From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 43522] New: matrixview segfaults because of _tnl_emit_vertices_to_buffer heap corruption
Date: Sun, 04 Dec 2011 21:49:54 +0000 [thread overview]
Message-ID: <bug-43522-502@http.bugs.freedesktop.org/> (raw)
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.
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