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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - -fmodules crashes CodeGenModule::getMangledName(), called recursively"
href="https://bugs.llvm.org/show_bug.cgi?id=33810">33810</a>
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<th>Summary</th>
<td>-fmodules crashes CodeGenModule::getMangledName(), called recursively
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<th>Product</th>
<td>clang
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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
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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>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>geek4civic@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre><a href="http://lab.llvm.org:8011/builders/clang-x86_64-linux-selfhost-modules/builds/7503">http://lab.llvm.org:8011/builders/clang-x86_64-linux-selfhost-modules/builds/7503</a>
<a href="http://bb.pgr.jp/builders/bootstrap-clang-libcxx-lld-i686-linux">http://bb.pgr.jp/builders/bootstrap-clang-libcxx-lld-i686-linux</a>
r308041 (and r308040) began crashing.
As far as I investigated, lazily-resolved decls would call
CodeGenModule::getMangledName() recursively, but it is not re-entrant.
StringRef &FoundStr = MangledDeclNames[CanonicalGD];
if (!FoundStr.empty())
return FoundStr;
...
return FoundStr = Result.first->first();
When (MapVector)MangledDeclName grew (realloc), &FoundStr might not point valid
element, to cause memory corruption.
I think;
return MangledDeclNames[CanonicalGD] = Result.first->first();
would work, but I'm not sure it'd be the right resolution.</pre>
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