Hi, I noticed that wfShellExecTest::testT69870() blocked my test job (make the job infinite waiting). I think this place should be a good place to ask this question. I using Windows 10 and PHP 7.2.9 as my development environment, the problem happened on here. But in my Linux system, everything looks good.
For my debug, the process blocked by a fread() function in includes/shell/Command.php on line 475. (note: the function inside foreach, and the process blocked in the second cycle)