[browser][wasm] Failed trying to read log messages via selenium: OpenQA.Selenium.WebDriverException: An unknown exception was encountered sending an HTTP request to the remote WebDriver server for URL

[carlossanlop]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=734813
Build error leg or test failing: browser-wasm linux Release WasmBuildTests

Error Message

{
  "ErrorMessage" : "OpenQA.Selenium.WebDriverException: An unknown exception was encountered sending an HTTP request to the remote WebDriver server for URL",
  "BuildRetry" : false,
  "ExcludeConsoleLog" : false
}

• PR:[release/8.0] Update dependencies from dotnet/emsdk #104630
• Queue: browser-wasm linux Release WasmBuildTests
• Job result: https://dev.azure.com/dnceng-public/public/_build/results?buildId=734813&view=logs&j=1fa93050-f528-55d3-a351-f8bf9ce5adbf&t=a9f1a437-3b59-5900-1137-ec6cae9a530c&l=142
• Log file: https://helixre107v0xd1eu3ibi6ka.blob.core.windows.net/dotnet-runtime-refs-pull-104630-merge-834dc1579a1b4085ad/Workloads-NoWebcil-Wasm.Build.NativeRebuild.Tests.OptimizationFlagChangeTests/1/console.eacd6a90.log?helixlogtype=result
• Output:

        [wasm test-browser] [19:28:03] dbug: Saving diagnostics data to '/root/helix/work/workitem/e/diagnostics.json'
        [wasm test-browser] [19:28:03] dbug: Failed trying to read log messages via selenium: OpenQA.Selenium.WebDriverException: An unknown exception was encountered sending an HTTP request to the remote WebDriver server for URL http://localhost:41171/session/62eaec63cc2d91f50756098ae8fbfef8/se/log. The exception message was: An error occurred while sending the request.
        [wasm test-browser]                   ---> System.Net.Http.HttpRequestException: An error occurred while sending the request.
        [wasm test-browser]                   ---> System.Net.Http.HttpIOException: The response ended prematurely. (ResponseEnded)
        [wasm test-browser]                     at System.Net.Http.HttpConnection.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
        [wasm test-browser]                     --- End of inner exception stack trace ---
        [wasm test-browser]                     at System.Net.Http.HttpConnection.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
        [wasm test-browser]                     at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)
        [wasm test-browser]                     at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
        [wasm test-browser]                     at System.Net.Http.HttpClient.<SendAsync>g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts, CancellationTokenSource pendingRequestsCts, CancellationToken originalCancellationToken)
        [wasm test-browser]                     at OpenQA.Selenium.Remote.HttpCommandExecutor.MakeHttpRequest(HttpRequestInfo requestInfo)
        [wasm test-browser]                     at OpenQA.Selenium.Remote.HttpCommandExecutor.Execute(Command commandToExecute)
        [wasm test-browser]                     --- End of inner exception stack trace ---
        [wasm test-browser]                     at OpenQA.Selenium.Remote.HttpCommandExecutor.Execute(Command commandToExecute)
        [wasm test-browser]                     at OpenQA.Selenium.Remote.DriverServiceCommandExecutor.Execute(Command commandToExecute)
        [wasm test-browser]                     at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters)
        [wasm test-browser]                     at OpenQA.Selenium.Remote.RemoteWebDriver.InternalExecute(String driverCommandToExecute, Dictionary`2 parameters)
        [wasm test-browser]                     at OpenQA.Selenium.Remote.RemoteLogs.GetLog(String logKind)
        [wasm test-browser]                     at Microsoft.DotNet.XHarness.CLI.Commands.Wasm.WasmBrowserTestRunner.RunSeleniumLogMessagePump(IWebDriver driver, CancellationToken token) in /_/src/Microsoft.DotNet.XHarness.CLI/Commands/WASM/Browser/WasmBrowserTestRunner.cs:line 214

Known issue validation

Build: 🔎
Result validation: ⚠️ Validation could not be done without an Azure DevOps build URL on the issue. Please add it to the "Build: 🔎" line.
Validation performed at: 5/20/2025 1:59:59 PM UTC

Report

Build	Repository	Test	Pull Request
1565945	dotnet/runtime	Wasm.Build.Tests.MainWithArgsTests.NonAsyncMainWithArgs	#132159
1553541	dotnet/runtime	WasmTestOnChrome-CLR-ST-Batch-8.WorkItemExecution	#129634
1551759	dotnet/runtime	WasmTestOnChrome-CLR-ST-Batch-8.WorkItemExecution	#129634
1549996	dotnet/runtime	Wasm.Build.NativeRebuild.Tests.OptimizationFlagChangeTests.OptimizationFlagChange
1548949	dotnet/runtime	Wasm.Build.NativeRebuild.Tests.FlagsChangeRebuildTests.ExtraEmccFlagsSetButNoRealChange	#132159

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	5

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Tagging subscribers to 'arch-wasm': @lewing
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[maraf]

The test succeed with WASM EXIT 42, but selenium WebDriver crashed when reading messages https://github.com/dotnet/xharness/blob/release/8.0/src/Microsoft.DotNet.XHarness.CLI/Commands/WASM/Browser/WasmBrowserTestRunner.cs#L214

[carlossanlop]

I edited the error message as it was too specific. There were some other hits with a shorter message but that seem to have the same root cause:

• 9.0 PR: [release/9.0] Update dependencies from dotnet/emsdk #106878
• Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=786393&view=logs&j=63c2d0c8-fec2-5788-81c8-f3ac95e8841f&t=744baa8c-2e26-50b3-27ca-51a0d84eca60
• Log: https://helixre107v0xd1eu3ibi6ka.blob.core.windows.net/dotnet-runtime-refs-pull-106878-merge-469ebafd1a8446f1ab/WasmTestOnChrome-MT-System.Runtime.Tests/1/console.1dacad35.log?helixlogtype=result
• Output:

[14:15:30] info: System.Reflection.Tests.ReflectionCacheTests 0.0014648 ms
[14:38:15] fail: Tests timed out. Killing driver service pid 78
[14:38:15] fail: Application has finished with exit code TIMED_OUT but 0 was expected
[14:38:15] crit: OpenQA.Selenium.WebDriverException: An unknown exception was encountered sending an HTTP request to the remote WebDriver server for URL http://localhost:40847/session/b0225414b8cc299b715027c225d358f9/window/handles. The exception message was: Connection refused (localhost:40847)
                  ---> System.Net.Http.HttpRequestException: Connection refused (localhost:40847)
                  ---> System.Net.Sockets.SocketException (111): Connection refused
                    at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken)
                    at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.System.Threading.Tasks.Sources.IValueTaskSource.GetResult(Int16 token)
                    at System.Net.Sockets.Socket.<ConnectAsync>g__WaitForConnectWithCancellation|285_0(AwaitableSocketAsyncEventArgs saea, ValueTask connectTask, CancellationToken cancellationToken)
                    at System.Net.Http.HttpConnectionPool.ConnectToTcpHostAsync(String host, Int32 port, HttpRequestMessage initialRequest, Boolean async, CancellationToken cancellationToken)
                    --- End of inner exception stack trace ---
                    at System.Net.Http.HttpConnectionPool.ConnectToTcpHostAsync(String host, Int32 port, HttpRequestMessage initialRequest, Boolean async, CancellationToken cancellationToken)
                    at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
                    at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
                    at System.Net.Http.HttpConnectionPool.InjectNewHttp11ConnectionAsync(QueueItem queueItem)
                    at System.Threading.Tasks.TaskCompletionSourceWithCancellation`1.WaitWithCancellationAsync(CancellationToken cancellationToken)
                    at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)
                    at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
                    at System.Net.Http.HttpClient.<SendAsync>g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts, CancellationTokenSource pendingRequestsCts, CancellationToken originalCancellationToken)
                    at OpenQA.Selenium.Remote.HttpCommandExecutor.MakeHttpRequest(HttpRequestInfo requestInfo)
                    at OpenQA.Selenium.Remote.HttpCommandExecutor.Execute(Command commandToExecute)
                    --- End of inner exception stack trace ---
                    at OpenQA.Selenium.Remote.HttpCommandExecutor.Execute(Command commandToExecute)
                    at OpenQA.Selenium.Remote.DriverServiceCommandExecutor.Execute(Command commandToExecute)
                    at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters)
                    at OpenQA.Selenium.Remote.RemoteWebDriver.get_WindowHandles()
                    at Microsoft.DotNet.XHarness.CLI.Commands.Wasm.WasmTestBrowserCommand.InvokeInternal(ILogger logger) in /_/src/Microsoft.DotNet.XHarness.CLI/Commands/WASM/Browser/WasmTestBrowserCommand.cs:line 108
                    at Microsoft.DotNet.XHarness.CLI.Commands.Wasm.WasmTestBrowserCommand.InvokeInternal(ILogger logger)
                    at Microsoft.DotNet.XHarness.CLI.Commands.XHarnessCommand`1.Invoke(IEnumerable`1 arguments) in /_/src/Microsoft.DotNet.XHarness.CLI/Commands/XHarnessCommand.cs:line 145
XHarness exit code: 71 (GENERAL_FAILURE