<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/70590>70590</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang crash: Assertion `Val && "isa<> used on a null pointer"' failed. (since Clang-17)
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          shao-hua-li
      </td>
    </tr>
</table>

<pre>
    clang at -Os crashes on the test case.

Bisected to 0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3, which was committed by @fhahn 

Compiler explorer: https://godbolt.org/z/WfzxYoeK3

```console
% cat a.c
static char a;
static char *b = &a;
char c[] = {1, 1, 1, 1, 1};
static long d;
int e;
short f[1];
void g() {
  for (;;) {
    char **h = &b;
    char ***i[4] = {&h};
    d = 1;
    for (; d <= 4; d++)
 e = f[d] && c[1049763837 % *b + (int)3245203467*2 + 1049763821 + d];
 }
}
int main() {}
%
% clang -Os a.c
clang-17: /tmp/tmpfaiqo1f_/tmptk29ij84/llvm/include/llvm/Support/Casting.h:109: static bool llvm::isa_impl_cl<To, const From*>::doit(const From*) [with To = llvm::Instruction; From = llvm::Value]: Assertion `Val && "isa<> used on a null pointer"' 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: /zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/clang-17 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -disable-free -clear-ast-before-backend -main-file-name reduced.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 -debugger-tuning=gdb -fcoverage-compilation-dir=/zdata/shaoli/realsmith/watchdir/reduced/case_cuUdmpg2 -resource-dir /zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/lib/clang/17 -internal-isystem /zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/lib/clang/17/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 -Os -fdebug-compilation-dir=/zdata/shaoli/realsmith/watchdir/reduced/case_cuUdmpg2 -ferror-limit 19 -fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/reduced-c4da0e.o -x c a.c
1.      <eof> parser at end of file
2. Optimizer
 #0 0x00007f6cf88efeef llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libLLVM-17git.so+0x88feef)
 #1 0x00007f6cf88ed614 SignalHandler(int) Signals.cpp:0:0
 #2 0x00007f6cf7c75090 (/lib/x86_64-linux-gnu/libc.so.6+0x43090)
 #3 0x00007f6cf7c7500b raise /build/glibc-BHL3KM/glibc-2.31/signal/../sysdeps/unix/sysv/linux/raise.c:51:1
 #4 0x00007f6cf7c54859 abort /build/glibc-BHL3KM/glibc-2.31/stdlib/abort.c:81:7
 #5 0x00007f6cf7c54729 get_sysdep_segment_value /build/glibc-BHL3KM/glibc-2.31/intl/loadmsgcat.c:509:8
 #6 0x00007f6cf7c54729 _nl_load_domain /build/glibc-BHL3KM/glibc-2.31/intl/loadmsgcat.c:970:34
 #7 0x00007f6cf7c65fd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
 #8 0x00007f6cfa2a68f5 (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libLLVM-17git.so+0x22468f5)
 #9 0x00007f6cfa2b013f llvm::InnerLoopVectorizer::collectPoisonGeneratingRecipes(llvm::VPTransformState&)::'lambda'(llvm::VPRecipeBase*)::operator()(llvm::VPRecipeBase*) const (.isra.0) LoopVectorize.cpp:0:0
#10 0x00007f6cfa2ca0ea llvm::InnerLoopVectorizer::collectPoisonGeneratingRecipes(llvm::VPTransformState&) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libLLVM-17git.so+0x226a0ea)
#11 0x00007f6cfa2f7f28 llvm::LoopVectorizationPlanner::executePlan(llvm::ElementCount, unsigned int, llvm::VPlan&, llvm::InnerLoopVectorizer&, llvm::DominatorTree*, bool) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libLLVM-17git.so+0x2297f28)
#12 0x00007f6cfa2fa5a2 llvm::LoopVectorizePass::processLoop(llvm::Loop*) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libLLVM-17git.so+0x229a5a2)
#13 0x00007f6cfa2fce2d llvm::LoopVectorizePass::runImpl(llvm::Function&, llvm::ScalarEvolution&, llvm::LoopInfo&, llvm::TargetTransformInfo&, llvm::DominatorTree&, llvm::BlockFrequencyInfo*, llvm::TargetLibraryInfo*, llvm::DemandedBits&, llvm::AssumptionCache&, llvm::LoopAccessInfoManager&, llvm::OptimizationRemarkEmitter&, llvm::ProfileSummaryInfo*) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libLLVM-17git.so+0x229ce2d)
#14 0x00007f6cfa2fe050 llvm::LoopVectorizePass::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libLLVM-17git.so+0x229e050)
#15 0x00007f6cfb67d116 llvm::detail::PassModel<llvm::Function, llvm::LoopVectorizePass, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libLLVM-17git.so+0x361d116)
#16 0x00007f6cfef7fbc5 llvm::detail::PassModel<llvm::Function, llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libclang-cpp.so.17git+0x2029bc5)
#17 0x00007f6cf8aeab40 llvm::ModuleToFunctionPassAdaptor::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libLLVM-17git.so+0xa8ab40)
#18 0x00007f6cfef6cec6 llvm::detail::PassModel<llvm::Module, llvm::ModuleToFunctionPassAdaptor, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libclang-cpp.so.17git+0x2016ec6)
#19 0x00007f6cf8ae873d llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libLLVM-17git.so+0xa8873d)
#20 0x00007f6cfef8104d (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 0x00007f6cfef841a9 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, 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>>) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libclang-cpp.so.17git+0x202e1a9)
#22 0x00007f6cff40a12c clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libclang-cpp.so.17git+0x24b412c)
#23 0x00007f6cfdaa27f9 clang::ParseAST(clang::Sema&, bool, bool) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libclang-cpp.so.17git+0xb4c7f9)
#24 0x00007f6cff408a68 clang::CodeGenAction::ExecuteAction() (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libclang-cpp.so.17git+0x24b2a68)
#25 0x00007f6cfffe5c79 clang::FrontendAction::Execute() (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libclang-cpp.so.17git+0x308fc79)
#26 0x00007f6cfff657d6 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libclang-cpp.so.17git+0x300f7d6)
#27 0x00007f6d0007c977 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/../lib/libclang-cpp.so.17git+0x3126977)
#28 0x0000556a0177e27e cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/clang-17+0x1627e)
#29 0x0000556a0177a30a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#30 0x0000556a0177b83c clang_main(int, char**, llvm::ToolContext const&) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/clang-17+0x1383c)
#31 0x0000556a01774fd5 main (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/clang-17+0xcfd5)
#32 0x00007f6cf7c56083 __libc_start_main /build/glibc-BHL3KM/glibc-2.31/csu/../csu/libc-start.c:342:3
#33 0x0000556a0177501e _start (/zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin/clang-17+0xd01e)
clang: error: unable to execute command: Aborted
clang: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 17.0.0 (https://github.com/llvm/llvm-project.git 0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /zdata/shaoli/compilers/ccbuilder-compilers/clang-0d61ffd350a5d5367ee2f35ee5a98223aa8e6be3/bin
clang: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/reduced-43943f.c
clang: note: diagnostic msg: /tmp/reduced-43943f.sh
clang: note: diagnostic msg:

********************
%
```
</pre>
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