[fglrx] X server dies when the unityshell plugin is loaded and GLSL is unavailable. glGetActiveAttribARB <- nux::IOpenGLShaderProgram::CheckAttributeLocation() <- nux::IOpenGLShaderProgram::Link

[Daniel van Vugt]

X server dies when unityshell is loaded with the latest Nux. I get sent back to the lightdm login screen :(

(gdb) bt
#0 __GI__exit (status=1) at ../sysdeps/unix/sysv/linux/_exit.c:29
#1 0x00007fffe93f72a6 in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
#2 0x00007ffff6d3c41e in _XIOError () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#3 0x00007ffff6d3a38b in _XReply () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#4 0x00007ffff253f8c8 in ?? () from /usr/lib/fglrx/libGL.so.1 (glGetActiveAttribARB)
#5 0x00007fffe9f88478 in nux::IOpenGLShaderProgram::CheckAttributeLocation (this=0x88d150) at ./IOpenGLGLSLShader.cpp:758
#6 0x00007fffe9f888b1 in nux::IOpenGLShaderProgram::Link (this=0x88d150) at ./IOpenGLGLSLShader.cpp:673
#7 0x00007fffe9f59fd0 in nux::FontRenderer::FontRenderer (this=0x88f9e0, graphics_engine=...) at ./FontRenderer.cpp:140
#8 0x00007fffe9f79c63 in nux::GraphicsEngine::GraphicsEngine (this=0x8813f0, GlWindow=..., create_rendering_data=224) at ./GraphicsEngine.cpp:236
#9 0x00007fffe9f72e78 in nux::GraphicsDisplay::CreateFromOpenGLWindow (this=0x87f590, X11Display=<optimised out>, X11Window=<optimised out>, OpenGLContext=<optimised out>)
    at ./GraphicsDisplayX11.cpp:684
#10 0x00007fffe9f6d0a6 in nux::DisplayAccessController::CreateFromForeignWindow (this=<optimised out>, X11Display=0x873010, X11Window=180, OpenGLContext=0x6589b0) at ./GLWindowManager.cpp:148
#11 0x00007fffea312aa0 in nux::WindowThread::ThreadCtor (this=0x872c40, X11Display=<optimised out>, X11Window=180, OpenGLContext=0x6589b0) at ./WindowThread.cpp:1108

[Daniel van Vugt (vanvugt)]

I've now tried going back to Nux 3.0 and Unity 6.0.0 and the crash still happens.

The only thing that does seem to work is to uninstall fglrx and use the radeon driver instead.

[Daniel van Vugt (vanvugt)]

And yes, precise worked perfectly on this machine with fglrx. That's using Unity 5.12 and Nux 2.0.

The crash only happens with the latest trunk builds of Unity 6.x / Nux 3.x. But whatever it is was introduced before Unity 6.0 and and Nux 3.0 were tagged, because I've tried Unity 6.0 + Nux 3.0 and the crash still occurs. But the precise installation works.

[Daniel van Vugt (vanvugt)]

Actually, looks like it's caused by bug 1026920. But even still, Nux should not crash if GLSL is unavailable.