<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/69200>69200</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Assertion `!isNull() && "Cannot retrieve a NULL type pointer"' failed.
        </td>
    </tr>

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

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

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

<pre>
    Compiler explorer: https://godbolt.org/z/5Wcz3KP8h.

The following program `small.c` triggers a crash in clang-18:

> The `small.c` is quite similar to #69198 but with a different crash

``` sh
% cat small.c
int c[-1];

void foo (){
  #pragma omp task depend(inout: c[:])
}



% clang -O0 -fopenmp-simd small.c
<source>:1:7: error: 'c' declared as an array with a negative size
    1 | int c[-1];
      |       ^~
clang: /root/llvm-project/clang/include/clang/AST/Type.h:752: const clang::ExtQualsTypeCommonBase* clang::QualType::getCommonPtr() const: Assertion `!isNull() && "Cannot retrieve a NULL type 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: /opt/compiler-explorer/clang-assertions-trunk/bin/clang -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -S --gcc-toolchain=/opt/compiler-explorer/gcc-9.2.0 -fcolor-diagnostics -fno-crash-diagnostics -O0 -fopenmp-simd <source>
1.  <source>:4:39: at annotation token
2.  <source>:3:12: parsing function body 'foo'
3. <source>:3:12: in compound statement ('{}')
 #0 0x000000000372f498 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x372f498)
 #1 0x000000000372d15c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x372d15c)
 #2 0x0000000003675a78 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007efc03b50420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
 #4 0x00007efc0361300b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
 #5 0x00007efc035f2859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
 #6 0x00007efc035f2729 (/lib/x86_64-linux-gnu/libc.so.6+0x22729)
 #7 0x00007efc03603fd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
 #8 0x0000000003a5419f clang::QualType::getNonReferenceType() const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3a5419f)
 #9 0x00000000066bad0d clang::Sema::ActOnOpenMPDependClause(clang::OMPDependClause::DependDataTy const&, clang::Expr*, llvm::ArrayRef<clang::Expr*>, clang::SourceLocation, clang::SourceLocation, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x66bad0d)
#10 0x00000000067080f0 clang::Sema::ActOnOpenMPVarListClause(llvm::omp::Clause, llvm::ArrayRef<clang::Expr*>, clang::OMPVarListLocTy const&, clang::Sema::OpenMPVarListDataTy&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x67080f0)
#11 0x0000000005f5620f clang::Parser::ParseOpenMPVarListClause(llvm::omp::Directive, llvm::omp::Clause, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f5620f)
#12 0x0000000005f564a8 clang::Parser::ParseOpenMPClause(llvm::omp::Directive, llvm::omp::Clause, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f564a8)
#13 0x0000000005f625b8 clang::Parser::ParseOpenMPDeclarativeOrExecutableDirective(clang::Parser::ParsedStmtContext, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f625b8)
#14 0x0000000005f7f0e4 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f7f0e4)
#15 0x0000000005f80f88 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f80f88)
#16 0x0000000005f81ec9 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f81ec9)
#17 0x0000000005f837ea clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f837ea)
#18 0x0000000005eb1501 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5eb1501)
#19 0x0000000005ed8a18 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5ed8a18)
#20 0x0000000005ea596b clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5ea596b)
#21 0x0000000005ea609f clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (.part.0) Parser.cpp:0:0
#22 0x0000000005eada44 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5eada44)
#23 0x0000000005eae26d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5eae26d)
#24 0x0000000005ea131a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5ea131a)
#25 0x000000000499b538 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x499b538)
#26 0x00000000041fefa9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41fefa9)
#27 0x000000000418044e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x418044e)
#28 0x00000000042de12e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x42de12e)
#29 0x0000000000befa56 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbefa56)
#30 0x0000000000be731a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#31 0x0000000003fdc649 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 0x0000000003675f24 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3675f24)
#33 0x0000000003fdcc3f 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 0x0000000003fa4e05 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fa4e05)
#35 0x0000000003fa586d 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+0x3fa586d)
#36 0x0000000003fad795 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fad795)
#37 0x0000000000becefc clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbecefc)
#38 0x0000000000ae7091 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xae7091)
#39 0x00007efc035f4083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#40 0x0000000000be6dfe _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbe6dfe)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
```

Clang version:

```
clang version 18.0.0 (https://github.com/llvm/llvm-project.git ab737a86993bc7bf92cbb9d51f47f8825a717333)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/compiler-explorer/clang-assertions-trunk/bin
Compiler returned: 0
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzkWl9z4yi2_zTKC2WXhP4_5MFtx3N7bmaS28mdfXQhdOSwkUADKO3Mw372LZDsCMV2Z7bdU1O1qSQlCzj8zu_84WAgSrEtB7j24k9evLoinX4S8poKzrd1za4KUb5eL0XTshokgl1bCwnSCxfoSetWeeHCw2sPr7eiLESt50JuPbz-w8Pr-B_0j_B_77OnueevPH_R_398AlSJuhZfGd-iVoqtJA3yEl81pK7n1Et8pCXbbkEqRBCVRD0hxhGtCd_OgsxMOBLnhTfIiHQFMIV-75gGpFjDaiKRFsjDYZIHeYaKTqOvTD8hgkpWVSCB634eR3Di97_o8B7HiBKN9vPYl8yM9eJPs8CLV174aSziRbASVcJMnXk499KhFRksrSTbhiDRtEgT9YxKaIGXHs4YF502_BqxRtt4ZQb3ctOVg3H836AzHKHZnY9mlWiBN-1MsaZ0EXvhUolOUvDCGy9cBF64SM10IKWwdvVwSj2cohJoTSSUiChEOCJSktc9cRy2RLMXQ_AfsNcKoQB56RId5wTZH9M-PMU3_-pbLOx-5rUUQnt4XdcvzayV4p9Azce-B14zTuuuhNGbxcOjh9ePry3Mn4wmMbbUCa402sv1wsXNTv9fR2plOi5F0wj-iSjw8GLcyfQwHfpPW9B9z3stewP2Yo38hVIgNRPc-J2HA6Z-7ep66OXhxMMJ8jBeEs6FRhK0ZPACiKBf___2FunXFlArGNcgPYwN1xVhNZRDoNzf3iwebpDqioZpRFDRbZGEVkht_HgSdkw_dcWcimZg7T15TKkOlIfXiPASDRQi_QRDcBWEPmtJKHh4iVoJrRQUlIISDX6Cl3YkUUpQRjSUSHYcKSpZqwfID5rQZ1R2TXuIT3-O0P0Q3kRuuwa4VoOVRWutOmSV2SGrDHadkT2_aqZlx589vC4Y3zej2bb8SmQ1i9Bsi2YmvtakbY3cTrednis0awwJaDbbZcmMqGamXrkmOy9cGdZrNHtAs9mW0pkWoqZPhHEvXJ0FZjrnczw3sUVFLeSsZGTLhdKMKjSruJhZOt3X70LRiT7LUzBHaBKTkRcuwtxwRTSyPkSss2nxDLwfhd-PCk00W_dviVQmu1Ydp3agSeImrishPJz2EsL5aQEm34qmFR0vkdJEgzFen8ZSk8bSlXnYZyWTznzk7_z9T5jiKsozZP3RBpN6Vf3DvWRcW2957F0ue-skydeNUFoCaWwM2UzSR1T23U7j4U_-bgDmIA8myMsgpseQL2sgvGvv-APbcmKCveN26SxRLYz8y-I0MByc2MGZpDFJM7Q0LvcFqHgB-doD-x_Cy9pMlw3sOX2WgmvY6TltTaT69u8wRThMkUJF_bCI_Qj7aLORoLSQsJGDC6xrVnh4vcuSTRLNasa73WzLu76h1U8SSDlXYu5bXYIowr6jSeRMkwSh7xdIEqbgA_KpkZxYyZEZ6EiOHclxhbM4R6QQH0I-kozNQEdyMpWcHuz9YZkpdmWmLg9-WJXJn5MZmiGOzMzxEhJHQV6dXeN-FfwL2CKIgm0YLXUXdOgeiQM1H0NNkoKUfjmG-gAN6Z8WVN_xuxb4L_crWyYta9KZ5Tsbdb-bNNqX_ZsV0eTxdVi--8zi1Aat9PDCvH0L-4Wpdr5A5YXLI13Dm4mMB5tGbwW1ifp7Gi-YRQZO36pHHAZOnk5SP_Mr_5uk_0bkLVP6wPobTaJf8E127Nu-g8O7w0S3gp421xtCB1xvY9v9khT2DDkUOgtGXMUJ9p0QuydS2R3S_vnDJK6YBGrKapfHIyQXQtQXVXTQw1EUTxWNSPYBRf_GGkYkczQMXQ0THBcf0XBld0Z2A3Qnb3ZAO02KGkbKZeeElA-60cNC_INUtZo4qkauqmnlQ3RW1Yd93XcnD_oKvqg0yIXWkhWdNruKkZUfzDbzN6Da7CPHIW_0HTJsiDsb-dOo_iZJZ1Lm4piscgzy6GzTHhc1gOXXMUDsGiDzq-y8rx03wN-F8YuyZclw2EombAVA87Pol8N-5cDaJ1G-ejj7AcFlwTho0wnaMAVyFu162JlN0Y7GGJuf8G3HS6gwRdul_deq4OjoVJYxFEHsBx_ScQUV42zw3ckAxrd73xbyIz76CE1bEw2feSVOVQjjUbdEw1u0mwX44t7bU-FwlbtclRkJzse6IeEnKbr2JEUPLdD3qr6Rdzxwv50KP5RMB6hrIb8QvoXPnP0AGi1LYxqx79JI4jwpvknjnRw53meuQfa79e9fIN71OGuaBaWglGljFTNcXJQsy4VDVjAhK_Hz82XpaFFxODsZrBenbOprxymbt0TquanBUa_D-y8vjP54on9JovMFzs2u9w13cf0LdL6sIxg9HUcIJ0QATsqzRDyK9hZeoO5XHGdP3ZLfO7jXk-rikK3s5u5IbfG2R_tFlF0Nn5tWSG0Xu4svVb2CDgPRhIEgDN4vx_bkIJuC7lXpi4YfUZn3YBy0TmEY5XkRh85isRQl_AR8YeNzv4c2ew4YXu2PHS6EcYDgYHTKsSiooCJOObaWZvnh5RGQF4fXz-7AS114mR9F4FLYT_iZK004heMsntbnwj47IHRUcMqrCJcQYHC_pbJg3zR5OSzZ2TlNL5xwBmQOdKfa8QuoSJwgSoNNQ5i7Xxl_I_RE5L6AO3wZ5LzDS_QiWHlpDXp8YwXcwwu_gNTkiz3hy-DRZoHj267PTVsf1SZxv-EwMoYSbVS25qiU7OXEijY5mahKmkS5pWQkd3_Es5GWVds6HDfbMx0vXFBS1wWhz5uKu2m8n3vwm2WwFE1DeDkN3qPWU3roJ1ozOzEcjPjRkvHtsDj0pj0M2GzobhcE_YeCKEY3ynYfWHQ6mxcbLQnTat88EUfq2sRBv_8d2k2XxVv6XoyPbs0vTmvSFCWxZ1h7qnC2P8X5WRTH7fHuBKbC0cgUx85Z-pYvHX8gFdSvDp3nTXfR46Qeq-Pz4dS5aOiUi_91zjEpNU96QeQSRyLw45PEWauRd2vink0ndU8Gmg6ndrhnui6cEubyBzm9wo4rxRNG4swtOD_CyM-iUKfp-FkUZuvu0HEuHR88oCXMGN-ehH6cwcFNfjCPhiaHx2TCY5nmJz1rNXp2SoMjNcEp_v9CHi-ZzHpiHObSyQJOoaI9yn0Nskduk8ji3XHfqeX5glWHweSAdio-n0Dq5wEycC83ay_UmTWfHGRHfhaizaZmhcm1ROrNCMJHj7aNkPEs0bSiSsoKUC__kpwasYd59175dpPNvkHVUMsjOvhnf9mqv8oGO2YsXgIKwshA6xSg2QvSAikAxEZldj65GDi-fbe0M72AVENiO3aTcARz3xUF2dyf-2biP3eva75lGpEiDVOSJXkeFjQtqhzTosjLOKiitMoyHJM0SMPwzTSPRG7B3mAbbNrxZy6-8pFth0uaEkiJGlFCbS8UCcV2fZPdWNQ1lCsmv-82V0_c_mapBN1JDibfIH9C3FV5HZZ5mJMruA6SPI2S0I-Cq6frDGdxHIVBkUW4qMIE_Djxse-TIAqDMo-v2DX2cRj4QRKEZsycAI6CNEn9mBh2wIt8aAir54bcuZDbK3td7jrJse9f1aSAWtmrsRhz-Ipso4exF6-u5LU1SNFtlRf5NVNavUnRTNdw_aPuCV51sr7-zy8CWuX-HQAA__8OYosk">