UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.62 Safari/537.36

Steps to reproduce the problem:
Isolated Reproduction hasn't been easy. But when running a very large test suite with the following commands:

        '--headless',
        '--disable-dev-shm-usage',
        '--disable-gpu',
        '--disable-software-rasterizer',
        '--mute-audio',
        '--remote-debugging-port=0',
        '--window-size=1440,900',
        '--enable-logging',
        '--v=1',
        '--no-sandbox',
        '--enable-crash-reporting',
        '--crash-dumps-dir=build/outputs/chrome_crash_dumps',

What is the expected behavior?

What went wrong?
We see millions of lines of `[warn] kevent: Invalid argument` during the our test runs:

OS: MacOs 10.13.4 (17E202)
Chrome: Version 67.0.3396.62 (Official Build) (64-bit)

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 67.0.3396.62  Channel: stable
OS Version: OS X 10.13.4
Flash Version: 

I would love to provide a better reproduction, or debug further. But So far have not been succesfull.. Any advice would be appreciated.