _perform + 200 (NSPersistentStoreCoordinator.m:463)
18  CoreData                       0x0000000188402e20 -[NSPersistentStoreCoordinator addPersistentStoreWithType:configuration:URL:options:error:] + 384 (NSPersistentStoreCoordinator.m:1441)
19  LogTen Pro                     0x00000001027c7f1c +[CASCloudSyncCoreDataController stackForStoreAtURL:readOnly:] + 540 (CASCloudSyncCoreDataController.m:767)
20  LogTen Pro                     0x0000000102986940 -[CASCloudImportOperation safeMain] + 416 (CASCloudImportOperation.m:62)
21  LogTen Pro                     0x0000000102972a9c -[CASCloudSyncOperation main] + 40 (CASCloudSyncOperation.m:131)
22  Foundation                     0x000000018649bcac -[__NSOperationInternal _start:] + 848 (NSOperation.m:830)
23  Foundation                     0x000000018655c76c __NSOQSchedule_f + 404 (NSOperation.m:2081)
24  libdispatch.dylib             0x0000000185424a60 _dispatch_client_callout + 16 (object.m:507)
25  libdispatch.dylib             0x000000018542ce94 _dispatch_continuation_pop$VARIANT$mp + 424 (inline_internal.h:2500)
26  libdispatch.dylib             0x000000018542b7cc _dispatch_async_redirect_invoke$VARIANT$mp + 604 (queue.c:3422)
27  libdispatch.dylib             0x0000000185431cac _dispatch_root_queue_drain + 588 (inline_internal.h:2539)
28  libdispatch.dylib             0x00000001854319fc _dispatch_worker_thread3 + 120 (queue.c:6092)
29  libsystem_pthread.dylib       0x0000000185757fac _pthread_wqthread + 1176 (pthread.c:2297)
30  libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 29:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 30:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 31:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 32:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x0000000185757eb4 _pthread_wqthread + 928 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 33:
0   libsystem_pthread.dylib       0x0000000185757b04 start_wqthread + 0 (pthread.c:2458)


Thread 34:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 35:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 36 name:
Thread 36:
0   libsystem_kernel.dylib         0x00000001855b913c __psynch_mutexwait + 8
1   libsystem_pthread.dylib       0x000000018575c604 _pthread_mutex_lock_wait + 96 (pthread_mutex.c:722)
2   libsystem_pthread.dylib       0x000000018575c550 _pthread_mutex_lock_slow$VARIANT$mp + 260 (pthread_mutex.c:809)
3   libobjc.A.dylib               0x0000000184cf8d74 recursive_mutex_tt::lock() + 16 (objc-os.h:851)
4   libobjc.A.dylib               0x0000000184cfc610 objc_sync_enter + 28 (objc-sync.mm:291)
5   LogTen Pro                     0x00000001028fc9e8 -[CASOperationLedger registerCloudOperationHash:] + 68 (CASOperationLedger.m:59)
6   LogTen Pro                     0x00000001027ea13c +[CASCloudSyncManager registerCloudOperation:] + 144 (CASCloudSyncManager.m:156)
7   LogTen Pro                     0x00000001029728b8 -[CASCloudSyncOperation initWithSyncRequest:] + 388 (CASCloudSyncOperation.m:103)
8   LogTen Pro                     0x000000010298671c -[CASCloudImportOperation initWithSyncRequest:fromCloudLogbookURL:] + 84 (CASCloudImportOperation.m:26)
9   LogTen Pro                     0x000000010293ee9c -[CASCloudImporter enqueueImportRequest:storeURL:] + 136 (CASCloudImporter.m:411)
10  LogTen Pro                     0x000000010293ea64 -[CASCloudImporter processNextSyncRequest] + 532 (CASCloudImporter.m:371)
11  Foundation                     0x000000018655ae88 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 16 (NSOperation.m:1467)
12  Foundation                     0x000000018649c8d0 -[NSBlockOperation main] + 72 (NSOperation.m:1486)
13  Foundation                     0x000000018649bcac -[__NSOperationInternal _start:] + 848 (NSOperation.m:830)
14  libdispatch.dylib             0x0000000185424a60 _dispatch_client_callout + 16 (object.m:507)
15  libdispatch.dylib             0x000000018542c170 _dispatch_block_invoke_direct$VARIANT$mp + 224 (queue.c:3018)
16  libdispatch.dylib             0x0000000185424a60 _dispatch_client_callout + 16 (object.m:507)
17  libdispatch.dylib             0x000000018542c170 _dispatch_block_invoke_direct$VARIANT$mp + 224 (queue.c:3018)
18  libdispatch.dylib             0x000000018542c05c dispatch_block_perform$VARIANT$mp + 104 (queue.c:2990)
19  Foundation                     0x000000018655c750 __NSOQSchedule_f + 376 (NSOperation.m:2086)
20  libdispatch.dylib             0x0000000185424a60 _dispatch_client_callout + 16 (object.m:507)
21  libdispatch.dylib             0x000000018542ce94 _dispatch_continuation_pop$VARIANT$mp + 424 (inline_internal.h:2500)
22  libdispatch.dylib             0x000000018542b7cc _dispatch_async_redirect_invoke$VARIANT$mp + 604 (queue.c:3422)
23  libdispatch.dylib             0x0000000185431cac _dispatch_root_queue_drain + 588 (inline_internal.h:2539)
24  libdispatch.dylib             0x00000001854319fc _dispatch_worker_thread3 + 120 (queue.c:6092)
25  libsystem_pthread.dylib       0x0000000185757fac _pthread_wqthread + 1176 (pthread.c:2297)
26  libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 37:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x0000000185757eb4 _pthread_wqthread + 928 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 38:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 39 name:
Thread 39:
0   libsystem_kernel.dylib         0x00000001855b913c __psynch_mutexwait + 8
1   libsystem_pthread.dylib       0x000000018575c604 _pthread_mutex_lock_wait + 96 (pthread_mutex.c:722)
2   libsystem_pthread.dylib       0x000000018575c550 _pthread_mutex_lock_slow$VARIANT$mp + 260 (pthread_mutex.c:809)
3   libobjc.A.dylib               0x0000000184cf8d74 recursive_mutex_tt::lock() + 16 (objc-os.h:851)
4   libobjc.A.dylib               0x0000000184cfc610 objc_sync_enter + 28 (objc-sync.mm:291)
5   LogTen Pro                     0x00000001028fcd10 -[CASOperationLedger unregisterCloudOperationHash:] + 68 (CASOperationLedger.m:86)
6   LogTen Pro                     0x00000001027ea268 __46+[CASCloudSyncManager registerCloudOperation:]_block_invoke + 76 (CASCloudSyncManager.m:166)
7   Foundation                     0x0000000186559a3c __103+[__NSOperationInternal _observeValueForKeyPath:ofObject:changeKind:oldValue:newValue:indexes:context:]_block_invoke.122 + 28 (NSOperation.m:964)
8   libdispatch.dylib             0x0000000185424aa0 _dispatch_call_block_and_release + 24 (init.c:994)
9   libdispatch.dylib             0x0000000185424a60 _dispatch_client_callout + 16 (object.m:507)
10  libdispatch.dylib             0x000000018542bb84 _dispatch_queue_override_invoke$VARIANT$mp + 716 (inline_internal.h:2500)
11  libdispatch.dylib             0x0000000185431cac _dispatch_root_queue_drain + 588 (inline_internal.h:2539)
12  libdispatch.dylib             0x00000001854319fc _dispatch_worker_thread3 + 120 (queue.c:6092)
13  libsystem_pthread.dylib       0x0000000185757fac _pthread_wqthread + 1176 (pthread.c:2297)
14  libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 40 name:
Thread 40:
0   libsystem_kernel.dylib         0x0000000185597e08 mach_msg_trap + 8
1   libsystem_kernel.dylib         0x0000000185597c80 mach_msg + 72 (mach_msg.c:103)
2   libdispatch.dylib             0x000000018543a834 _dispatch_mach_send_and_wait_for_reply + 560 (mach.c:831)
3   libdispatch.dylib             0x000000018543ad2c dispatch_mach_send_with_result_and_wait_for_reply$VARIANT$mp + 56 (mach.c:1958)
4   libxpc.dylib                   0x00000001857946bc xpc_connection_send_message_with_reply_sync + 196 (connection.c:802)
5   BaseBoard                     0x0000000188159fdc -[BSXPCMessage sendSynchronouslyToConnection:error:] + 76 (BSXPCMessage.m:189)
6   BaseBoard                     0x00000001881567ac -[BSBaseXPCClient _sendMessage:withReplyHandler:waitForReply:waitDuration:] + 316 (BSBaseXPCClient.m:233)
7   AssertionServices             0x00000001881a997c -[BKSAssertionClientMultiplexer sendEvent:withAssertionType:forEventType:responseHandler:] + 256 (BKSAssertionClientMultiplexer.m:87)
8   AssertionServices             0x00000001881a38a8 -[BKSProcessAssertionClient sendCreateEvent:error:] + 116 (BKSProcessAssertionClient.m:53)
9   AssertionServices             0x00000001881a72c4 -[BKSAssertion _clientQueue_acquireAssertion] + 136 (BKSAssertion.m:293)
10  AssertionServices             0x00000001881a6ef8 __45-[BKSAssertion _registerAssertionAndAcquire:]_block_invoke + 80 (BKSAssertion.m:235)
11  libdispatch.dylib             0x0000000185424aa0 _dispatch_call_block_and_release + 24 (init.c:994)
12  libdispatch.dylib             0x0000000185424a60 _dispatch_client_callout + 16 (object.m:507)
13  libdispatch.dylib             0x000000018542e9b4 _dispatch_queue_serial_drain$VARIANT$mp + 608 (inline_internal.h:2500)
14  libdispatch.dylib             0x000000018542f2fc _dispatch_queue_invoke$VARIANT$mp + 336 (queue.c:5290)
15  libdispatch.dylib             0x000000018542fcc8 _dispatch_root_queue_drain_deferred_wlh$VARIANT$mp + 340 (queue.c:5908)
16  libdispatch.dylib             0x0000000185438098 _dispatch_workloop_worker_thread$VARIANT$mp + 668 (source.c:2529)
17  libsystem_pthread.dylib       0x0000000185757e70 _pthread_wqthread + 860 (pthread.c:2218)
18  libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 41 name:
Thread 41:
0   libsystem_kernel.dylib         0x00000001855b913c __psynch_mutexwait + 8
1   libsystem_pthread.dylib       0x000000018575c604 _pthread_mutex_lock_wait + 96 (pthread_mutex.c:722)
2   libsystem_pthread.dylib       0x000000018575c550 _pthread_mutex_lock_slow$VARIANT$mp + 260 (pthread_mutex.c:809)
3   libobjc.A.dylib               0x0000000184cf8d74 recursive_mutex_tt::lock() + 16 (objc-os.h:851)
4   libobjc.A.dylib               0x0000000184cfc610 objc_sync_enter + 28 (objc-sync.mm:291)
5   LogTen Pro                     0x00000001028fcd10 -[CASOperationLedger unregisterCloudOperationHash:] + 68 (CASOperationLedger.m:86)
6   LogTen Pro                     0x00000001027ea268 __46+[CASCloudSyncManager registerCloudOperation:]_block_invoke + 76 (CASCloudSyncManager.m:166)
7   Foundation                     0x0000000186559a3c __103+[__NSOperationInternal _observeValueForKeyPath:ofObject:changeKind:oldValue:newValue:indexes:context:]_block_invoke.122 + 28 (NSOperation.m:964)
8   libdispatch.dylib             0x0000000185424aa0 _dispatch_call_block_and_release + 24 (init.c:994)
9   libdispatch.dylib             0x0000000185424a60 _dispatch_client_callout + 16 (object.m:507)
10  libdispatch.dylib             0x000000018542bb84 _dispatch_queue_override_invoke$VARIANT$mp + 716 (inline_internal.h:2500)
11  libdispatch.dylib             0x0000000185431cac _dispatch_root_queue_drain + 588 (inline_internal.h:2539)
12  libdispatch.dylib             0x00000001854319fc _dispatch_worker_thread3 + 120 (queue.c:6092)
13  libsystem_pthread.dylib       0x0000000185757fac _pthread_wqthread + 1176 (pthread.c:2297)
14  libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 42 name:
Thread 42:
0   libsystem_kernel.dylib         0x00000001855b913c __psynch_mutexwait + 8
1   libsystem_pthread.dylib       0x000000018575c604 _pthread_mutex_lock_wait + 96 (pthread_mutex.c:722)
2   libsystem_pthread.dylib       0x000000018575c550 _pthread_mutex_lock_slow$VARIANT$mp + 260 (pthread_mutex.c:809)
3   libobjc.A.dylib               0x0000000184cf8d74 recursive_mutex_tt::lock() + 16 (objc-os.h:851)
4   libobjc.A.dylib               0x0000000184cfc610 objc_sync_enter + 28 (objc-sync.mm:291)
5   LogTen Pro                     0x00000001028fcd10 -[CASOperationLedger unregisterCloudOperationHash:] + 68 (CASOperationLedger.m:86)
6   LogTen Pro                     0x00000001027ea268 __46+[CASCloudSyncManager registerCloudOperation:]_block_invoke + 76 (CASCloudSyncManager.m:166)
7   Foundation                     0x0000000186559a3c __103+[__NSOperationInternal _observeValueForKeyPath:ofObject:changeKind:oldValue:newValue:indexes:context:]_block_invoke.122 + 28 (NSOperation.m:964)
8   libdispatch.dylib             0x0000000185424aa0 _dispatch_call_block_and_release + 24 (init.c:994)
9   libdispatch.dylib             0x0000000185424a60 _dispatch_client_callout + 16 (object.m:507)
10  libdispatch.dylib             0x000000018542bb84 _dispatch_queue_override_invoke$VARIANT$mp + 716 (inline_internal.h:2500)
11  libdispatch.dylib             0x0000000185431cac _dispatch_root_queue_drain + 588 (inline_internal.h:2539)
12  libdispatch.dylib             0x00000001854319fc _dispatch_worker_thread3 + 120 (queue.c:6092)
13  libsystem_pthread.dylib       0x0000000185757fac _pthread_wqthread + 1176 (pthread.c:2297)
14  libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 43:
0   libsystem_kernel.dylib         0x00000001855b9d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x00000001857580a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 44 name:
Thread 44:
0   libsystem_kernel.dylib         0x00000001855b913c __psynch_mutexwait + 8
1   libsystem_pthread.dylib       0x000000018575c604 _pthread_mutex_lock_wait + 96 (pthread_mutex.c:722)
2   libsystem_pthread.dylib       0x000000018575c550 _pthread_mutex_lock_slow$VARIANT$mp + 260 (pthread_mutex.c:809)
3   libobjc.A.dylib               0x0000000184cf8d74 recursive_mutex_tt::lock() + 16 (objc-os.h:851)
4   libobjc.A.dylib               0x0000000184cfc610 objc_sync_enter + 28 (objc-sync.mm:291)
5   LogTen Pro                     0x00000001028fcd10 -[CASOperationLedger unregisterCloudOperationHash:] + 68 (CASOperationLedger.m:86)
6   LogTen Pro                     0x00000001027ea268 __46+[CASCloudSyncManager registerCloudOperation:]_block_invoke + 76 (CASCloudSyncManager.m:166)
7   Foundation                     0x0000000186559a3c __103+[__NSOperationInternal _observeValueForKeyPath:ofObject:changeKind:oldValue:newValue:indexes:context:]_block_invoke.122 + 28 (NSOperation.m:964)
8   libdispatch.dylib             0x0000000185424aa0 _dispatch_call_block_and_release + 24 (init.c:994)
9   libdispatch.dylib             0x0000000185424a60 _dispatch_client_callout + 16 (object.m:507)
10  libdispatch.dylib             0x000000018542bb84 _dispatch_queue_override_invoke$VARIANT$mp + 716 (inline_internal.h:2500)
11  libdispatch.dylib             0x0000000185431cac _dispatch_root_queue_drain + 588 (inline_internal.h:2539)
12  libdispatch.dylib             0x00000001854319fc _dispatch_worker_thread3 + 120 (queue.c:6092)
13  libsystem_pthread.dylib       0x0000000185757fac _pthread_wqthread + 1176 (pthread.c:2297)
14  libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 45 name:
Thread 45:
0   libsystem_kernel.dylib         0x00000001855b913c __psynch_mutexwait + 8
1   libsystem_pthread.dylib       0x000000018575c604 _pthread_mutex_lock_wait + 96 (pthread_mutex.c:722)
2   libsystem_pthread.dylib       0x000000018575c550 _pthread_mutex_lock_slow$VARIANT$mp + 260 (pthread_mutex.c:809)
3   libobjc.A.dylib               0x0000000184cf8d74 recursive_mutex_tt::lock() + 16 (objc-os.h:851)
4   libobjc.A.dylib               0x0000000184cfc610 objc_sync_enter + 28 (objc-sync.mm:291)
5   LogTen Pro                     0x00000001028fcd10 -[CASOperationLedger unregisterCloudOperationHash:] + 68 (CASOperationLedger.m:86)
6   LogTen Pro                     0x00000001027ea268 __46+[CASCloudSyncManager registerCloudOperation:]_block_invoke + 76 (CASCloudSyncManager.m:166)
7   Foundation                     0x0000000186559a3c __103+[__NSOperationInternal _observeValueForKeyPath:ofObject:changeKind:oldValue:newValue:indexes:context:]_block_invoke.122 + 28 (NSOperation.m:964)
8   libdispatch.dylib             0x0000000185424aa0 _dispatch_call_block_and_release + 24 (init.c:994)
9   libdispatch.dylib             0x0000000185424a60 _dispatch_client_callout + 16 (object.m:507)
10  libdispatch.dylib             0x000000018542bb84 _dispatch_queue_override_invoke$VARIANT$mp + 716 (inline_internal.h:2500)
11  libdispatch.dylib             0x0000000185431cac _dispatch_root_queue_drain + 588 (inline_internal.h:2539)
12  libdispatch.dylib             0x00000001854319fc _dispatch_worker_thread3 + 120 (queue.c:6092)
13  libsystem_pthread.dylib       0x0000000185757fac _pthread_wqthread + 1176 (pthread.c:2297)
14  libsystem_pthread.dylib       0x0000000185757b08 start_wqthread + 4


Thread 0 crashed with ARM Thread State (64-bit):
    x0: 0x0000000010004005   x1: 0x0000000007000806   x2: 0x0000000000000000   x3: 0x0000000000000c00
    x4: 0x0000000000001a03   x5: 0x00000000ffffffff   x6: 0x0000000000000000   x7: 0x0000000000000000
    x8: 0x00000000fffffbbf   x9: 0x0000000007000000  x10: 0x0000000007000000  x11: 0x0000000000000040
   x12: 0xffffffffffffffff  x13: 0x0000000000000001  x14: 0x0000000000000000  x15: 0x0051dc000051dc00
   x16: 0xffffffffffffffe1  x17: 0x000000000051dc00  x18: 0x0000000000000000  x19: 0x0000000000000000
   x20: 0x00000000ffffffff  x21: 0x0000000000001a03  x22: 0x0000000000000c00  x23: 0x000000016d67ec48
   x24: 0x0000000007000806  x25: 0x0000000000000000  x26: 0x0000000007000806  x27: 0x0000000000000c00
   x28: 0x0000000000000001   fp: 0x000000016d67eb30   lr: 0x0000000185597c80
    sp: 0x000000016d67eae0   pc: 0x0000000185597e08 cpsr: 0x60000000


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0x190b02000 - 0x190d09fff Intents arm64   /System/Library/Frameworks/Intents.framework/Intents
0x190d0a000 - 0x190d24fff libresolv.9.dylib arm64   /usr/lib/libresolv.9.dylib
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0x190f2f000 - 0x190f5dfff vCard arm64  <9537fc85395634e3ae5e60cf8d91646d> /System/Library/PrivateFrameworks/vCard.framework/vCard
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0x19106c000 - 0x19106dfff DiagnosticLogCollection arm64   /System/Library/PrivateFrameworks/DiagnosticLogCollection.framework/DiagnosticLogCollection
0x19106e000 - 0x19106ffff Marco arm64   /System/Library/PrivateFrameworks/Marco.framework/Marco
0x191070000 - 0x19107afff MessageProtection arm64  <0483cffe36733381a42c53d35d89b44e> /System/Library/PrivateFrameworks/MessageProtection.framework/MessageProtection
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0x197f96000 - 0x197fc7fff SharedUtils arm64  <7abd3461880838ad9b54fd92ddf03e39> /System/Library/Frameworks/LocalAuthentication.framework/Support/SharedUtils.framework/SharedUtils
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0x198399000 - 0x1983affff LocalAuthentication arm64   /System/Library/Frameworks/LocalAuthentication.framework/LocalAuthentication
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0x19845b000 - 0x198473fff CoreInterest arm64  <830a73d02a6e38f9b56714d2d58cd082> /System/Library/PrivateFrameworks/CoreInterest.framework/CoreInterest
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0x1acd36000 - 0x1acd41fff libMobileGestaltExtensions.dylib arm64  <918430beb6b8325a9366842e95bc4d39> /usr/lib/libMobileGestaltExtensions.dylib
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EOF

Replies

So I'm wondering if these two crashes are related (or the same) and just being reported differently by the different tools, and what (of course) we can do to prevent the crashing.

It’s hard to say what’s going on here without seeing a clean crash report, and it seems likely that your third-party crash reporter is preventing that from being generated. My recommendation is, as always, that you remove the third-party crash reporter and see what comes through the Apple crash reporting infrastructure.

Share and Enjoy

Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Here's an example of the first crash the OP mentioned.


For me, 100% of the time, it is happening shortly after the upload process begins after modifying a ubiquitous document locally. Frequently, none of my code is listed in any other thread's stack trace. Seeing this on iOS 11+ (iOS 12 beta included) across all device models . I've never been able to reproduce it, but users that encounter it do so frequently.


Here's an example of it pulled from a .crashpoint document:

Incident Identifier: 3782B22F-4935-40FA-9D42-6FAB93C0256C
Beta Identifier:     51B8B54E-1273-4830-B588-8EEBEE6B62F0
Hardware Model:      iPhone9,3
Process:             Redacted [2100]
Path:                Redacted
Identifier:          Redacted
Version:             Redacted
Beta:                YES
Code Type:           ARM-64 (Native)
Role:                Foreground
Parent Process:      launchd [1]
Coalition:           Redacted [885]




Date/Time:           2018-06-15 02:38:29.9438 +0100
Launch Time:         2018-06-15 00:52:47.3297 +0100
OS Version:          iPhone OS 11.4 (15F79)
Baseband Version:    2.03.12
Report Version:      104


Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x000000025113bec8
VM Region Info: 0x25113bec8 is not in any region.  Bytes after previous region: 1897119433  
      REGION TYPE                      START - END             [ VSIZE] PRT/MAX SHRMOD  REGION DETAIL
      MALLOC_NANO (reserved) 00000001d8000000-00000001e0000000 [128.0M] rw-/rwx SM=NUL  ...(unallocated)
--->  
      UNUSED SPACE AT END


Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [0]
Triggered by Thread:  9


Thread 0 name:
Thread 0:
0   libsystem_kernel.dylib         0x0000000184a67e08 mach_msg_trap + 8
1   libsystem_kernel.dylib         0x0000000184a67c80 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                 0x0000000184faae40 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613)
3   CoreFoundation                 0x0000000184fa8908 __CFRunLoopRun + 1568 (CFRunLoop.c:2969)
4   CoreFoundation                 0x0000000184ec8da8 CFRunLoopRunSpecific + 552 (CFRunLoop.c:3245)
5   GraphicsServices               0x0000000186ead020 GSEventRunModal + 100 (GSEvent.c:2245)
6   UIKit                         0x000000018eee5758 UIApplicationMain + 236 (UIApplication.m:3965)
7   Redacted                       0x00000001006aacf8 main + 304 (main.m:19)
8   libdyld.dylib                 0x0000000184959fc0 start + 4


Thread 1 name:
Thread 1:
0   libsystem_kernel.dylib         0x0000000184a89538 __select + 8
1   CoreFoundation                 0x0000000184fb3378 __CFSocketManager + 644 (CFSocket.c:2241)
2   libsystem_pthread.dylib       0x0000000184c29220 _pthread_body + 272 (pthread.c:740)
3   libsystem_pthread.dylib       0x0000000184c29110 _pthread_start + 292 (pthread.c:799)
4   libsystem_pthread.dylib       0x0000000184c27b10 thread_start + 4


Thread 2 name:
Thread 2:
0   libsystem_kernel.dylib         0x0000000184a67e08 mach_msg_trap + 8
1   libsystem_kernel.dylib         0x0000000184a67c80 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                 0x0000000184faae40 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613)
3   CoreFoundation                 0x0000000184fa8908 __CFRunLoopRun + 1568 (CFRunLoop.c:2969)
4   CoreFoundation                 0x0000000184ec8da8 CFRunLoopRunSpecific + 552 (CFRunLoop.c:3245)
5   Foundation                     0x000000018593d674 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 304 (NSRunLoop.m:367)
6   Foundation                     0x000000018593d51c -[NSRunLoop(NSRunLoop) runUntilDate:] + 148 (NSRunLoop.m:411)
7   UIKit                         0x000000018ebca768 -[UIEventFetcher threadMain] + 136 (UIEventFetcher.m:437)
8   Foundation                     0x0000000185a4defc __NSThread__start__ + 1040 (NSThread.m:1181)
9   libsystem_pthread.dylib       0x0000000184c29220 _pthread_body + 272 (pthread.c:740)
10  libsystem_pthread.dylib       0x0000000184c29110 _pthread_start + 292 (pthread.c:799)
11  libsystem_pthread.dylib       0x0000000184c27b10 thread_start + 4


Thread 3 name:
Thread 3:
0   libsystem_kernel.dylib         0x0000000184a67e08 mach_msg_trap + 8
1   libsystem_kernel.dylib         0x0000000184a67c80 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                 0x0000000184faae40 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613)
3   CoreFoundation                 0x0000000184fa8908 __CFRunLoopRun + 1568 (CFRunLoop.c:2969)
4   CoreFoundation                 0x0000000184ec8da8 CFRunLoopRunSpecific + 552 (CFRunLoop.c:3245)
5   AVFAudio                       0x000000018a9c2398 GenericRunLoopThread::Entry(void*) + 164 (GenericRunLoopThread.h:92)
6   AVFAudio                       0x000000018a9ec7a8 CAPThread::Entry(CAPThread*) + 88
7   libsystem_pthread.dylib       0x0000000184c29220 _pthread_body + 272 (pthread.c:740)
8   libsystem_pthread.dylib       0x0000000184c29110 _pthread_start + 292 (pthread.c:799)
9   libsystem_pthread.dylib       0x0000000184c27b10 thread_start + 4


Thread 4:
0   libsystem_kernel.dylib         0x0000000184a890f4 __psynch_cvwait + 8
1   libsystem_pthread.dylib       0x0000000184c2bc90 _pthread_cond_wait$VARIANT$mp + 644 (pthread_cond.c:579)
2   libc++.1.dylib                 0x000000018414025c std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 24 (__threading_support:278)
3   JavaScriptCore                 0x000000018c64f460 void std::__1::condition_variable_any::wait<std::__1::unique_lock<bmalloc::Mutex> >(std::__1::unique_lock<bmalloc::Mutex>&) + 104 (condition_variable:204)
4   JavaScriptCore                 0x000000018c64f074 bmalloc::Scavenger::threadRunLoop() + 164 (condition_variable:213)
5   JavaScriptCore                 0x000000018c64ee1c bmalloc::Scavenger::threadEntryPoint(bmalloc::Scavenger*) + 12 (Scavenger.cpp:143)
6   JavaScriptCore                 0x000000018c64f238 void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(bmalloc::Scavenger*), bmalloc::Scavenger*> >(void*) + 44 (type_traits:4323)
7   libsystem_pthread.dylib       0x0000000184c29220 _pthread_body + 272 (pthread.c:740)
8   libsystem_pthread.dylib       0x0000000184c29110 _pthread_start + 292 (pthread.c:799)
9   libsystem_pthread.dylib       0x0000000184c27b10 thread_start + 4


Thread 5 name:
Thread 5:
0   libsystem_kernel.dylib         0x0000000184a67e08 mach_msg_trap + 8
1   libsystem_kernel.dylib         0x0000000184a67c80 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                 0x0000000184faae40 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613)
3   CoreFoundation                 0x0000000184fa8908 __CFRunLoopRun + 1568 (CFRunLoop.c:2969)
4   CoreFoundation                 0x0000000184ec8da8 CFRunLoopRunSpecific + 552 (CFRunLoop.c:3245)
5   WebCore                       0x000000018d18a2d0 RunWebThread(void*) + 592 (WebCoreThread.mm:624)
6   libsystem_pthread.dylib       0x0000000184c29220 _pthread_body + 272 (pthread.c:740)
7   libsystem_pthread.dylib       0x0000000184c29110 _pthread_start + 292 (pthread.c:799)
8   libsystem_pthread.dylib       0x0000000184c27b10 thread_start + 4


Thread 6 name:
Thread 6:
0   libsystem_kernel.dylib         0x0000000184a67e08 mach_msg_trap + 8
1   libsystem_kernel.dylib         0x0000000184a67c80 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                 0x0000000184faae40 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613)
3   CoreFoundation                 0x0000000184fa8908 __CFRunLoopRun + 1568 (CFRunLoop.c:2969)
4   CoreFoundation                 0x0000000184ec8da8 CFRunLoopRunSpecific + 552 (CFRunLoop.c:3245)
5   CoreFoundation                 0x0000000184f18b28 CFRunLoopRun + 116 (CFRunLoop.c:3269)
6   CoreMotion                     0x000000018a4bd9dc CLMotionCore::runMotionThread(void*) + 1120 (CLMotionCore.mm:316)
7   libsystem_pthread.dylib       0x0000000184c29220 _pthread_body + 272 (pthread.c:740)
8   libsystem_pthread.dylib       0x0000000184c29110 _pthread_start + 292 (pthread.c:799)
9   libsystem_pthread.dylib       0x0000000184c27b10 thread_start + 4


Thread 7:
0   libsystem_kernel.dylib         0x0000000184a89d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x0000000184c27eb4 _pthread_wqthread + 928 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000184c27b08 start_wqthread + 4


Thread 8:
0   libsystem_kernel.dylib         0x0000000184a89d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x0000000184c280a0 _pthread_wqthread + 1420 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000184c27b08 start_wqthread + 4


Thread 9 name:
Thread 9 Crashed:
0   libobjc.A.dylib               0x00000001841d81a0 objc_retain + 16 (objc-object.h:440)
1   libsystem_blocks.dylib         0x0000000184994cc8 _Block_object_assign + 204 (runtime.c:431)
2   libsystem_blocks.dylib         0x0000000184994964 _Block_copy + 140 (runtime.c:167)
3   CoreFoundation                 0x0000000184ecd474 CFRunLoopPerformBlock + 660 (CFRunLoop.c:3413)
4   Foundation                     0x0000000185b84470 -[_NSProgressProxy _setRemoteValues:forKeys:] + 108 (NSProgressSubscriber.m:110)
5   Foundation                     0x0000000185b85c2c -[_NSProgressSubscriber observePublisherForID:values:forKeys:] + 376 (NSProgressSubscriber.m:442)
6   Foundation                     0x0000000185b6a984 __NSXPCCONNECTION_IS_CALLING_OUT_TO_EXPORTED_OBJECT_S3__ + 24 (NSXPCConnection.m:152)
7   Foundation                     0x00000001859696f4 -[NSXPCConnection _decodeAndInvokeMessageWithEvent:flags:] + 2456 (NSXPCConnection.m:631)
8   Foundation                     0x000000018598bac0 message_handler + 240 (NSXPCConnection.m:706)
9   libxpc.dylib                   0x0000000184c63004 _xpc_connection_call_event_handler + 68 (connection.c:0)
10  libxpc.dylib                   0x0000000184c60998 _xpc_connection_mach_event + 984 (connection.c:1203)
11  libdispatch.dylib             0x00000001848f4b30 _dispatch_client_callout4 + 16 (object.m:547)
12  libdispatch.dylib             0x000000018490b440 _dispatch_mach_msg_invoke$VARIANT$mp + 352 (mach.c:2169)
13  libdispatch.dylib             0x00000001848fe86c _dispatch_queue_serial_drain$VARIANT$mp + 280 (inline_internal.h:2539)
14  libdispatch.dylib             0x000000018490beec _dispatch_mach_invoke$VARIANT$mp + 508 (mach.c:2467)
15  libdispatch.dylib             0x00000001848fe86c _dispatch_queue_serial_drain$VARIANT$mp + 280 (inline_internal.h:2539)
16  libdispatch.dylib             0x00000001848ff2fc _dispatch_queue_invoke$VARIANT$mp + 336 (queue.c:5290)
17  libdispatch.dylib             0x00000001848ffcc8 _dispatch_root_queue_drain_deferred_wlh$VARIANT$mp + 340 (queue.c:5908)
18  libdispatch.dylib             0x0000000184908098 _dispatch_workloop_worker_thread$VARIANT$mp + 668 (source.c:2529)
19  libsystem_pthread.dylib       0x0000000184c27e70 _pthread_wqthread + 860 (pthread.c:2218)
20  libsystem_pthread.dylib       0x0000000184c27b08 start_wqthread + 4


Thread 10:
0   libsystem_kernel.dylib         0x0000000184a67e5c semaphore_timedwait_trap + 8
1   libdispatch.dylib             0x00000001848f702c _dispatch_sema4_timedwait$VARIANT$mp + 60 (lock.c:149)
2   libdispatch.dylib             0x00000001848f78a0 _dispatch_semaphore_wait_slow + 72 (semaphore.c:127)
3   libdispatch.dylib             0x00000001849031b8 _dispatch_worker_thread + 256 (queue.c:6167)
4   libsystem_pthread.dylib       0x0000000184c29220 _pthread_body + 272 (pthread.c:740)
5   libsystem_pthread.dylib       0x0000000184c29110 _pthread_start + 292 (pthread.c:799)
6   libsystem_pthread.dylib       0x0000000184c27b10 thread_start + 4


Thread 11:
0   libsystem_kernel.dylib         0x0000000184a67e5c semaphore_timedwait_trap + 8
1   libdispatch.dylib             0x00000001848f702c _dispatch_sema4_timedwait$VARIANT$mp + 60 (lock.c:149)
2   libdispatch.dylib             0x00000001848f78a0 _dispatch_semaphore_wait_slow + 72 (semaphore.c:127)
3   libdispatch.dylib             0x00000001849031b8 _dispatch_worker_thread + 256 (queue.c:6167)
4   libsystem_pthread.dylib       0x0000000184c29220 _pthread_body + 272 (pthread.c:740)
5   libsystem_pthread.dylib       0x0000000184c29110 _pthread_start + 292 (pthread.c:799)
6   libsystem_pthread.dylib       0x0000000184c27b10 thread_start + 4


Thread 12:
0   libsystem_pthread.dylib       0x0000000184c27b04 start_wqthread + 0 (pthread.c:2458)


Thread 13:
0   libsystem_kernel.dylib         0x0000000184a89d84 __workq_kernreturn + 8
1   libsystem_pthread.dylib       0x0000000184c27eb4 _pthread_wqthread + 928 (pthread.c:0)
2   libsystem_pthread.dylib       0x0000000184c27b08 start_wqthread + 4


Thread 14:
0   libsystem_pthread.dylib       0x0000000184c27b04 start_wqthread + 0 (pthread.c:2458)


Thread 9 crashed with ARM Thread State (64-bit):
    x0: 0x00000001c4365f40   x1: 0x00000001c4365f40   x2: 0x0000000000000003   x3: 0x00000001c2c7d778
    x4: 0x000000016fd25e80   x5: 0x0000000000000035   x6: 0x00000001c4365f40   x7: 0x0000000000000000
    x8: 0x000000025113bea8   x9: 0x0000000000000000  x10: 0x0000291c8fbe0000  x11: 0x0000000000000040
   x12: 0xffffffffffffffff  x13: 0x0000000000000001  x14: 0x0000000000000000  x15: 0x0a572f000a572f00
   x16: 0x0000000184c1e9d0  x17: 0x000000000a572f00  x18: 0x0000000000000000  x19: 0x00000001c2c7d770
   x20: 0x00000001c4365f40  x21: 0x0000000000000003  x22: 0x00000001c01f2310  x23: 0x00000001b5c3b964
   x24: 0x0000000000000001  x25: 0x0000000000000001  x26: 0x0000000000000000  x27: 0x0000000000000001
   x28: 0x0000000134c96400   fp: 0x000000016fd25ef0   lr: 0x0000000184994cc8
    sp: 0x000000016fd25ed0   pc: 0x00000001841d81a0 cpsr: 0x60000000

Here's an example of the first crash the OP mentioned.

Unfortunately that crash report is missing the Binary Images section, which is kinda critical. It’s also has chunks redacted. Can you post a full crash report?

Or, if you don’t want to post it publicly, feel free to email it to me (my address is in my signature). Make sure to reference this thread, just for context.

Share and Enjoy

Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

No problem, just emailed it.

Thanks @tundaware and @eskimo.


Removing third party crash reporting is not likely to happen for this application any time soon, so having your assistance with a "clean" crash is really helpful. Please share any findings you may have here as this is still a very frequent issue for our produciton application and we are at a loss as to how to address it.


Cheers,


Levi

Please share any findings you may have here as this is still a very frequent issue for our produciton application and we are at a loss as to how to address it.

A developer opened a DTS tech support incident about this and I took an in-depth look. My conclusions:

  • As far as I can tell this is a bug in

    NSProgress
    .
  • We now have a bug on file about it (r. 41374087).

  • We believe we understand the root cause and hope to fix it in a future system release. As always, I can’t offer any predictions as to when that will be.

  • As far as I can tell the problem has been present in

    NSProgress
    for years, and it’s only showing up on newer systems because various folks are using
    NSProgress
    more heavily, and especially from different threads.
  • I can’t think of any way to work around this in your code. All of this work is happening internally to higher-level objects (in the specific example I was looking at it was

    UIDocument
    ), meaning you don’t have any way to influence the lower-level code that’s failing.
  • If you have hard evidence that this problem is causing grief for a large number of users, please do put that in your own bug report and ask it to be dup’d to our lead bug. The Foundation team will then take that into account as they decide on the release vehicle for the fix.

Share and Enjoy

Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Thanks Quinn,


I will duplicate the Radar. I'm not sure exactly what "hard evidence" I can provide, but our third party crash reporter system (Fabric) is reporting nearly 2k crashes for our users over the past 90 days.


Cheers,


Levi

Duplicate filed as 41770947



Cheers,


Levi

What is the status of this bug report? We are getting crashes with progress as well, and as far back as I can tell (2015), people have been reporting this bug. http://openradar.appspot.com/19591158

What is the status of this bug report?

We have a proposed fix for this bug (r. 41374087) but it’s not in any shipping or seeded release.

Share and Enjoy

Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

I am also facing this crash. I have several reports on crashlytics dashboard. Issue started appearing in my app after integrating iCloud SaveGame feature.

Crashed: com.apple.NSXPCConnection.m-user.com.apple.ProgressReporting

0 libobjc.A.dylib 0x196af5430 objc_retain + 16

1 libsystem_blocks.dylib 0x1973a2ca8 _Block_object_assign + 204

2 libsystem_blocks.dylib 0x1973a294c _Block_copy + 140

3 CoreFoundation 0x1978996f8 CFRunLoopPerformBlock + 608

4 Foundation 0x198313600 -[_NSProgressProxy _setRemoteValues:forKeys:] + 108

5 Foundation 0x198311208 -[_NSProgressSubscriber observePublisherForID:values:forKeys:] + 376

6 Foundation 0x1984d1e1c __NSXPCCONNECTION_IS_CALLING_OUT_TO_EXPORTED_OBJECT_S3__ + 24

7 Foundation 0x1982dd4a8 -[NSXPCConnection _decodeAndInvokeMessageWithEvent:flags:] + 2416

8 Foundation 0x1984d1f44 message_handler + 240

9 libxpc.dylib 0x197561090 _xpc_connection_call_event_handler + 68

10 libxpc.dylib 0x1975613fc _xpc_connection_mach_event + 864

11 libdispatch.dylib 0x197346544 _dispatch_client_callout4 + 16

12 libdispatch.dylib 0x1972fd020 _dispatch_mach_msg_invoke$VARIANT$mp + 340

13 libdispatch.dylib 0x1972eda9c _dispatch_lane_serial_drain$VARIANT$mp + 284

14 libdispatch.dylib 0x1972fdc10 _dispatch_mach_invoke$VARIANT$mp + 476

15 libdispatch.dylib 0x1972eda9c _dispatch_lane_serial_drain$VARIANT$mp + 284

16 libdispatch.dylib 0x1972ee74c _dispatch_lane_invoke$VARIANT$mp + 484

17 libdispatch.dylib 0x1972f6eb8 _dispatch_workloop_worker_thread + 600

18 libsystem_pthread.dylib 0x1975290dc _pthread_wqthread + 312

19 libsystem_pthread.dylib 0x19752bcec start_wqthread + 4

I am also facing this crash.

)-:

I believe the fix for this is in the currently seeded iOS 12.2b3. Let us know if you see this crash on that system or later.

Share and Enjoy

Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

I'm not entirely sure if I'm experiencing the exact same issue. But I too get a very similar error looking at the stack trace by using KVO with the Progress class.

I seem to have found a workaround for this specific case by manually retaining and releasing the observed progress object:


private var unmanagedProgress: Unmanaged<Progress>?

// Manually retain the progress instance.
self.unmanagedProgress = Unmanaged.passRetained(progress)

self.observer = progress.observe(\.completedUnitCount, options: [.new]) { progress, change in
    // Stop the observation and release the progress once the work is done.
    if progress.completedUnitCount >= progress.totalUnitCount {
        self.observer = nil
        self.unmanagedProgress?.release()
    }
}


This somehow seems to prevent the over-releasing of the progress instance and thus doesn't cause the EXC_BAD_ACCESS crash.


The same code without the manual retain/release but with a simple progress property eventually causes a crash if you just run your tasks often enough.