Nouveau - Jun 2008 - [Bug 16233] New: [Randr12] Server crash when detecting DVI output change

http://bugs.freedesktop.org/show_bug.cgi?id=16233

           Summary: [Randr12] Server crash when detecting DVI output change
           Product: xorg
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: chalserogers at gmail.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=16916)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=16916)
Xorg log containing crash after running 'xrandr'

I have two DVI devices: a LCD panel with single channel DVI interface and a TV
connected over a dual-channel DVI->HDMI.  Nouveau kills X when swapping
between
them in the following way:
1) Connect LCD panel to DVI port.
2) xrandr --auto to bring it up.
3) xrandr --output DVI-D-0 --off to bring it down
4) Disconnect LCD, plug DVI->HDMI cable into same DVI port
5) Run xrandr <-- Crash here.

This is symmetric, in that TV->LCD crashes in the same way that LCD->TV
does.

I've run a git-bisect, and the offending commit is:
cdae2e26cc432ba572f92522f1b3454264d38f43 is first bad commit
commit cdae2e26cc432ba572f92522f1b3454264d38f43
Author: Maarten Maathuis <madman2003 at gmail.com>
Date:   Fri Jan 25 00:10:08 2008 +0100

    randr12: Rework native modes for TMDS.

    - Choose a preferred ddc mode when available, otherwise the one with the
highest refresh.
    - Fall back on cvt modes, only when needed.

:040000 040000 497af7e1199ee5079d38ab8dd668c1612230dfb7
78929b01e4e079417a26e25b64788c5c75cf3878 M      src


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--- Comment #1 from Christopher James Halse Rogers <chalserogers at
gmail.com>  2008-06-04 14:51:50 PST ---
Created an attachment (id=16917)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=16917)
dmesg log, before crash with 'xrandr'


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Christopher James Halse Rogers <chalserogers at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #16917|application/octet-stream    |text/plain
          mime type|                            |




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--- Comment #2 from Christopher James Halse Rogers <chalserogers at
gmail.com>  2008-06-04 14:53:40 PST ---
Created an attachment (id=16918)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=16918)
dmesg log, after crashing with 'xrandr' and X restarting.


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Christopher James Halse Rogers <chalserogers at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #16916|text/x-apport               |text/plain
          mime type|                            |




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--- Comment #3 from Stuart Bennett <sb476 at cam.ac.uk>  2008-06-25
11:53:20 PST ---
Using current DDX code, can you attach gdb to the Xorg process (using an
xserver with debug symbols, as described in
http://www.x.org/wiki/Development/Documentation/ServerDebugging) before
triggering this bug, to give a better idea of what member gets dereferenced and
causing problems in xf86DuplicateMode?


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--- Comment #4 from Christopher James Halse Rogers <chalserogers at
gmail.com>  2008-06-26 05:10:50 PST ---
Created an attachment (id=17392)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=17392)
GDB session of X server crash upon running "xrandr"

GDB backtrace, taken by starting X attached to TV, plugging in the LCD,
attaching gdb and running "xrandr"


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--- Comment #5 from Stuart Bennett <sb476 at cam.ac.uk>  2008-06-26
06:48:06 PST ---
Created an attachment (id=17393)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=17393)
allow screen dimensions to change

Try this


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--- Comment #6 from Christopher James Halse Rogers <chalserogers at
gmail.com>  2008-06-28 19:03:47 PST ---
That works, thanks.


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Stuart Bennett <sb476 at cam.ac.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED




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