[prattmic]

I work on gVisor, I can answer this!

gVisor is not a rewritten version of an internal tool. The code you see really does run in production for App Engine and Cloud Run. While there are some internal modifications to better integrate with internal infrastructure, the vast majority of the code is identical to open source, critically including all of the system call handling, filesystem, and memory management code.

While browsing through our issues will show that we still have plenty to work on, the vast majority of applications work well inside gVisor.