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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 - [dfsan] Failing test when libcxx is built with DFSan"
href="https://bugs.llvm.org/show_bug.cgi?id=45621">45621</a>
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<th>Summary</th>
<td>[dfsan] Failing test when libcxx is built with DFSan
</td>
</tr>
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<th>Product</th>
<td>libc++
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>zbrid@google.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
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<p>
<div>
<pre>Commands I Ran
```
cmake -GNinja ../llvm-project/llvm -DCMAKE_BUILD_TYPE=RELWITHDEBINFO
-DCMAKE_C_COMPILER=~/repos/clang-build/bin/clang
-DCMAKE_CXX_COMPILER=~/repos/clang-build/bin/clang++
-DLLVM_USE_SANITIZER="DataFlow" -DLLVM_ENABLE_LIBCXX=ON
-DLLVM_ENABLE_PROJECTS="libcxx;libcxxabi"
ninja cxx cxxabi
ninja check-cxx
```
Expected: All tests pass
Actual results
```
Unexpected failures
libcxx/atomics/atomics.align/align.pass.sh.cpp
std/strings/string.conversions/stoull.pass.cpp
std/utilities/charconv/charconv.to.chars/integral.pass.cpp
std/utilities/tuple/tuple.tuple/tuple.apply/apply_large_arity.pass.cpp
```
Run the tests individually with these commands
```
cd libcxx-dfsan-build/
./bin/llvm-lit -sv
../llvm-project/libcxx/test/libcxx/atomics/atomics.align/align.pass.sh.cpp
./bin/llvm-lit -sv
../llvm-project/libcxx/test/std/strings/string.conversions/stoull.pass.cpp
./bin/llvm-lit -sv
../llvm-project/libcxx/test/std/utilities/charconv/charconv.to.chars/integral.pass.cpp
../llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.apply/apply_large_arity.pass.cpp
```
These failures look like miscompiles and are likely issues with DFSan.</pre>
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