GNU bug report logs - #36865
GRUB (or 'grub.cfg') is not registered as a GC root

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: "Xavier Montillet" <xavierm02 <at> xavierm02.fr>
Subject: bug#36865: closed (Re: bug#36865: Guix gc breaks grub)
Date: Mon, 26 Aug 2019 08:20:02 +0000

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Your bug report

#36865: GRUB (or 'grub.cfg') is not registered as a GC root

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 36865 <at> debbugs.gnu.org.

-- 
36865: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=36865
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Ludovic Courtès <ludo <at> gnu.org>
To: zerodaysfordays <at> sdf.lonestar.org (Jakob L. Kreuze)
Cc: Xavier Montillet <xavierm02 <at> xavierm02.fr>,
 Ricardo Wurmus <rekado <at> elephly.net>, 36865-done <at> debbugs.gnu.org
Subject: Re: bug#36865: Guix gc breaks grub
Date: Mon, 26 Aug 2019 10:19:00 +0200

Hi Jakob,

zerodaysfordays <at> sdf.lonestar.org (Jakob L. Kreuze) skribis:

> Ludovic Courtès <ludo <at> gnu.org> writes:
>
>> Jakob, does that ring a bell?
>
> Yes, this was fixed by #36880.

Looking more closely, it seems to be
<https://issues.guix.gnu.org/issue/36942>.

Anyway, closing.  Thanks for your feedback!

Ludo’.

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From: "Xavier Montillet" <xavierm02 <at> xavierm02.fr>
To: bug-guix <at> gnu.org
Subject: Guix gc breaks grub
Date: Tue, 30 Jul 2019 22:03:54 +0000

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*Symptoms*

After running guix gc, and rebooting, I got the following errors (which stay something like half a second on the screen):

error: no such device: /gnu/store/0fijjh7qw8ppsks0ba3q9m873ljhj797-grub-2.04/share/grub/unicode.pf2
error: file `/gnu/store/0fijjh7qw8ppsks0ba3q9m873ljhj797-grub-2.04/share/grub/unicode.pf2' not found.
error: no suitable video mode found.
error: no video mode activated.

I then get to the grub menu where I can pick which version of Guix I want to boot on, but all of them lead to getting stuck on the following text (with nothing moving after that for at least several minutes):

error: no suitable video mode found.
Booting in blind mod

*Fix
*

Fortunately nckx was on IRC and saved me by telling me to press C to get the grub command line when I got to the grub menu and run setup_gfxterm.

Running guix system reconfigure config.scm removed the need for setup_gfxterm for subsequent boots.

*Cause*

guix gc thinks that grub (and a lot of other stuff that it shouldn't think is dead) is dead, as shown by the following commands (given by nckx):


$ grep unicode /boot/grub/grub.cfg
search --file --set /gnu/store/0fijjh7qw8ppsks0ba3q9m873ljhj797-grub-2.04/share/grub/unicode.pf2
if loadfont /gnu/store/0fijjh7qw8ppsks0ba3q9m873ljhj797-grub-2.04/share/grub/unicode.pf2; then

$ guix gc --list-dead | grep 0fijjh7qw8ppsks0ba3q9m873ljhj797
finding garbage collector roots...
determining live/dead paths...
/gnu/store/0fijjh7qw8ppsks0ba3q9m873ljhj797-grub-2.04

I was also able to reproduce the bug by running guix gc and rebooting again.

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