[Bug 57118] xorg-server-1.13.0 lockups with intel driver >= 2.20.10

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=57118

--- Comment #12 from Tassilo Horn <tsdh at gnu.org> ---
(In reply to comment #11)
> It is your compositing manager that is not rendering, and the process you
> should be xtracing and inspecting.

I've done that now, and I'm going to attach two tarballs containing the
information from my latest two freezes.  I was running with the intel drivers
from git, commit 37eb7343be1aeeb90a860096756603a577df1a77.

Every tarball contains

  1. a backtrace of X (which is the same than the previous backtraces attached
to this issue)
  2. a backtrace of gnome-shell (the compositing manager of GNOME)
  3. a x11trace.txt.N file that contains the information from the command

         DISPLAY=:0 x11trace -o ~/x11trace.txt -- /usr/bin/gnome-shell

     from the invocation of gnome-shell until several minutes after the freeze.
 (x11trace is the xtrace utility.  My distro renamed it because glibc also has
an xtrace program.)

After the freezes occured, I ssh-ed into the machine and made several
backtraces of X and gnome-shell, i.e., I did one backtrace, waited a minute,
then did another one.  I used a script that attaches GDB to the process, writes
a backtrace to a file, and then detaches again and lets the process continue.

Some observations:

  - After a freeze, the backtraces of X and gnome-shell don't change anymore. 
Diffing a backtrace with a backtrace I did a minute later doesn't show any
difference.  Therefore, I've put only one into each of the tarballs.

  - After a freeze, there's still data written to the x11trace.txt file.

  - When I try to shutdown or reboot the machine after a freeze by issuing
"systemctl reboot|poweroff" while logged in via ssh, the X windows disappear,
but then the system is completely locked and won't poweroff/reboot.

For the time being, I've switched back to some pre-2.20.10 intel driver.  But I
can easily switch back to the git version if you need additional information.

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