[Bug 273418] [panic] Repeating kernel panic on open(/dev/console)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273418

--- Comment #23 from Eugene Grosbein <eugen@freebsd.org> ---
(In reply to Jason A. Harmening from comment #22)

Yesterday I grabbed 13.2-RELEASE/amd64 stock installation DVD image, created
bhyve virtual machine installing 13.2 from the image, built custom kernel as
GENERIC plus DIAGNOSTIC/INVARIANTS/WITNESS but without any patches.

I tried to reproduce the problem with naive shell script:

#!/bin/sh

i=0
while :
do
  i=$(($i+1))
  case "$i" in
  *000) printf "%u\r" $i ;;
  esac
  killall -1 syslogd
done

997000 iterations did not reproduce the problem. Either it does not present in
the release but only in stable/13, or the script is too haive. All I got is a
line printed to the console after its termination with Ctrl-C:

Expensive timeout(9) function: 0xffffffff80c6a980(0xfffffe00093e6560)
0.417209440s

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