| Summary: | all OpenGL application with feenableexcept(FE_DIVBYZERO|FE_OVERFLOW|FE_INVALID) raise SIGFPE | ||
|---|---|---|---|
| Product: | Mesa | Reporter: | Jan Bertran <joanbe> |
| Component: | Drivers/DRI/i965 | Assignee: | Ian Romanick <idr> |
| Status: | RESOLVED DUPLICATE | QA Contact: | Intel 3D Bugs Mailing List <intel-3d-bugs> |
| Severity: | normal | ||
| Priority: | medium | CC: | pinguin255 |
| Version: | 11.2 | ||
| Hardware: | x86-64 (AMD64) | ||
| OS: | Linux (All) | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: | gdb backtrace | ||
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Created attachment 124210 [details] gdb backtrace After Ubuntu upgraded to Mesa 11.2 all OpenGL applications with floating point exceptions enabled (FE_INVALID) raise a SIGFPE signal at the first drawing command. Oibaf Mesa 11.3-git ppa as of (31-may-2016) also shows this behavior. To test it's necessary to patch glxgears. --- --- glxgears.c 2016-05-31 12:18:57.175490491 +0200 +++ glxgears_fpe.c 2016-05-31 12:28:30.854798058 +0200 @@ -37,6 +37,9 @@ #include <GL/glx.h> #include <GL/glxext.h> +#define __USE_GNU +#include <fenv.h> + #ifndef GLX_MESA_swap_control #define GLX_MESA_swap_control 1 typedef int (*PFNGLXGETSWAPINTERVALMESAPROC)(void); @@ -731,6 +734,8 @@ VisualID visId; int i; + feenableexcept(FE_DIVBYZERO | FE_OVERFLOW | FE_INVALID); + for (i = 1; i < argc; i++) { if (strcmp(argv[i], "-display") == 0) { dpyName = argv[i+1]; --- My guess line 301/302 has a 0 by 0 division unsigned hs_additional = (unsigned) round(hs_wants * (((double) remaining_space) / total_wants)); Probably it's really uncommon to enable exceptions as neither glxgears, tux racer, xonotic or web browsers or plasma desktop have this problem. But until now (Mesa 11.1), neither mesa-radeon or mesa-intel or nvidia-proprietary-blob had this issue.