Workaround PR: ppy/osu-framework#2088
Context: https://github.com/ppy/osu-framework/blob/master/osu.Framework/MathUtils/Interpolation.cs
Color4: https://github.com/ppy/osuTK/blob/netstandard/src/osuTK/Graphics/Color4.cs
Minimal example of a crash caused when using CreateDelegate with particular generic method signatures, where the selected generic type is osuTK's Color4 struct.
Crashes seem to occur when the method signature has at least two generic arguments and ends in a floating point type. The return type does not seem to make a difference.
Signatures that crash:
(TValue, TValue, double)(TValue, TValue, float)(double, double, double, double, TValue, TValue, double)
Signatures that work:
(TValue)(TValue, double)(TValue, TValue)(TValue, TValue, int)(TValue, TValue, long)(double, TValue)(double, TValue, TValue)(double, double, double, double, TValue, TValue)
Directly calling Reflector<Color4>.Call will not crash, it is only when passing through the Caller<TValue> class.
I have not been able to replicate this issue with any type other than Color4.
Developing on macOS Mojave 10.14 and VS for Mac, Xamarin.iOS 12.2.1.12, testing on a 2017 iPad Pro 10.5" running iOS 11.3.1. iOS 12 and newer versions of Xamarin.iOS exhibit the same behaviour.
2019-01-17 22:04:38.308 CrashTest[2689:10844184] Xamarin.iOS: Skipping assembly registration for CrashTest since it's not needed (dynamic registration is not supported)
2019-01-17 22:04:41.925 CrashTest[2689:10844184] error: * Assertion: should not be reached at ../../../../../mono/mini/mini-arm64-gsharedvt.c:119
2019-01-17 22:04:41.926 CrashTest[2689:10844184] critical: Stacktrace:
2019-01-17 22:04:41.926 CrashTest[2689:10844184] critical: at <unknown> <0xffffffff>
2019-01-17 22:04:41.926 CrashTest[2689:10844184] critical: at CrashTest.AppDelegate.FinishedLaunching (UIKit.UIApplication,Foundation.NSDictionary) [0x00007] in /Users/samah/Projects/CrashTest/CrashTest/AppDelegate.cs:16
2019-01-17 22:04:41.926 CrashTest[2689:10844184] critical: at (wrapper runtime-invoke) object.runtime_invoke_dynamic (intptr,intptr,intptr,intptr) [0x0001e] in <01f05773bcda4d0b9642de54d8f3cec3#F040338C-D1D0-BBB8-2E98-6BF7995BFC45>:0
2019-01-17 22:04:41.927 CrashTest[2689:10844184] critical: at <unknown> <0xffffffff>
2019-01-17 22:04:41.927 CrashTest[2689:10844184] critical: at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <0x00007>
2019-01-17 22:04:41.927 CrashTest[2689:10844184] critical: at UIKit.UIApplication.Main (string[],intptr,intptr) [0x00005] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.2.1.12/src/Xamarin.iOS/UIKit/UIApplication.cs:79
2019-01-17 22:04:41.927 CrashTest[2689:10844184] critical: at UIKit.UIApplication.Main (string[],string,string) [0x0002c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.2.1.12/src/Xamarin.iOS/UIKit/UIApplication.cs:63
2019-01-17 22:04:41.927 CrashTest[2689:10844184] critical: at CrashTest.Application.Main (string[]) [0x00001] in /Users/samah/Projects/CrashTest/CrashTest/Main.cs:12
2019-01-17 22:04:41.928 CrashTest[2689:10844184] critical: at (wrapper runtime-invoke) object.runtime_invoke_dynamic (intptr,intptr,intptr,intptr) [0x0001e] in <01f05773bcda4d0b9642de54d8f3cec3#F040338C-D1D0-BBB8-2E98-6BF7995BFC45>:0
2019-01-17 22:04:41.928 CrashTest[2689:10844184] critical:
Native stacktrace:
2019-01-17 22:04:41.940 CrashTest[2689:10844184] critical: 0 libmonosgen-2.0.dylib 0x0000000103490d18 mono_handle_native_crash + 224
2019-01-17 22:04:41.940 CrashTest[2689:10844184] critical: 1 libsystem_platform.dylib 0x000000018139cb58 _sigtramp + 52
2019-01-17 22:04:41.940 CrashTest[2689:10844184] critical: 2 libsystem_pthread.dylib 0x00000001813a2288 <redacted> + 376
2019-01-17 22:04:41.940 CrashTest[2689:10844184] critical: 3 libsystem_c.dylib 0x000000018116fd0c abort + 140
2019-01-17 22:04:41.941 CrashTest[2689:10844184] critical: 4 libxamarin-debug.dylib 0x0000000100544188 _ZL12log_callbackPKcS0_S0_iPv + 76
2019-01-17 22:04:41.941 CrashTest[2689:10844184] critical: 5 libmonosgen-2.0.dylib 0x000000010344da84 monoeg_g_logv + 100
2019-01-17 22:04:41.941 CrashTest[2689:10844184] critical: 6 libmonosgen-2.0.dylib 0x000000010344dca4 monoeg_assertion_message + 72
2019-01-17 22:04:41.941 CrashTest[2689:10844184] critical: 7 libmonosgen-2.0.dylib 0x0000000103489a68 get_arg_slots + 472
2019-01-17 22:04:41.941 CrashTest[2689:10844184] critical: 8 libmonosgen-2.0.dylib 0x00000001034891b0 mono_arch_get_gsharedvt_call_info + 248
2019-01-17 22:04:41.941 CrashTest[2689:10844184] critical: 9 libmonosgen-2.0.dylib 0x00000001034939e8 mini_get_gsharedvt_wrapper + 216
2019-01-17 22:04:41.941 CrashTest[2689:10844184] critical: 10 libmonosgen-2.0.dylib 0x00000001034a3f58 mini_add_method_trampoline + 408
2019-01-17 22:04:41.941 CrashTest[2689:10844184] critical: 11 libmonosgen-2.0.dylib 0x00000001034a5340 mono_delegate_trampoline + 1064
2019-01-17 22:04:41.941 CrashTest[2689:10844184] critical: 12 libmscorlib.dll.dylib 0x00000001007f712c generic_trampoline_delegate + 252
2019-01-17 22:04:41.941 CrashTest[2689:10844184] critical: 13 libCrashTest.exe.dylib 0x0000000100305370 CrashTest_AppDelegate_FinishedLaunching_UIKit_UIApplication_Foundation_NSDictionary + 384
2019-01-17 22:04:41.942 CrashTest[2689:10844184] critical: 14 libmscorlib.dll.dylib 0x00000001007d94b8 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 248
2019-01-17 22:04:41.942 CrashTest[2689:10844184] critical: 15 libmonosgen-2.0.dylib 0x00000001034a1bb4 mono_jit_runtime_invoke + 904
2019-01-17 22:04:41.942 CrashTest[2689:10844184] critical: 16 libmonosgen-2.0.dylib 0x00000001035279e0 mono_runtime_invoke_checked + 148
2019-01-17 22:04:41.942 CrashTest[2689:10844184] critical: 17 libmonosgen-2.0.dylib 0x000000010352b2f8 mono_runtime_invoke + 84
2019-01-17 22:04:41.942 CrashTest[2689:10844184] critical: 18 CrashTest 0x00000001002e88e0 _ZL30native_to_managed_trampoline_7P11objc_objectP13objc_selectorPP11_MonoMethodP13UIApplicationP12NSDictionaryj + 688
2019-01-17 22:04:41.942 CrashTest[2689:10844184] critical: 19 CrashTest 0x00000001002e8620 -[AppDelegate application:didFinishLaunchingWithOptions:] + 60
2019-01-17 22:04:41.942 CrashTest[2689:10844184] critical: 20 UIKit 0x000000018b34ae38 <redacted> + 408
2019-01-17 22:04:41.942 CrashTest[2689:10844184] critical: 21 UIKit 0x000000018b34a240 <redacted> + 3484
2019-01-17 22:04:41.942 CrashTest[2689:10844184] critical: 22 UIKit 0x000000018b31765c <redacted> + 1680
2019-01-17 22:04:41.942 CrashTest[2689:10844184] critical: 23 UIKit 0x000000018b947a0c <redacted> + 784
2019-01-17 22:04:41.943 CrashTest[2689:10844184] critical: 24 UIKit 0x000000018b316e4c <redacted> + 160
2019-01-17 22:04:41.943 CrashTest[2689:10844184] critical: 25 UIKit 0x000000018b316ce8 <redacted> + 240
2019-01-17 22:04:41.943 CrashTest[2689:10844184] critical: 26 UIKit 0x000000018b315b78 <redacted> + 724
2019-01-17 22:04:41.943 CrashTest[2689:10844184] critical: 27 UIKit 0x000000018bfab72c <redacted> + 296
2019-01-17 22:04:41.943 CrashTest[2689:10844184] critical: 28 UIKit 0x000000018b315268 <redacted> + 432
2019-01-17 22:04:41.943 CrashTest[2689:10844184] critical: 29 UIKit 0x000000018bd909b8 <redacted> + 220
2019-01-17 22:04:41.943 CrashTest[2689:10844184] critical: 30 UIKit 0x000000018bedeae8 _performActionsWithDelayForTransitionContext + 112
2019-01-17 22:04:41.943 CrashTest[2689:10844184] critical: 31 UIKit 0x000000018b314c88 <redacted> + 248
2019-01-17 22:04:41.943 CrashTest[2689:10844184] critical: 32 UIKit 0x000000018b314624 <redacted> + 368
2019-01-17 22:04:41.943 CrashTest[2689:10844184] critical: 33 UIKit 0x000000018b31165c <redacted> + 540
2019-01-17 22:04:41.944 CrashTest[2689:10844184] critical: 34 UIKit 0x000000018b3113ac <redacted> + 364
2019-01-17 22:04:41.944 CrashTest[2689:10844184] critical: 35 FrontBoardServices 0x0000000183f78470 <redacted> + 364
2019-01-17 22:04:41.944 CrashTest[2689:10844184] critical: 36 FrontBoardServices 0x0000000183f80d6c <redacted> + 224
2019-01-17 22:04:41.944 CrashTest[2689:10844184] critical: 37 libdispatch.dylib 0x000000018106cae4 <redacted> + 16
2019-01-17 22:04:41.944 CrashTest[2689:10844184] critical: 38 libdispatch.dylib 0x00000001810741f4 <redacted> + 224
2019-01-17 22:04:41.944 CrashTest[2689:10844184] critical: 39 FrontBoardServices 0x0000000183fac878 <redacted> + 36
2019-01-17 22:04:41.944 CrashTest[2689:10844184] critical: 40 FrontBoardServices 0x0000000183fac51c <redacted> + 404
2019-01-17 22:04:41.944 CrashTest[2689:10844184] critical: 41 FrontBoardServices 0x0000000183facab8 <redacted> + 56
2019-01-17 22:04:41.944 CrashTest[2689:10844184] critical: 42 CoreFoundation 0x0000000181723404 <redacted> + 24
2019-01-17 22:04:41.945 CrashTest[2689:10844184] critical: 43 CoreFoundation 0x0000000181722c2c <redacted> + 276
2019-01-17 22:04:41.945 CrashTest[2689:10844184] critical: 44 CoreFoundation 0x000000018172079c <redacted> + 1204
2019-01-17 22:04:41.945 CrashTest[2689:10844184] critical: 45 CoreFoundation 0x0000000181640da8 CFRunLoopRunSpecific + 552
2019-01-17 22:04:41.945 CrashTest[2689:10844184] critical: 46 GraphicsServices 0x0000000183623020 GSEventRunModal + 100
2019-01-17 22:04:41.945 CrashTest[2689:10844184] critical: 47 UIKit 0x000000018b62178c UIApplicationMain + 236
2019-01-17 22:04:41.945 CrashTest[2689:10844184] critical: 48 libXamarin.iOS.dll.dylib 0x0000000100345b68 wrapper_managed_to_native_UIKit_UIApplication_UIApplicationMain_int_string___intptr_intptr + 328
2019-01-17 22:04:41.945 CrashTest[2689:10844184] critical: 49 libXamarin.iOS.dll.dylib 0x000000010032e30c UIKit_UIApplication_Main_string___intptr_intptr + 44
2019-01-17 22:04:41.945 CrashTest[2689:10844184] critical: 50 libXamarin.iOS.dll.dylib 0x000000010032e2cc UIKit_UIApplication_Main_string___string_string + 172
2019-01-17 22:04:41.945 CrashTest[2689:10844184] critical: 51 libCrashTest.exe.dylib 0x0000000100305010 CrashTest_Application_Main_string__ + 128
2019-01-17 22:04:41.946 CrashTest[2689:10844184] critical: 52 libmscorlib.dll.dylib 0x00000001007d94b8 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 248
2019-01-17 22:04:41.946 CrashTest[2689:10844184] critical: 53 libmonosgen-2.0.dylib 0x00000001034a1bb4 mono_jit_runtime_invoke + 904
2019-01-17 22:04:41.946 CrashTest[2689:10844184] critical: 54 libmonosgen-2.0.dylib 0x00000001035279e0 mono_runtime_invoke_checked + 148
2019-01-17 22:04:41.946 CrashTest[2689:10844184] critical: 55 libmonosgen-2.0.dylib 0x000000010352d8c4 mono_runtime_exec_main_checked + 120
2019-01-17 22:04:41.946 CrashTest[2689:10844184] critical: 56 libmonosgen-2.0.dylib 0x000000010348145c mono_jit_exec + 268
2019-01-17 22:04:41.946 CrashTest[2689:10844184] critical: 57 libxamarin-debug.dylib 0x0000000100554c88 xamarin_main + 2220
2019-01-17 22:04:41.946 CrashTest[2689:10844184] critical: 58 CrashTest 0x00000001002ea334 main + 96
2019-01-17 22:04:41.946 CrashTest[2689:10844184] critical: 59 libdyld.dylib 0x00000001810d1fc0 <redacted> + 4
2019-01-17 22:04:41.946 CrashTest[2689:10844184] critical:
=================================================================
Got a SIGABRT while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================