I could not reproduce that bug using the live CD for 1 hour. Given that
I'm not using unity, given that the bug happens in a way that is very
unpredictable (sometimes 2-3 times in a row in 10 minutes, then nothing
for several days), this does not mean that this bug is fixed. I'm not
even sure that the live CD uses the same driver (intel_drv) which seems
responsible for the crash.

That bug happened to me once again 1 hour ago (exact same callstack).

Being myself a developer, I can if you indicate me how, install debug
symbols for that module (does this exist?) and give you more info. From
my experience, a bug like this seems to depend on some unitialized
variable which value depends on what's in the graphics memory at the
time of use.

Is there a way not to use intel_drv?

thx for the help

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https://bugs.launchpad.net/bugs/1472471

Title:
  XServer crash logs the user off randomly

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