Writing random output to console output handle fails with no last error set

[benhillis]

Environment

Windows build number: Microsoft Windows [Version 10.0.19002.1000]

Any other software?
WSL2

Steps to reproduce

microsoft/WSL#4495

1. Install Ubuntu 18.04 distro from store
2. for i in /bin/*; do head ${i}; done
3. Observe wsl window hang or crash

Expected behavior

Contents of the files are displayed, no hang / crash.

Actual behavior

WSL window will close, or hang. Seems like an issue with (or around) Utf8ToWideCharParser::_InvolvedParse.

[jstarks]

Should _InvolvedParse just stop passing MB_ERR_INVALID_CHARS to MultiByteToWideChar?

[benhillis]

@jstarks - that was my naive take, I can try building a private with that change.

[jstarks]

Although there's also a call to _RemoveInvalidSequences before that, which presumably should remove any invalid UTF-8 sequences.