[Bug 200493] Killing pid 11 (idle) wedges the disk IO

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200493

--- Comment #2 from Edward Tomasz Napierala <trasz at FreeBSD.org> ---
The report is weird, because the bug is.  I have no idea what could be causing
this, and how to approach debugging it.  More data points: the slowdown is
there also for md(4).  You can make things go faster by holding "enter" at the
terminal; basically try this:

kill -KILL 11
mdconfig -s1g
while :; do dd if=/dev/md0 of=/dev/null bs=1m count=256; done

and then see what happens when you hold down the enter key, and otherwise.

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