Characters sent to tty1

Maybe similar to this bug: https://bugs.launchpad.net/ubuntu/+source/gdm/+bug/396226

In duplicate bug 798509, some characters (on a US/English keyboard, the 2 key in the alphanumeric portion of the keyboard, and both enter keys) trigger the X server to terminate (so it is not just that characters are sent to tty1--the X server also quits, popping the user back to a virtual console on tty1). Is that happening here as well? (Duplicate bug 798509 contains details about the specific conditions under which those keys do and do not trigger X server termination.)

Duplicate bug 803559 also seems to suggest that the "crash" occurs when the enter key is pressed, though I extrapolate in saying so.

amd64 30 June Daily Build same error, X window crash.
(This is on Aspire 5253 notebook, also failed with i386 this morning on Aspire one netbook.)
Boot
BFB select terminal
df
enter
X windows quit back to command line

Tried to do ubuntu-bug xorg and got:

ubuntu@ubuntu:~$ ubuntu-bug xorg
Traceback (most recent call last):
  File "/usr/share/apport/apport-gtk", line 25, in <module>
    import apport
ImportError: No module named apport
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/apport_python_hook.py", line 59, in apport_excepthook
    from apport.fileutils import likely_packaged
ImportError: No module named apport.fileutils

Original exception was:
Traceback (most recent call last):
  File "/usr/share/apport/apport-gtk", line 25, in <module>
    import apport
ImportError: No module named apport
ubuntu@ubuntu:~$

Jerry

@jerrylamos
Does it *only* occur when you type df and press enter, or does it occur **every time you press enter, no matter what** (as has been the case in all of my testing)? Does it occur when you press the 2 key on the alphanumeric portion (i.e., not the number pad) of the keyboard, as well (as has also been the case in all of my testing)?

Analysis with Robert:

- currently lightdm tries to start on the active VT. It shouldn't do this; if plymouth is running it should use the active VT (after proper hand-off), otherwise it should take the next available
- /etc/init/plymouth-stop.conf doesn't special-case lightdm currently, so plymouth is *never* running when lightdm starts - so we never get the hand off. As a result, we always have a race condition between the VT switch on plymouth exit, and the lightdm start-up.

1 July Daily Build live on boot, Acer Aspire one netbook
Ctrl-Alt-t terminal session:
df<enter>
killed Xorg. I don't know lightdm or plymouth code but it does appear to be consistent with the comment #6 above about a race condition.

Difference is 1 July Xorg crashed then ubuntu immediately restarted X back to a login screen. I did not have to manually restart X.

Subsequent df<enter> no problem.

Jerry

This also happens on the live system, the first session seems to start on a VT which also has a getty on it (presumably VT1). At first startup, lightdm needs to ensure that it starts on a vt >= 7, i. e. it cannot rely on X.org's "grab the next free terminal" detection.

The alternative would be to not run a getty on vt1.

I'm not 100% sure if oneiric's plymouth requires a different handling, but the above is what we did in natty and earlier for gdm:

http://bazaar.launchpad.net/~ubuntu-desktop/gdm/ubuntu/view/head:/debian/patches/06_first_vt.patch

Setting 'vt=7' in the '[seat-0]' portion of '/etc/lightdm/lightdm.conf' seems to have stopped the crashing (which I got from time to time - NOT always - using the '2' and 'Enter' key).

I can "crash" and "uncrash" X with Alt+Left/Right on an Oneiric liveusb with ubiquity-dm (not pressing anything during live-cd boot).

I think this is fixed with 0.4.2-0ubuntu1, but as Plymouth generally doesn't work I'm not going to close this until someone confirms it.

I confirm that the new version fixes this. lightdm now starts X at vt7, as it should. Thanks!

Looks like it! No crashes today, yay!

Strange. Fix released and it crashes for me hitting ENTER at the login prompt (running 11.10)

I added vt=7 to /etc/lightdm/lightdm.conf as below

[SeatDefaults]
greeter-session=unity-greeter
user-session=ubuntu
vt=7

and it stops crashing when hitting ENTER at the login promtpt. Nice!
First question: Fix Released, but what is acctually fixed?

Second question: it crashes if I start a terminal and press ENTER.
Is there something else I need to fix?