CreateSocket.CtorAndAccept_SocketNotKeptAliveViaInheritance failures with various reasons

[antonfirsov]

The cases of System.Net.Sockets.Tests.CreateSocket.CtorAndAccept_SocketNotKeptAliveViaInheritance(validateClientOuter, acceptApiOuter) have failed 6 times in the last 60 days in different configurations for different reasons. I think the root causes also differ.

validateClientOuter	acceptApiOuter	Queue	Error	Number of failures	Note
*	*	sles.15.amd64.open	System.IO.FileNotFoundException: Could not load file or assembly System.Runtime.CompilerServices.Unsafe	3	Unrelated type load issue
True	0	ubuntu.1604.amd64.open	Remote Executor timeout	1	Happened on 2020-07-30
True	0	osx.1014.amd64.open	Remote Executor timeout	1	Might be related to #41508
False	1	osx.1013.amd64.open	Xunit.Sdk.FalseException: Assert.False() Failure	1

Regarding the Remote Executor timeout case which might be related to #41508, my suggestion is to wait for further occurrences.

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[karelz]

Triage: Started failing before the big PR in Sockets - so likely not a product regression, or anything serious for 5.0.

[antonfirsov]

No new failures since 2020-09-02. If it doesn't happen again we can close.

[antonfirsov]

The issue seems to be gone.