Add tests for FileStream.CopyToAsync

[stephentoub]

Separated out of #11569

[stephentoub]

Test Innerloop Ubuntu14.04 Release Build and Test please (Jenkins aborted tests)

@mmitche, I've seen this happen a few times recently. The build times out after 120 minutes, but when I look at the log, all of the test projects that were running tests finished them, and when I log on to the machine (prior to the timeout and thus prior to Jenkins killing all related processes), I don't see any corerun processes running. That implies the hang is being caused by something other than tests.

[mmitche]

When you logged on the machine, all the processes would have already been killed. When it looks to be hung, you might hop on. My guess is that it is in fact running some sort of corerun process. or maybe msbuild? There is a note about msbuild at the end of the log (it was doing stuff and printed stuff as it was forced to shut down)

[stephentoub]

When you logged on the machine, all the processes would have already been killed. When it looks to be hung, you might hop on.

That's what I did, logged on before it was killed. There were csc and msbuild processes but no corerun.

[mmitche]

12:47:14 /mnt/j/workspace/dotnet_corefx/master/ubuntu14.04_release_prtest/Tools/Microsoft.CSharp.Core.targets(67,5): warning MSB5021: "dotnet" and its child processes are being terminated in order to cancel the build. [/mnt/j/workspace/dotnet_corefx/master/ubuntu14.04_release_prtest/src/System.Text.Encoding.Extensions/tests/System.Text.Encoding.Extensions.Tests.csproj]

[stephentoub]

Thanks, Matt. Is it possible this has to do with the csc compilation server? I wonder if it's hanging waiting for a request to be processed.

[mmitche]

Does that exist on Linux? @jaredpar Any ideas?

[jaredpar]

No. It is not used on Linux at this time.