[Bug 87694] New: Crash in brw_begin_transform_feedback

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87694

            Bug ID: 87694
           Summary: Crash in brw_begin_transform_feedback
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: nmcveity at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 111311
  --> https://bugs.freedesktop.org/attachment.cgi?id=111311&action=edit
Makefile for demo program

I have found a crash in the i965 gen6 code path on trunk.

The crash occurs if you attempt to perform transform feedback after 
you have rendered using a geometry shader.

The work around is to draw something without a geometry shader
before attempting to do any transform feedback.

The attached files contains a simplified demonstration program
using glut.

 > make

Will hopefully generate 'will_crash' and 'workaround' executables.

I ran 'will_crash' in gdb with debug versions of mesa trunk @b3057f8
installed on my system. I have attached the backtrace and other info
gleaned from gdb. They are in the attached CRASH.txt file.

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