GNU bug report logs - #36924
GDM, GNOME Shell, etc. break when there are stale caches

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Message #8 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Efraim Flashner <efraim <at> flashner.co.il>
To: Ricardo Wurmus <rekado <at> elephly.net>
Cc: guix-devel <at> gnu.org, bug-guix <at> gnu.org
Subject: Re: fixing GDM + GNOME Shell
Date: Mon, 5 Aug 2019 10:17:19 +0300

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On Sun, Aug 04, 2019 at 11:00:41PM +0200, Ricardo Wurmus wrote:
> Hi Guix,
> 
> Today I again couldn’t log into my workstation after upgrading the
> system.  I’m using GDM + GNOME Shell.
> 
> At first GDM wouldn’t start.  I knew what to do: remove /var/lib/gdm,
> because some state must have accumulated there.

For this one can we create a single-shot service that, on reconfigure or
boot, removes this directory and recreates it? In fact, it seems this is
basically what Debian does¹.

> 
> GDM came up after a reboot, but I still couldn’t log in.  Instead I was
> thrown back to the login screen without any error message.  I looked in
> ~/.cache/gdm/session.log for information, but it only told me that
> gnome-shell was killed.  Thanks.
> 
> After removing both .local/share and .cache out of the way I could log
> in again.

This part seems a little harder to automate. /etc/skel is only sourced
when a user is created, so it's hard to make sweeping changes to help
people in this case, if they even want automated help. I'm guessing
making .cache/gdm(?) read-only would create other issues.

> 
> This happens whenever I upgrade the system.  This makes the system
> rather frustrating to use.  I don’t know if booting into an older system
> generation would result in the same problem, but my guess is that it
> would because both GDM and GNOME Shell appear to be leaving some binary
> files behind that cause different versions to crash unceremoneously.
> 
> What can we do to make GDM and GNOME Shell more reliable?

Modify the logout scripts to remove a users' .cache file seems extreme.
Some of the other options, such as removing and recreating directories
would address other issues we've had (such as /var/cache/fontconfig).


¹ https://sources.debian.org/src/gdm3/3.30.2-3/debian/gdm3.postinst/#L76

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