<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/112097>112097</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang++] Assertion `Info.Ctx.hasSameUnqualifiedType(BaseIt->getType(), BaseType) && "base class initializers not in expected order"' failed.
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang:frontend,
            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/GfavW7bT1](https://godbolt.org/z/GfavW7bT1)

This invalid code will crash on Clang Assertion Trunk. It seems that this goes back to clang-6:
```cpp
struct B {
    B() : c{'x'} {}
    char c[5];
};
struct D : B { };
struct E : D , B {
    constexpr E() : B(), c{'x'} {}
};
```

Stack dump:
```
clang++: /root/llvm-project/clang/lib/AST/ExprConstant.cpp:6641: bool HandleConstructorCall(const clang::Expr*, const {anonymous}::LValue&, {anonymous}::CallRef, const clang::CXXConstructorDecl*, {anonymous}::EvalInfo&, clang::APValue&): Assertion `Info.Ctx.hasSameUnqualifiedType(BaseIt->getType(), BaseType) && "base class initializers not in expected order"' 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.      <source>:6:1: parsing struct/union/class body 'E'
3.      <source>:7:33: parsing function body 'E::E'
 #0 0x0000000003baa4b8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3baa4b8)
 #1 0x0000000003ba817c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ba817c)
 #2 0x0000000003af53d8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007f2c12a42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007f2c12a969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007f2c12a42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007f2c12a287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007f2c12a2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007f2c12a39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x0000000007b46e5e (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7b46e5e)
#10 0x0000000007b46f9f HandleConstructorCall(clang::Expr const*, (anonymous namespace)::LValue const&, llvm::ArrayRef<clang::Expr const*>, clang::CXXConstructorDecl const*, (anonymous namespace)::EvalInfo&, clang::APValue&) ExprConstant.cpp:0:0
#11 0x0000000007b62c98 clang::Expr::isPotentialConstantExpr(clang::FunctionDecl const*, llvm::SmallVectorImpl<std::pair<clang::SourceLocation, clang::PartialDiagnostic>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7b62c98)
#12 0x0000000006a9eaed clang::Sema::CheckConstexprFunctionDefinition(clang::FunctionDecl const*, clang::Sema::CheckConstexprKind) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a9eaed)
#13 0x00000000069f6e5b clang::Sema::ActOnFinishFunctionBody(clang::Decl*, clang::Stmt*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69f6e5b)
#14 0x000000000673dd4f clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x673dd4f)
#15 0x000000000665f570 clang::Parser::ParseLexedMethodDef(clang::Parser::LexedMethod&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x665f570)
#16 0x000000000665f25d clang::Parser::ParseLexedMethodDefs(clang::Parser::ParsingClass&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x665f25d)
#17 0x00000000066b09de clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&, unsigned int, clang::Decl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66b09de)
#18 0x00000000066b3003 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66b3003)
#19 0x0000000006687800 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6687800)
#20 0x0000000006644cf4 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6644cf4)
#21 0x000000000664575e clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x664575e)
#22 0x000000000664cef3 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x664cef3)
#23 0x000000000664dddd clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x664dddd)
#24 0x00000000066402fa clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66402fa)
#25 0x00000000045029b8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x45029b8)
#26 0x00000000047bc2b9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47bc2b9)
#27 0x000000000473ae5e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x473ae5e)
#28 0x00000000048a1e2e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48a1e2e)
#29 0x0000000000cdb89f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcdb89f)
#30 0x0000000000cd35aa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#31 0x0000000004546689 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
#32 0x0000000003af5884 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3af5884)
#33 0x0000000004546c7f 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
#34 0x000000000450c5bd clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x450c5bd)
#35 0x000000000450d6ad 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+++0x450d6ad)
#36 0x0000000004514fd5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4514fd5)
#37 0x0000000000cd876f clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd876f)
#38 0x0000000000ba7cc4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xba7cc4)
#39 0x00007f2c12a29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#40 0x00007f2c12a29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#41 0x0000000000cd305e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd305e)
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/eJzkWm9vo7j2_jT0jZUIDAR40Rdp_uxv9jerqba9e-ddZMwh8Q6xWdt00vn0VzbQYJJ02lWzutJddUcE28fP8_j4-GCbKMW2HODWi--8eHlDGr0T8vaZ_Ul4lEbxTS6K51sPzz08f9wxhTQoTYkCxBTaAgdJNBQof0YElc2PHyCnbWXPX3p-9-9C7GtWgUSrQ10JCdIL58iL73Za18oL5x5ee3i9FUUuKj0Vcuvh9Q8Pr38pydO_k_wx8OKlh9O3V8fZsHuLm_EnUrECUVEA-s6qClFJ1A4JjhYV4Vs0VwqkZoKjR9nwb1P0SSMFsFdI74hG2hjZClAoJ_Qb0gJR02wyM4DazmZ--0frun2jtGyoRnfIS-7aNwghdOfh1MMZMiJQU4KTg4cTL1naesnyWJXuiETUi-9io0DYGTFV-ueui6W1ZjtCZ4pXtniJPLwYo6GCKw2HWqLVAFeH0dR_BeKwpxf2Q-UftNGqaPb1qUrtTyuih-_Mn3EKvJZCaA-vq-ppP6ml-BOo-dnVW1cs9_B6_vDo4fXqUMuFgU-4nhrRw_lsFgXGTi5Ehf6P8KICW8OoIOSCVJWHU0u5HT4DK5wbQ9ZrF60chiThgj_vRaMsSVPr8x-kasDDM1PvbA1j_3coj3YGfSy-fh0gWQKtuh7PWlo9keoTL0XX28DO_P4IIzNUj37rzXzTZrrQh-mOqAeyh3_xvxpSsZJB8fhcg4fTO6Lgk5544WoLunvXjbQpat9kyNqfIQ_j3Ex2WhFl5hDTjFTsB0iFuNCIcQSHGqgJAUIWID2MPZygkrAKimk7xPefV_OHFVJNvmcaEZQ3WyShFlKbWTSa1EzvmnxKxb5zgVNPYEo1oDy8RoQXiHFaNQUgvYNuQpvpqSWhYCjVEmopKCgFBVKike1r05IoJSiz0Us2HCkqWa2nF_3Wn3p-di_FVpI9InLb7IFr1fmsqK2PdmFuAn2Y6_x2QvoxUhNtgouH1znjR7c27o8m2-I7keUkQpMtmghjl9S1sd7outFThSZ7owWaTA7pbELUfqKeuSYHL1wyrqFCk5KLyRPIXCgw5WjygCaTLaUTLURFd4RxL1y-itdUVpzUaic0mpRUVEJOCka2XCjNqGr7sEo7r71w0ckbrlrBAiOYFy5AlF64QjWRCiQiGgEvkChRySpoa-Ku5tFAODdh1c5k047xLWpnjofXDWeik04pZJYn5OFkZcKTtRaesZZ44TwMh-bKhlM7aY4G2on3Ygd5OPSRf_D7_8KckChPkXVLW1k9q_bhXjKurdM8tp6XHitJ8n0jlJZA9t1sZly3Uyz9INfx8J1_6OC9rH0GfzDCnwYJPYd_UQHhTf2FP7AtJyZGNtzmBQWqhOnlGmgNGActdtCSMg6LFC2Mq_0OVDyBfG7htXFdejjtlHTqLATXcOgXBN_-_9JF2HWRlJgGmEQ4xn5HrV1ZDulsM4smFePNYbLlTVtAp0pMZxa4beLAjlyb2SwrKar1TgIpNt9MpvGuDmx7p4N4DDpKZmirrBbvBR8lM8f2zLWN06QMEclNcH6XZdvQsZycWA7yd9sMcsdm6toMM8hm77Npmzg2s6HXJXk0gxg-2ts7s8e8FIeBP-63zMrLKYubrLTpRZ9A4PQlgUCc7EHVNgZlw7Slb2ED0DECzKUkzyZlCRcXuwhXoxTkNJV5D543pjboTHY3mMxGwcBVcIZplp6kdfaJqXuhgZvkpTfZ5nxDYdfdknBC6CjXw55U1R9gaH_a15VZZXTRFtWESVfFB7sAfRaUaLtiOVzviTRoli9LqF2oVh33D3c_q43jfk6wnZEMCBRDgA-wJ91w74B-W_SfCUeVSpsOGmZvUvENtv-f8eIK9Dt2Dv3QoZ-VM4jz8xDnVH_ha8aZ2vXc7kTx7LIe5PNDI3rfszcfJNeg1iJ3qEUOtSQsiqgcuZ4COXjuaT1oosGktW_ld2LpgYoaruPDHRGHaewwncVlnPiv4vsMByh-A70TxdJ8p6UXKg_qXYlNC9ZhMxuzwXHxDjbqMp37NuldmIz5enxw7E6xxOWT-1kBr_JZfP36G-xzkA81UFayPnCmbw2qP4u4Coq51pLljQbVrT8via7NJZ0WL05_BbmsGo5c6Uiu0PfD1-Uyw9lJBaO1TItv7cOj-Aa8jatvl8oQN4ZPl-gTEMUj7OuKaLiwpFPz7T0A2UfCi1b7vrs0_i2DeI3hMeo7w5O5w5Mmqf96rDFEiLTyvvBXp1H1ajr_fX37IEg0HPX-zM6t5CYLYpTZjSST6r1YvcKYWMmHY4J9d0yiiJbRT8fkyzCF-cQ1yPaL9-eh4t01GN9eHuKTIbuCZFYRR7JgJFmcxK8H5YEbf_lp8ncV4cY-948IZ3RxhMMj4SiUr4fn1aF1rYGA_4xY15DDsHXkCEdyFEXxerLyKOrP8ARVu6gOdfhSk78auNejzydT8Rcpmtp-nq5OuR9T9N9E0VTwaV8LqW0Se61lwdJ0dIhGOvi4JCc62OOKdAy9JdQvh9f6QGghOZidtDmKfZzlznfzQhTwC_C5ner9pzTQRkP3qjsn-likHRAHqZMSR0lOcZ4Nka6lWW94cQbqlUC2GByQiQsyJOCG1P7085PdeKBwXtHLrK7iyx1Oh4iTgUYpCQCDu59iIR_5PIlzKfoJ36sEpQ6fQ8DJ0Xxa5GlWIkqDzZ4YG-n5fS97xjra7HLe4QV6Eqy4Do8W5ZCGe-rg0yKMCUG9-Ivg0UaK9LVdqVNOo30_Y6PL1QY7gxkqJHsCeXa7zT1MiOJoNkszK8zAbn-sspFWW1vaHTCG3QkLJVWVE_ptU3I34Ld9dz60CBZivye8GE_qs2P4sgsnatM7MRoM9NGS8W23jLQD_NJgs6GHQxC0P3KiGN0oW71T0alsXmy0JEyrvnhkjlSVmRNCDspNlcEekHWiVnPbxMNJRfZ5QTycHKXCaX_w8qvIz4_HyXFJmkaDoTh3KNKW_N7wB1JC9ezI-frQXeEEqEXseH44djGaOFtX_3MuYkSf1kTqqf-qL0SjJZ3GeXFRODt25GTF7NV0gvmooangHCW8rercSXYG3D44gTC0HYcapzrFjLxbl19Fri6L8qvIzafxhfOVnx8YnG47varj8ZTg-moasRw13XQsDqKyiC8hXw6encThTMZwaRT-QTWvkM5aeRz9ktHCniazLrz1GUqP34aV-cn506Vl-8NzEoPMge7khn5OEkojZEB_dN-taafvbHSSnBXZOw_tbZOhzcgf24TIR5uNabZRmki9GZB7cy8Qub0E40zOjwG19j9-zIzxl96HxeEcgZTC3rq071HZfWEg2s2I9sIW-s70DsGB6faaZBBGBmajAE2ekBZIASA2SPuz0f1OCbqRHMycNI1HN_5uituwyMKM3MBtkOA0ifwwTm92tyGJIJjFZVHSMAmAFkkcBLOcJOYjBRf4ht1iH0eBH-AgDLMgnYZpmMZhHtGQBIEf5F7kw56wamrmylTI7Y29JnYbBNjPkpuK5FApe8cV4z449CLYO2sLU2BvNQk-6e6KHgvGLUy29ONHe90tXt7IW3tHLW-2yov8iimtjkA005W9Xjscknj533xv76aR1e3fv5jXif50i_8TAAD__5ROkdQ">