[tests] Flaky failures with`Application orchestrator dependency check returned an error: The operation has timed out`

[radical]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=765658
Build error leg or test failing: Aspire.Hosting.Testing.Tests.TestingBuilderTests.SetsCorrectContentRoot(genericEntryPoint: False)
Pull request: #5129

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "Application orchestrator dependency check returned an error: The operation has timed out",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=765658
Error message validated: [Application orchestrator dependency check returned an error: The operation has timed out]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 8/6/2024 4:24:19 AM UTC

Report

Summary

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

[radical]

This is being hit in multiple tests, like Aspire.Hosting.Redis.Tests.RedisFunctionalTests.WithDataBindMountShouldPersistStateBetweenUsages.

[radical]

There doesn't seem to be any output from the dcp-info command. Multiple tests failed in the linked test run.

aspire/src/Aspire.Hosting/Dcp/DcpDependencyCheck.cs

Lines 34 to 36 in 4938cb3

	public async Task<DcpInfo?> GetDcpInfoAsync(CancellationToken cancellationToken = default)
	{
	await _lock.WaitAsync(cancellationToken).ConfigureAwait(false);

Could this be due to the process exiting quickly causing us to miss some output?
I think it would be useful to add some more info to the exception message like the _dcpOptions.DependencyCheckTimeout. Also, cancellationToken is passed to the method so it would be useful to differentiate a timeout due to the token being cancelled, or the timeout being hit.

[radical]

cc @eerhardt @sebastienros @karolz-ms

related - #4640

[karolz-ms]

Is the dependency check timeout set to default value (which is 25 seconds) during test runs?

If so, as a first step I would bump it up to 180 i.e. 3 minutes. This can be done via startup parameters, or, probably more conveniently, via an environment variable https://github.com/dotnet/aspire/blob/main/src/Aspire.Hosting/Dcp/DcpOptions.cs#L155 DOTNET_ASPIRE_DEPENDENCY_CHECK_TIMEOUT. The reason is there is probably a lot going on on the machine when the tests are starting; I have seen very long delays that had to do with AV scanning etc and nothing with the test itself.

If that does not help, we can tweak the dependency check logic further.

[radical]

The timeout bump seems to have helped this. Closing it for now.