Date: Tue, 05 Jan 2016 20:03:58 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 205933] [boot] Loader hangs when connecting serial console Message-ID: <bug-205933-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D205933 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: aram.h@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=20=20=20=20 root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64 $ $ cat /boot/loader.conf=20 loader_color=3D"NO" loader_logo=3D"beastiebw" boot_multicons=3D"YES" boot_serial=3D"YES" comconsole_speed=3D"115200" console=3D"comconsole,vidconsole" kern.geom.label.gptid.enable=3D"0" zfs_load=3D"YES" $ $ grep -v '^#' /etc/ttys=20 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. --=20 You are receiving this mail because: You are the assignee for the bug.=
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