[iOSSimulator] Could not launch the simulator application because a miscellaneous error occurred.

[mdh1418]

When running iOSSimulator x64 library tests on #49917, this flakey error appeared on two suites with this build https://dev.azure.com/dnceng/public/_build/results?buildId=1095802&view=logs&j=accacb66-0a14-52ef-4079-6344686d9d4c&t=34fbd35e-866b-51a1-9063-fb50703b1957 build ID c7ff4bc0-70b2-4b2f-982b-9726b20e53b7.

[12:51:20] dbug: 12:51:20.9648570 error HE0018: Could not launch the simulator application: The application “Simulator” could not be launched because a miscellaneous error occurred.
[12:51:20] dbug: 12:51:20.9649900
[12:51:20] dbug: 12:51:20.9718720   at Xamarin.Hosting.SimulatorApplication.LaunchAsync (Xamarin.Hosting.Bindings.SimDevice device) [0x0023c] in <f15836b6453242b9bd6601e287d969a7>:0
[12:51:20] dbug: 12:51:20.9719600   at Xamarin.Hosting.Services.LaunchSimulatorAsync (Xamarin.Hosting.Bindings.SimDevice device) [0x000f3] in <f15836b6453242b9bd6601e287d969a7>:0
[12:51:20] dbug: 12:51:20.9719810   at Xamarin.Launcher.Driver.LaunchSimulatorAsync () [0x00193] in <fd345040cf8646afbcdd85e8867162a4>:0
[12:51:20] dbug: 12:51:20.9719960   at Xamarin.Utils.NSRunLoopExtensions.RunUntilTaskCompletion[T] (Foundation.NSRunLoop this, System.Threading.Tasks.Task`1[TResult] task) [0x00070] in <f15836b6453242b9bd6601e287d969a7>:0
[12:51:20] dbug: 12:51:20.9720180   at Xamarin.Launcher.Driver.Main2 (System.String[] args) [0x00b4d] in <fd345040cf8646afbcdd85e8867162a4>:0
[12:51:20] dbug: 12:51:20.9720310   at Xamarin.Launcher.Driver.Main (System.String[] args) [0x0006d] in <fd345040cf8646afbcdd85e8867162a4>:0
[12:51:20] dbug: 12:51:20.9790610 Process mlaunch exited with 1
[12:51:20] dbug: 12:51:20.9814290 Test run failed
[12:51:20] dbug: 12:51:20.9907180 Could not find pid in mtouch output

System.Runtime.CompilerServices.VisualC.Tests.log
System.Xml.XmlSerializer.Tests.log

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Issue Details

---

When running iOSSimulator x64 library tests on #49917, this flakey error appeared on two suites with this build https://dev.azure.com/dnceng/public/_build/results?buildId=1095802&view=logs&j=accacb66-0a14-52ef-4079-6344686d9d4c&t=34fbd35e-866b-51a1-9063-fb50703b1957 build ID c7ff4bc0-70b2-4b2f-982b-9726b20e53b7.

[12:51:20] dbug: 12:51:20.9648570 error HE0018: Could not launch the simulator application: The application “Simulator” could not be launched because a miscellaneous error occurred.
[12:51:20] dbug: 12:51:20.9649900
[12:51:20] dbug: 12:51:20.9718720   at Xamarin.Hosting.SimulatorApplication.LaunchAsync (Xamarin.Hosting.Bindings.SimDevice device) [0x0023c] in <f15836b6453242b9bd6601e287d969a7>:0
[12:51:20] dbug: 12:51:20.9719600   at Xamarin.Hosting.Services.LaunchSimulatorAsync (Xamarin.Hosting.Bindings.SimDevice device) [0x000f3] in <f15836b6453242b9bd6601e287d969a7>:0
[12:51:20] dbug: 12:51:20.9719810   at Xamarin.Launcher.Driver.LaunchSimulatorAsync () [0x00193] in <fd345040cf8646afbcdd85e8867162a4>:0
[12:51:20] dbug: 12:51:20.9719960   at Xamarin.Utils.NSRunLoopExtensions.RunUntilTaskCompletion[T] (Foundation.NSRunLoop this, System.Threading.Tasks.Task`1[TResult] task) [0x00070] in <f15836b6453242b9bd6601e287d969a7>:0
[12:51:20] dbug: 12:51:20.9720180   at Xamarin.Launcher.Driver.Main2 (System.String[] args) [0x00b4d] in <fd345040cf8646afbcdd85e8867162a4>:0
[12:51:20] dbug: 12:51:20.9720310   at Xamarin.Launcher.Driver.Main (System.String[] args) [0x0006d] in <fd345040cf8646afbcdd85e8867162a4>:0
[12:51:20] dbug: 12:51:20.9790610 Process mlaunch exited with 1
[12:51:20] dbug: 12:51:20.9814290 Test run failed
[12:51:20] dbug: 12:51:20.9907180 Could not find pid in mtouch output

System.Runtime.CompilerServices.VisualC.Tests.log
System.Xml.XmlSerializer.Tests.log

Author:	mdh1418
Assignees:	-
Labels:	area-Infrastructure-mono, os-ios, untriaged
Milestone:	-

[steveisok]

@premun Do you think this might be machine related?

[mdh1418]

Out of all the previous CI runs of #49917 for iOS and tvOS running all the library suites, it seemed to only fail for those two test suites -> a low hit rate.

[premun]

@steveisok both failures are on a single machine (dci-mac-build-139), seems so. I will take it offline and investigate.