https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205933
Bug ID: 205933
Summary: [boot] Loader hangs when connecting serial console
Product: Base System
Version: 10.2-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: ara...@mgk.ro
$ freebsd-version ; uname -a
10.2-RELEASE-p8
FreeBSD z800.mgk.ro 10.2-RELEASE-p7 FreeBSD 10.2-RELEASE-p7 #0: Mon Nov 2
14:19:39 UTC 2015
r...@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64
$
$ cat /boot/loader.conf
loader_color="NO"
loader_logo="beastiebw"
boot_multicons="YES"
boot_serial="YES"
comconsole_speed="115200"
console="comconsole,vidconsole"
kern.geom.label.gptid.enable="0"
zfs_load="YES"
$
$ grep -v '^#' /etc/ttys
console none unknown off secure
ttyv0 "/usr/libexec/getty Pc" xterm on secure
ttyv1 "/usr/libexec/getty Pc" xterm on secure
ttyv2 "/usr/libexec/getty Pc" xterm on secure
ttyv3 "/usr/libexec/getty Pc" xterm on secure
ttyv4 "/usr/libexec/getty Pc" xterm on secure
ttyv5 "/usr/libexec/getty Pc" xterm on secure
ttyv6 "/usr/libexec/getty Pc" xterm on secure
ttyv7 "/usr/libexec/getty Pc" xterm on secure
ttyv8 "/usr/local/bin/xdm -nodaemon" xterm off secure
ttyu0 "/usr/libexec/getty std.115200" vt100 onifconsole 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
dcons "/usr/libexec/getty std.9600" vt100 off secure
When I boot without a serial console attached, boot proceeds fine
(the loader autoboots after an interval). However, when I attach a
serial console, the loader hangs as if I had pressed a key to stop
the boot. The boot proceeds normally after I press Enter.
This seems to be correlated with whether I have a remote terminal
emulator on that serial line or not. If there's nobody listening,
so to speak, the boot proceeds fine, but if I connect with screen,
cu, or minicom, the boot pauses and waits for input.
Not sure if this matters or not, but the remote machine connects
to the serial console through an USB adapter.
This seems to be related, or perhaps the same problem as the one
described in this mailing list post:
https://lists.freebsd.org/pipermail/freebsd-stable/2014-April/078378.html.
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