WebSocket exception with LLVM and full AOT Enabled in .NET Android App

[kcrg]

Android framework version

net8.0-android, net9.0-android

Affected platform version

VS 17.11 Preview and 17.10 Stable, .NET 8.0.6 and .NET 9.0.0-preview.5.24306.8

Description

I am encountering an issue with WebSocket functionality in a .NET Android application when LLVM and full AOT is enabled. The application fails to establish WebSocket connections.

Configuration:

<PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|net8.0-android|AnyCPU'">
  <EnableLLVM>True</EnableLLVM>
  <AndroidEnableProfiledAot>False</AndroidEnableProfiledAot>
  <RunAOTCompilation>True</RunAOTCompilation>
</PropertyGroup>

When running the application with the above configuration, WebSocket connections throws exception. The same code works without issues when LLVM is disabled.

Expected Behavior:
The WebSocket connection should be established, messages should be sent and received without errors, and the connection should be properly closed.

Actual Behavior:
WebSocket connection throws exception when LLVM is enabled with the above configuration.

Stack Trace:

Message: net_webstatus_ConnectFailure
StackTrace: at System.Net.WebSockets.WebSocketHandle.ConnectAsync(Uri , HttpMessageInvoker , CancellationToken , ClientWebSocketOptions )
   at System.Net.WebSockets.ClientWebSocket.ConnectAsyncCore(Uri , HttpMessageInvoker , CancellationToken )
   at WebsocketLLVMIssue.WebSocketClient.ConnectAsync(String uri)
   at WebsocketLLVMIssue.MainActivity.ConnectAsync()

Additional Notes:

• Disabling LLVM resolves the issue, indicating a potential conflict between WebSocket operations and LLVM optimizations.
• A repro project is attached to this issue for further investigation.

Steps to Reproduce

1. Create a new .NET Android project.
2. Implement WebSocket client functionality.
3. Add UI elements for connecting, sending messages, and disconnecting.
4. Handle user interactions to manage WebSocket operations.
5. Configure the project to use LLVM without AOT.
6. Build and run the project on an Android device or emulator.
7. Observe the behavior when trying to connect using WebSocket.

Or download this minimal project: WebsocketLLVMIssue.zip

Did you find any workaround?

nope

Relevant log output

logcat.txt

[grendello]

@kcrg Could you please collect more info for us by issuing the following commands from the VS Developer Prompt:

> adb shell setprop debug.mono.log default,assembly,mono_log_level=debug,mono_log_mask=all
> adb logcat -G 65M
> adb logcat -c
rem Start the crashing application here, wait for it to crash, then wait 5 more seconds and...
> adb logcat -d > logcat.txt

Then attach the resulting logcat.txt file to this issue, thanks!

[kcrg]

@grendello Done, I just added the logcat.txt to the issue.
I had problem with adb shell debug.mono.log default,assembly,mono_log_level=debug,mono_log_mask=all
it returns /system/bin/sh: debug.mono.log: inaccessible or not found

Issue occures only in Release. Enabling AOT and LLVM in Debug mode seems wrong.

[grendello]

@grendello Done, I just added the logcat.txt to the issue. I had problem with adb shell debug.mono.log default,assembly,mono_log_level=debug,mono_log_mask=all it returns /system/bin/sh: debug.mono.log: inaccessible or not found

Oops, my bad, sorry about that. The first command should be:

> adb shell setprop debug.mono.log default,assembly,mono_log_level=debug,mono_log_mask=all

And please attach logcat.txt directly here, to your next comment, thanks!

[kcrg]

@grendello Here it is: logcat.txt

[grendello]

@kcrg it looks like a runtime issue, I can't find anything that's specific to .NET for Android. @steveisok I don't have permissions to transfer this to dotnet/runtime, would you mind doing that and assigning somebody to take a look at this? Thanks!

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/ncl
See info in area-owners.md if you want to be subscribed.

[vitek-karas]

Looking into the log, this seems network related:

07-08 15:32:19.972  1492  5110 D VpnManagerService: Exception: java.lang.NullPointerException: Attempt to invoke interface method 'int com.samsung.android.knox.zt.networktrust.filter.IKnoxNetworkFilterService.getKnoxNwFilterHttpProxyPort(int, java.lang.String)' on a null object reference
07-08 15:32:19.972  1492  5110 D VpnManagerService: 	at com.android.server.VpnManagerService.getKnoxNwFilterHttpProxyPort(VpnManagerService.java:1945)
07-08 15:32:19.972  1492  5110 D VpnManagerService: 	at android.net.IVpnManager$Stub.onTransact(IVpnManager.java:1075)
07-08 15:32:19.972  1492  5110 D VpnManagerService: 	at android.os.Binder.execTransactInternal(Binder.java:1375)
07-08 15:32:19.972  1492  5110 D VpnManagerService: 	at android.os.Binder.execTransact(Binder.java:1311)

@simonrozsival could you please take a quick look if this is something we've seen before or it's new...

[grendello]

@vitek-karas @simonrozsival that exception is a red herring, it comes from a different (system) process. The one that is relevant is the following:

07-08 15:32:19.814 15061 15061 D AndroidRuntime: Shutting down VM
--------- beginning of crash
07-08 15:32:19.814 15061 15061 E AndroidRuntime: FATAL EXCEPTION: main
07-08 15:32:19.814 15061 15061 E AndroidRuntime: Process: com.companyname.WebsocketLLVMIssue, PID: 15061
07-08 15:32:19.814 15061 15061 E AndroidRuntime: android.runtime.JavaProxyThrowable: [System.Net.WebSockets.WebSocketException]: net_webstatus_ConnectFailure
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at System.Net.WebSockets.WebSocketHandle+<ConnectAsync>d__22.MoveNext(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at System.Net.WebSockets.ClientWebSocket+<ConnectAsyncCore>d__21.MoveNext(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at WebsocketLLVMIssue.WebSocketClient+<ConnectAsync>d__4.MoveNext(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at WebsocketLLVMIssue.MainActivity+<ConnectAsync>d__5.MoveNext(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at WebsocketLLVMIssue.MainActivity+<<OnCreate>b__4_0>d.MoveNext(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at System.Threading.Tasks.Task+<>c.<ThrowAsync>b__128_0(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at Android.App.SyncContext+<>c__DisplayClass2_0.<Post>b__0(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at Java.Lang.Thread+RunnableImplementor.Run(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at Java.Lang.IRunnableInvoker.n_Run(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PP_V(Unknown Source:0)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at mono.java.lang.RunnableImplementor.n_run(Native Method)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at mono.java.lang.RunnableImplementor.run(RunnableImplementor.java:31)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at android.os.Handler.handleCallback(Handler.java:958)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at android.os.Handler.dispatchMessage(Handler.java:99)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at android.os.Looper.loopOnce(Looper.java:230)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at android.os.Looper.loop(Looper.java:319)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at android.app.ActivityThread.main(ActivityThread.java:8919)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at java.lang.reflect.Method.invoke(Native Method)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:578)
07-08 15:32:19.814 15061 15061 E AndroidRuntime:        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103)
...
07-08 15:32:19.818 15061 15061 I MonoDroid: Android.Runtime.JavaProxyThrowable: Exception_WasThrown, Android.Runtime.JavaProxyThrowable
07-08 15:32:19.818 15061 15061 I MonoDroid: 
07-08 15:32:19.818 15061 15061 I MonoDroid:   --- End of managed Android.Runtime.JavaProxyThrowable stack trace ---
07-08 15:32:19.818 15061 15061 I MonoDroid: android.runtime.JavaProxyThrowable: [System.Net.WebSockets.WebSocketException]: net_webstatus_ConnectFailure
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Net.WebSockets.WebSocketHandle+<ConnectAsync>d__22.MoveNext(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Net.WebSockets.ClientWebSocket+<ConnectAsyncCore>d__21.MoveNext(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at WebsocketLLVMIssue.WebSocketClient+<ConnectAsync>d__4.MoveNext(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at WebsocketLLVMIssue.MainActivity+<ConnectAsync>d__5.MoveNext(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at WebsocketLLVMIssue.MainActivity+<<OnCreate>b__4_0>d.MoveNext(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Threading.Tasks.Task+<>c.<ThrowAsync>b__128_0(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at Android.App.SyncContext+<>c__DisplayClass2_0.<Post>b__0(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at Java.Lang.Thread+RunnableImplementor.Run(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at Java.Lang.IRunnableInvoker.n_Run(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PP_V(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at mono.java.lang.RunnableImplementor.n_run(Native Method)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at mono.java.lang.RunnableImplementor.run(RunnableImplementor.java:31)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at android.os.Handler.handleCallback(Handler.java:958)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at android.os.Handler.dispatchMessage(Handler.java:99)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at android.os.Looper.loopOnce(Looper.java:230)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at android.os.Looper.loop(Looper.java:319)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at android.app.ActivityThread.main(ActivityThread.java:8919)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at java.lang.reflect.Method.invoke(Native Method)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:578)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103)
07-08 15:32:19.818 15061 15061 I MonoDroid: 
07-08 15:32:19.818 15061 15061 I MonoDroid:   --- End of managed Android.Runtime.JavaProxyThrowable stack trace ---
07-08 15:32:19.818 15061 15061 I MonoDroid: android.runtime.JavaProxyThrowable: [System.Net.WebSockets.WebSocketException]: net_webstatus_ConnectFailure
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Net.WebSockets.WebSocketHandle+<ConnectAsync>d__22.MoveNext(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Net.WebSockets.ClientWebSocket+<ConnectAsyncCore>d__21.MoveNext(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at WebsocketLLVMIssue.WebSocketClient+<ConnectAsync>d__4.MoveNext(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at WebsocketLLVMIssue.MainActivity+<ConnectAsync>d__5.MoveNext(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at WebsocketLLVMIssue.MainActivity+<<OnCreate>b__4_0>d.MoveNext(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at System.Threading.Tasks.Task+<>c.<ThrowAsync>b__128_0(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at Android.App.SyncContext+<>c__DisplayClass2_0.<Post>b__0(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at Java.Lang.Thread+RunnableImplementor.Run(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at Java.Lang.IRunnableInvoker.n_Run(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PP_V(Unknown Source:0)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at mono.java.lang.RunnableImplementor.n_run(Native Method)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at mono.java.lang.RunnableImplementor.run(RunnableImplementor.java:31)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at android.os.Handler.handleCallback(Handler.java:958)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at android.os.Handler.dispatchMessage(Handler.java:99)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at android.os.Looper.loopOnce(Looper.java:230)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at android.os.Looper.loop(Looper.java:319)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at android.app.ActivityThread.main(ActivityThread.java:8919)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at java.lang.reflect.Method.invoke(Native Method)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:578)
07-08 15:32:19.818 15061 15061 I MonoDroid:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103)
07-08 15:32:19.818 15061 15061 I MonoDroid: 

It is also related to networking, and the weird thing is that AOT+LLVM somehow makes the connection fail.