xamarin-macios
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xamarin
Issues with unhandled exceptions
Steps to Reproduce
On a Mac, after installing the latest 6.0.300 SDK and the ios workload:
dotnet new ios- Edit
AppDelegate.cs. At the end ofFinishedLaunching, beforereturn true;insert the following code:AppDomain.CurrentDomain.UnhandledException += delegate { Console.WriteLine("In UnhandledException Handler"); }; AppDomain.CurrentDomain.FirstChanceException += delegate { Console.WriteLine("In FirstChanceException Handler"); }; throw new Exception("Test Exception"); dotnet run
Expected Behavior
The output should indicate that the FirstChanceException handler fires once, and then the UnhandledException handler should fire once. Then I should get a crash report window from macOS (if applicable).
Actual Behavior
The log shows that the FirstChanceException handler fires over 1000 times (the exact number seems to vary). The UnhandledException handler never fires. I do get the crash report window from macOS.
Environment
Version information
Visual Studio Enterprise 2022 for Mac Preview
Version 17.3 Preview (17.3 build 198)
Installation UUID: 1a1c51f5-b451-405d-a88b-c8682f3c4d95
Runtime
.NET 6.0.3 (64-bit)
Architecture: Arm64
Roslyn (Language Service)
4.2.0-3.22181.8+a59a22c6f3c2cc1883e20cece412209f18f4a29f
NuGet
Version: 6.0.0.262
.NET SDK (Arm64)
SDK: /usr/local/share/dotnet/sdk/6.0.300/Sdks
SDK Version: 6.0.300
MSBuild SDKs: /usr/local/share/dotnet/sdk/6.0.300/Sdks
.NET SDK (x64)
SDK Versions:
6.0.300
5.0.408
3.1.419
2.1.818
.NET Runtime (Arm64)
Runtime: /usr/local/share/dotnet/dotnet
Runtime Version: 6.0.5
.NET Runtime (x64)
Runtime: /usr/local/share/dotnet/x64/dotnet
Runtime Versions:
6.0.5
5.0.17
3.1.25
2.1.30
Xamarin.Profiler
Version: 1.8.0.19
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler
Updater
Version: 11
Apple Developer Tools
Xcode 13.4.1 (20504)
Build 13F100
Xamarin.Mac
Version: 8.10.0.1 (Visual Studio Enterprise)
Hash: 568bdb24e
Branch: d17-2
Build date: 2022-04-08 18:52:56-0400
Xamarin.iOS
Version: 15.10.0.1 (Visual Studio Enterprise)
Hash: 568bdb24e
Branch: d17-2
Build date: 2022-04-08 18:52:57-0400
Xamarin Designer
Version: 17.3.0.70
Hash: 4cf1a2208
Branch: remotes/origin/d17-3
Build date: 2022-05-25 15:22:03 UTC
Xamarin.Android
Version: 12.3.99.58 (Visual Studio Enterprise)
Commit: xamarin-android/main/64b22fc
Android SDK: /Users/matt/Library/Android/sdk
Supported Android versions:
12.1 (API level 32)
12.0 (API level 31)
11.0 (API level 30)
9.0 (API level 28)
SDK Command-line Tools Version: 5.0
SDK Platform Tools Version: 33.0.1
SDK Build Tools Version: 33.0.0 rc4
Build Information:
Mono: adf1bc4
Java.Interop: xamarin/java.interop/release/6.0.3xx@2a882d2d
ProGuard: Guardsquare/proguard/v7.0.1@912d149
SQLite: xamarin/sqlite/3.38.2@7b1e016
Xamarin.Android Tools: xamarin/xamarin-android-tools/main@fc3c2ac
Microsoft Build of OpenJDK
Java SDK: /Library/Java/JavaVirtualMachines/microsoft-11.jdk
11.0.15
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL
Eclipse Temurin JDK
Java SDK: /Library/Java/JavaVirtualMachines/temurin-8.jdk
1.8.0.302
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL
Android SDK Manager
Version: 17.2.0.47
Hash: d6dd135
Branch: remotes/origin/dev/tondat/main-1512059~2
Build date: 2022-05-25 15:21:57 UTC
Android Device Manager
Version: 0.0.0.1127
Hash: 4bb4d48
Branch: remotes/origin/dev/tondat/main-1536295~1
Build date: 2022-05-25 15:21:57 UTC
Build Information
Release ID: 1703000198
Git revision: b61a5879556b3b4d5270ffffd9431e5ec7db233d
Build date: 2022-05-25 15:20:15+00
Build branch: release-17.3
Build lane: release-17.3
Operating System
Mac OS X 12.4.0
Darwin 21.5.0 Darwin Kernel Version 21.5.0
Tue Apr 26 21:08:37 PDT 2022
root:xnu-8020.121.3~4/RELEASE_ARM64_T6000 arm64
Crash Report
-------------------------------------
Translated Report (Full Report Below)
-------------------------------------
Incident Identifier: A43C9AF2-C7F0-4138-8A6F-13803FED9E14
CrashReporter Key: 033C27F8-F8D2-CF5C-D530-420FAA271D3D
Hardware Model: MacBookPro18,1
Process: IosApp1 [88916]
Path: /Users/USER/Library/Developer/CoreSimulator/Devices/02F1B274-3BDC-471F-9304-EC96459FB2BC/data/Containers/Bundle/Application/8F088341-30E9-4168-81FF-61B555F0DF29/IosApp1.app/IosApp1
Identifier: com.companyname.IosApp1
Version: 1.0 (1.0)
Code Type: X86-64 (Native)
Role: Foreground
Parent Process: launchd_sim [25203]
Coalition: com.apple.CoreSimulator.SimDevice.02F1B274-3BDC-471F-9304-EC96459FB2BC [9251]
Responsible Process: SimulatorTrampoline [1443]
Date/Time: 2022-06-11 15:36:42.3685 -0700
Launch Time: 2022-06-11 15:36:39.7411 -0700
OS Version: macOS 12.4 (21F79)
Release Type: User
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_PROTECTION_FAILURE at 0x000000030c5dbb34
Exception Codes: 0x0000000000000002, 0x000000030c5dbb34
VM Region Info: 0x30c5dbb34 is in 0x308dd8000-0x30c5dc000; bytes after start: 58735412 bytes before end: 1227
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
unused shlib __TEXT 2049c2000-2049c5000 [ 12K] r--/r-- SM=NUL ... this process
GAP OF 0x104413000 BYTES
---> Stack Guard 308dd8000-30c5dc000 [ 56.0M] ---/rwx SM=NUL
Stack 30c5dc000-30cdd8000 [ 8176K] rw-/rwx SM=PRV
Exception Note: EXC_CORPSE_NOTIFY
Termination Reason: SIGNAL 11 Segmentation fault: 11
Terminating Process: exc handler [88916]
Triggered by Thread: 0
Last Exception Backtrace:
0 CoreFoundation 0x11196e5f4 __exceptionPreprocess + 226
1 libobjc.A.dylib 0x11e8f5a45 objc_exception_throw + 48
2 libxamarin-dotnet-debug.dylib 0x10d3e4f6f xamarin_process_managed_exception + 943
3 libxamarin-dotnet-debug.dylib 0x10d3f1a42 xamarin_invoke_trampoline + 8578
4 libxamarin-dotnet-debug.dylib 0x10d3f90b9 xamarin_arch_trampoline + 105
5 libxamarin-dotnet-debug.dylib 0x10d3fa29e xamarin_x86_64_common_trampoline + 118
6 UIKitCore 0x12a048593 -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 214
7 UIKitCore 0x12a04a284 -[UIApplication _callInitializationDelegatesWithActions:forCanvas:payload:fromOriginatingProcess:] + 4128
8 UIKitCore 0x12a04fc24 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1190
9 UIKitCore 0x1295c046a -[_UISceneLifecycleMultiplexer completeApplicationLaunchWithFBSScene:transitionContext:] + 122
10 UIKitCore 0x129bb4592 _UIScenePerformActionsWithLifecycleActionMask + 88
11 UIKitCore 0x1295c0f64 __101-[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:]_block_invoke + 198
12 UIKitCore 0x1295c09a1 -[_UISceneLifecycleMultiplexer _performBlock:withApplicationOfDeactivationReasons:fromReasons:] + 252
13 UIKitCore 0x1295c0d9a -[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:] + 831
14 UIKitCore 0x1295c0647 -[_UISceneLifecycleMultiplexer uiScene:transitionedFromState:withTransitionContext:] + 354
15 UIKitCore 0x1295caa8f __186-[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:]_block_invoke + 178
16 UIKitCore 0x129a97b01 +[BSAnimationSettings(UIKit) tryAnimatingWithSettings:actions:completion:] + 859
17 UIKitCore 0x129bd1a19 _UISceneSettingsDiffActionPerformChangesWithTransitionContext + 246
18 UIKitCore 0x1295ca713 -[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:] + 346
19 UIKitCore 0x1293c7af5 __64-[UIScene scene:didUpdateWithDiff:transitionContext:completion:]_block_invoke.578 + 796
20 UIKitCore 0x1293c64c7 -[UIScene _emitSceneSettingsUpdateResponseForCompletion:afterSceneUpdateWork:] + 253
21 UIKitCore 0x1293c76b5 -[UIScene scene:didUpdateWithDiff:transitionContext:completion:] + 255
22 UIKitCore 0x12a04e545 -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 513
23 UIKitCore 0x129ac8afe -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 355
24 FrontBoardServices 0x12028bcdd -[FBSScene _callOutQueue_agent_didCreateWithTransitionContext:completion:] + 415
25 FrontBoardServices 0x1202b8216 __94-[FBSWorkspaceScenesClient createWithSceneID:groupID:parameters:transitionContext:completion:]_block_invoke.180 + 102
26 FrontBoardServices 0x12029a0ef -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:] + 209
27 FrontBoardServices 0x1202b7df5 __94-[FBSWorkspaceScenesClient createWithSceneID:groupID:parameters:transitionContext:completion:]_block_invoke + 352
28 libdispatch.dylib 0x11dacdb25 _dispatch_client_callout + 8
29 libdispatch.dylib 0x11dad0c9f _dispatch_block_invoke_direct + 281
30 FrontBoardServices 0x1202deda3 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 30
31 FrontBoardServices 0x1202dec99 -[FBSSerialQueue _targetQueue_performNextIfPossible] + 174
32 FrontBoardServices 0x1202dedcb -[FBSSerialQueue _performNextFromRunLoopSource] + 19
33 CoreFoundation 0x1118db4a7 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
34 CoreFoundation 0x1118db39f __CFRunLoopDoSource0 + 180
35 CoreFoundation 0x1118da86c __CFRunLoopDoSources0 + 242
36 CoreFoundation 0x1118d4f68 __CFRunLoopRun + 871
37 CoreFoundation 0x1118d4704 CFRunLoopRunSpecific + 562
38 GraphicsServices 0x1207ccc8e GSEventRunModal + 139
39 UIKitCore 0x12a04c65a -[UIApplication _run] + 928
40 UIKitCore 0x12a0512b5 UIApplicationMain + 101
41 ??? 0x15bd78111 ???
42 ??? 0x15bd75453 ???
43 libmonosgen-2.0.dylib 0x10dab9fff mono_jit_runtime_invoke + 2223
44 libmonosgen-2.0.dylib 0x10d9dc318 mono_runtime_invoke_checked + 136
45 libmonosgen-2.0.dylib 0x10d9e30bb mono_runtime_exec_main_checked + 107
46 libmonosgen-2.0.dylib 0x10db1c0b2 mono_jit_exec + 354
47 libxamarin-dotnet-debug.dylib 0x10d3f8f0d xamarin_main + 1949
48 IosApp1 0x1044b1ac4 main + 52 (main.x86_64.mm:65)
49 dyld_sim 0x10cfccf21 start_sim + 10
50 dyld 0x20491251e start + 462
51 ??? 0x3 ???
Thread 0 Crashed:: tid_103 Dispatch queue: com.apple.main-thread
0 <translation info unavailable> 0x104b6ef08 ???
1 <translation info unavailable> 0x104d94608 ???
2 libsystem_trace.dylib 0x11eb0a252 _os_log_with_args_impl + 466
3 CoreFoundation 0x11194ba7e _CFLogvEx3 + 198
4 Foundation 0x11490b328 _NSLogv + 97
5 Foundation 0x11490b3c6 NSLog + 138
6 libSystem.Native.dylib 0x10cefc96a SystemNative_Log + 218
7 ??? 0x161fa4056 ???
Thread 1:: com.apple.rosetta.exceptionserver
0 ??? 0x7ff7ffd389c4 ???
1 ??? 0x7ff7ffd51208 ???
Thread 2:
0 ??? 0x7ff7ffd56814 ???
Thread 3:: SGen worker
0 ??? 0x10489d940 ???
1 <translation info unavailable> 0x104e3f814 ???
2 libsystem_pthread.dylib 0x11f35fa6f _pthread_cond_wait + 1249
3 libmonosgen-2.0.dylib 0x10daa0e93 thread_func + 243
4 libsystem_pthread.dylib 0x11f35f4e1 _pthread_start + 125
5 libsystem_pthread.dylib 0x11f35af6b thread_start + 15
Thread 4:: Finalizer
0 ??? 0x10489d940 ???
1 <translation info unavailable> 0x104e2b75c ???
2 libmonosgen-2.0.dylib 0x10da1e07b finalizer_thread + 299
3 libmonosgen-2.0.dylib 0x10d9f4853 start_wrapper_internal + 371
4 libmonosgen-2.0.dylib 0x10d9f46be start_wrapper + 62
5 libsystem_pthread.dylib 0x11f35f4e1 _pthread_start + 125
6 libsystem_pthread.dylib 0x11f35af6b thread_start + 15
Thread 5:
0 ??? 0x7ff7ffd56814 ???
Thread 6:
0 ??? 0x7ff7ffd56814 ???
Thread 7:: com.apple.uikit.eventfetch-thread
0 ??? 0x10489d940 ???
1 <translation info unavailable> 0x10492568c ???
2 libsystem_kernel.dylib 0x11f2bbce8 mach_msg + 56
3 CoreFoundation 0x1118daacc __CFRunLoopServiceMachPort + 319
4 CoreFoundation 0x1118d50e2 __CFRunLoopRun + 1249
5 CoreFoundation 0x1118d4704 CFRunLoopRunSpecific + 562
6 Foundation 0x114936049 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 213
7 Foundation 0x1149362c2 -[NSRunLoop(NSRunLoop) runUntilDate:] + 72
8 UIKitCore 0x12a10fbda -[UIEventFetcher threadMain] + 491
9 Foundation 0x11495f1a1 __NSThread__start__ + 1009
10 libsystem_pthread.dylib 0x11f35f4e1 _pthread_start + 125
11 libsystem_pthread.dylib 0x11f35af6b thread_start + 15
Thread 8:
0 ??? 0x7ff7ffd56814 ???
Thread 9:: Dispatch queue: com.apple.UIKit.KeyboardManagement
0 ??? 0x10489d940 ???
1 <translation info unavailable> 0x105c75754 ???
2 libdispatch.dylib 0x11dace2b6 _dlock_wait + 45
3 libdispatch.dylib 0x11dace118 _dispatch_thread_event_wait_slow + 40
4 libdispatch.dylib 0x11dadbfbe __DISPATCH_WAIT_FOR_QUEUE__ + 326
5 libdispatch.dylib 0x11dadbb39 _dispatch_sync_f_slow + 202
6 UIKitCore 0x129e67b26 __37-[_UIRemoteKeyboards startConnection]_block_invoke_3 + 98
7 CoreFoundation 0x111974fdc __invoking___ + 140
8 CoreFoundation 0x11197234f -[NSInvocation invoke] + 305
9 Foundation 0x114a310ca __NSXPCCONNECTION_IS_CALLING_OUT_TO_REPLY_BLOCK__ + 17
10 Foundation 0x114a30ca1 -[NSXPCConnection _decodeAndInvokeReplyBlockWithEvent:sequence:replyInfo:] + 629
11 Foundation 0x114a35710 __88-[NSXPCConnection _sendInvocation:orArguments:count:methodSignature:selector:withProxy:]_block_invoke_3 + 205
12 libxpc.dylib 0x11f3ab07e _xpc_connection_reply_callout + 36
13 libxpc.dylib 0x11f3a0578 _xpc_connection_call_reply_async + 69
14 libdispatch.dylib 0x11dacdb8b _dispatch_client_callout3 + 8
15 libdispatch.dylib 0x11dae8fa6 _dispatch_mach_msg_async_reply_invoke + 397
16 libdispatch.dylib 0x11dad3f65 _dispatch_lane_serial_drain + 375
17 libdispatch.dylib 0x11dad4cf8 _dispatch_lane_invoke + 455
18 libdispatch.dylib 0x11dadf97b _dispatch_workloop_worker_thread + 779
19 libsystem_pthread.dylib 0x11f35bfd0 _pthread_wqthread + 326
20 libsystem_pthread.dylib 0x11f35af57 start_wqthread + 15
Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x000000030c5dcdc0 rbx: 0x000000010cefd689 rcx: 0x0000000040000000 rdx: 0x0000000000000000
rdi: 0x000000030c5dcd10 rsi: 0x000000011eb125d0 rbp: 0x000000030c5dccf0 rsp: 0x000000030c5dba20
r8: 0x000000030c5dcdc0 r9: 0x000000000000000c r10: 0x000000010d0ba280 r11: 0x00000001118b3826
r12: 0x0000000040000000 r13: 0x000000010ceee000 r14: 0x000000010cefe510 r15: 0x0000000000000000
rip: <unavailable> rfl: 0x0000000000000202
tmp0: 0xffffffffffffee44 tmp1: 0x0000000104d949e0 tmp2: 0x000000011eb0a252
Binary Images:
0x0 - 0xffffffffffffffff ??? (*) <00000000-0000-0000-0000-000000000000> ???
0x11eaf7000 - 0x11eb0ffff libsystem_trace.dylib (*) <e2edb2f5-e4de-3c55-b5d7-6f9349d6c34d> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_trace.dylib
0x111859000 - 0x111c5efff com.apple.CoreFoundation (6.9) <d7b873d0-2d44-362d-a632-91b54d2dd8c2> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
0x114812000 - 0x114b06fff com.apple.Foundation (6.9) <9827fa7d-2500-32d7-aaaf-288e38b126ab> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/Foundation.framework/Foundation
0x10ceee000 - 0x10cefdfff libSystem.Native.dylib (*) <c66d8418-40f8-3ae7-8bda-7918cb0b6ae4> /Users/USER/Library/Developer/CoreSimulator/Devices/02F1B274-3BDC-471F-9304-EC96459FB2BC/data/Containers/Bundle/Application/8F088341-30E9-4168-81FF-61B555F0DF29/IosApp1.app/libSystem.Native.dylib
0x11f359000 - 0x11f364fff libsystem_pthread.dylib (*) <bc574849-1aae-31e7-b350-916dda999d97> /usr/lib/system/libsystem_pthread.dylib
0x10d967000 - 0x10de1efff libmonosgen-2.0.dylib (*) <5344b178-6c90-3cd7-b92c-8f228acb48d2> /Users/USER/Library/Developer/CoreSimulator/Devices/02F1B274-3BDC-471F-9304-EC96459FB2BC/data/Containers/Bundle/Application/8F088341-30E9-4168-81FF-61B555F0DF29/IosApp1.app/libmonosgen-2.0.dylib
0x11f2ba000 - 0x11f2f1fff libsystem_kernel.dylib (*) <61711d11-e776-3bc3-b9a2-6f9f37cb8499> /usr/lib/system/libsystem_kernel.dylib
0x129371000 - 0x12abfffff com.apple.UIKitCore (1.0) <f710b655-42ee-3939-a3bd-6da0f3758758> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore
0x11dacb000 - 0x11db11fff libdispatch.dylib (*) <a1e15d82-e95a-30ec-832e-288d5d2c9a5f> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libdispatch.dylib
0x11f395000 - 0x11f3c8fff libxpc.dylib (*) <a18dc746-2134-3b7b-9103-15acc4b258cc> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libxpc.dylib
0x11e8d5000 - 0x11e907fff libobjc.A.dylib (*) <791e787b-f11e-36d6-925b-5c10df76d693> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libobjc.A.dylib
0x10d3b1000 - 0x10d400fff libxamarin-dotnet-debug.dylib (*) <e3065f66-c845-3342-a987-aa5cc8da624a> /Users/USER/Library/Developer/CoreSimulator/Devices/02F1B274-3BDC-471F-9304-EC96459FB2BC/data/Containers/Bundle/Application/8F088341-30E9-4168-81FF-61B555F0DF29/IosApp1.app/libxamarin-dotnet-debug.dylib
0x120283000 - 0x12031ffff com.apple.FrontBoardServices (765.10) <c6d4c356-5fae-3e2c-b71c-d3e0175ea504> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/FrontBoardServices.framework/FrontBoardServices
0x1207c9000 - 0x1207d1fff com.apple.GraphicsServices (1.0) <d645c3c0-b4f8-31d0-bada-02aea61681d5> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices
0x104413000 - 0x1044fafff com.companyname.IosApp1 (1.0) <9ea51796-b474-309b-a99d-38a0614ca8df> /Users/USER/Library/Developer/CoreSimulator/Devices/02F1B274-3BDC-471F-9304-EC96459FB2BC/data/Containers/Bundle/Application/8F088341-30E9-4168-81FF-61B555F0DF29/IosApp1.app/IosApp1
0x10cfcb000 - 0x10d018fff dyld_sim (*) <7276a69b-e3b9-3f23-957f-061350a501b4> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/dyld_sim
0x20490d000 - 0x204978fff dyld (*) <b70ce1ec-b902-3852-8268-05de00bfa8d5> /usr/lib/dyld
Error Formulating Crash Report:
dyld_process_snapshot_get_shared_cache failed
EOF
-----------
Full Report
-----------
{"app_name":"IosApp1","timestamp":"2022-06-11 15:36:48.00 -0700","app_version":"1.0","slice_uuid":"9ea51796-b474-309b-a99d-38a0614ca8df","build_version":"1.0","platform":7,"bundleID":"com.companyname.IosApp1","share_with_app_devs":1,"is_first_party":0,"bug_type":"309","os_version":"macOS 12.4 (21F79)","incident_id":"A43C9AF2-C7F0-4138-8A6F-13803FED9E14","name":"IosApp1"}
{
"uptime" : 83000,
"procLaunch" : "2022-06-11 15:36:39.7411 -0700",
"procRole" : "Foreground",
"version" : 2,
"userID" : 501,
"deployVersion" : 210,
"modelCode" : "MacBookPro18,1",
"procStartAbsTime" : 2011719147838,
"coalitionID" : 9251,
"osVersion" : {
"train" : "macOS 12.4",
"build" : "21F79",
"releaseType" : "User"
},
"captureTime" : "2022-06-11 15:36:42.3685 -0700",
"incident" : "A43C9AF2-C7F0-4138-8A6F-13803FED9E14",
"bug_type" : "309",
"pid" : 88916,
"procExitAbsTime" : 2011782157779,
"translated" : true,
"cpuType" : "X86-64",
"procName" : "IosApp1",
"procPath" : "\/Users\/USER\/Library\/Developer\/CoreSimulator\/Devices\/02F1B274-3BDC-471F-9304-EC96459FB2BC\/data\/Containers\/Bundle\/Application\/8F088341-30E9-4168-81FF-61B555F0DF29\/IosApp1.app\/IosApp1",
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I think this is similar to the issues reported in #12040 and #14796, but I'm not certain. Is there any workaround? If not, I don't think should wait for .NET 7.
A potential workaround would be to add event handlers to the Runtime.MarshalManagedException and Runtime.MarshalObjectiveCException events and handle those as you handle AppDomain.CurrentDomain.UnhandledException.
Ref: https://docs.microsoft.com/en-us/xamarin/ios/platform/exception-marshaling#events
Thanks. After testing with those, I find that by default the same thing happens there as well. MarshalManagedException fires thousands of times. MarshalObjectiveCException never fires.
However, if I set the ExceptionMode to UnwindNativeCode in MarshalManagedException, then things start looking more like I expect them to.
AppDomain.CurrentDomain.UnhandledException += (sender, args) =>
{
Console.WriteLine("In UnhandledException Handler");
};
AppDomain.CurrentDomain.FirstChanceException += (sender, args) =>
{
Console.WriteLine("In FirstChanceException Handler");
};
ObjCRuntime.Runtime.MarshalManagedException += (sender, args) =>
{
Console.WriteLine("In MarshalManagedException Handler");
args.ExceptionMode = ObjCRuntime.MarshalManagedExceptionMode.UnwindNativeCode;
};
ObjCRuntime.Runtime.MarshalObjectiveCException += (sender, args) =>
{
Console.WriteLine("In MarshalObjectiveCException Handler");
};
throw new Exception("Test Exception");
My debug output now includes the following:
2022-06-13 10:31:30.161041-0700 IosApp1[48797:2241605] In FirstChanceException Handler
2022-06-13 10:31:30.163774-0700 IosApp1[48797:2241605] In MarshalManagedException Handler
2022-06-13 10:31:30.166228-0700 IosApp1[48797:2241605] In FirstChanceException Handler
2022-06-13 10:31:30.166646-0700 IosApp1[48797:2241605] In FirstChanceException Handler
2022-06-13 10:31:30.167401-0700 IosApp1[48797:2241605] In UnhandledException Handler
2022-06-13 10:31:30.226152-0700 IosApp1[48797:2241605] Unhandled managed exception: Test Exception (System.Exception)
at IosApp1.AppDelegate.FinishedLaunching(UIApplication application, NSDictionary launchOptions) in /Users/matt/Code/IosApp1/AppDelegate.cs:line 51
So it seems I can workaround the issue for now by using MarshalManagedException to change the exception mode to UnwindNativeCode, and then just using AppDomain.CurrentDomain.UnhandledException as normal. Does that sound right to you?
I am a bit confused why this works though. The doc you pointed at says:
Default: The default varies by platform. It's alwaysThrowObjectiveCExceptionin .NET. For legacy Xamarin projects, it'sThrowObjectiveCExceptionif the GC is in cooperative mode (watchOS), andUnwindNativeCodeotherwise (iOS / watchOS / macOS). The default may change in the future.UnwindNativeCode: This is the previous (undefined) behavior. This isn't available when using the GC in cooperative mode (which is the only option on watchOS; thus, this isn't a valid option on watchOS), nor when using CoreCLR, but it's the default option for all other platforms in legacy Xamarin projects.
So, why does setting UnwindNativeCode in an iOS project change anything, when the docs say that's the default mode for iOS? Could it be because I'm running in a simulator?
So, why does setting
UnwindNativeCodein an iOS project change anything, when the docs say that's the default mode for iOS? Could it be because I'm running in a simulator?
We changed the default in .NET, and that page hasn't been updated yet:
https://github.com/xamarin/xamarin-macios/wiki/.NET-release-notes-Xcode-13.3#exception-marshalling-is-enabled-by-default
So it seems I can workaround the issue for now by using
MarshalManagedExceptionto change the exception mode toUnwindNativeCode, and then just usingAppDomain.CurrentDomain.UnhandledExceptionas normal. Does that sound right to you?
Yes, I think that should work fine.
Confirming that the same problem exists for macOS applications, and that setting the exception mode to Unwind doesn't seem to make AppDomain.CurrentDomain.UnhandledException trigger. Currently using the workaround described by @rolfbjarne (just putting my custom exception logging code in MarshalManagedException and MarshalObjectiveCException).
I think the comments in this file also have to be updated to reflect what is now the default: https://github.com/xamarin/xamarin-macios/blob/main/src/ObjCRuntime/ExceptionMode.cs
A potential workaround would be to add event handlers to the
Runtime.MarshalManagedExceptionandRuntime.MarshalObjectiveCExceptionevents and handle those as you handleAppDomain.CurrentDomain.UnhandledException.Ref: https://docs.microsoft.com/en-us/xamarin/ios/platform/exception-marshaling#events
@rolfbjarne Does this workaround apply to Xamarin.iOS as well? It seems that Runtime.MarshalManagedException, Runtime.MarshalObjectiveCException and AppDomain.CurrentDomain.UnhandledException don't trigger at all in Release mode in Xamarin.iOS unless --interpreter=all is set. Unfortunately, enabling the interpreter in Xamarin.iOS for us is a huge performance hit.
A potential workaround would be to add event handlers to the
Runtime.MarshalManagedExceptionandRuntime.MarshalObjectiveCExceptionevents and handle those as you handleAppDomain.CurrentDomain.UnhandledException. Ref: docs.microsoft.com/en-us/xamarin/ios/platform/exception-marshaling#events@rolfbjarne Does this workaround apply to Xamarin.iOS as well? It seems that Runtime.MarshalManagedException, Runtime.MarshalObjectiveCException and AppDomain.CurrentDomain.UnhandledException don't trigger at all in Release mode in Xamarin.iOS unless --interpreter=all is set. Unfortunately, enabling the interpreter in Xamarin.iOS for us is a huge performance hit.
Yes, but you must explicitly enable exception marshalling (we turned it on by default in .NET).
You can do that by adding this to the additional mtouch arguments in the project's iOS Build options (this is the MtouchExtraArgs property in the csproj).
--marshal-managed-exceptions=throwobjectivecexception --marshal-objectivec-exceptions=throwmanagedexception
Has this issue been resolved in .NET 7?
Confirming that the same problem exists for macOS applications, and that setting the exception mode to Unwind doesn't seem to make
AppDomain.CurrentDomain.UnhandledExceptiontrigger. Currently using the workaround described by @rolfbjarne (just putting my custom exception logging code inMarshalManagedExceptionandMarshalObjectiveCException).
For a .NET 7 macOS application, it looks like the AppDomain.UnhandledException is not triggered at all. I tested it by throwing a managed exception on the main thread. I can see that the Runtime.MarshalManagedException is fired, but then setting the ExceptionMode to UnwindNativeCode doesn't fire the UnhandledException either, it just crashes the app.
A few updates:
The log shows that the
FirstChanceExceptionhandler fires over 1000 times
This has been fixed (9b8869b2210068bdfce38e9a2f88ed40e69fed2d).
In my test case, FirstChanceException is printed four times:
- The initial throw statement.
- We catch this initial exception on the managed-to-native boundary, and convert it into an Objective-C exception. During this conversion process, there are 2 exceptions internal to the runtime (trying to look up resource assemblies that don't exist - these exceptions are benign and would go unnoticed except in
FirstChanceException). - We've thrown the Objective-C exception, but there are no Objective-C exception handlers. The code flow goes into the unhandled Objective-C exception handler - where we convert the Objective-C exception to a managed exception and throw that.
We can probably fix the fourth, but we likely won't be able to fix the second and third.
The
UnhandledExceptionhandler never fires.
This is not fixed. In fact there doesn't seem to be a way for us to call this handler, the managed runtime does it automatically during exception handler. Unfortunately we're somewhat exceptional, so the existing logic in the managed runtime doesn't work for us.
I've filed https://github.com/dotnet/runtime/issues/102730 to see if we can find a way to raise the UnhandledException event.
The problem with the UnhandledException event not being raised has been fixed when using MonoVM (this means on iOS, Mac Catalyst and tvOS, as long as you're not using NativeAOT). It's still a problem when using CoreCLR (on macOS or when using NativeAOT).
The problem with the
UnhandledExceptionevent not being raised has been fixed when using MonoVM (this means on iOS, Mac Catalyst and tvOS, as long as you're not using NativeAOT). It's still a problem when using CoreCLR (on macOS or when using NativeAOT).
It has been "fixed", but it looks like you won't be releasing the fix until .NET 10. @rolfbjarne Is that correct?
The problem with the
UnhandledExceptionevent not being raised has been fixed when using MonoVM (this means on iOS, Mac Catalyst and tvOS, as long as you're not using NativeAOT). It's still a problem when using CoreCLR (on macOS or when using NativeAOT).It has been "fixed", but it looks like you won't be releasing the fix until .NET 10. @rolfbjarne Is that correct?
No, the fixes that have been implemented so far are all in .NET 9 already.
The .NET 10 milestone is for the remaining issues.
@rolfbjarne , are you sure? Because I'm using .net 9 and MAUI 9.0.12 and I can't get my iOS project to fire AppDomain.CurrentDomain.UnhandledException at all (with a deliberately-caused exception in MAUI/C# code). It works just fine in my Android project.
Also, the MarshalManagedException handler never gets called.
@rolfbjarne More info: I am setting a MarshalManagedException event handler at app startup time:
ObjCRuntime.Runtime.MarshalManagedException+=(sender, args) =>
{
args.ExceptionMode=ObjCRuntime.MarshalManagedExceptionMode.UnwindNativeCode;
};
and I can see this event handler being assigned (debugger breakpoint), but the event never fires. This is the case both in an iOS simulator and on an actual device.
I am also setting an UnhandledException event handler:
AppDomain.CurrentDomain.UnhandledException+=CurrentDomainOnUnhandledException;
void CurrentDomainOnUnhandledException(object sender, UnhandledExceptionEventArgs unhandledExceptionEventArgs)
{
LogUnhandledException(new Exception("CurrentDomainOnUnhandledException",(Exception)unhandledExceptionEventArgs.ExceptionObject));
}
And I can see that event being fired on the iOS simulator, but it never fires on the physical device (iPad attached to my Windows machine via USB cable, and deploying the app to my device which is listed under "iOS Local Devices").
@bitshftr with this project: https://github.com/rolfbjarne/maui-exceptions
I get this output:
- simulator: https://gist.github.com/rolfbjarne/365c516a257a1522959e5e34b97ce5d6
- device: https://gist.github.com/rolfbjarne/20fbc4321d5f36cd1bcbd1b12f4028d3
Can you try that project and see what you get?
Simulator: The only significant difference I see in my log vs. yours is that I have a System.Exception: 'Hexception' line right before the UnhandledException line.
Device: My log is significantly different from your log. Here's mine:
Sender: System.Object
Args.Exception: System.Exception
[0:] An error occurred: 'Hexception'. Callstack: ' at maui.MainPage.OnCounterClicked(Object sender, EventArgs e) in C:\maui-exceptions-main\MainPage.xaml.cs:line 23 at Microsoft.Maui.Controls.Button.Microsoft.Maui.Controls.Internals.IButtonElement.PropagateUpClicked() at Microsoft.Maui.Controls.ButtonElement.ElementClicked(VisualElement visualElement, IButtonElement ButtonElementManager) at Microsoft.Maui.Controls.Button.SendClicked() at Microsoft.Maui.Controls.Button.Microsoft.Maui.IButton.Clicked() at Microsoft.Maui.Handlers.ButtonHandler.ButtonEventProxy.OnButtonTouchUpInside(Object sender, EventArgs e) at UIKit.UIControlEventProxy.Activated() in /Users/builder/azdo/_work/5/s/xamarin-macios/src/UIKit/UIControl.cs:line 41 at UIKit.UIApplication.UIApplicationMain(Int32 argc, String[] argv, IntPtr principalClassName, IntPtr delegateClassName) in /Users/builder/azdo/_work/5/s/xamarin-macios/src/UIKit/UIApplication.cs:line 61 at UIKit.UIApplication.Main(String[] args, Type principalClass, Type delegateClass) in /Users/builder/azdo/_work/5/s/xamarin-macios/src/UIKit/UIApplication.cs:line 96 at maui.Program.Main(String[] args) in C:\maui-exceptions-main\Platforms\iOS\Program.cs:line 40 at System.Object.InvokeStub_Program.Main(Object , Span`1 ) at System.Reflection.MethodBaseInvoker.InvokeWithOneArg(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)' Args: System.Runtime.ExceptionServices.FirstChanceExceptionEventArgs
Args.Exception: System.Reflection.TargetInvocationExceptionFirstChanceException Sender: System.Object
Args: System.Runtime.ExceptionServices.FirstChanceExceptionEventArgs Sender: System.Object Args: System.Runtime.ExceptionServices.FirstChanceExceptionEventArgs Args.Exception: System.ExceptionFirstChanceException
FirstChanceException
The app has been terminated.
That's all that's in my log. And notice that some of the lines are out of order vs. they way your code is arranged. (and I don't know why some of those lines above are treated like code and some aren't...weird git formatting)
@rolfbjarne Any idea why my device logs show that none of the event handlers are firing, except for FirstChanceException?
@rolfbjarne Any idea why my device logs show that none of the event handlers are firing, except for FirstChanceException?
Are you connected to a remote mac where the iOS device is connected? If not, can you try that and see if you get a different behavior?
Heres's my setup (that generated the above logs):
- iPad attached to my Windows machine via USB cable.
- Build Configuration: Debug
- Deploying the app to my device which is listed under "iOS Local Devices".
When I publish the app to TestFlight with the Release build configuration, the UnhandledException handler fires as expected. But of course, I can't debug like that.
When I try the build from my Windows machine, to the iPad connected to a remote Mac (which is located down the hall from my office) via USB, as a "Remote Device", in Debug mode: I get a log similar to your "device" log.
So it appears the only issue is when building on a Windows machine to a Local Device. Which is, of course, the only way I have to debug on a device interactively.
Heres's my setup (that generated the above logs):
- iPad attached to my Windows machine via USB cable.
- Build Configuration: Debug
- Deploying the app to my device which is listed under "iOS Local Devices".
When I publish the app to TestFlight with the Release build configuration, the UnhandledException handler fires as expected. But of course, I can't debug like that.
When I try the build from my Windows machine, to the iPad connected to a remote Mac (which is located down the hall from my office) via USB, as a "Remote Device", in Debug mode: I get a log similar to your "device" log.
So it appears the only issue is when building on a Windows machine to a Local Device. Which is, of course, the only way I have to debug on a device interactively.
Thanks for checking this, I'll have a look and see what I can do.
In net9.0, I'm seeing Runtime.MarshalManagedException firing even when compiling applications AOT (so running on the CLR runtime). So this appears to be an alternative workaround to AppDomain.Current.UnhandledException not firing.
One small drawback is that there's no equivalent of UnhandledExceptionEventArgs.IsTerminating on the MarshalManagedExceptionEventArgs... so it's hard to tell whether the exception is terminal or not.
@rolfbjarne do you know if there are situations in which MarshalManagedException fires but the application doesn't terminate? From my testing, whenever exceptions are wrapped in a try..catch the MarshalManagedException doesn't fire (which is good, that's why it's a good substitute for UnhandledException). I'm guessing maybe unhandled exceptions on background threads?
One small drawback is that there's no equivalent of
UnhandledExceptionEventArgs.IsTerminatingon theMarshalManagedExceptionEventArgs... so it's hard to tell whether the exception is terminal or not.
@rolfbjarne do you know if there are situations in which
MarshalManagedExceptionfires but the application doesn't terminate? From my testing, whenever exceptions are wrapped in atry..catchtheMarshalManagedExceptiondoesn't fire (which is good, that's why it's a good substitute forUnhandledException). I'm guessing maybe unhandled exceptions on background threads?
If the managed exception is converted into an Objective-C exception (the default behavior), then the app will terminate if there's no Objective-C exception handler further up the stack.
This is why there's no IsTerminating value: we don't know whether there's an Objective-C exception handler further up the stack (and figuring it out is rather complicated and not something we'd want to even try to do).
I think the best way to handle this is to consider all marshalled managed exceptions as bad, and should be avoided if at all possible.
I think the best way to handle this is to consider all marshalled managed exceptions as bad, and should be avoided if at all possible.
Exactly the kind of thing the Sentry SDK is interested in!
Thanks @rolfbjarne 🙏🏻
any progress on this issue ?
We're depending on the .NET runtime fixing/implementing a solution for https://github.com/dotnet/runtime/issues/102730.
The remaining issue (AppDomain.UnhandledException on CoreCLR) will be fixed in .NET 10 preview 5, so I'm closing this.