<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/57493>57493</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang crashes on valid code at -O3 with -fopenmp: Assertion `DeadSCC && DeadSCC->size() == 1 && &DeadSCC->begin()->getFunction() == DeadFn' failed 
        </td>
    </tr>

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

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

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

<pre>
    ```
[521] % clangtk -v
clang version 16.0.0 (https://github.com/llvm/llvm-project.git 6e47ebdcec770f12fe684261cb23f099277bc8f1)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /local/suz-local/opfuzz/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/11
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/11
Candidate multilib: .;@m64
Selected multilib: .;@m64
[522] % 
[522] % clangtk -O3 small.c; ./a.out
[523] % clangtk -O2 -fopenmp small.c; ./a.out
[524] % 
[524] % clangtk -O3 -fopenmp small.c
clang-16: /local/suz-local/software/clangbuild/llvm-project/llvm/lib/Transforms/Utils/CallGraphUpdater.cpp:60: bool llvm::CallGraphUpdater::finalize(): Assertion `DeadSCC && DeadSCC->size() == 1 && &DeadSCC->begin()->getFunction() == DeadFn' failed.
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: /local/suz-local/software/local/clang-trunk/bin/clang-16 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj --mrelax-relocations -disable-free -clear-ast-before-backend -main-file-name small.c -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=none -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -mllvm -treat-scalable-fixed-error-as-warning -debugger-tuning=gdb -fcoverage-compilation-dir=/local/suz-local/software/emitesting/bugs/20220831-clangtk-m64-O3-mllvm-polly-fopenmp-Weverything-pipe-fPIC-build-181608/delta -resource-dir /local/suz-local/software/local/clang-trunk/lib/clang/16.0.0 -I /usr/local/include/csmith -I /local/suz-local/software/local/include -internal-isystem /local/suz-local/software/local/clang-trunk/lib/clang/16.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/11/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O3 -fdebug-compilation-dir=/local/suz-local/software/emitesting/bugs/20220831-clangtk-m64-O3-mllvm-polly-fopenmp-Weverything-pipe-fPIC-build-181608/delta -ferror-limit 19 -fopenmp -fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/small-3e29a1.o -x c small.c
1.      <eof> parser at end of file
2.      Optimizer
 #0 0x0000563d45b4bec1 PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
 #1 0x0000563d45b495b4 SignalHandler(int) Signals.cpp:0:0
 #2 0x00007efd4dc21980 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12980)
 #3 0x00007efd4c84ee87 raise /build/glibc-CVJwZb/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #4 0x00007efd4c8507f1 abort /build/glibc-CVJwZb/glibc-2.27/stdlib/abort.c:81:0
 #5 0x00007efd4c8403fa __assert_fail_base /build/glibc-CVJwZb/glibc-2.27/assert/assert.c:89:0
 #6 0x00007efd4c840472 (/lib/x86_64-linux-gnu/libc.so.6+0x30472)
 #7 0x0000563d45b8a0fb llvm::CallGraphUpdater::finalize() (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x3ea20fb)
 #8 0x0000563d45452b0a llvm::OpenMPOptCGSCCPass::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x376ab0a)
 #9 0x0000563d4700ab92 llvm::detail::PassModel<llvm::LazyCallGraph::SCC, llvm::OpenMPOptCGSCCPass, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x5322b92)
#10 0x0000563d448c57a9 llvm::PassManager<llvm::LazyCallGraph::SCC, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x2bdd7a9)
#11 0x0000563d453ec252 llvm::detail::PassModel<llvm::LazyCallGraph::SCC, llvm::PassManager<llvm::LazyCallGraph::SCC, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x3704252)
#12 0x0000563d448ca030 llvm::DevirtSCCRepeatedPass::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x2be2030)
#13 0x0000563d453ec202 llvm::detail::PassModel<llvm::LazyCallGraph::SCC, llvm::DevirtSCCRepeatedPass, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x3704202)
#14 0x0000563d448c7a53 llvm::ModuleToPostOrderCGSCCPassAdaptor::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x2bdfa53)
#15 0x0000563d453ec2f2 llvm::detail::PassModel<llvm::Module, llvm::ModuleToPostOrderCGSCCPassAdaptor, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x37042f2)
#16 0x0000563d452ada98 llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x35c5a98)
#17 0x0000563d453f2748 llvm::ModuleInlinerWrapperPass::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x370a748)
#18 0x0000563d46e99c82 llvm::detail::PassModel<llvm::Module, llvm::ModuleInlinerWrapperPass, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x51b1c82)
#19 0x0000563d452ada98 llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x35c5a98)
#20 0x0000563d45effbb0 (anonymous namespace)::EmitAssemblyHelper::RunOptimizationPipeline(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>&, std::unique_ptr<llvm::ToolOutputFile, std::default_delete<llvm::ToolOutputFile>>&) BackendUtil.cpp:0:0
#21 0x0000563d45f021b6 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef, llvm::Module*, clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x421a1b6)
#22 0x0000563d46e0e832 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x5126832)
#23 0x0000563d47e93319 clang::ParseAST(clang::Sema&, bool, bool) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x61ab319)
#24 0x0000563d466bde21 clang::FrontendAction::Execute() (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x49d5e21)
#25 0x0000563d466449ee clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x495c9ee)
#26 0x0000563d467859e8 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x4a9d9e8)
#27 0x0000563d4306f90d cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x138790d)
#28 0x0000563d43069493 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
#29 0x0000563d4306bf56 clang_main(int, char**) (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x1383f56)
#30 0x00007efd4c831c87 __libc_start_main /build/glibc-CVJwZb/glibc-2.27/csu/../csu/libc-start.c:344:0
#31 0x0000563d4306866a _start (/local/suz-local/software/local/clang-trunk/bin/clang-16+0x138066a)
clang-16: error: unable to execute command: Aborted
clang-16: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 16.0.0 (https://github.com/llvm/llvm-project.git 6e47ebdcec770f12fe684261cb23f099277bc8f1)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /local/suz-local/opfuzz/bin
clang-16: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-16: note: diagnostic msg: /tmp/small-b80a68.c
clang-16: note: diagnostic msg: /tmp/small-b80a68.sh
clang-16: note: diagnostic msg: 

********************
[525] % 
[525] % cat small.c
int a, b, c, d, e, f, g, h, i, j;
int k(int l, int m) { return m; }
void n(int l) {}
static int o(int l);
void p(int u);
static int q() {
  if (a)
    for (; b; b++)
      for (; f; f++)
        for (; e; e++)
          n(d);
  j = o(0);
  while (h++) {
    c = k(c, 1);
    while (c)
      ;
  }
  return 0;
}
int o(int l) {
  while (g) {
    q();
    while (1)
      q();
  }
  p(0);
  return 0;
}
void p(int l) {
  for (l = 0; l != 7; l = k(l, 1))
    ;
  o(i);
}
int main() {
  if (a)
    p(0);
  return 0;
}
```
</pre>
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