<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/114022>114022</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang] clang trunk crashed at CheckMultiVersionFunction(clang::Sema&, clang::FunctionDecl*, bool&, clang::NamedDecl*&, clang::LookupResult&)
        </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/KMvrT97qM](https://godbolt.org/z/KMvrT97qM)

This invalid code will crash on Clang Trunk.
```cpp
struct S {
  int foo(int);
  int __attribute__((target("default"))) foo(int);
};
int __attribute__((target("default"))) S::foo(int) { return 2; }
```

It seems that this goes back to clang-14.

Stack dump:
```
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.      <source>:5:52: current parser token '{'
 #0 0x0000000003bd3788 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bd3788)
 #1 0x0000000003bd148c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bd148c)
 #2 0x0000000003b1ee18 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x000077ee05442520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x0000000006a64d1e CheckMultiVersionFunction(clang::Sema&, clang::FunctionDecl*, bool&, clang::NamedDecl*&, clang::LookupResult&) SemaDecl.cpp:0:0
 #5 0x0000000006a663f6 clang::Sema::CheckFunctionDeclaration(clang::Scope*, clang::FunctionDecl*, clang::LookupResult&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a663f6)
 #6 0x0000000006a6c966 clang::Sema::ActOnFunctionDeclarator(clang::Scope*, clang::Declarator&, clang::DeclContext*, clang::TypeSourceInfo*, clang::LookupResult&, llvm::MutableArrayRef<clang::TemplateParameterList*>, bool&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a6c966)
 #7 0x0000000006a71bd0 clang::Sema::HandleDeclarator(clang::Scope*, clang::Declarator&, llvm::MutableArrayRef<clang::TemplateParameterList*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a71bd0)
 #8 0x0000000006a72580 clang::Sema::ActOnStartOfFunctionDef(clang::Scope*, clang::Declarator&, llvm::MutableArrayRef<clang::TemplateParameterList*>, clang::SkipBodyInfo*, clang::Sema::FnBodyKind) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a72580)
 #9 0x00000000066aa7e0 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66aa7e0)
#10 0x00000000066df79d clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66df79d)
#11 0x000000000669edde clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x669edde)
#12 0x000000000669f59e clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x669f59e)
#13 0x00000000066a6d33 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a6d33)
#14 0x00000000066a7c1d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a7c1d)
#15 0x000000000669a13a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x669a13a)
#16 0x000000000454b258 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x454b258)
#17 0x00000000048053c9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48053c9)
#18 0x000000000478458e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x478458e)
#19 0x00000000048eadee clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48eadee)
#20 0x0000000000ce38ff cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce38ff)
#21 0x0000000000cdb5ca ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#22 0x000000000458e709 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
#23 0x0000000003b1f2c4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b1f2c4)
#24 0x000000000458ecff 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
#25 0x0000000004554d2d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4554d2d)
#26 0x0000000004555e1d 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+++0x4555e1d)
#27 0x000000000455d205 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x455d205)
#28 0x0000000000ce07a9 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce07a9)
#29 0x0000000000bae254 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xbae254)
#30 0x000077ee05429d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#31 0x000077ee05429e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#32 0x0000000000cdb07e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcdb07e)
clang++: error: clang frontend command failed with exit code 139 (use -v to see invocation)
Compiler returned: 139
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzkml1z4rjSxz-Nc6OCsmUbm4tcEBL2yW7mmdSQ2ltKltqgjZG8kpwh8-lPSTbEcoCZ2RPmnKqzlWwY6-3fv26120ZEa74WANdBehOkt1ekMRuprl_5X0QkeZJeFZK9Xgd4FuDZ04ZrZEAbSjQgrtEaBChigKHiFRFUNt--gRq3nYPwNgi7_8_ltuYVKHS3qyupQAXxDAXpzcaYWgfxLMCLAC_WkhWyMmOp1gFefAvw4o9PL-ppmv39KUhvA5z_eHc87S_vdHPxQirOEJUM0FdeVYgqojdICjSviFijJ9WI53E3bhK2P7Su2yvaqIYatERBdtNeQYgLg0opA5xzYeyasde0WhFjFC8aA6tVgPMA54aoNRj3GTMoSVOZAGM71P0cny3Ibg-f_-G8S0stnvWnt4YgBaZRAuEgvkF2Gd_4PsN7gzTAViOzIQYZS3QtQaOC0GdkJKKW4ShKxv1BS2NbWbOt7frHJn98uJst75Buii03iKCiWSMFtVTGTjpwODebphhTuQ3woqpe9n9GtZJ_ATUBXnCtG9ABXiAiGOKCVg0DZDbQOduqNYpQCPAc1QpqJSloDQxp2aj2sh1JtJaUu8hWjUCaKl6b8UmjwnEQTh-VXCuyRUStmy0Io12Q44WsrTLabYER7LcAXrTMiNagDJdCj4wNwQAvCi72zQG-CfANGq3ZV6LKUYJGazSSdl5S13b2xtSNGWs02loWaDTa5ZMR0duRfhWG7IL4lgsDFRqVQo5eQBVSg21HoyUajdaUjoyUFd0QLoL49qxe21kLUuuNNGhUUllJNWKcrIXUhlPdruFIe5eDeN7hje9aYJEF5l2OZ6n9xRYabZQCYVBNlAaFjHwGgQKc2a2Hs26LBTgOUbgL9__FBYuzPEcuMFy061fdfnhUXBjntqfW9_lbJ0W-rqQ2Csg2wBPr__32sJvpQ5wX4Jtw18k7ZCarPxroj5KcHtM_r4CIpv4slnwtSBXgvBEuazNUSbvKJdRaMZ5a7KuNAKIcza2zvwCVL6BeW3n_RwSr7KL7ROP1mUthYGfGNrHGs9D9HpaIuyWyDCBMkwSnOOxMq3gR4MUun6wmyajiotmN1qJpG-hYy_HECXdDPNlJX_aETBIWAZpvgD5_airD_wSluRSLRlALJsB5y8KBX8KWdFHRu7rvewu0cve6OSqkrN53_H-yBXboNWx9kPK5qb-Adsl64tI0bIntf5xOOrBkEpcTNFTbBow1ry-TKHLEOipr6Aw4b9451Xvj938_PBY7Sz2nTgYo6HRyAsWMms9iiEKqHyLR7z70nm3rYvn9wKfXGpYutd2LUv4QxLdt_6kxpKhgphR5_QJlEM_7M8O2roiBR6LIFgyoB66dgPjOi8NLeMFC9ryQ-V7IooKFx73Q5oR_F_9HMLoAGGe3ByYfgMFpfgKMC8-lIcp8Lt-itPzP8fFWWD7z-kay1-NR_GbFQthef3DBLgPY8vMATz3AE0Iy8AA_usqh97nHlgv-PhfaTlysz-34d3OyPUiLB1EptDk_6qGFroHNjDlQvwCxFsjbUxCOo9Anxspsys5aZ1H8pmRTnwS1rIEeT4wtwkN6fA_EAXBPMPpnQb_v32baB0m7e9wwTvvzLaT6QsQa7gW_GHzH1oMf-fCnwBh8F_5n1Qvae2FAtbXfz7P8bo-zDp1R-4hk23jJLZELIHNEPGR4gKxMp99H1pU5HrmT2_3DwQ3j7peAs1w8cPEgNU5YHJ8Fd7drQ-tknXgpWJfIe9ZaD0cywJHR6Hzee5L1A7xA1Za_fQ6fa_J3A49G-bfTQ6J0N9q7I_npcJ_8JFlTwf22lso-jxq4UK3WmulxSAf7iUQxecdhtnw6-QB06Sq_leRp9qr8JE0KnOZ9zXPJ4DcQs_bJzV262wFtDMz2D3MXUNoJ8ZR6lXCSh2lMp94zlbL3QsGOSL2QyFaDJ9KrSpMsT9IcfJztsvdCGyIoHCd62qqLxHKn0zNk6tMGwsAzpJP8Zs_LoTbIz9l7kaTU6esbgL1iLKQQ52WJKI1WW2Ln6L2e6lfwG6L2VeahVveu4Tl6kZxdxo5WpWdG5JvBipQStIc_j55cpugZs9ySqvoTqJHqfltXR20aPMjYObo6sldhTxFT_AXU-_ckVhb200YOWTh1YHrzll2BsFKOrWttd2L7MjKIZ5RUVUHo86oUfsJv1-5iaB7N5XZLBBtu6qM-1KbrJ2u7OrEMenyM4mLd3UZaBx8GrFZ0t4ui9h8F0ZyutOveUfQ62wsrowg3et88mI5Uld0TUvXabZfe2ywXRC1zNyTAWUW2BSMBzt5Q4Xz_CvJ3WRz3Rzx4cVhimvRccez1YNvypRFLUkL16uE877pLvAt1ir3IT4YhRu0G_h8OEQt9XBNlxuHZWEh9cGnCMDsJzvmOvLtj7ml6yXww0HY49Uh-puvMK3Z6tn1sAeHM9gJqUOqkKUQ_zeV3WejTUH6XxQPXxoNyLjUf4qAm3IaAe5n_4xy7YPklNC0sj2Y2oMlwmJ5Sftv77BUORyqGU174hTQvUM46PB6_fFCfhBnpytl9hbLX79LKrEsK379tf3hNYpV50r3aMCwI4DRBVvRHr91O3V_78H1k9_UVnrLpT3595YZ4c0bDOSEJ0Wplh620Icqsesb98CqQ-KvgYSUXZoDa-T_cZ27yw-r95niGQCnpToe466jsnjAQ7XZESXgFDH3lZoNgx017nCOKXWg1GtDoBRmJNADivbJ_OjiH0p57ALsn7eDB0YQrdh2zaTwlV3AdZXEYTdNJHF1trieEZiSHkmVJnsVRHpd5mtAsJoBZmdLwil_jECdRiKfhNI3TaAy0zAsyxWwSpiRjUZCEsCW8Gtu9MpZqfeWOLFxHURJifFWRAirtzuJgvE8OewjuRMfcNrhv2KUYdWda3hqGI2y19O2bdRMO0tsrde3OSxTNWgdJWHFt9JsQw03ljgG1s6S3nQ-cO9vzE8AQMf-lX55eNaq6_ucHRjoHvFzjfwUAAP__6NZhbw">