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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - -O2 -fstack-clash-protection alloca(0) SEGV"
href="https://bugs.llvm.org/show_bug.cgi?id=47657">47657</a>
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<th>Summary</th>
<td>-O2 -fstack-clash-protection alloca(0) SEGV
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>jan.kratochvil@redhat.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>echo -e '#include <alloca.h>\n#include <stdint.h>\nlong size;int main() {return
(uintptr_t)alloca(size);}'|clang -O2 -fstack-clash-protection -Wall -x c++
-;./a.out
Segmentation fault
FAIL: clang-11.0.0-0.3.rc2.fc34.x86_64
FAIL: c6c5629f2fb4ddabd376fbe7c218733283e91d09 = 2020-09-25
PASS: gcc-10.2.1-4.fc34.x86_64</pre>
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