[Bug 70835] New: 2.99.905 segfaults when switching to custom modeline resolution

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70835

          Priority: medium
            Bug ID: 70835
          Assignee: chris at chris-wilson.co.uk
           Summary: 2.99.905 segfaults when switching to custom modeline
                    resolution
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jaylittle at jaylittle.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

Created attachment 88074
  --> https://bugs.freedesktop.org/attachment.cgi?id=88074&action=edit
XOrg log - contains details of the crash after I switch resolutions

The new 2.99.905 snapshot intel driver from git crashes on me whenever I
attempt to switch to a resolution created via a custom modeline on my System 76
gazp9 laptop.  My modelines are specified via an xorg.conf file:

Modeline "1600x900"  119.00  1600 1696 1864 2128  900 901 904 932  -HSync
+Vsync
Modeline "1440x900"  106.50  1440 1528 1672 1904  900 903 909 934 -hsync +vsync
Modeline "1368x768"   85.25  1368 1440 1576 1784  768 771 781 798 -hsync +vsync
Modeline "1280x1024"  109.00  1280 1368 1496 1712  1024 1027 1034 1063 -hsync
+vsync
Modeline "1280x720"   74.50  1280 1344 1472 1664  720 723 728 748 -hsync +vsync
Modeline "1024x640"   52.25  1024 1072 1168 1312  640 643 649 665 -hsync +vsync

When I log in with 2.99.905 (GDM is always configured to use the system's
native resolution) and my cinnamon session is configured to use the native
resolution of the LCD, everything works fine.  Until I try to switch to a
resolution like 1600x900.  Then X crashes and produces the output at the end of
the attached log file.

Prior to trying 2.99.905 I was using this commit:

http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=db086d02affe5109202dc9ee06c9e728a3ff0f3f

That version worked fine.  Now I haven't tried all the commit versions, but it
doesn't work when I try this one:

http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=d788b69fdb5ea73b1d283a89e53b2b19eaa90e6e

So that narrows down to around 10 different commits.

Thanks in advance for the assistance.  Also let me take this opportunity to say
how much I appreciate the team's work on this driver.  The Haswell
implementation has really come a long way and your efforts thus far have been
most appreciated!

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