Debugger: 'Break all' operation caused 'Debug adapter has terminated' on WSL web Project.

## Environment data
`dotnet --info` output:
VS Code version: 1.10.1
C# Extension version: v1.8.0-beta2(https://github.com/OmniSharp/omnisharp-vscode/releases/tag/v1.8.0-beta2)
OS: Windows 10 Enterprise Insider Preview
Build: 15150.1000.AMD64FRE.RS_ONECORE_BASE_BPT1.170305-1700_CLIENT_ENTERPRISE_EN-US_VL.VHDX
Scenarios: WSL Pipe

## Steps to reproduce
1. Open attached folder with VSCode.
[web.zip](https://github.com/OmniSharp/omnisharp-vscode/files/827336/web.zip)
2. Copy the code from Windows with the command "cp /mnt/c/temp/web/Program.cs ." in "Bash on Ubuntu on Windows" window.
3. Dotnet build.
4. Select 'launch(web)'.
5. Press F5 to start debugging.
6. Press 'Pause' to break all after print loop statements in Debug Console Window.

## Expected behavior
The Cursor hit the loop.

## Actual behavior
Pop up an error message:

## Investigation
1. This issue was unstable, but it occurs frequently in our testing.