[Mesa-dev] [Bug 91687] Crash when creating new context after destroying the old one using indirect rendering

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91687

            Bug ID: 91687
           Summary: Crash when creating new context after destroying the
                    old one using indirect rendering
           Product: Mesa
           Version: 10.5
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Mesa core
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: gqmelo at gmail.com
        QA Contact: mesa-dev at lists.freedesktop.org

Created attachment 117783
  --> https://bugs.freedesktop.org/attachment.cgi?id=117783&action=edit
VTK/Qt Python program that crashes

I tested that on mesa Ubuntu 14.04 (mesa 10.3.2) and 15.10 (mesa 10.5.2). I'm
not sure if it is reproducible. The attached traces were gotten on Ubuntu
14.04.

The crash happens when running the attached python program crash_mesa_vtk_qt.py
using indirect rendering (specifically I need to run it inside a chroot that
has a very old mesa version)

It uses vtk and Qt, I'm sorry I could not come up with a more isolated example,
but I'm not very familiar with opengl programming.


In summary, that is what is happening:

1 - A vtk render window is created and rendered the first time (that makes vtk
create a new glx context)

2 - The vtk render window is set to render offscreen (it is not using OSMesa).
That makes vtk destroy the current context and create a new one associated to a
new X offscreen window.

3 - The window is rendered and I could even generate a png file.

4 - The vtk render window is set to render on screen again. That makes vtk
destroy the current glx context and create a new one associated to the first X
window (the on screen window).

5 - When rendering the vtk window again, X server crashes (stack trace
attached).


Looking into vtk code it does not seem it is doing anything wrong. The
offscreen related code can be found on:

https://gitlab.kitware.com/vtk/vtk/blob/v6.2.0/Rendering/OpenGL/vtkXOpenGLRenderWindow.cxx#L800

https://gitlab.kitware.com/vtk/vtk/blob/v6.2.0/Rendering/OpenGL/vtkOpenGLRenderWindow.cxx#L1856

https://gitlab.kitware.com/vtk/vtk/blob/v6.2.0/Rendering/OpenGL/vtkXOpenGLRenderWindow.cxx#L943

https://gitlab.kitware.com/vtk/vtk/blob/v6.2.0/Rendering/OpenGL/vtkOpenGLRenderWindow.cxx#L1856

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