[llvm-bugs] [Bug 45621] New: [dfsan] Failing test when libcxx is built with DFSan

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45621

            Bug ID: 45621
           Summary: [dfsan] Failing test when libcxx is built with DFSan
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: zbrid at google.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

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.

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