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systemd gone crazy : screen flashes at boot, can't log in
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Carlino
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PostPosted: Sat Feb 06, 2016 10:14 pm    Post subject: systemd gone crazy : screen flashes at boot, can't log in Reply with quote

Hello,

Well, don't remember what has been upgraded last time I ran emerge -Du @world, (besides Nvidia drivers), but since, I just can't reach my box.
Boot time ends with no gdm showing up ; well I can deal with that... But the worse thing is that I can't even get to log in, from tty, since the screen, (and lights on the keyboard) keep flashing, really fast, (faster than when "kernel panic" strikes).
I hit the keys "root", intending to log as root, despite flashes, but some letters need to be hit several times to get on the screen ; just can't get my password to be validated....

So, I've chroot in, recompile kernel, but couldn't get to run module-rebuild, ending up with:
Code:
 Failed to validate a sane '/dev'.
bash process substitute doesn't work; this may be an indication of a broken '/dev/fd'.


Is it because /usr/portage is on a different fs ? Tried to mount the fs into chrooted environment, but no result.

I also mounted /var/log, so I could dig in logs and try to find out why boot is so funky...Ran journalctl from chrooted environment, but no luck : I got "No journal files were found".

So I ended up recording the boot sequence, (it goes so fast before it switches to flashing tty, that I can't even get to read where it twisted).

So what I see (in slow motion from my cell phone recorder):
Code:
[ OK ] Starting Accounts Service...
[ OK ] Created slice user-104.slice. 
          Starting User Manager for UID 104
[ OK ] Started Session  c1 for user gdm.
[ OK ] Started User Manager for UID 104...
          Stopping User Manager for UID 104...
[ OK ] Stopped User Manage for UID 104.
[ OK ] Removed slice user-104.slice.
[ OK ] Created slice user-104.slice. 
          Starting User Manager for UID 104
[ OK ] Started Session  c2 for user gdm.
[ OK ] Started User Manager for UID 104...
          Stopping User Manager for UID 104...
[ OK ] Stopped User Manage for UID 104.
[ OK ] Removed slice user-104.slice.
[ OK ] Created slice user-104.slice. 
          Starting User Manager for UID 104
[ OK ] Started Session  c3 for user gdm.
[ OK ] Started User Manager for UID 104...
          Stopping User Manager for UID 104...
[ OK ] Stopped User Manage for UID 104.
[ OK ] Removed slice user-104.slice.
[ OK ] Created slice user-104.slice. 
          Starting User Manager for UID 104
[ OK ] Started Session  c4 for user gdm.
[ OK ] Started User Manager for UID 104...
          Stopping User Manager for UID 104...
[ OK ] Stopped User Manage for UID 104.
[ OK ] Removed slice user-104.slice.


And so on in an infinite loop with c ("from Started Session c* for user gdm".) increasing. I thing that's what lead to the flickering / flashing tty.

So, is there a way I could boot interactively with systemd, like with OpenRC ? What did I miss with not being able to emerge --ask @module-rebuild ( Failed to validate a sane '/dev'.), after I recompile my kernel, from chroot env ? Any clue about slice user-104.slice ?

Regards
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Carlino
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Joined: 25 May 2005
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Location: Bordeaux, France

PostPosted: Sun Feb 07, 2016 1:07 pm    Post subject: Reply with quote

So far I managed to boot in rescue mode, editing grub before boot time, and adding "rescue" at the end of the line starting with "linux" ; so, I do boot and get a nice and shiny tty, (no flickering or shining behaviour).
So now, I can get to see what journalctl -r is up to.... Well, first hint, it's talking about a nvidia driver not matching the kernel version, or so. I'm going to recompile, and then run @module-rebuild.
Let's start from here....
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Carlino
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Joined: 25 May 2005
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Location: Bordeaux, France

PostPosted: Sun Feb 07, 2016 8:45 pm    Post subject: Reply with quote

Well, upgrading the kernel didn't change much besides the fact that now, boot time doesn't end up with endless loop on "Created slice user-104.slice", it just hangs on
Code:
[ OK ] Started User Manager for UID 104...


and then, nothing ; hanged, frozen.... BUT, if I pool out RJ45 cable, then, gdm starts, and I can login... but that's it, because, I never reach the desktop environment ; black screen. even weirder : RJ45 cable pooled out, GDM available : I only can log in as root, and reach the desktop environment ! how nuts is that ?!
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Wallsandfences
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PostPosted: Mon Feb 08, 2016 12:03 pm    Post subject: Reply with quote

Did you reinstall nividia-drivers?
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