[Bug 288345] poudriere run, hanging umounts, system fails to reboot due to hanging processes

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288345

--- Comment #52 from Craig Leres <leres@freebsd.org> ---
(In reply to Craig Leres from comment #49)
Grrr... It looks like there is more than one bug. A single process, created 8
minutes into the poudriere run, got stuck on dwait:

    zinc 63 # ps wwu81115
    USER   PID %CPU %MEM   VSZ RSS TT  STAT STARTED    TIME COMMAND
    root 81115  0.0  0.0 21176  72  -  DJ   00:08   0:00.01 /usr/bin/tar -xf
/portdistfiles/YAML-Tiny-1.76.tar.gz --no-same-owner --no-same-permissions
(bsdtar)

This hang is different than what I saw before 8b64d46fab87, only one process is
stuck and poudriere has been able to build > 1000 packages since the hang --
poudriere lists the stuck build with status "extract/timeout".

I used sysctl debug.kdb.panic=1 to create a crash dump and put it and other
relevant files (including procstat -kka output) here:

    https://ee.lbl.gov/.bsd-AzEfh3/

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