[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

--- Comment #11 from dmilith <dmilith at me.com> ---
(In reply to Mark Millard from comment #8)

I have:
- one amd64, 8 cores, 8th gen i7, 64G RAM dedicated machine - my native build
host
- my workstation - also amd64, 8 cores, 3rd gen i7 3370, 32G RAM, (where I do
builds and tests under Vmware Fusion before I try with native build host).
- other 10+ workstations/ servers/ DO instances using system and software I
prepare.


A few more notes:

- Because my workstation uses Ivy Bridge CPU, I do CFLAGS override to be sure
that both my systems and software is compatible with Intel CPUs since 3rd gen.

- My software build script uses ZFS a _lot_ under the hood. Every software
PREFIX is a ZFS dataset that is mounted, filled, unmounted, sent every build.
Every "software build" is an lz4 compressed ZFS dataset sent to a file. ZFS got
a major upgrade in 13, maybe the issue is related?

- I use tmpfs feature a lot. By default, (almost) every build is both ccached
and work in RAMdisk (I'm quite sure the zombie processes issue happens when
invoked from ramdisk that's temporarily mounted under ZFS dataset mount). I
also use LTO caching (if enabled for given software definition). I've been
trying to use all system features I can (just because I can and I get nice
results from it)

- My system build configs are public:
https://github.com/VerKnowSys/svdOS/blob/master/etc/src.conf
https://github.com/VerKnowSys/svdOS/blob/master/etc/make.conf

- I use almost the same scripts (minor changes) for builds since FreeBSD 9.0
(when I started having fun with this stuff) - mostly to get reproducible builds
among OS versions.

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