[Paraview] Segfault with OpenGL2

Mon Apr 11 13:07:45 EDT 2016

Dear Chuck, dear Ken,

thanks for the replies.

> I've had similar issues with VirtulGL and VTK in the past.  The "Shader object was not initialized, cannot attach it." error is often the result of some sort of required OpenGL version support for a specific call is lacking.  A few questions:
> 	• Are you able to run on the actual machine without Virtual GL?
the machine is a headless server down in our machine room, and I can not easily access it.

> 	• What does the output of glxinfo running in the x2go+VirtualGL environment look like?
Here is how it looks like:
$ vglrun glxinfo
name of display: :55
display: :55  screen: 0
direct rendering: Yes
server glx vendor string: VirtualGL
server glx version string: 1.4
server glx extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_profile, 
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_swap_control, 
    GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating, 
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGI_make_current_read, 
    GLX_SGI_swap_control, GLX_SUN_get_transparent_index
client glx vendor string: VirtualGL
client glx version string: 1.4
client glx extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_profile, 
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_swap_control, 
    GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating, 
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGI_make_current_read, 
    GLX_SGI_swap_control, GLX_SUN_get_transparent_index
GLX version: 1.4
GLX extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_profile, 
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_swap_control, 
    GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating, 
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGI_make_current_read, 
    GLX_SGI_swap_control, GLX_SUN_get_transparent_index
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: Tesla M2075/PCIe/SSE2
OpenGL core profile version string: 4.5.0 NVIDIA 361.28
OpenGL core profile shading language version string: 4.50 NVIDIA
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
…
lots of extensions
…
OpenGL version string: 4.5.0 NVIDIA 361.28
OpenGL shading language version string: 4.50 NVIDIA
OpenGL context flags: (none)
OpenGL profile mask: (none)

---
Without vglrun I get:

$ glxinfo
name of display: :55
display: :55  screen: 0
direct rendering: No (If you want to find out why, try setting LIBGL_DEBUG=verbose)
server glx vendor string: SGI
server glx version string: 1.2
server glx extensions:
    GLX_ARB_multisample, GLX_EXT_import_context, GLX_EXT_visual_info, 
    GLX_EXT_visual_rating, GLX_OML_swap_method, GLX_SGIS_multisample, 
    GLX_SGIX_fbconfig, GLX_SGIX_hyperpipe, GLX_SGIX_swap_barrier, 
    GLX_SGI_make_current_read
client glx vendor string: NVIDIA Corporation
client glx version string: 1.4
client glx extensions:
    GLX_ARB_context_flush_control, GLX_ARB_create_context, 
    GLX_ARB_create_context_profile, GLX_ARB_create_context_robustness, 
    GLX_ARB_fbconfig_float, GLX_ARB_get_proc_address, GLX_ARB_multisample, 
    GLX_EXT_buffer_age, GLX_EXT_create_context_es2_profile, 
    GLX_EXT_create_context_es_profile, GLX_EXT_fbconfig_packed_float, 
    GLX_EXT_framebuffer_sRGB, GLX_EXT_import_context, GLX_EXT_stereo_tree, 
    GLX_EXT_swap_control, GLX_EXT_swap_control_tear, 
    GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating, 
    GLX_NV_copy_buffer, GLX_NV_copy_image, GLX_NV_delay_before_swap, 
    GLX_NV_float_buffer, GLX_NV_multisample_coverage, GLX_NV_present_video, 
    GLX_NV_swap_group, GLX_NV_video_capture, GLX_NV_video_out, 
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGI_swap_control, 
    GLX_SGI_video_sync
GLX version: 1.2
GLX extensions:
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context, 
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_SGIX_fbconfig
OpenGL vendor string: Mesa project: www.mesa3d.org
OpenGL renderer string: Mesa GLX Indirect
OpenGL version string: 1.2 (1.5 Mesa 6.4.1)

---
On my local box, I get:

$ glxinfo
name of display: /private/tmp/com.apple.launchd.vDdJxiOxqs/org.macosforge.xquartz:0
display: /private/tmp/com.apple.launchd.vDdJxiOxqs/org.macosforge.xquartz:0  screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
    GLX_ARB_multisample, GLX_EXT_import_context, GLX_EXT_visual_info, 
    GLX_EXT_visual_rating, GLX_OML_swap_method, GLX_SGIS_multisample, 
    GLX_SGIX_fbconfig
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
client glx extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_profile, 
    GLX_ARB_create_context_robustness, GLX_ARB_fbconfig_float, 
    GLX_ARB_framebuffer_sRGB, GLX_ARB_get_proc_address, GLX_ARB_multisample, 
    GLX_EXT_buffer_age, GLX_EXT_create_context_es2_profile, 
    GLX_EXT_fbconfig_packed_float, GLX_EXT_framebuffer_sRGB, 
    GLX_EXT_import_context, GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, 
    GLX_EXT_visual_rating, GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer, 
    GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer, 
    GLX_MESA_swap_control, GLX_OML_swap_method, GLX_OML_sync_control, 
    GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, 
    GLX_SGIX_visual_select_group, GLX_SGI_make_current_read, 
    GLX_SGI_swap_control, GLX_SGI_video_sync
GLX version: 1.4
GLX extensions:
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context, 
    GLX_EXT_visual_info, GLX_EXT_visual_rating, 
    GLX_MESA_multithread_makecurrent, GLX_OML_swap_method, 
    GLX_SGIS_multisample, GLX_SGIX_fbconfig
OpenGL vendor string: Intel
OpenGL renderer string: Intel(R) Iris(TM) Graphics 6100
OpenGL version string: 2.1 INTEL-10.6.33
OpenGL shading language version string: 1.20

Paraview 5.0.0 works on my local Mac, but I am not 100% sure, whether it is using OpenGL2.
Somehow the paraview.org website is not responding right now, so I can’t download 5.0.1 and
give it another try.

---
I also get a segmentation fault if I run with just X-Forwarding in a regular SSH connection, without
any further information:
$ paraview
Segmentation fault (core dumped)

---
If I run in a x2go session, I get:
$ paraview
failed to get the current screen resources
QXcbConnection: XCB error: 172 (Unknown), sequence: 166, resource id: 163, major code: 149 (Unknown), minor code: 20
Segmentation fault (core dumped)

(Where I believe the XCB error is unrelated.)

---
If I run paraview in a vglconnect session without x2go, I get the same error as within the x2go session:

$ vglrun paraview
ERROR: In /home/gk772/abs/paraview/src/ParaView-v5.0.1-source/VTK/Rendering/OpenGL2/vtkOpenGLRenderWindow.cxx, line 575
vtkXOpenGLRenderWindow (0x3673960): GLEW could not be initialized.

ERROR: In /home/gk772/abs/paraview/src/ParaView-v5.0.1-source/VTK/Rendering/OpenGL2/vtkShaderProgram.cxx, line 399
vtkShaderProgram (0x36651f0): Shader object was not initialized, cannot attach it.

Segmentation fault (core dumped)

> On Mon, Apr 11, 2016 at 9:56 AM, Ken Martin <ken.martin at kitware.com> wrote:
> As I understand it VirtualGL should transparently forward OpenGL/GLX/etc calls from the server to the client so that the client GPU is used. So my guess would be to first try running PV on the client and see if it works. If that seems to work fine then you know your client graphics supports PVs use of OpenGL and the issue could be in VirtualGL or some PV/VirtualGL interaction.
I am always confused with this server and client terminology in the X context.
The remote machine, where I try to run paraview on has a relatively strong nVidia graphics card,
which we would like to utilize via the virtualgl mechanism.
With the x2go we also try to keep the X-server on that box as much as possible, thus we have both,
the X-server and the paraview application running there. As far as I understand it, the graphics
capabilities of my local laptop should not really matter that much in this scenario.
I probably should try and run paraview on the box itself, but as I said above, it is not that easily
accessible.

Thanks a lot!
Harald