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Bug 2709 - SDL_GL_CreateContext crashes/hangs when trying to create a context the gfx card doesn't support.
Summary: SDL_GL_CreateContext crashes/hangs when trying to create a context the gfx ca...
Status: RESOLVED INVALID
Alias: None
Product: SDL
Classification: Unclassified
Component: video (show other bugs)
Version: 2.0.3
Hardware: x86_64 Linux
: P2 critical
Assignee: Sam Lantinga
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2014-08-29 15:22 UTC by adam.e.skoglund
Modified: 2015-02-19 06:15 UTC (History)
1 user (show)

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Description adam.e.skoglund 2014-08-29 15:22:03 UTC 
SDL_GL_CreateContext crashes/hangs if I call:
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 4);
before the SDL_GL_CreateContext call.

My driver (on this machine) only supports 4.3.  I have no way of knowing the max version so I tried to create 4.4, should return null on error. Try 4.3 etc.
No luck. Crash instead.

Stacktrace:
0    __lll_lock_wait        135    0x7ffff707af2c   
1    _L_lock_909    /lib/x86_64-linux-gnu/libpthread.so.0        0x7ffff7076657   
2    __GI___pthread_mutex_lock        79    0x7ffff7076480   
3    ??    /usr/lib/x86_64-linux-gnu/libX11.so.6        0x7ffff5518973   
4    ??    /usr/lib/fglrx/libGL.so.1        0x7ffff6585e96   
5    ??    /usr/lib/fglrx/dri/fglrx_dri.so        0x7fffef9f1ede   
6    ??    /usr/lib/fglrx/libGL.so.1        0x7ffff6559b02   
7    glXDestroyContext    /usr/lib/fglrx/libGL.so.1        0x7ffff6559d0c   
8    X11_GL_CreateContext    SDL_x11opengl.c    667    0x1107d9b   
9    SDL_GL_CreateContext_REAL    SDL_video.c    2893    0x107b11c   
10    bitsquid::gl::new_context    gl_platform_linux.cpp    217    0xcb684c   


                    } else {
                        context =
                            glXCreateContextAttribs(display,
                                                    framebuffer_config[0],
                                                    share_context, True, attribs);
this line ------>                        _this->gl_data->glXDestroyContext(display,
                                                          temp_context);
                    }
                }

AMD 5770 card. Ubuntu 14.04  64 bit.
Comment 1 Ryan C. Gordon 2015-02-19 06:15:08 UTC 
This is a known bug in AMD's OpenGL drivers. We've just made some fixes to SDL that might mitigate this, but it's definitely AMD's bug.

--ryan.