[Bug 253718] Major issue with zombie processes from standard base system utils

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253718

            Bug ID: 253718
           Summary: Major issue with zombie processes from standard base
                    system utils
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: dmilith at me.com

Since FreeBSD 13-ALPHA I was able to reproduce a very nasty bug. I thought it's
HardenedBSD-related, but today I also reproduced it on vanilla version of
FreeBSD.

The issue happens when I build software using my "Sofin" script (which is just
plain sh script using sed, awk and other base system utilities to automate
software build process). From htop, the issue looks like this:

http://s.verknowsys.com/122c70f4414e3ccd903d34746d8284e8.png

In this case, two processes turn zombie, and build is stuck (here perl build
process hanged on invoking some sed and zsh).
This is how build looks from my script side:
http://s.verknowsys.com/9fe4981b309b381785e0b4c4ab7d0aea.png (this way I know
it's perl in this case, but I had same issues building Qemu and other software
bundles before)

It's a very, very severe bug, (would say critical blocker) which is not that
hard to reproduce.

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