<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/139869>139869</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [nsan] nsan pass failure on long autogenerated C++ file
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          hageboeck
      </td>
    </tr>
</table>

<pre>
    When running the attached preprocessed C++ file, the nsan pass fails as below.
I don't know if this helps, but It passes OK when I remove `-O2 -g`.

```
$ clang++-20 -fsanitize=numerical -pipe -pthread -O2 -g -DNDEBUG -fno-omit-frame-pointer -std=c++20 -fPIC -o /tmp/repro.cxx.o -x c++-cpp-output -c /tmp/repro.cxx.i 

PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments: clang++-20 -fsanitize=numerical -pipe -pthread -O2 -g -DNDEBUG -fno-omit-frame-pointer -std=c++20 -fPIC -o /tmp/repro.cxx.o -x c++-cpp-output -c /tmp/repro.cxx.i
1.      <eof> parser at end of file
2.      Optimizer
3.      Running pass "nsan" on module "/home/stephan/code/root-nsan/graf2d/gpadv7/G__ROOTGpadv7.cxx"

 #0 0x00007fe9df7f0ae3 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/llvm/20/bin/../lib64/libLLVM.so.20.1+0xbf0ae3)
 #1 0x00007fe9df7ee0c5 llvm::sys::RunSignalHandlers() (/usr/lib/llvm/20/bin/../lib64/libLLVM.so.20.1+0xbee0c5)
 #2 0x00007fe9df7009c8 (/usr/lib/llvm/20/bin/../lib64/libLLVM.so.20.1+0xb009c8)
 #3 0x00007fe9de662f50 (/usr/lib64/libc.so.6+0x3df50)
 #4 0x00007fe9e09e0b67 (/usr/lib/llvm/20/bin/../lib64/libLLVM.so.20.1+0x1de0b67)
 #5 0x00007fe9e09e0d00 (/usr/lib/llvm/20/bin/../lib64/libLLVM.so.20.1+0x1de0d00)
 #6 0x00007fe9e09e0d00 (/usr/lib/llvm/20/bin/../lib64/libLLVM.so.20.1+0x1de0d00)
 #7 0x00007fe9e09e3773 (/usr/lib/llvm/20/bin/../lib64/libLLVM.so.20.1+0x1de3773)
 #8 0x00007fe9e09eb23c llvm::NumericalStabilitySanitizerPass::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/usr/lib/llvm/20/bin/../lib64/libLLVM.so.20.1+0x1deb23c)
 #9 0x00007fe9e9b0f486 (/usr/lib/llvm/20/bin/../lib64/libclang-cpp.so.20.1+0x1f0f486)
#10 0x00007fe9df9d56a1 llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/usr/lib/llvm/20/bin/../lib64/libLLVM.so.20.1+0xdd56a1)
#11 0x00007fe9e9b2511c (/usr/lib/llvm/20/bin/../lib64/libclang-cpp.so.20.1+0x1f2511c)
#12 0x00007fe9e9b28e19 clang::emitBackendOutput(clang::CompilerInstance&, clang::CodeGenOptions&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>, clang::BackendConsumer*) (/usr/lib/llvm/20/bin/../lib64/libclang-cpp.so.20.1+0x1f28e19)
#13 0x00007fe9e9fb7f62 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/usr/lib/llvm/20/bin/../lib64/libclang-cpp.so.20.1+0x23b7f62)
#14 0x00007fe9e85d837c clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib/llvm/20/bin/../lib64/libclang-cpp.so.20.1+0x9d837c)
#15 0x00007fe9ea9894e2 clang::FrontendAction::Execute() (/usr/lib/llvm/20/bin/../lib64/libclang-cpp.so.20.1+0x2d894e2)
#16 0x00007fe9ea90f687 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/lib/llvm/20/bin/../lib64/libclang-cpp.so.20.1+0x2d0f687)
#17 0x00007fe9eaa110f7 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/lib/llvm/20/bin/../lib64/libclang-cpp.so.20.1+0x2e110f7)
#18 0x0000563fe6b7dbbd cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/lib/llvm/20/bin/clang-20+0x17bbd)
#19 0x0000563fe6b781c3 (/usr/lib/llvm/20/bin/clang-20+0x121c3)
#20 0x00007fe9ea51ac65 (/usr/lib/llvm/20/bin/../lib64/libclang-cpp.so.20.1+0x291ac65)
#21 0x00007fe9df700aba llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/usr/lib/llvm/20/bin/../lib64/libLLVM.so.20.1+0xb00aba)
#22 0x00007fe9ea51d395 clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (/usr/lib/llvm/20/bin/../lib64/libclang-cpp.so.20.1+0x291d395)
#23 0x00007fe9ea4d7f66 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/usr/lib/llvm/20/bin/../lib64/libclang-cpp.so.20.1+0x28d7f66)
#24 0x00007fe9ea4d83f8 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/usr/lib/llvm/20/bin/../lib64/libclang-cpp.so.20.1+0x28d83f8)
#25 0x00007fe9ea4ec91b clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/usr/lib/llvm/20/bin/../lib64/libclang-cpp.so.20.1+0x28ec91b)
#26 0x0000563fe6b799c8 clang_main(int, char**, llvm::ToolContext const&) (/usr/lib/llvm/20/bin/clang-20+0x139c8)
#27 0x0000563fe6b76613 main (/usr/lib/llvm/20/bin/clang-20+0x10613)
#28 0x00007fe9de64c4d8 (/usr/lib64/libc.so.6+0x274d8)
#29 0x00007fe9de64c59c __libc_start_main (/usr/lib64/libc.so.6+0x2759c)
#30 0x0000563fe6b76675 _start (/usr/lib/llvm/20/bin/clang-20+0x10675)

clang++-20: error: clang frontend command failed with exit code 139 (use -v to see invocation)
clang version 20.1.4
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm/20/bin
Configuration file: /etc/clang/20/x86_64-pc-linux-gnu-clang++.cfg
clang++-20: note: diagnostic msg: Error generating preprocessed source(s) - no preprocessable inputs.
```

I have to attach it as `.txt` to make github happy:
[repro.cxx.i.txt](https://github.com/user-attachments/files/20204721/repro.cxx.i.txt)


</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzUWV9v4zYS_zTMCyFDoqx_D3lQnHgvvW032KS9R4MiRzZvJVJHUo7TT38gZUeW42zb1C3ugAB2-GfmN78ZztAcaoxYS4BrlNyg5PaK9naj9PWGrqFSwL5dVYq_XP9rAxLrXkoh19huAFNrKdsAx52GTisGxgDHC0RuELnBtWgAkYVfKQ2VuKPG4JqKxmBqcAWNep6hsLzHXElEMou_SfWMRY3tRhi8gaYzbn_VW3xv_W4w-Ms_8bPDcY81tGoLGKVh8IXgYI3S0Ilzf2m4_wtLROaYNVSuB1QBCXFQGyqFFb8Cim9l34IWjDY46EQHOOjsRgPleBCKg9ufbu9ufv6Eg1qqQLXCBrWmLQSdEtKCxoGxHMW3bJDvxT_cL3CgMCJL23aILD07M7bbzRQOdni_NGBdF6jedr3FATu3WuDBnofPd-XjHTZ91QqLKa76NdbQKW2xVXhjbWdQXCKyRGS5FnbTVzOmWkSWTbM9fASdVv8GZhFZCmN6MIgsMZUcC8manoN3E9PUbHBF2TerKfPem7jWqF4Pw24nNUYxQS1wFxXYMC0661zwaCn7hnnfdg5WWDq_FA9arTVtMdXrvgVpHeT_X8-gsIycVShegKpRfIc7qg1oTC0GybGqh_gPS-KWfemsaMWvoFFYxm7g6_4Y-TOBCHEHBBGClcSt4n0DbhCR5Ua1gMjSWOg2bsWSKe4GtFI2GDYt15rWhLsvHeXbDJHlp9Xq65cvT5_8_w6wE-ZDCSMShzjchWEYZjUUvM7qkEKMfajEJYpL82KGLw9aSOt9-TREQz4u0vR5pYzVQFtEUhcRQlpECoxIjsiyN9rFnajGICQhIstKOMCz2TCZzofPz59_-XFm1IyEswiRm3BXeUyIFHvE0RQxQMiSc4i_9vJRrCVt_kElb0Abj-ZSoLzaERSZggrDguUX0uRljZriY02QpqROwlNNB2HMSUq9mJjXSThKmR9JgbCAsEqzy-CNuBc2qkpOVfHwDeCPq-LhkVXp36cqO1EVZ1l8MVVO2KgqP1FVkZgdBfxPh9T4aGklGmFfHvd5Uz9Qsz8MupeTI_ujzyv70zoOl5I2L0aYH6mka9AoXrzZEt_5XRc6RxH35ozGFsfGFlVYz_P0Q6p8NXHJe6qv9hIHfS6ZTPNfwZOURkeEOAa_Q8YHyHN__8se4Z6CkaBo6hCSRBG7qEO8xFEfOdGXQ1TsrwbeaGiFvaHsG0j-xVdlRPKj6YVqO9GAvpfGUskOhE5WcPgE0lVhJc0bwh-tFnL9Ferp8ME95Ym0PZSSOWnTLffS6t6ILXyFeiHtg516b1vvz-ZSNPD4Yiy03pUL7K8qbqaX4j89rLqTna7eds9aWFgdqu7RJg417Ru74tCAhd_YOATkWZMWShqXWrzNHwuud13unDq6PJ64vK6yOiXfA-QHh6r-pKk0DXXk_yzFSSyUj08LJS3s7J84IOdtILFHOdowKah5wvM4Y8c2PLgbYfn4NEX4CC3dR2ClVDN-XhJr4cGMUCcFmRZ5MYcJ3UvtSHuNaT92twPWW_gTV6h3eORe_QgunYIL6zTP8PfO9zG8wynM37fm4oHAPcTRgMnFgNIoCuuJAXuoox1bxehb2G_z2IVPIQEPbQR-uGYkaVxDWmW8qjhmLFq1VExLVak1fXEZMl6wDdWYKWmsA7hPJZMxssBbJfgfwD_gdQMuWWRVxUeQxQnIPGK_79o1FUoiFr8KJeHEZUlEWZpckunCSxz1Rac_FmhFj-rGwv3w_gpMbUG_HBLY608aWkPzMnFH3Usf2yvtXeLYHtAX3iGX-sXjYY5GkBPSeFwkx3HOtdgecvViES1U21LJT7PJ2aB6LWXK12jaTIrYWKBfi9frhtWK7XZRNPxTUSOYK3TCYfKhOlnsBlZWU2HNYfpEHG0adziVPpp3S8oxUfuo9sF-2YhxdI5kTyoknfOsTtN3yfaZg77J3QcPTNLMyUa34HB0T-9N31laTmrYX8BH7i0e-Zif8JHHdf5H-fhBVeZ9Mn5Q1Wdh7ISMoxhsadP8Aswqfd92zXHMdlS4cPEvIL-fv31g_dUsOp5GFqcXgTmwIqreQ3x79H1Sws7UrvfY_xtZvGilzD0zI2_pSREqCraPvkOtPOD2KafcJ4zR8Celmn1iPwqwj1TH-PVtyAHLToClaRRjB-kDksM0OiqR-fTVac7m_M371plXJ5LN-RG-4lRKUjC8Wrk9K2OptqtzYM_KTYrxRvv6iDnanSV4kPghy7ND6g3L6aM0iksMWruCsH-vxvX-fonZPhprKhrg-FnYDYadcB7mgKPYu7c3gIMttgobACyOLn_FQRnegjZCSewCcDZHYflE9RrcFQDv8nSVzoOOBY2Q_S5Yy97ND0_hreLQuFWdMmKHwtLfHZsG-K3wgH-Dh7BcKFmLda89pOHNetgGlh1oOuw4AyU4ImvG6vVZ-qSyXioXdC2VsYLh1rjDje8csXgNEhwAuT7fbsiNOykBluponlaNY7PrrZmd9nzC8h5v6BYc6UOTCguLqcEoDWd2Z1EauqmWfgM8NEzwhnbdy9CuQMnN0Uu_X5_cIpJ_p9HSG9DBoGnobZClo9J45kg4z0g07R94qYeAu-LXMS_igl7BdZS5xWmaZ1eb6zqhpErnCUQ0i3IWUcorWlBGSUVywqorcU1CkoRJNA-LJA-zWcE4gSibx3VdzXmSoXkILRXNzHl-pvT6ynd_rqO4yNPiqqEVNMa3_QiR8Iz9LCIEJbdX-to3jqp-bdA8bISxZhRjhW18v9A3IZLbkxZfrwEriRsl15j2Vu1dfNIevOp1c_3x_tXeiO01-W8AAAD__2cJitY">