[Bug 231099] getty fails to open /dev/ttyu0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231099

            Bug ID: 231099
           Summary: getty fails to open /dev/ttyu0
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: sbruno at FreeBSD.org

FreeBSD bgp0.ysv.freebsd.org 12.0-ALPHA3 FreeBSD 12.0-ALPHA3 #0 r338350M: Tue
Aug 28 17:14:21 UTC 2018    
peter at build-12.freebsd.org:/usr/obj/usr/src/sys/CLUSTER12  amd64


After a reboot, the getty attaching to ttyu0 on a few hosts will attach and
present a login for administrative purposes.

At some point, and for some unknown reason, getty will exit and init will be
unable to restart it.

Sep  2 17:41:58 bgp0 init[9998]: getty repeating too quickly on port
/dev/ttyu0, sleeping 30 secs
Sep  2 17:42:28 bgp0 init[10003]: getty repeating too quickly on port
/dev/ttyu0, sleeping 30 secs

This happens until a reboot.  I'm unsure if this is due to the console being
open by things like conserver or not.

Sending a HUP to init does not restart the getty.

root at bgp0.ysv:/ # ps auwxxx | grep getty
root     1207   0.0  0.1 10844  2424 v0  Is+  Wed15       0:00.00
/usr/libexec/getty Pc ttyv0
root     1208   0.0  0.1 10844  2424 v1  Is+  Wed15       0:00.00
/usr/libexec/getty Pc ttyv1
root     1209   0.0  0.1 10844  2424 v2  Is+  Wed15       0:00.00
/usr/libexec/getty Pc ttyv2
root     1210   0.0  0.1 10844  2424 v3  Is+  Wed15       0:00.00
/usr/libexec/getty Pc ttyv3
root     1211   0.0  0.1 10844  2424 v4  Is+  Wed15       0:00.00
/usr/libexec/getty Pc ttyv4
root     1212   0.0  0.1 10844  2424 v5  Is+  Wed15       0:00.00
/usr/libexec/getty Pc ttyv5
root     1213   0.0  0.1 10844  2424 v6  Is+  Wed15       0:00.00
/usr/libexec/getty Pc ttyv6
root     1214   0.0  0.1 10844  2424 v7  Is+  Wed15       0:00.00
/usr/libexec/getty Pc ttyv7
root    10034   0.0  0.1 11252  2732  0  S+   17:44       0:00.00 grep getty
root at bgp0.ysv:/ # cat /etc/ttys 
#
# $FreeBSD: head/etc/etc.amd64/ttys 333436 2018-05-09 20:49:00Z imp $
#       @(#)ttys        5.1 (Berkeley) 4/17/89
#
# This file specifies various information about terminals on the system.
# It is used by several different programs.  Common entries for the
# various columns include:
#
# name  The name of the terminal device.
#
# getty The program to start running on the terminal.  Typically a
#       getty program, as the name implies.  Other common entries
#       include none, when no getty is needed, and xdm, to start the
#       X Window System.
#
# type The initial terminal type for this port.  For hardwired
#      terminal lines, this will contain the type of terminal used.
#      For virtual consoles, the correct type is typically xterm.
#      Other common values include dialup for incoming modem ports, and
#      unknown when the terminal type cannot be predetermined.
#
# status Must be on or off.  If on, init will run the getty program on
#        the specified port.  If the word "secure" appears, this tty
#        allows root login.
#
# name  getty                           type    status          comments
#
# If console is marked "insecure", then init will ask for the root password
# when going to single-user mode.
console none                            unknown off secure
#
ttyv0   "/usr/libexec/getty Pc"         xterm   onifexists secure
# Virtual terminals
ttyv1   "/usr/libexec/getty Pc"         xterm   onifexists secure
ttyv2   "/usr/libexec/getty Pc"         xterm   onifexists secure
ttyv3   "/usr/libexec/getty Pc"         xterm   onifexists secure
ttyv4   "/usr/libexec/getty Pc"         xterm   onifexists secure
ttyv5   "/usr/libexec/getty Pc"         xterm   onifexists secure
ttyv6   "/usr/libexec/getty Pc"         xterm   onifexists secure
ttyv7   "/usr/libexec/getty Pc"         xterm   onifexists secure
ttyv8   "/usr/local/bin/xdm -nodaemon"  xterm   off secure
# Serial terminals
# The 'dialup' keyword identifies dialin lines to login, fingerd etc.
ttyu0   "/usr/libexec/getty std.115200" xterm   on secure
ttyu1   "/usr/libexec/getty std.9600"   dialup  off secure
ttyu2   "/usr/libexec/getty std.9600"   dialup  off secure
ttyu3   "/usr/libexec/getty std.9600"   dialup  off secure
# Dumb console
dcons   "/usr/libexec/getty std.9600"   vt100   off secure

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