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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - all OpenGL application with feenableexcept(FE_DIVBYZERO|FE_OVERFLOW|FE_INVALID) raise SIGFPE"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96289">96289</a>
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<th>Summary</th>
<td>all OpenGL application with feenableexcept(FE_DIVBYZERO|FE_OVERFLOW|FE_INVALID) raise SIGFPE
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>11.2
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Drivers/DRI/i965
</td>
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<th>Assignee</th>
<td>idr@freedesktop.org
</td>
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<th>Reporter</th>
<td>joanbe@gmail.com
</td>
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
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</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=124210" name="attach_124210" title="gdb backtrace">attachment 124210</a> <a href="attachment.cgi?id=124210&action=edit" title="gdb backtrace">[details]</a></span>
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.</pre>
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