[Bug 73981] New: Intel segfault at Xorg startup with latest bits (regression).

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73981

          Priority: medium
            Bug ID: 73981
          Assignee: chris at chris-wilson.co.uk
           Summary: Intel segfault at Xorg startup with latest bits
                    (regression).
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: nbowler at draconx.ca
          Hardware: Other
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

Created attachment 92680
  --> https://bugs.freedesktop.org/attachment.cgi?id=92680&action=edit
Xorg.0.log

With the latest git xf86-video-intel I am getting a segfault immediately upon
starting the X server.  The last known working version of the driver was
1.15.0 which unfortunately not longer builds against the latest X server.
Here's the backtrace from GDB...

  Program terminated with signal 11, Segmentation fault.
  #0  0x00007ffbb6f8e187 in sna_probe_initial_configuration
(sna=0x7ffbbb936000)
      at sna_display.c:3495
  3495                if (to_sna_crtc(crtc)->id != crtc_id)
  (gdb) bt
  #0  0x00007ffbb6f8e187 in sna_probe_initial_configuration
(sna=0x7ffbbb936000)
      at sna_display.c:3495
  #1  0x00007ffbb6f8e743 in sna_mode_pre_init (scrn=0x1a2cbe0, 
      sna=0x7ffbbb936000) at sna_display.c:3638
  #2  0x00007ffbb6f934d3 in sna_pre_init (scrn=0x1a2cbe0, flags=0)
      at sna_driver.c:611
  #3  0x000000000047e392 in InitOutput (
      pScreenInfo=pScreenInfo at entry=0x822200 <screenInfo>, argc=argc at entry=1, 
      argv=argv at entry=0x7fff40f69418)
      at
/usr/src/debug/x11-base/xorg-server-1.15.0/xorg-server-1.15.0/hw/xfree86/common/xf86Init.c:594
  #4  0x000000000043f906 in dix_main (argc=1, argv=0x7fff40f69418, 
      envp=<optimized out>)
      at
/usr/src/debug/x11-base/xorg-server-1.15.0/xorg-server-1.15.0/dix/main.c:200
  #5  0x00007ffbb9a46bf5 in __libc_start_main (main=0x42a520 <main>, argc=1, 
      ubp_av=0x7fff40f69418, init=<optimized out>, fini=<optimized out>, 
      rtld_fini=<optimized out>, stack_end=0x7fff40f69408) at libc-start.c:258
  #6  0x000000000042a551 in _start ()

Obligatory version information...

  Intel G45 chip
  Linux 3.12.5
  xf86-video-intel (git but most of the 2.99.xxx versions I tried failed too)
  X server 1.15.0
  libdrm 2.4.51

I will attempt to bisect if I have time

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