[Bug 262348] Unkillable processes during TeX upgrade

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262348

            Bug ID: 262348
           Summary: Unkillable processes during TeX upgrade
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: hubert.tournier@gmail.com

My system gets stuck during TeX upgrade.
When I interrupt portuprade, the only way to kill the related processes is to
reboot. Kill command doesn't do anything. ^Z & kill %1 neither.
Without reboot, the system ends up getting clogged with a lots of processes
(1750+ at last reboot, with periodic tasks)

# kill -9 96945 22652 2745 5974
# ps -aux
USER     PID  %CPU %MEM     VSZ     RSS TT  STAT STARTED       TIME COMMAND
[...]
root   96945   0,7  1,2  506100  406904  0- D+   19:41      2:52,69
/usr/local/sbin/pkg-static register -d -i
/usr/ports/print/texlive-texmf/work/stage -m /usr/ports/print/texlive-tex
[...]
root   22652   0,3  0,0   16936    6384  2- D    20:08      1:59,26 fetch -q
http://update1.freebsd.org/13.0-RELEASE/amd64/latest.ssl
[...]
root    5974   0,2  0,0   22336   10592  1- D    19:50      2:29,09 pkg audit
-F
[...]
root    2745   0,1  0,0   22336   10592  3- D    22:11      0:01,07 pkg audit
-F
[...]

Very strange situation. Never encountered that since I started with 386BSD and
FreeBSD 1.0!

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