[iOS] Race condition between the main thread and a thread used by CADisplayLinkTicker

[PradoVargasN]

Description

Race condition between the main thread and a thread used by CADisplayLinkTicker
CADisplayLinkTicker invokes Quartz.CATransaction.commi()t which is deciding to do an auto layout while not on the main thread, in the main thread we are adding/removing ContentViews (Note class in our code) to an AbsoluteLayout

This makes the iOS version of our app to crash.

Hardware Model:      iPhone10,4
Code Type:           ARM-64 (Native)
Role:                Foreground
Parent Process:      launchd [1]

Date/Time:           2018-01-15 09:22:43.8605 -0700
Launch Time:         2018-01-15 09:19:50.1545 -0700
OS Version:          iPhone OS 11.2.1 (15C153)
Baseband Version:    1.03.06
Report Version:      104

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Triggered by Thread:  18

Application Specific Information:
abort() called

Filtered syslog:
None found

Last Exception Backtrace:
0   CoreFoundation                	0x183eb2364 __exceptionPreprocess + 124
1   libobjc.A.dylib               	0x1830f8528 objc_exception_throw + 55
2   CoreFoundation                	0x183eb19f0 __NSFastEnumerationMutationHandler + 127
3   UIKit                         	0x18d38ac04 -[UIView+ 27652 (Hierarchy) subviews] + 343
4   UIKit                         	0x18d67e200 -[UIView+ 3121664 (CALayerDelegate) _wantsReapplicationOfAutoLayoutWithLayoutDirtyOnEntry:] + 71
5   UIKit                         	0x18d390f48 -[UIView+ 53064 (CALayerDelegate) layoutSublayersOfLayer:] + 1347
6   QuartzCore                    	0x187ef5998 -[CALayer layoutSublayers] + 183
7   QuartzCore                    	0x187ef9b20 CA::Layer::layout_if_needed+ 1207072 (CA::Transaction*) + 331
8   QuartzCore                    	0x187e6636c CA::Context::commit_transaction+ 602988 (CA::Transaction*) + 335
9   QuartzCore                    	0x187e8db90 CA::Transaction::commit+ 764816 () + 539
10  MyAPP                      	0x1046bbcd8 wrapper_managed_to_native_ObjCRuntime_Messaging_void_objc_msgSend_intptr_intptr + 25263320 (/<unknown>:1)
11  MyAPP                      	0x104663ca8 CoreAnimation_CATransaction_Commit + 24902824 (CATransaction.g.cs:89)
12  MyAPP                      	0x10453db7c Xamarin_Forms_Platform_iOS_CADisplayLinkTicker_StartThread + 23698300 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.iOS\CADisplayLinkTicker.cs:61)
13  MyAPP                      	0x103a3b33c System_Threading_ThreadHelper_ThreadStart_Context_object + 187
14  MyAPP                      	0x103a38ef4 System_Threading_ExecutionContext_RunInternal_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 403
15  MyAPP                      	0x103a38d4c System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 43
16  MyAPP                      	0x103a38ccc System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object + 75
17  MyAPP                      	0x103a3b4a4 System_Threading_ThreadHelper_ThreadStart + 51
18  MyAPP                      	0x103b981b4 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 243
19  MyAPP                      	0x1055a4b84 mono_jit_runtime_invoke + 40897412 (mini-runtime.c:2525)
20  MyAPP                      	0x10561e238 do_runtime_invoke + 41394744 (object.c:2829)
21  MyAPP                      	0x10564b934 start_wrapper + 41580852 (threads.c:837)
22  libsystem_pthread.dylib       	0x183ad82b4 _pthread_body + 307
23  libsystem_pthread.dylib       	0x183ad8180 _pthread_start + 311
24  libsystem_pthread.dylib       	0x183ad6b74 thread_start + 3


Thread 0 name:  tid_303  Dispatch queue: com.apple.main-thread
Thread 0:
0   MyAPP                      	0x0000000105628de4 mono_type_get_object_handle + 41438692 (reflection.c:564)
1   MyAPP                      	0x00000001055e1130 ves_icall_System_Type_internal_from_name + 41144624 (handle.h:413)
2   MyAPP                      	0x00000001039582c8 wrapper_managed_to_native_System_Type_internal_from_name_string_bool_bool + 168
3   MyAPP                      	0x0000000103958354 System_Type_GetType_string + 36
4   MyAPP                      	0x0000000104e5e9cc Xamarin_Forms_Xaml_TypeConversionExtensions__c__DisplayClass1_0__ConvertTob__0 + 33270220 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Xaml\TypeConversionExtensions.cs:70)
5   MyAPP                      	0x0000000104e5c658 Xamarin_Forms_Xaml_TypeConversionExtensions_ConvertTo_object_System_Type_System_Func_1_object_System_IServiceProvider + 33261144 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Xaml\TypeConversionExtensions.cs:110)
6   MyAPP                      	0x0000000104e5bbdc Xamarin_Forms_Xaml_TypeConversionExtensions_ConvertTo_object_System_Type_System_Func_1_System_Reflection_MemberInfo_System_IServiceProvider + 33258460 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Xaml\TypeConversionExtensions.cs:74)
7   MyAPP                      	0x0000000104e71e88 Xamarin_Forms_Xaml_ApplyPropertiesVisitor_TrySetValue_object_Xamarin_Forms_BindableProperty_bool_object_System_Xml_IXmlLineInfo_Xamarin_Forms_Xaml_Internals_XamlServiceProvider_System_Exception_ + 33349256 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Xaml\ApplyPropertiesVisitor.cs:404)
8   MyAPP                      	0x0000000104e706f0 Xamarin_Forms_Xaml_ApplyPropertiesVisitor_SetPropertyValue_object_Xamarin_Forms_Xaml_XmlName_object_object_Xamarin_Forms_Xaml_INode_Xamarin_Forms_Xaml_HydratationContext_System_Xml_IXmlLineInfo + 33343216 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Xaml\ApplyPropertiesVisitor.cs:295)
9   MyAPP                      	0x0000000104e6bf78 Xamarin_Forms_Xaml_ApplyPropertiesVisitor_Visit_Xamarin_Forms_Xaml_ValueNode_Xamarin_Forms_Xaml_INode + 33324920 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Xaml\ApplyPropertiesVisitor.cs:64)
10  MyAPP                      	0x0000000104e5689c Xamarin_Forms_Xaml_ValueNode_Accept_Xamarin_Forms_Xaml_IXamlNodeVisitor_Xamarin_Forms_Xaml_INode + 33237148 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Xaml\XamlNode.cs:102)
11  MyAPP                      	0x0000000104e57858 Xamarin_Forms_Xaml_ElementNode_Accept_Xamarin_Forms_Xaml_IXamlNodeVisitor_Xamarin_Forms_Xaml_INode + 33241176 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Xaml\XamlNode.cs:169)
12  MyAPP                      	0x0000000104e596c4 Xamarin_Forms_Xaml_ListNode_Accept_Xamarin_Forms_Xaml_IXamlNodeVisitor_Xamarin_Forms_Xaml_INode + 33248964 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Xaml\XamlNode.cs:248)
13  MyAPP                      	0x0000000104e57858 Xamarin_Forms_Xaml_ElementNode_Accept_Xamarin_Forms_Xaml_IXamlNodeVisitor_Xamarin_Forms_Xaml_INode + 33241176 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Xaml\XamlNode.cs:169)
14  MyAPP                      	0x0000000104e58d28 Xamarin_Forms_Xaml_RootNode_Accept_Xamarin_Forms_Xaml_IXamlNodeVisitor_Xamarin_Forms_Xaml_INode + 33246504 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Xaml\XamlNode.cs:222)
15  MyAPP                      	0x0000000104e54408 Xamarin_Forms_Xaml_XamlLoader_Visit_Xamarin_Forms_Xaml_RootNode_Xamarin_Forms_Xaml_HydratationContext + 33227784 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Xaml\XamlLoader.cs:136)
16  MyAPP                      	0x0000000104e53748 Xamarin_Forms_Xaml_XamlLoader_Load_object_string + 33224520 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Xaml\XamlLoader.cs:90)
17  MyAPP                      	0x0000000104e53308 Xamarin_Forms_Xaml_XamlLoader_Load_object_System_Type + 33223432 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Xaml\XamlLoader.cs:67)
18  MyAPP                      	0x0000000104e53020 Xamarin_Forms_Xaml_Extensions_LoadFromXaml_TXaml_REF_TXaml_REF_System_Type + 33222688 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Xaml\ViewExtensions.cs:37)
19  MyAPP                      	0x0000000104873a04 MyAPP_PCL_Controls_Note_InitializeComponent + 27064836 (MyAPP.PCL.Controls.Note.xaml.g.cs:20)
20  MyAPP                      	0x0000000104873940 MyAPP_PCL_Controls_Note__ctor + 27064640 (Note.xaml.cs:10)
21  MyAPP                      	0x0000000104874184 MyAPP_PCL_Controls_NotesRenderer_Add_MyAPP_PCL_Controls_NotesRenderer_NoteViewModel + 27066756 (NotesRenderer.xaml.cs:38)
22  MyAPP                      	0x0000000104873cd8 MyAPP_PCL_Controls_NotesRenderer_AddOrUpdate_System_Collections_Generic_IEnumerable_1_MyAPP_PCL_Controls_NotesRenderer_NoteViewModel + 27065560 (NotesRenderer.xaml.cs:23)
23  MyAPP                      	0x0000000103298160 MyAPP_Layouts_RigDetails_RigChartsTab__c__DisplayClass161_1__UpdateTimeHistoryb__5 + 4145504 (RigChartsTab.xaml.cs:3253)
24  MyAPP                      	0x0000000104621444 Foundation_NSAsyncActionDispatcher_Apply + 24630340 (NSAction.cs:163)
25  MyAPP                      	0x0000000103b981b4 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 244
26  MyAPP                      	0x00000001055a4b84 mono_jit_runtime_invoke + 40897412 (mini-runtime.c:2526)
27  MyAPP                      	0x000000010561e238 do_runtime_invoke + 41394744 (object.c:2829)
28  MyAPP                      	0x000000010561e198 mono_runtime_invoke + 41394584 (object.c:2983)
29  MyAPP                      	0x0000000102ec315c native_to_managed_trampoline_3(objc_object*, objc_selector*, _MonoMethod**, unsigned int) + 127324 (registrar.m:108)
30  MyAPP                      	0x0000000102ec36b4 -[__MonoMac_NSAsyncActionDispatcher xamarinApplySelector] + 128692 (registrar.m:8202)
31  Foundation                    	0x00000001848af2e4 __NSThreadPerformPerform + 340
32  CoreFoundation                	0x0000000183e5a97c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
33  CoreFoundation                	0x0000000183e5a8fc __CFRunLoopDoSource0 + 88
34  CoreFoundation                	0x0000000183e5a184 __CFRunLoopDoSources0 + 204
35  CoreFoundation                	0x0000000183e57d5c __CFRunLoopRun + 1048
36  CoreFoundation                	0x0000000183d77e58 CFRunLoopRunSpecific + 436
37  GraphicsServices              	0x0000000185c24f84 GSEventRunModal + 100
38  UIKit                         	0x000000018d3f767c UIApplicationMain + 236
39  MyAPP                      	0x00000001046b9380 wrapper_managed_to_native_UIKit_UIApplication_UIApplicationMain_int_string___intptr_intptr + 25252736 (/<unknown>:1)
40  MyAPP                      	0x000000010463efdc UIKit_UIApplication_Main_string___intptr_intptr + 24752092 (UIApplication.cs:79)
41  MyAPP                      	0x000000010463ef9c UIKit_UIApplication_Main_string___string_string + 24752028 (UIApplication.cs:63)
42  MyAPP                      	0x00000001034c8120 MyAPP_iOS_Application_Main_string__ + 6439200 (Main.cs:19)
43  MyAPP                      	0x0000000103b981b4 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 244
44  MyAPP                      	0x00000001055a4b84 mono_jit_runtime_invoke + 40897412 (mini-runtime.c:2526)
45  MyAPP                      	0x000000010561e238 do_runtime_invoke + 41394744 (object.c:2829)
46  MyAPP                      	0x0000000105621398 do_exec_main_checked + 41407384 (object.c:4623)
47  MyAPP                      	0x0000000105588de8 mono_jit_exec + 40783336 (driver.g.c:1040)
48  MyAPP                      	0x00000001056f9dac xamarin_main + 42294700 (monotouch-main.m:483)
49  MyAPP                      	0x0000000102eef1b0 main + 307632 (main.m:161)
50  libdyld.dylib                 	0x000000018389456c start + 4

Thread 1:
0   libsystem_kernel.dylib        	0x00000001839c4d80 __workq_kernreturn + 8
1   libsystem_pthread.dylib       	0x0000000183ad6eec _pthread_wqthread + 884
2   libsystem_pthread.dylib       	0x0000000183ad6b6c start_wqthread + 4

Thread 2:
0   libsystem_kernel.dylib        	0x00000001839c40f0 __psynch_cvwait + 8
1   libsystem_pthread.dylib       	0x0000000183adef74 _pthread_cond_wait$VARIANT$armv81 + 624
2   libc++.1.dylib                	0x000000018307bea4 std::__1::condition_variable::wait+ 32420 (std::__1::unique_lock<std::__1::mutex>&) + 24
3   JavaScriptCore                	0x000000018b1b8b58 void std::__1::condition_variable_any::wait<std::__1::unique_lock<bmalloc::Mutex> >+ 9726808 (std::__1::unique_lock<bmalloc::Mutex>&) + 96
4   JavaScriptCore                	0x000000018b1b8a80 bmalloc::AsyncTask<bmalloc::Heap, void (bmalloc::Heap::*)()>::threadRunLoop+ 9726592 () + 172
5   JavaScriptCore                	0x000000018b1b8de4 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::AsyncTask<bmalloc::Heap, void (bmalloc::Heap::*)()>*), bmalloc::AsyncTask<bmalloc::Heap, void (bmalloc::Heap::*)()>*> >+ 9727460 (void*) + 44
6   libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
7   libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
8   libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 3 name:  WebThread
Thread 3:
0   libsystem_kernel.dylib        	0x00000001839a3568 mach_msg_trap + 8
1   libsystem_kernel.dylib        	0x00000001839a33e0 mach_msg + 72
2   CoreFoundation                	0x0000000183e5a308 __CFRunLoopServiceMachPort + 196
3   CoreFoundation                	0x0000000183e57ed4 __CFRunLoopRun + 1424
4   CoreFoundation                	0x0000000183d77e58 CFRunLoopRunSpecific + 436
5   WebCore                       	0x000000018bc852c8 RunWebThread+ 266952 (void*) + 560
6   libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
7   libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
8   libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 4 name:  SGen worker
Thread 4:
0   libsystem_kernel.dylib        	0x00000001839c40f0 __psynch_cvwait + 8
1   libsystem_pthread.dylib       	0x0000000183adef74 _pthread_cond_wait$VARIANT$armv81 + 624
2   MyAPP                      	0x000000010569f058 thread_func + 41922648 (sgen-thread-pool.c:130)
3   libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
4   libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
5   libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 5 name:  Finalizer
Thread 5:
0   libsystem_kernel.dylib        	0x00000001839a35a4 semaphore_wait_trap + 8
1   MyAPP                      	0x00000001055dda3c finalizer_thread + 41130556 (mono-os-semaphore.h:92)
2   MyAPP                      	0x000000010564b910 start_wrapper + 41580816 (threads.c:829)
3   libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
4   libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
5   libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 6:
0   libsystem_kernel.dylib        	0x00000001839c4d80 __workq_kernreturn + 8
1   libsystem_pthread.dylib       	0x0000000183ad6eec _pthread_wqthread + 884
2   libsystem_pthread.dylib       	0x0000000183ad6b6c start_wqthread + 4

Thread 7 name:  com.apple.uikit.eventfetch-thread
Thread 7:
0   libsystem_kernel.dylib        	0x00000001839a3568 mach_msg_trap + 8
1   libsystem_kernel.dylib        	0x00000001839a33e0 mach_msg + 72
2   CoreFoundation                	0x0000000183e5a308 __CFRunLoopServiceMachPort + 196
3   CoreFoundation                	0x0000000183e57ed4 __CFRunLoopRun + 1424
4   CoreFoundation                	0x0000000183d77e58 CFRunLoopRunSpecific + 436
5   Foundation                    	0x00000001847ad594 -[NSRunLoop+ 50580 (NSRunLoop) runMode:beforeDate:] + 304
6   Foundation                    	0x00000001847cc9ac -[NSRunLoop+ 178604 (NSRunLoop) runUntilDate:] + 96
7   UIKit                         	0x000000018df617b8 -[UIEventFetcher threadMain] + 136
8   Foundation                    	0x00000001848af0f4 __NSThread__start__ + 996
9   libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
10  libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
11  libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 8:
0   libsystem_pthread.dylib       	0x0000000183ad6b68 start_wqthread + 0

Thread 9 name:  Timer-Scheduler
Thread 9:
0   libsystem_kernel.dylib        	0x00000001839c40f0 __psynch_cvwait + 8
1   libsystem_pthread.dylib       	0x0000000183adef74 _pthread_cond_wait$VARIANT$armv81 + 624
2   MyAPP                      	0x0000000105658450 mono_os_cond_timedwait + 41632848 (mono-os-mutex.h:216)
3   MyAPP                      	0x000000010565712c mono_w32handle_timedwait_signal_handle + 41627948 (w32handle.c:976)
4   MyAPP                      	0x0000000105656fdc mono_w32handle_wait_one + 41627612 (w32handle.c:1213)
5   MyAPP                      	0x00000001056572ac mono_w32handle_wait_multiple + 41628332 (w32handle.c:1244)
6   MyAPP                      	0x000000010564707c mono_wait_uninterrupted + 41562236 (threads.c:1892)
7   MyAPP                      	0x000000010564738c ves_icall_System_Threading_WaitHandle_WaitOne_internal + 41563020 (threads.c:2017)
8   MyAPP                      	0x0000000103a467d8 wrapper_managed_to_native_System_Threading_WaitHandle_WaitOne_internal_intptr_int + 104
9   MyAPP                      	0x0000000103a46720 System_Threading_WaitHandle_WaitOneNative_System_Runtime_InteropServices_SafeHandle_uint_bool_bool + 80
10  MyAPP                      	0x0000000103a45eec System_Threading_WaitHandle_InternalWaitOne_System_Runtime_InteropServices_SafeHandle_long_bool_bool + 60
11  MyAPP                      	0x0000000103a45e9c System_Threading_WaitHandle_WaitOne_long_bool + 44
12  MyAPP                      	0x0000000103a45dac System_Threading_WaitHandle_WaitOne_int_bool + 60
13  MyAPP                      	0x0000000103a45e5c System_Threading_WaitHandle_WaitOne_int + 44
14  MyAPP                      	0x0000000103a4a308 System_Threading_Timer_Scheduler_SchedulerThread + 1400
15  MyAPP                      	0x0000000103a3b33c System_Threading_ThreadHelper_ThreadStart_Context_object + 188
16  MyAPP                      	0x0000000103a38ef4 System_Threading_ExecutionContext_RunInternal_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 404
17  MyAPP                      	0x0000000103a38d4c System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 44
18  MyAPP                      	0x0000000103a38ccc System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object + 76
19  MyAPP                      	0x0000000103a3b4a4 System_Threading_ThreadHelper_ThreadStart + 52
20  MyAPP                      	0x0000000103b981b4 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 244
21  MyAPP                      	0x00000001055a4b84 mono_jit_runtime_invoke + 40897412 (mini-runtime.c:2526)
22  MyAPP                      	0x000000010561e238 do_runtime_invoke + 41394744 (object.c:2829)
23  MyAPP                      	0x000000010564b934 start_wrapper + 41580852 (threads.c:839)
24  libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
25  libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
26  libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 10 name:  Threadpool worker
Thread 10:
0   libsystem_kernel.dylib        	0x00000001839c40f0 __psynch_cvwait + 8
1   libsystem_pthread.dylib       	0x0000000183adef74 _pthread_cond_wait$VARIANT$armv81 + 624
2   MyAPP                      	0x00000001056418b4 worker_thread + 41539764 (mono-os-mutex.h:216)
3   MyAPP                      	0x000000010564b910 start_wrapper + 41580816 (threads.c:829)
4   libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
5   libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
6   libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 11 name:  Threadpool worker
Thread 11:
0   libsystem_kernel.dylib        	0x00000001839c40f0 __psynch_cvwait + 8
1   libsystem_pthread.dylib       	0x0000000183adef74 _pthread_cond_wait$VARIANT$armv81 + 624
2   MyAPP                      	0x00000001056418b4 worker_thread + 41539764 (mono-os-mutex.h:216)
3   MyAPP                      	0x000000010564b910 start_wrapper + 41580816 (threads.c:829)
4   libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
5   libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
6   libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 12 name:  Threadpool worker
Thread 12:
0   libsystem_kernel.dylib        	0x00000001839c40f0 __psynch_cvwait + 8
1   libsystem_pthread.dylib       	0x0000000183adef74 _pthread_cond_wait$VARIANT$armv81 + 624
2   MyAPP                      	0x00000001056418b4 worker_thread + 41539764 (mono-os-mutex.h:216)
3   MyAPP                      	0x000000010564b910 start_wrapper + 41580816 (threads.c:829)
4   libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
5   libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
6   libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 13 name:  Threadpool worker
Thread 13:
0   libsystem_kernel.dylib        	0x00000001839c40f0 __psynch_cvwait + 8
1   libsystem_pthread.dylib       	0x0000000183adef74 _pthread_cond_wait$VARIANT$armv81 + 624
2   MyAPP                      	0x00000001056418b4 worker_thread + 41539764 (mono-os-mutex.h:216)
3   MyAPP                      	0x000000010564b910 start_wrapper + 41580816 (threads.c:829)
4   libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
5   libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
6   libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 14 name:  Threadpool worker
Thread 14:
0   libSkiaSharp                  	0x000000010606b6fc 0x105cc4000 + 3831548
1   libSkiaSharp                  	0x00000001061124f0 0x105cc4000 + 4515056
2   libSkiaSharp                  	0x00000001061130a4 0x105cc4000 + 4518052
3   libSkiaSharp                  	0x0000000106066a78 0x105cc4000 + 3811960
4   libSkiaSharp                  	0x0000000106066dd8 0x105cc4000 + 3812824
5   libSkiaSharp                  	0x0000000105fa6d78 0x105cc4000 + 3026296
6   MyAPP                      	0x0000000104f1ce08 wrapper_managed_to_native_SkiaSharp_SkiaApi_sk_canvas_draw_path_intptr_intptr_intptr + 34049544 (/<unknown>:1)
7   MyAPP                      	0x0000000104ef8490 SkiaSharp_SKCanvas_DrawPath_SkiaSharp_SKPath_SkiaSharp_SKPaint + 33899664 (/<unknown>:1)
8   MyAPP                      	0x0000000104ec1658 NovMobilityGDI_Drawing_Graphics_DrawPath_NovMobilityGDI_Drawing_Pen_NovMobilityGDI_Drawing_GraphicsPath + 33674840 (Graphics.cs:211)
9   MyAPP                      	0x00000001049d2600 EDRControls_StripChart_1_EDRControls_TimeTag_DrawTraceData_NovMobilityGDI_Drawing_Graphics_int_int + 28501504 (StripChart.cs:2455)
10  MyAPP                      	0x00000001049d1e98 EDRControls_StripChart_1_EDRControls_TimeTag_DrawChart_NovMobilityGDI_Drawing_Graphics_int_int + 28499608 (StripChart.cs:2429)
11  MyAPP                      	0x00000001049ce824 EDRControls_StripChart_1_EDRControls_TimeTag_DrawChart_NovMobilityGDI_Drawing_Graphics + 28485668 (StripChart.cs:2241)
12  MyAPP                      	0x00000001049c4994 EDRControls_StripChart_1_EDRControls_TimeTag_ResumeLayout + 28445076 (StripChart.cs:1502)
13  MyAPP                      	0x00000001049c45e0 EDRControls_StripChart_1_EDRControls_TimeTag_SetHistoricalData_System_Collections_Generic_List_1_EDRControls_StripChart_1_TraceData_EDRControls_TimeTag___EDRControls_TimeTag___long + 28444128 (StripChart.cs:1481)
14  MyAPP                      	0x00000001032765d0 MyAPP_Layouts_RigDetails_RigChartsTab_UpdateTimeHistory_MyAPP_Infrastructure_ChartStripContainer_MyAPP_Infrastructure_TimeHistoricalDataRequest_MyAPP_PCL_HistoricalDataWrapper + 4007376 (RigChartsTab.xaml.cs:3259)
15  MyAPP                      	0x0000000103270a98 MyAPP_Layouts_RigDetails_RigChartsTab_OnHistoricalDataCompleted_object_MyAPP_Infrastructure_HistoricalDataCompletionEventArgs + 3984024 (RigChartsTab.xaml.cs:2839)
16  MyAPP                      	0x000000010355a840 MyAPP_Infrastructure_HistoricalRequestManager__c__DisplayClass41_0__InitializeHistoricalDataAsyncb__7_System_Threading_Tasks_Task_1_MyAPP_Infrastructure_HistoricalCacheRequest + 7039040 (HistoricalRequestManager.cs:649)
17  MyAPP                      	0x0000000103bcd32c gsharedvt_out_trampoline + 220
18  MyAPP                      	0x0000000103b1b9f4 System_Threading_Tasks_ContinuationResultTaskFromResultTask_2_TAntecedentResult_GSHAREDVT_TResult_GSHAREDVT_InnerInvoke + 244
19  MyAPP                      	0x0000000103a5b904 System_Threading_Tasks_Task_Execute + 68
20  MyAPP                      	0x0000000103a5c168 System_Threading_Tasks_Task_ExecutionContextCallback_object + 88
21  MyAPP                      	0x0000000103a38ef4 System_Threading_ExecutionContext_RunInternal_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 404
22  MyAPP                      	0x0000000103a38d4c System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 44
23  MyAPP                      	0x0000000103a5c094 System_Threading_Tasks_Task_ExecuteWithThreadLocal_System_Threading_Tasks_Task_ + 340
24  MyAPP                      	0x0000000103a5beb8 System_Threading_Tasks_Task_ExecuteEntry_bool + 280
25  MyAPP                      	0x0000000103a5bd28 System_Threading_Tasks_Task_System_Threading_IThreadPoolWorkItem_ExecuteWorkItem + 24
26  MyAPP                      	0x0000000103a4195c System_Threading_ThreadPoolWorkQueue_Dispatch + 460
27  MyAPP                      	0x0000000104602ce0 ObjCRuntime_Runtime_ThreadPoolDispatcher_System_Func_1_bool + 24505568 (Runtime.cs:244)
28  MyAPP                      	0x0000000103a43508 System_Threading__ThreadPoolWaitCallback_PerformWaitCallback + 136
29  MyAPP                      	0x0000000103b981b4 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 244
30  MyAPP                      	0x00000001055a4b84 mono_jit_runtime_invoke + 40897412 (mini-runtime.c:2526)
31  MyAPP                      	0x000000010561e238 do_runtime_invoke + 41394744 (object.c:2829)
32  MyAPP                      	0x0000000105643ef0 worker_callback + 41549552 (threadpool.c:360)
33  MyAPP                      	0x00000001056416d8 worker_thread + 41539288 (threadpool-worker-default.c:477)
34  MyAPP                      	0x000000010564b910 start_wrapper + 41580816 (threads.c:829)
35  libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
36  libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
37  libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 15 name:  AVAudioSession Notify Thread
Thread 15:
0   libsystem_kernel.dylib        	0x00000001839a3568 mach_msg_trap + 8
1   libsystem_kernel.dylib        	0x00000001839a33e0 mach_msg + 72
2   CoreFoundation                	0x0000000183e5a308 __CFRunLoopServiceMachPort + 196
3   CoreFoundation                	0x0000000183e57ed4 __CFRunLoopRun + 1424
4   CoreFoundation                	0x0000000183d77e58 CFRunLoopRunSpecific + 436
5   AVFAudio                      	0x00000001896dddc4 GenericRunLoopThread::Entry+ 564676 (void*) + 164
6   AVFAudio                      	0x0000000189708830 CAPThread::Entry+ 739376 (CAPThread*) + 84
7   libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
8   libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
9   libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 16 name:  Threadpool worker
Thread 16:
0   libsystem_kernel.dylib        	0x00000001839c40f0 __psynch_cvwait + 8
1   libsystem_pthread.dylib       	0x0000000183adef74 _pthread_cond_wait$VARIANT$armv81 + 624
2   MyAPP                      	0x00000001056418b4 worker_thread + 41539764 (mono-os-mutex.h:216)
3   MyAPP                      	0x000000010564b910 start_wrapper + 41580816 (threads.c:829)
4   libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
5   libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
6   libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 17 name:  Threadpool worker
Thread 17:
0   libsystem_kernel.dylib        	0x00000001839c40f0 __psynch_cvwait + 8
1   libsystem_pthread.dylib       	0x0000000183adef74 _pthread_cond_wait$VARIANT$armv81 + 624
2   MyAPP                      	0x00000001056418b4 worker_thread + 41539764 (mono-os-mutex.h:216)
3   MyAPP                      	0x000000010564b910 start_wrapper + 41580816 (threads.c:829)
4   libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
5   libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
6   libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 18 name:  tid_7d5f
Thread 18 Crashed:
0   libsystem_kernel.dylib        	0x00000001839c42e8 __pthread_kill + 8
1   libsystem_pthread.dylib       	0x0000000183add748 pthread_kill$VARIANT$armv81 + 360
2   libsystem_c.dylib             	0x0000000183932fbc abort + 140
3   MyAPP                      	0x0000000102eaba7c -[PLCrashReporter generateLiveReportWithThread:] + 0
4   CoreFoundation                	0x0000000183eb26d8 __handleUncaughtException + 628
5   libobjc.A.dylib               	0x00000001830f8804 _objc_terminate+ 34820 () + 112
6   libc++abi.dylib               	0x00000001830e854c std::__terminate(void (*)+ 107852 ()) + 16
7   libc++abi.dylib               	0x00000001830e7ea8 __cxxabiv1::exception_cleanup_func+ 106152 (_Unwind_Reason_Code, _Unwind_Exception*) + 0
8   libobjc.A.dylib               	0x00000001830f865c _objc_exception_destructor+ 34396 (void*) + 0
9   CoreFoundation                	0x0000000183eb19f0 -[__NSSingleObjectEnumerator initWithObject:] + 0
10  UIKit                         	0x000000018d38ac04 -[UIView+ 27652 (Hierarchy) subviews] + 344
11  UIKit                         	0x000000018d67e200 -[UIView+ 3121664 (CALayerDelegate) _wantsReapplicationOfAutoLayoutWithLayoutDirtyOnEntry:] + 72
12  UIKit                         	0x000000018d390f48 -[UIView+ 53064 (CALayerDelegate) layoutSublayersOfLayer:] + 1348
13  QuartzCore                    	0x0000000187ef5998 -[CALayer layoutSublayers] + 184
14  QuartzCore                    	0x0000000187ef9b20 CA::Layer::layout_if_needed+ 1207072 (CA::Transaction*) + 332
15  QuartzCore                    	0x0000000187e6636c CA::Context::commit_transaction+ 602988 (CA::Transaction*) + 336
16  QuartzCore                    	0x0000000187e8db90 CA::Transaction::commit+ 764816 () + 540
17  MyAPP                      	0x00000001046bbcd8 wrapper_managed_to_native_ObjCRuntime_Messaging_void_objc_msgSend_intptr_intptr + 25263320 (/<unknown>:1)
18  MyAPP                      	0x0000000104663ca8 CoreAnimation_CATransaction_Commit + 24902824 (CATransaction.g.cs:89)
19  MyAPP                      	0x000000010453db7c Xamarin_Forms_Platform_iOS_CADisplayLinkTicker_StartThread + 23698300 (/C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.iOS\CADisplayLinkTicker.cs:63)
20  MyAPP                      	0x0000000103a3b33c System_Threading_ThreadHelper_ThreadStart_Context_object + 188
21  MyAPP                      	0x0000000103a38ef4 System_Threading_ExecutionContext_RunInternal_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 404
22  MyAPP                      	0x0000000103a38d4c System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 44
23  MyAPP                      	0x0000000103a38ccc System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object + 76
24  MyAPP                      	0x0000000103a3b4a4 System_Threading_ThreadHelper_ThreadStart + 52
25  MyAPP                      	0x0000000103b981b4 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 244
26  MyAPP                      	0x00000001055a4b84 mono_jit_runtime_invoke + 40897412 (mini-runtime.c:2526)
27  MyAPP                      	0x000000010561e238 do_runtime_invoke + 41394744 (object.c:2829)
28  MyAPP                      	0x000000010564b934 start_wrapper + 41580852 (threads.c:839)
29  libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
30  libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
31  libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 19 name:  realTimeStreamf856af9b-04c3-47d9-82ca-898aa5ef80e7
Thread 19:
0   libsystem_kernel.dylib        	0x00000001839c40f0 __psynch_cvwait + 8
1   libsystem_pthread.dylib       	0x0000000183adef74 _pthread_cond_wait$VARIANT$armv81 + 624
2   MyAPP                      	0x0000000105658478 mono_os_cond_timedwait + 41632888 (mono-os-mutex.h:173)
3   MyAPP                      	0x000000010565712c mono_w32handle_timedwait_signal_handle + 41627948 (w32handle.c:976)
4   MyAPP                      	0x0000000105656fdc mono_w32handle_wait_one + 41627612 (w32handle.c:1213)
5   MyAPP                      	0x0000000105610700 ves_icall_System_Threading_Monitor_Monitor_wait + 41338624 (monitor.c:1392)
6   MyAPP                      	0x0000000103a3a908 wrapper_managed_to_native_System_Threading_Monitor_Monitor_wait_object_int + 104
7   MyAPP                      	0x0000000103a3a9b0 System_Threading_Monitor_ObjWait_bool_int_object + 80
8   MyAPP                      	0x0000000103a3a4ac System_Threading_Monitor_Wait_object_int_bool + 44
9   MyAPP                      	0x0000000103a3a530 System_Threading_Monitor_Wait_object + 32
10  MyAPP                      	0x00000001052e83b8 WRQCommon_WRQResponseStream_Read_byte___int_int + 38028216 (WRQResponseStream.cs:261)
11  MyAPP                      	0x00000001039c9b70 System_IO_BinaryReader_FillBuffer_int + 256
12  MyAPP                      	0x00000001039c8964 System_IO_BinaryReader_ReadInt64 + 36
13  MyAPP                      	0x0000000104b002c8 WellDataCommon_Portable_RtDataService_ProtocolDriver + 29737672 (/<unknown>:1)
14  MyAPP                      	0x0000000103a3b33c System_Threading_ThreadHelper_ThreadStart_Context_object + 188
15  MyAPP                      	0x0000000103a38ef4 System_Threading_ExecutionContext_RunInternal_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 404
16  MyAPP                      	0x0000000103a38d4c System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 44
17  MyAPP                      	0x0000000103a38ccc System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object + 76
18  MyAPP                      	0x0000000103a3b4a4 System_Threading_ThreadHelper_ThreadStart + 52
19  MyAPP                      	0x0000000103b981b4 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 244
20  MyAPP                      	0x00000001055a4b84 mono_jit_runtime_invoke + 40897412 (mini-runtime.c:2526)
21  MyAPP                      	0x000000010561e238 do_runtime_invoke + 41394744 (object.c:2829)
22  MyAPP                      	0x000000010564b934 start_wrapper + 41580852 (threads.c:839)
23  libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
24  libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
25  libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 20 name:  tid_1222b
Thread 20:
0   libsystem_kernel.dylib        	0x00000001839c4414 __recvfrom + 8
1   MyAPP                      	0x000000010566076c mono_w32socket_recvfrom + 41666412 (w32socket-unix.c:321)
2   MyAPP                      	0x0000000105663900 ves_icall_System_Net_Sockets_Socket_Receive_internal + 41679104 (w32socket.c:1391)
3   MyAPP                      	0x00000001041b0700 wrapper_managed_to_native_System_Net_Sockets_Socket_Receive_internal_intptr_byte___int_int_System_Net_Sockets_SocketFlags_int__bool + 144
4   MyAPP                      	0x00000001041b0624 System_Net_Sockets_Socket_Receive_internal_System_Net_Sockets_SafeSocketHandle_byte___int_int_System_Net_Sockets_SocketFlags_int__bool + 19973668 (Socket.cs:1527)
5   MyAPP                      	0x00000001041af980 System_Net_Sockets_Socket_Receive_byte___int_int_System_Net_Sockets_SocketFlags_System_Net_Sockets_SocketError_ + 19970432 (Socket.cs:1312)
6   MyAPP                      	0x00000001041a9d30 System_Net_Sockets_Socket_Receive_byte___int_int_System_Net_Sockets_SocketFlags + 19946800 (Socket.cs:1769)
7   MyAPP                      	0x00000001041a5b14 System_Net_Sockets_NetworkStream_Read_byte___int_int + 19929876 (NetworkStream.cs:513)
8   MyAPP                      	0x00000001040bfa18 Mono_Net_Security_MobileAuthenticatedStream_InnerRead_int + 18987544 (MobileAuthenticatedStream.cs:530)
9   MyAPP                      	0x00000001040bc590 Mono_Net_Security_AsyncProtocolRequest_ProcessOperation_Mono_Net_Security_AsyncOperationStatus + 18974096 (AsyncProtocolRequest.cs:253)
10  MyAPP                      	0x00000001040bc438 Mono_Net_Security_AsyncProtocolRequest_ProcessOperation + 18973752 (AsyncProtocolRequest.cs:218)
11  MyAPP                      	0x00000001040bc2c8 Mono_Net_Security_AsyncProtocolRequest_StartOperation + 18973384 (AsyncProtocolRequest.cs:200)
12  MyAPP                      	0x00000001040bc1e0 Mono_Net_Security_AsyncProtocolRequest_StartOperation_Mono_Net_Security_AsyncOperation + 18973152 (AsyncProtocolRequest.cs:190)
13  MyAPP                      	0x00000001040bf498 Mono_Net_Security_MobileAuthenticatedStream_StartOperation_Mono_Net_Security_AsyncProtocolRequest__Mono_Net_Security_BufferOffsetSize2__Mono_Net_Security_AsyncOperation_Mono_Net_Security_AsyncProtocolRequest_string + 18986136 (MobileAuthenticatedStream.cs:365)
14  MyAPP                      	0x00000001040bf344 Mono_Net_Security_MobileAuthenticatedStream_ProcessReadOrWrite_Mono_Net_Security_AsyncProtocolRequest__Mono_Net_Security_BufferOffsetSize2__Mono_Net_Security_AsyncOperation_Mono_Net_Security_BufferOffsetSize_System_Net_LazyAsyncResult + 18985796 (MobileAuthenticatedStream.cs:353)
15  MyAPP                      	0x00000001040bee2c Mono_Net_Security_MobileAuthenticatedStream_Read_byte___int_int + 18984492 (MobileAuthenticatedStream.cs:293)
16  MyAPP                      	0x00000001041bff24 System_Net_Security_SslStream_Read_byte___int_int + 20037412 (SslStream.cs:353)
17  MyAPP                      	0x00000001039c9b70 System_IO_BinaryReader_FillBuffer_int + 256
18  MyAPP                      	0x00000001039c87c4 System_IO_BinaryReader_ReadInt32 + 164
19  MyAPP                      	0x00000001054b31f0 WRQClient_WRQStreamClient_ProcessStreamContent_object + 39907824 (WRQClient.cs:301)
20  MyAPP                      	0x0000000103a3b380 System_Threading_ThreadHelper_ThreadStart_Context_object + 256
21  MyAPP                      	0x0000000103a38ef4 System_Threading_ExecutionContext_RunInternal_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 404
22  MyAPP                      	0x0000000103a38d4c System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 44
23  MyAPP                      	0x0000000103a38ccc System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object + 76
24  MyAPP                      	0x0000000103a3b40c System_Threading_ThreadHelper_ThreadStart_object + 108
25  MyAPP                      	0x0000000103b981b4 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 244
26  MyAPP                      	0x00000001055a4b84 mono_jit_runtime_invoke + 40897412 (mini-runtime.c:2526)
27  MyAPP                      	0x000000010561e238 do_runtime_invoke + 41394744 (object.c:2829)
28  MyAPP                      	0x000000010564b934 start_wrapper + 41580852 (threads.c:839)
29  libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
30  libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
31  libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 21 name:  Threadpool worker
Thread 21:
0   libsystem_kernel.dylib        	0x00000001839c40f0 __psynch_cvwait + 8
1   libsystem_pthread.dylib       	0x0000000183adef74 _pthread_cond_wait$VARIANT$armv81 + 624
2   MyAPP                      	0x00000001056418b4 worker_thread + 41539764 (mono-os-mutex.h:216)
3   MyAPP                      	0x000000010564b910 start_wrapper + 41580816 (threads.c:829)
4   libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
5   libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
6   libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 22 name:  Threadpool worker
Thread 22:
0   libsystem_kernel.dylib        	0x00000001839c40f0 __psynch_cvwait + 8
1   libsystem_pthread.dylib       	0x0000000183adef74 _pthread_cond_wait$VARIANT$armv81 + 624
2   MyAPP                      	0x00000001056418b4 worker_thread + 41539764 (mono-os-mutex.h:216)
3   MyAPP                      	0x000000010564b910 start_wrapper + 41580816 (threads.c:829)
4   libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
5   libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
6   libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 23 name:  tid_d03b
Thread 23:
0   libsystem_kernel.dylib        	0x00000001839c40f0 __psynch_cvwait + 8
1   libsystem_pthread.dylib       	0x0000000183adef74 _pthread_cond_wait$VARIANT$armv81 + 624
2   MyAPP                      	0x00000001056b444c mono_thread_info_sleep + 42009676 (mono-os-mutex.h:216)
3   MyAPP                      	0x00000001056412b8 monitor_thread + 41538232 (threadpool-worker-default.c:693)
4   MyAPP                      	0x000000010564b910 start_wrapper + 41580816 (threads.c:829)
5   libsystem_pthread.dylib       	0x0000000183ad82b4 _pthread_body + 308
6   libsystem_pthread.dylib       	0x0000000183ad8180 _pthread_body + 0
7   libsystem_pthread.dylib       	0x0000000183ad6b74 thread_start + 4

Thread 18 crashed with ARM Thread State (64-bit):
    x0: 0x0000000000000000   x1: 0x0000000000000000   x2: 0x0000000000000000   x3: 0xffffffffffffffff
    x4: 0x0000000000000010   x5: 0x0000000000002b87   x6: 0x00000001d0382be0   x7: 0x0000000000002b88
    x8: 0x0000000008000000   x9: 0x0000000004000000  x10: 0x0000000183add5e0  x11: 0x00000001b743a004
   x12: 0x00000001b743a004  x13: 0x0000000000000018  x14: 0x0000000000000001  x15: 0x0000000000000881
   x16: 0x0000000000000148  x17: 0x0000000000000000  x18: 0xfffffff0146dd260  x19: 0x0000000000000006
   x20: 0x000000016ec27000  x21: 0x00000001c42a0fc0  x22: 0x0000000000007d5f  x23: 0x000000016ec270e0
   x24: 0x00000001b5118000  x25: 0x000000018e1275fe  x26: 0x000000018e1313b5  x27: 0x0000000183f4a23f
   x28: 0x00000001b384ea18   fp: 0x000000016ec22d80   lr: 0x0000000183add748
    sp: 0x000000016ec22d50   pc: 0x00000001839c42e8 cpsr: 0x00000000

Binary Images:
0x102ea4000 - 0x1057e7fff MyAPP arm64  <2e9158b4942a3684976ad9088358b3f4> /var/containers/Bundle/Application/CF6854E5-6845-4FFE-A853-AF998E517D4E/MyAPP.app/MyAPP
0x105c28000 - 0x105c67fff dyld arm64  <477a8a1f098b3a80860d656a3f4918ea> /usr/lib/dyld
0x105cc4000 - 0x1061bbfff libSkiaSharp arm64  <fbe96e043c7f3abeb2382c3152221eec> /var/containers/Bundle/Application/CF6854E5-6845-4FFE-A853-AF998E517D4E/MyAPP.app/Frameworks/libSkiaSharp.framework/libSkiaSharp
0x183072000 - 0x183073fff libSystem.B.dylib arm64  <f1a8dae6cdac3bdeb67f9a56e4acb0d0> /usr/lib/libSystem.B.dylib
0x183074000 - 0x1830cdfff libc++.1.dylib arm64  <aee157a049663aa88c4e928768cfd553> /usr/lib/libc++.1.dylib
0x1830ce000 - 0x1830eefff libc++abi.dylib arm64  <b4f54419327f3bfea747549b84dad328> /usr/lib/libc++abi.dylib
0x1830f0000 - 0x1837abfff libobjc.A.dylib arm64  <3a9d464322eb3285bc88fabf7cec20ed> /usr/lib/libobjc.A.dylib
0x1837ac000 - 0x1837b0fff libcache.dylib arm64  <5d31b020cbde3110981e6a8213297535> /usr/lib/system/libcache.dylib
0x1837b1000 - 0x1837bcfff libcommonCrypto.dylib arm64  <5fcc43ca8cd9305091129711db270b8c> /usr/lib/system/libcommonCrypto.dylib
0x1837bd000 - 0x1837c0fff libcompiler_rt.dylib arm64  <49e30d90aab53f8a99c9109db350ae39> /usr/lib/system/libcompiler_rt.dylib
0x1837c1000 - 0x1837c8fff libcopyfile.dylib arm64  <bc50a65225833e458ae22db52300bf10> /usr/lib/system/libcopyfile.dylib
0x1837c9000 - 0x18382cfff libcorecrypto.dylib arm64  <1647a3e06adc30b3b8f8298f897d6e87> /usr/lib/system/libcorecrypto.dylib
0x18382d000 - 0x183892fff libdispatch.dylib arm64  <25e5e6ee10093937b122c4b509716294> /usr/lib/system/libdispatch.dylib
0x183893000 - 0x1838adfff libdyld.dylib arm64  <aa89b903caf232bebaea4294ee62a6d2> /usr/lib/system/libdyld.dylib
0x1838ae000 - 0x1838aefff liblaunch.dylib arm64  <ca90373a022d3c38ac7ecd736c13bf9b> /usr/lib/system/liblaunch.dylib
0x1838af000 - 0x1838b4fff libmacho.dylib arm64  <5cf371e4795437008e8ba71f7c18c3e0> /usr/lib/system/libmacho.dylib
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0x198776000 - 0x19887dfff SafariServices arm64  <31dec52bc9c0330e963f8cb14ed24930> /System/Library/Frameworks/SafariServices.framework/SafariServices
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0x198bfa000 - 0x198cf4fff MessageUI arm64  <86d11145916a3a81a425402bbfe289e4> /System/Library/Frameworks/MessageUI.framework/MessageUI
0x199f52000 - 0x199f61fff NewsFoundation arm64  <bb43db7444a4308f8deb47e072e15208> /System/Library/PrivateFrameworks/NewsFoundation.framework/NewsFoundation
0x199f62000 - 0x19a1b7fff NewsTransport arm64  <247b8be816813bcb879020dc9784fa69> /System/Library/PrivateFrameworks/NewsTransport.framework/NewsTransport
0x19a201000 - 0x19a256fff CallKit arm64  <9fbaff85ecd43e1ab9c95e5622b14f78> /System/Library/Frameworks/CallKit.framework/CallKit
0x19a2b6000 - 0x19a312fff IMAVCore arm64  <1dc9bf719d1f3019a7bc0de2f1a11fcb> /System/Library/PrivateFrameworks/IMAVCore.framework/IMAVCore
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0x1a6a39000 - 0x1a6a39fff libmetal_timestamp.dylib arm64  <f18a626680ea3501b7fdf6042433c155> /System/Library/PrivateFrameworks/GPUCompiler.framework/Libraries/libmetal_timestamp.dylib
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0x1a966f000 - 0x1a9674fff TextInputUI arm64  <c60ab0c23a5235fca90ad0601ab45c21> /System/Library/PrivateFrameworks/TextInputUI.framework/TextInputUI
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0x1ab7e6000 - 0x1ab817fff libclosured.dylib arm64  <aefc8840686d30a88277d7efcb70abaf> /usr/lib/closure/libclosured.dylib

EOF

Basic Information

• Version with issue: XF

• Last known good version:

• IDE: VS 2017

• Platform Target Frameworks:

• iOS: 9, 10, 11

• XCode 9.2

• Nuget Packages: Xamarin.Forms 2.3.4.270

• Affected Devices: iOS Phones

[PureWeen]

Would it be possible to provide a repro project for this issue so that we can accurately reproduce and fix?

[samhouts]

@nestor-nov Have you had a chance to together a reproduction project? Thanks

[PradoVargasN]

I'll provide it next week.

[michaelkociansde]

Have you solved this problem? I have very similar one. StackTrace points to the SkiaSharp surface.canvas.DrawPath(path, Paint); in method bound to the event PaintSurface. The crash occurs randomly but about 30-90seconds after the startup.

EDIT: downgrade to 1.59.0 solved it

[PureWeen]

Closing for now. If still happening please attach a repro and reopen

[PradoVargasN]

@PureWeen @samhouts please reopen.

CADError.zip

Reproduction project, this is an iOS-only issue, also it only happens on physical devices we used an iPhone 8 (MQ6G2VC/A) version 11.2.6

For us it takes 1 to 5 minutes for the app to crash.

Thanks.

[jassmith]

Annoying thanks, this is almost certainly due to the off thread update to CALayer (which is allowed normally). We'll probably need to provide a mechanism to disable that wholesale for users like yourself.