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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - __cxa_allocate_exception returns under-aligned memory in 32 bit builds"
href="https://llvm.org/bugs/show_bug.cgi?id=24604">24604</a>
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<th>Summary</th>
<td>__cxa_allocate_exception returns under-aligned memory in 32 bit builds
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<th>Product</th>
<td>libc++abi
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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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>P
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>eric@efcs.ca
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>In 32 bit builds with GNU unwind __cxa_exception is 16 byte aligned. However
the maximal alignment in 32 bit builds is 8 bytes. That means that the memory
returned from std::malloc is not suitably aligned to represent a
__cxa_exception and this causes undefined behavior.
We need to figure out the best way to get over-aligned memory from
__cxa_allocate_exception.</pre>
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