[Bug 227285] File descriptor passing does not work reliably on SMP system (cache coherency issue?)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227285

--- Comment #4 from Jan Kokemüller <jan.kokemueller at gmail.com> ---
To uncover the bug it helps to run multiple instances at the same time and to
remove the debug output or to pipe it into /dev/null. After a few seconds, at
least some instances should be dead.

I've tested only amd64 for now. I could reproduce it on stock FreeBSD 10/11
systems:


FreeBSD 10.3-RELEASE-p24 FreeBSD 10.3-RELEASE-p24 #0: Wed Nov 15 04:57:40 UTC
2017     root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64
hw.model: Intel(R) Celeron(R) CPU  N3150  @ 1.60GHz


FreeBSD 11.1-RELEASE-p7 FreeBSD 11.1-RELEASE-p7 #0: Tue Mar  6 09:33:30 UTC
2018     root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64
hw.model: Intel(R) Celeron(R) CPU G530 @ 2.40GHz

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