[Bug 80325] New: [SNA] segfault in git master (b3d3c0e8e75)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80325

          Priority: medium
            Bug ID: 80325
          Assignee: chris at chris-wilson.co.uk
           Summary: [SNA] segfault in git master (b3d3c0e8e75)
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: blocker
    Classification: Unclassified
                OS: Linux (All)
          Reporter: freedesktop at h.totakura.in
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

Created attachment 101479
  --> https://bugs.freedesktop.org/attachment.cgi?id=101479&action=edit
Backtrace from the core file

I was trying Dave Airlie's new DP MST patches
(http://cgit.freedesktop.org/~airlied/linux/log/?h=drm-i915-mst-support) on my
T440s with two monitors with different resolutions connected via an ultradock. 
This segfault occurs always when I un-dock the laptop from the dock.  I guess
this is relavant: while undocking, the gnome-settings daemon tries to configure
X to use just the laptop's display through xrandr and that is where the crash
occurs.

Previously, I tried 2.99.912 version which crashed upon changing the
orientation of a connected monitor through xrandr.  This current git master
(b3d3c0e8e75) does not have this problem.


-- Window manager: i3 + gnome-settings-daemon
-- chipset: 00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT
Integrated Graphics Controller (rev 09)
-- system architecture: x86-64
-- xf86-video-intel: GIT head/master b3d3c0e8e75a963262e4dc463fef60d7e9f1f01a
-- xserver: X.Org X Server 1.15.1-1 from latest Debian testing
-- kernel version: 3.14.0 (drm-i915-mst-v3.14 branch from
http://cgit.freedesktop.org/~airlied/linux/log/?h=drm-i915-mst-support)
-- Linux distribution: current Debian Testing
-- Machine or mobo model: Lenovo T440s
-- Display connector: DP MST (eDP + HDMI + DVI)

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