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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [d3d9] D3D9 state tracker crashes due to stack misalignment if Mesa is compiled with -mfpmath=sse"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91039">91039</a>
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<th>Summary</th>
<td>[d3d9] D3D9 state tracker crashes due to stack misalignment if Mesa is compiled with -mfpmath=sse
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<th>Product</th>
<td>Mesa
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<th>Version</th>
<td>10.6
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>Mesa core
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
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<th>Reporter</th>
<td>xamaniqinqu@gmail.com
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
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<pre>Description:
The "Nine" D3D9 state tracker crashes when Wine loads any D3D program if Mesa
is compiled with -mfpmath=sse. This is because the Linux ABI assumes a stack
alignment to 16 bytes, whereas the Win32 ABI assumes a stack alignment to 4
bytes. This causes a stack misalignment and thus a general protection fault.
Additional information:
Also see the following external bug reports:
<a href="https://bugs.winehq.org/show_bug.cgi?id=22475">https://bugs.winehq.org/show_bug.cgi?id=22475</a>
<a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838</a>
Specifications:
OS: Gentoo GNU/Linux x86_64
Kernel version: Linux 4.0.4-hardened-r3
Mesa version: 10.6.0
Solution:
The crashes no longer occur when Mesa's stack is realigned to 4 bytes.
Therefore, always pass -mstackrealign to CFLAGS if -mfpmath=sse is enabled;
this should probably be handled in the configure script.</pre>
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