<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/113187>113187</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang] Assertion `NumInitElements <= NumArrayElements' failed.
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang:codegen,
            crash-on-invalid,
            clang:frontend:fuzzer
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          yijan4845
      </td>
    </tr>
</table>

<pre>
    **This testcase is generated by a fuzzer.**

Compiler Explorer: [https://godbolt.org/z/ve9Yox5q5](https://godbolt.org/z/ve9Yox5q5)

This invalid code will crash on Clang Assertion Trunk:
```cpp
union { char a[]; } z = {};
union { char a[]; } z0 = {z.a[0]};
char keep(){
        return z0.a[0];
}
```

It seems that this goes back to clang-15.

Stack dump:
```
clang++: /root/llvm-project/clang/lib/CodeGen/CGExprAgg.cpp:512: void {anonymous}::AggExprEmitter::EmitArrayInit(clang::CodeGen::Address, llvm::ArrayType*, clang::QualType, clang::Expr*, llvm::ArrayRef<clang::Expr*>, clang::Expr*): Assertion `NumInitElements <= NumArrayElements' 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: /opt/compiler-explorer/clang-assertions-trunk/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics <source>
1.      <eof> parser at end of file
2.      Per-file LLVM IR generation
3.      <source>:2:21: Generating code for declaration 'z0'
 #0 0x0000000003bba5e8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bba5e8)
 #1 0x0000000003bb82ac llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bb82ac)
 #2 0x0000000003b05918 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x000076e422c42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x000076e422c969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x000076e422c42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x000076e422c287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x000076e422c2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x000076e422c39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x00000000043c1c64 (anonymous namespace)::AggExprEmitter::EmitArrayInit(clang::CodeGen::Address, llvm::ArrayType*, clang::QualType, clang::Expr*, llvm::ArrayRef<clang::Expr*>, clang::Expr*) CGExprAgg.cpp:0:0
#10 0x00000000043c750f (anonymous namespace)::AggExprEmitter::VisitCXXParenListOrInitListExpr(clang::Expr*, llvm::ArrayRef<clang::Expr*>, clang::FieldDecl*, clang::Expr*) CGExprAgg.cpp:0:0
#11 0x00000000043c5900 (anonymous namespace)::AggExprEmitter::Visit(clang::Expr*) CGExprAgg.cpp:0:0
#12 0x00000000043c612c clang::CodeGen::CodeGenFunction::EmitAggExpr(clang::Expr const*, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x43c612c)
#13 0x00000000043c8678 (anonymous namespace)::AggExprEmitter::VisitCXXParenListOrInitListExpr(clang::Expr*, llvm::ArrayRef<clang::Expr*>, clang::FieldDecl*, clang::Expr*) CGExprAgg.cpp:0:0
#14 0x00000000043c5900 (anonymous namespace)::AggExprEmitter::Visit(clang::Expr*) CGExprAgg.cpp:0:0
#15 0x00000000043c612c clang::CodeGen::CodeGenFunction::EmitAggExpr(clang::Expr const*, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x43c612c)
#16 0x000000000436f4d4 clang::CodeGen::CodeGenFunction::EmitCXXGlobalVarDeclInit(clang::VarDecl const&, llvm::GlobalVariable*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x436f4d4)
#17 0x0000000004370050 clang::CodeGen::CodeGenFunction::GenerateCXXGlobalVarDeclInitFunc(llvm::Function*, clang::VarDecl const*, llvm::GlobalVariable*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4370050)
#18 0x0000000004370451 clang::CodeGen::CodeGenModule::EmitCXXGlobalVarDeclInitFunc(clang::VarDecl const*, llvm::GlobalVariable*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4370451)
#19 0x0000000003fe03a3 clang::CodeGen::CodeGenModule::EmitGlobalVarDefinition(clang::VarDecl const*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3fe03a3)
#20 0x0000000004003129 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4003129)
#21 0x000000000400f0dd clang::CodeGen::CodeGenModule::EmitDeferred() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x400f0dd)
#22 0x00000000040111f3 clang::CodeGen::CodeGenModule::Release() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x40111f3)
#23 0x0000000004531b1e (anonymous namespace)::CodeGeneratorImpl::HandleTranslationUnit(clang::ASTContext&) ModuleBuilder.cpp:0:0
#24 0x000000000452f775 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x452f775)
#25 0x000000000667a08c clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x667a08c)
#26 0x000000000452ff28 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x452ff28)
#27 0x00000000047eb1e9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47eb1e9)
#28 0x0000000004769cde clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4769cde)
#29 0x00000000048d08be clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48d08be)
#30 0x0000000000cde37f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcde37f)
#31 0x0000000000cd607a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#32 0x0000000004573c49 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#33 0x0000000003b05dc4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b05dc4)
#34 0x000000000457423f clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#35 0x0000000004539b3d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4539b3d)
#36 0x000000000453ac2d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x453ac2d)
#37 0x0000000004542555 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4542555)
#38 0x0000000000cdb23f clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcdb23f)
#39 0x0000000000baa334 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xbaa334)
#40 0x000076e422c29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#41 0x000076e422c29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#42 0x0000000000cd5b2e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd5b2e)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzkWk1z2zjS_jXwBUUVCX4ffJBlK2-mMjN5Y28qe1KBJEhhAgFcAHRk__otAJQtUFJiZ63ZqZ2U4pIAdPfTDxqNJgisFO04IZcgvQLp9QUe9FrIywf6B-ZJkaQXlWgeLgGaAzS_W1MFNVG6xopAqmBHOJFYkwZWDxDDdnh8JHLmBoPwGoTj34XY9JQRCW-2PROSSBDPIUiv1lr3CsRzgJYALTvRVILpmZAdQMtHgJb3pPyn2Kb_SkF6DVDx8uGo3DdvcVN-jxltYC0aAr9RxmAtsVpDweGCYd7BuVJEaio4vJMD_2rsOB1Z6D5137uWgZtRIL-C9RpLiB11IL6CIL-GjxDE16YX5KbtRSLhTuZxZrpC07cnbWW-EtIDVBjf8qude6UkepAcPobPgjspo8H3YJ-U9xoqQjYK6jXWUBuKOkEUrHD9FWoBa0NKEKWzfaFbbXqbYdMf0jNCNWIAXZmPmWS0lEJogJaM3W-CXoo_SG1-juOWjFYALReiIe8IN9_e3Wx7Oe-6maE7nqcRMnruBW0MP5gL_rARg7L0zEE8n3edkbjZUK1tYIF4bn7MpcQP7znVABXOmO3aWXKyTSOJUgAtoIE3NhrBu4ee2DhewD3h_x8wcz1es7E_Dp6o-URaEC-ODI1vTukojbvPsQiy8LdhY_y4YWRDuFYQxAsTLb8NG2tj1w5QDltMGWnGKfv44WZ-ewPVUG2ohhhWQwcl6YXUZn4ni4nq9VDNarEZp-pwxqhSA1EALSHmDaS8ZkNDoF6TcSGZwNES15adXpJeipooRRqoxCBds5HESoma2qwhBw5VLWmvZyfjK5yBsPwoRSfxBmLZDc5ZF1uit7E0ppeA7NLLGF8B3vGoAm0XNVpWlD-HnwlTGHTNNyzbIIFBBwNh9OK-N9oH3Q96pmCwMVzAINgWWYDVJlAPXOMtiK8p14TBoOUiuCeyEoqYfhjcwiDo6jrQQrB6jSkH8fV38ZrBiuNerYWGQVsLJmTQUNxxoTStlbNhmfaaQbwY6Y1vHGGRIQzECyJaEN_AHktFJMQaEt5A0cKWMuJGIkstkYFpgh8-fP4Vvv-0S-pUcDcqHvU9m4nnZk2iyEzCu3E071xmbYWEDakZdiogQPljCFDudEGA4hCG23D3L64qnJJib92oB-W-fJSUaxsQdy6qiudBEn9bCaUlwRuAMhNZlGuASmgT5JuEBUBX4XaE97SfGPzRBH-BcH0M_4IRzIf-d35LO44ZQMXA7V7bQCaMlXOgNWA8tMhHG6ZlVMCFCaNPpBb3RD44eP-HecOM0WJk0huzEFyTrR5zcmj_P5mIRxN5RhKE6gSlKBxdc9l9W2SrLAkY5cM26PjgOuqZErPMArciHuzE11lmZVvDXq8lwc3qq9m9X2XAynsG0inoJM9gpywXrwWf5JmnO_N1oyJvY4grk3hfpdkKeprzA81R9WqdUeXpLHydcUnK7HU6rYins9yPuiSuozpLjM6n7RtyvCGqt-u6_B_dyOG0ltlbNyaPhBOS8jRsf4akz1RRvfjy5SOWhH-gSv8uDV3mmwNTvLGLS0pYc01qdkjsy72PJt6nZRj-tPcnfPwhCDQBkUWohqeCbPyxHHhtd8fnCHWwDkHAWnClD1nyY7frPmM2kFsmzrGFjV49PxKhOIonbhdZXvx9Ii_5K0Re-veMvMx3O2uTJnm924svX94xUWH2GUsTDYe7w9ixoyHzo-5JmOKK7baHSgh2Fhaskx4Luc9CHoZp-DoWxrKbHGPCjPSq5SfRg3CY0DT_b9JkWfBoKqY0JWn0I5p-Fc3AyPdDZSToL8tDkkYeD141FbckjHH8Wh72SGgppy4cfkTBmXwcXdj3EfnFUBjGESp_zsdTDu56zeZxbHbZQMbU_dZT6rzx3I0m7rZh07zW3WvSEilJ4w4Fz4DagPJQ--VSGEVR-6pA_EQYwYqcC7DF4wH2C500jqqI_GirH3Gb9Crk-03PXLN7QL6TmCtmjzb-cbDpzG_vxgdlu-OU0Pl-NVDWEHm0DkB-MZKiNs_TfUqvcP2V8GYhuBo2u8rjZ7C8NdsOqse2V9NkWY7DwqtpPmKpyPz2zkd6SzZ43KFdvjlb3hkheZizKf8tKo6E9Hy_AtmSetBkbDpPLDsgHlK_aMhJFREvQy6lmW_eHIF6JpAOgwfS37LzrKwb4tPpzL7nSmNek-OMnvbqPLHscHqO-CcYRRMWFfEfNyzkZ3_uRY0P4R_4e54dxuHbd8A_Zg3rhsR5C-s6Wm2w0VEcfwZb471Hh_Hxy2tDC_su5jx-OJSeG9HEjSzMMdyRv4jubKbYc-Z2gxn7TOqn3H3Ep8nTgNEx5sq954USNpLen0jb_rFqkuZxnZTuJdWz3nYsu1fScuteYblFbQ_RQTyvMWMVrr-uWu4_ATvbYwwtooXYbDBvpov66BwqPY4TvbGODQd7_GhJeWdH3owT_CSwWtXbbRS5HxVWtF4pO3xk0RtsGlZaYqrVrnuiDjNm1oSQe_1myF5paYPIcW5FAMoZ3lQNBih_pgoVuwPzX0R1fD7i6TF3Uyd7U3HsMHssSQZ-i1vCHjw6vz915zi5t4i9yJ9UBnmC4hb-nUPEkD7rsdSz8LuxkE6KvrKKm5PE2bnDBzvmjk0vmU8EzQDvgOFlQ-desbPn29sWENZtL6AmpU6Ma_RqXn4RlTpNyi-i-kCVPnHqcpian-Kgx9SEgH319HIex2D5U9g0ZHls-uVYmqA0TU8hv9777hUORyqGU7PwJ7J5hnLW0uPxV0w29uopve0qlB1-m1bmB6cyp7btN69JDDIPulcbhhXGJlkb0G9t26net52EkzeAZVO-8mWrFfF0RlOdJAnhamXEVkpjqVd7zr3YCkl8K2gy4WmFCHT6337OjPIn65M7SURKYW-g2XbYjk8YsB5XhLtEA79RvYZkS7W72BDF9g3moAgM7qEWUBEC6V7ZX07uurmbWcSsSSM8uS110VzGTRmX-IJcRjkqU5QVaXKxvixaVJdNWjVVGaEwyjPUxlEZp2GdJSWpwgt6iUKURCGKoizM42gWN2XVRlVd5UVVkaICSUg2mLKZWSszIbsLe3XnMoriqMgvGK4IU_a-H0K75GBc7AgHCAG0MO32oongwXht7rljFNixZoulx0czSwik1xfy0l4bqoZOgSRkVGn1jENTzexNQ6clvf5PLzpdDJJd_vxNppGR-0v07wAAAP__hk1o6g">