https://bugs.freedesktop.org/show_bug.cgi?id=43522
Bug #: 43522 Summary: matrixview segfaults because of _tnl_emit_vertices_to_buffer heap corruption Classification: Unclassified Product: Mesa Version: 7.11 Platform: x86 (IA32) OS/Version: Linux (All) Status: NEW Severity: normal Priority: medium Component: Drivers/DRI/Savage AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: bugzi11.fdo.tormod@xoxy.net
Created attachment 54114 --> https://bugs.freedesktop.org/attachment.cgi?id=54114 gdb session with backtrace from corruption
The matrixview screensaver hack from rss-glx (Really Slick Screensavers Port to GLX) segfaults very reproducibly on my savage laptop. The _swrast_context->InvalidateState function pointer gets overwritten and _swrast_InvalidateState segfaults.
I have tracked this down to emit_viewport4_bgra4_st2() from src/mesa/tnl/t_vertex_generic.c (see attached gdb session).
This happens with or without MESA_NO_CODEGEN=1 but gdb made more sense with it.