[Bug 63666] New: X freezes on scrolling

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63666

          Priority: medium
            Bug ID: 63666
          Assignee: chris at chris-wilson.co.uk
           Summary: X freezes on scrolling
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: petrel.hart at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

Created attachment 78163
  --> https://bugs.freedesktop.org/attachment.cgi?id=78163&action=edit
backtrace from gdb and accompanying Xorg bt.

Hardware: lenovo E530c ("Intel Corporation 2nd Generation Core Processor Family
Integrated Graphics Controller")
driver: i915
OS: debian 3.2.0-4-amd64
xserver-xorg-video-intel: 2:2.20.14-1

Symptom:

1) Open libreoffice writer; new document.
2) Make a few new pages (ctl-enter).
3) Scroll up and down rapidly with the touchpad a few times.
4) X freezes, with two outcomes: (a) either a hung GPU and all windows black
(but, mouse still moves); or else (b) totally frozen X with "[mi] EQ overflow
continuing." and backtrace in Xorg.0.log.

This doesn't occur on a similar lenovo machine (T420i).  It doesn't seem to
happen in other applications; libreoffice folks determined it to be not their
problem ( https://bugs.freedesktop.org/show_bug.cgi?id=62946 ) and suggested
the intel drivers.

Logs for case (a) are at
http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=10;att=0;bug=703749 and for
case (b) are at
http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=15;att=0;bug=703749 .

I've also attached a debugger to Xorg, as described here (
http://wiki.x.org/wiki/Development/Documentation/ServerDebugging , although it
need ctrl-c to get it to backtrace) -- I'm attaching the backtrace from case
(b).

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