Bug#805605: xserver-xorg-core: crash/freeze on logout of tty that was previously serving as a vt for X

[Laurent Bigonville <bigon@debian.org>]

On Tue, 05 Jan 2016 09:05:02 +0100 Justus Piater 
<Justus-dev@Piater.name> wrote:

Hello,

> I believe I am seeing the same bug (similar symptoms, similar X
> backtrace). It is triggered simply by logging out on some other VT;
> multiple X servers are not required. To reproduce on a freshly-booted
> machine:
>
> - log in (on VT1)
> - startx
> - switch to VT2
> - log in
> - log out
>
> At this point, instead of leaving me on VT2 with a login prompt, it
> automatically switches back to VT1, which is stuck as Brian describes.
>
> Brian, can you reproduce this? If so, I suggest changing the bug title
> to something like:
>
> xserver-xorg-core: crash/freeze on logout on another vt
>
> There appears to be some non-determinism:
>
> - Sometimes the VT1 terminal still shows the mouse pointer (on the
> otherwise empty i3 desktop); sometimes not. (On attempting to switch
> to a different VT, the mouse pointer, if still present, always
> disappears.)
>
> - During my many trials, in a single case, logging out on VT2 worked as
> expected, except that screen brightness was very low.
>
> I'm using an up-to-date Stretch, with rootless X and no display manager,
> using the i915 GPU driver (like Brian apparently, but with a different
> Intel graphics controller, "00:02.0 VGA compatible controller [0300]:
> Intel Corporation Core Processor Integrated Graphics Controller
> [8086:0046] (rev 02)").

This looks like https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=810660

Can you try to edit the .bash_logout file in your user directory and 
remove the call to clear_console ?

Cheers,

Laurent Bigonville