cross tests fail with System.ComponentModel.Win32Exception (2): No such file or directory

For netstd everything fails with:
 
System.ComponentModel.Win32Exception (2): No such file or directory
   at System.Diagnostics.Process.ForkAndExecProcess(String filename,
String[] argv, String[] envp, String cwd, Boolean redirectStdin, Boolean
redirectStdout, Boolean redirectStderr, Boolean setCredentials, UInt32
userId, UInt32 groupId, UInt32[] groups, Int32& stdinFd, Int32& stdoutFd,
Int32& stderrFd, Boolean usesTerminal, Boolean throwOnNoExec)
   at System.Diagnostics.Process.StartCore(ProcessStartInfo startInfo)
   at System.Diagnostics.Process.Start()
   at Microsoft.DotNet.Cli.Utils.Command.Execute()
   at Microsoft.DotNet.Tools.Run.RunCommand.Execute()
   at Microsoft.DotNet.Tools.Run.RunCommand.Run(String[] args)
   at Microsoft.DotNet.Cli.Program.ProcessArgs(String[] args, ITelemetry
telemetryClient)
   at Microsoft.DotNet.Cli.Program.Main(String[] args)