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Bug#960355: Invalid serial console blocks system boot

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  Bug#960355: Invalid serial console blocks system boot Jonas Zeiger <jonas.zeiger@talpidae.net> - 2020-05-12 01:30 +0200
    Bug#960355: marked as done (Invalid serial console blocks system  boot) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2020-05-16 01:00 +0200
    Bug#960355: marked as done (Invalid serial console blocks system  boot) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2020-09-11 22:40 +0200

#67067 — Bug#960355: Invalid serial console blocks system boot

Package: initramfs-tools-core
Version: 0.137

Putting a serial console on a non-existent/broken serial port
via the last "console=" argument of the kernel command line
causes the initrd to hang without completing the boot process.

If the problematic serial console argument comes first in the kernel
command line, the system boots without issues.


***To reproduce:***

1. Check for a non-connected/disabled serial port.

	On the problematic system running

	[$] stty -a -F /dev/ttyS1
	stty: /dev/ttyS1: Input/output error

	The serial ports are registered by the "serial8250" driver but are 
probably not wired to anything.


2. Boot with a kernel command line that puts serial console on a 
non-existent/broken serial port via last "console=" argument:

	console=tty0 console=ttyS1,115200n8


3. Check if system boots successfully


I am using Debian GNU/Linux 11 (bullseye/testing), vanilla kernel 
5.7-rc5.


This issue was initially reported multiple times for Debian and Ubuntu
to the systemd maintainers as:

https://github.com/systemd/systemd/issues/15656  (for Ubuntu)
https://github.com/systemd/systemd/issues/15783  (for Debian, duplicate)


I am not sure if the _exact_ cause of both issues is the same,
because I observed the problem on a very minimal system without
console-setup or kbd.

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#67099 — Bug#960355: marked as done (Invalid serial console blocks system boot)

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Your message dated Fri, 15 May 2020 23:48:38 +0100
with message-id <79d76a6cb696073e28d9659460657b46b34a5e26.camel@decadent.org.uk>
and subject line Re: Invalid serial console blocks system boot
has caused the Debian Bug report #960355,
regarding Invalid serial console blocks system boot
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
960355: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=960355
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems

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#68100 — Bug#960355: marked as done (Invalid serial console blocks system boot)

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Your message dated Fri, 11 Sep 2020 20:36:04 +0000
with message-id <E1kGpm8-000IoH-2Y@fasolo.debian.org>
and subject line Bug#960355: fixed in initramfs-tools 0.138
has caused the Debian Bug report #960355,
regarding Invalid serial console blocks system boot
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
960355: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=960355
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems

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