Android API 23, Runtime Crash in .NET 9

[jonathanpeppers]

Description

We have a nightly test pipeline that runs our test suite on older Android emulators.

The API 23 emulator crashes at runtime with:

08-06 03:33:12.480  2745  2745 F mono-rt : [ERROR] FATAL UNHANDLED EXCEPTION: Nested exception detected.
08-06 03:33:12.480  2745  2745 F mono-rt : Original Exception: at System.Threading.Thread.get_CurrentThread () [0x00009] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.Threading.Monitor.Exit (object) [0x0000e] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.AppContext.GetData (string) [0x00037] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.AppContext.TryGetSwitch (string,bool&) [0x00040] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.AppContextConfigHelper.GetBooleanConfig (string,bool) [0x00000] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.LocalAppContextSwitches.GetDefaultShowILOffsetSetting () [0x00014] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.Diagnostics.StackTrace.ToString (System.Diagnostics.StackTrace/TraceFormat,System.Text.StringBuilder) [0x002ee] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.Diagnostics.StackTrace.ToString (System.Diagnostics.StackTrace/TraceFormat) [0x0000b] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.Exception.GetStackTrace () [0x00007] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.Exception.get_StackTrace () [0x00023] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.Exception.ToString () [0x0001f] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.Exception.ToString () [0x0000c] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.Exception.ToString () [0x0000c] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : 
08-06 03:33:12.480  2745  2745 F mono-rt : Nested exception:at System.Threading.Thread.get_CurrentThread () [0x00009] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.Threading.Monitor.Exit (object) [0x0000e] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.AppContext.GetData (string) [0x00037] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.AppContext.TryGetSwitch (string,bool&) [0x00040] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.AppContextConfigHelper.GetBooleanConfig (string,bool) [0x00000] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.LocalAppContextSwitches.GetDefaultShowILOffsetSetting () [0x00014] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.Diagnostics.StackTrace.ToString (System.Diagnostics.StackTrace/TraceFormat,System.Text.StringBuilder) [0x002ee] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.Diagnostics.StackTrace.ToString (System.Diagnostics.StackTrace/TraceFormat) [0x0000b] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.Exception.GetStackTrace () [0x00007] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.Exception.get_StackTrace () [0x00023] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.Exception.ToString () [0x0001f] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.Exception.ToString () [0x0000c] in <d7679677bb2b4cc291070c60be6bf246>:0
08-06 03:33:12.480  2745  2745 F mono-rt : at System.Exception.ToString () [0x0000c] in <d7679677bb2b4cc291070c60be6bf246>:0

This appears to be working fine on newer API levels.

Reproduction Steps

Run this test project on an API 23 emulator:

• https://github.com/dotnet/android/blob/main/tests/Mono.Android-Tests/Runtime-Microsoft.Android.Sdk/Mono.Android.NET-Tests.csproj

Expected behavior

Our test suite passes on API 23 emulators.

Actual behavior

Our test suite crashes on API 23 emulators.

Regression?

Yes, this is working in .NET 8.

Known Workarounds

n/a

Configuration

Noticed with:

• .NET SDK 9.0.100-rc.1.24381.10
• Runtime 9.0.0-rc.1.24380.7

I think this was also happening in .NET 9 Preview 7 builds.

Other information

logcat-Release23-Mono.Android.NET_Tests.txt

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[akoeplinger]

This looks like two issues in one: it's trying to throw an exception but then crashes because of the nested exception.

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[steveisok]

@jonathanpeppers from the logcat, it appears libSystem.Native could not be loaded. Is there something wrong with your setup?