Bug#808151: systemd: failed to start remount root and kernel file system

Frank B. Brokken f.b.brokken at rug.nl
Thu Dec 17 15:24:14 GMT 2015

Dear Michael Biebl, you wrote:
> Am 17.12.2015 um 13:46 schrieb Frank B. Brokken:

> > halt. No reboot (e.g. ctrl-alt-del) is possible and there's no rescue shell> 
> What exactly do you mean with halt? The systems completely locks up so
> you can't use the keyboard and switch to tty9?

No, that's not what happens. I mean that doing a reboot using ctrl-alt-del
isn't possible. Switching VTs is no problem, but except for VT1 nothing was
being shown. But maybe I overlooked things when I sent you the previous reply:
see below.

> That would sound like a kernel problem.

> > might my problem not simply be some timing problem?
> Can you make a screenshot or a video from the boot process with "quiet"
> removed from the kernel command line.

I did. Not only that, I also tried to reboot again and this time I was able to
run the commands you asked before from tty9:

    systemctl status
    systemd-analyze dump
    journalctl -alb

This time the debug shell prompt was available at tty9, although booting
failed. And in line with my previous findings, systemd-analyze and journalctl
weren't available, as they live in /usr/bin, and /usr hadn't been mounted. But
after mounting /usr from tty9 and then using the mount command systemd-analyze
and journalctl were available, so I also have the output from those commands
for you. The output, and the mp4 movie I made during the booting process are a
bit too large for the e-mail, but they are available for download/inspection
at https://www.icce.rug.nl/systemd/


    Frank B. Brokken
    Center for Information Technology, University of Groningen
    (+31) 50 363 9281 
    Public PGP key: http://pgp.surfnet.nl
    Key Fingerprint: DF32 13DE B156 7732 E65E  3B4D 7DB2 A8BE EAE4 D8AA
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