System.InvalidOperationException: Failed to copy test results from simulator to host.

[rmarinho]

Build

https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1234014

Seems this is failing a test, crash and can t report back

[06:39:41] dbug: Process bash exited with 1
[06:39:41] dbug: Failed to copy results file from simulator. Expected at: /tmp/helix/working/AADF09C7/w/B9890A37/uploads/test-ios-simulator-64-20251217_053944.log
[06:39:41] fail: Application run failed:
                 System.InvalidOperationException: Failed to copy test results from simulator to host.
                    at Microsoft.DotNet.XHarness.Apple.AppTester.RunSimulatorTests(AppBundleInformation appInformation, MlaunchArguments mlaunchArguments, ICrashSnapshotReporter crashReporter, ITestReporter testReporter, IResultFileHandler resultFileHandler, ISimpleListener deviceListener, ISimulatorDevice simulator, ISimulatorDevice companionSimulator, TimeSpan timeout, CancellationToken cancellationToken, RunMode runMode) in /_/src/Microsoft.DotNet.XHarness.Apple/AppOperations/AppTester.cs:line 352
                    at Microsoft.DotNet.XHarness.Apple.AppTester.TestApp(AppBundleInformation appInformation, TestTargetOs target, IDevice device, IDevice companionDevice, TimeSpan timeout, TimeSpan testLaunchTimeout, Boolean signalAppEnd, IEnumerable`1 extraAppArguments, IEnumerable`1 extraEnvVariables, XmlResultJargon xmlResultJargon, String[] skippedMethods, String[] skippedTestClasses, CancellationToken cancellationToken) in /_/src/Microsoft.DotNet.XHarness.Apple/AppOperations/AppTester.cs:line 257
                    at Microsoft.DotNet.XHarness.Apple.TestOrchestrator.ExecuteApp(AppBundleInformation appBundleInfo, TestTargetOs target, IDevice device, IDevice companionDevice, TimeSpan timeout, TimeSpan launchTimeout, CommunicationChannel communicationChannel, XmlResultJargon xmlResultJargon, IEnumerable`1 singleMethodFilters, IEnumerable`1 classMethodFilters, IReadOnlyCollection`1 environmentalVariables, IEnumerable`1 passthroughArguments, Boolean signalAppEnd, CancellationToken cancellationToken) in /_/src/Microsoft.DotNet.XHarness.Apple/Orchestration/TestOrchestrator.cs:line 237
                    at Microsoft.DotNet.XHarness.Apple.BaseOrchestrator.OrchestrateOperationInternal(TestTargetOs target, String deviceName, Boolean includeWirelessDevices, Boolean resetSimulator, Boolean enableLldb, GetAppBundleInfoFunc getAppBundle, ExecuteMacCatalystAppFunc executeMacCatalystApp, ExecuteAppFunc executeApp, CancellationToken cancellationToken) in /_/src/Microsoft.DotNet.XHarness.Apple/Orchestration/BaseOrchestrator.cs:line 309

Build leg reported

Microsoft.Maui.Controls.DeviceTests.WorkItemExecution

Pull Request

N/A

Known issue core information

Fill out the known issue JSON section by following the step by step documentation on how to create a known issue

 {
    "ErrorMessage" : " System.InvalidOperationException: Failed to copy test results from simulator to host.",
    "BuildRetry": false,
    "ErrorPattern": "",
    "ExcludeConsoleLog": false
 }

@dotnet/dnceng

Release Note Category

• Feature changes/additions
• Bug fixes
• Internal Infrastructure Improvements

Release Note Description

Additional information about the issue reported

No response

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1234014
Error message validated: [ System.InvalidOperationException: Failed to copy test results from simulator to host.]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 12/17/2025 2:25:13 PM UTC

Report

Build	Definition	Test	Pull Request
1246817	dotnet/maui	Microsoft.Maui.Core.DeviceTests.WorkItemExecution
1246071	dotnet/maui	Microsoft.Maui.Controls.DeviceTests.WorkItemExecution
1246033	dotnet/maui	Microsoft.Maui.Controls.DeviceTests.WorkItemExecution	dotnet/maui#33414
1243768	dotnet/maui	Controls.DeviceTests-Shell.WorkItemExecution	dotnet/maui#33380
1242244	dotnet/maui	Controls.DeviceTests-Shell.WorkItemExecution
1241781	dotnet/maui	Microsoft.Maui.Core.DeviceTests.WorkItemExecution	dotnet/maui#33129
1240752	dotnet/maui	Controls.DeviceTests-CollectionView.WorkItemExecution	dotnet/maui#31755

Summary

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