<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/95892>95892</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang-19 crashed with the attribute `opencl_global_device`: /root/llvm-project/clang/include/clang/AST/Type.h:956: const clang::ExtQualsTypeCommonBase* clang::QualType::getCommonPtr() const: Assertion `!isNull() && "Cannot retrieve a NULL type pointer"' failed.
        </td>
    </tr>

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

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

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

<pre>
    Clang-19 with the attribute `opencl_global_device` enabled.

Compiler explorer(assertion trunck): https://godbolt.org/z/WKGesoejq
```
$cat mutant.c
a(;
__attribute__((opencl_global_device )) * b() {
return a

$clang-19 mutant.c
mutant.c:1:3: error: expected parameter declarator
    1 | a(;
      |   ^
mutant.c:1:3: error: expected ')'
mutant.c:1:2: note: to match this '('
    1 | a(;
      | ^
mutant.c:1:1: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
    1 | a(;
 | ^
      | int
mutant.c:2:51: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
 2 |          __attribute__((opencl_global_device )) * b() {
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   ^
      | int
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: /usr/lib/llvm-19/bin/clang -cc1 -triple x86_64-pc-linux-gnu -emit-obj -mrelax-all -dumpdir a- -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name mutant.c -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/root/code/my_code/diff_coverage/combine_test/case_reduce -fcoverage-compilation-dir=/root/code/my_code/diff_coverage/combine_test/case_reduce -resource-dir /usr/lib/llvm-19/lib/clang/19 -internal-isystem /usr/lib/llvm-19/lib/clang/19/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/9/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/mutant-78f8d7.o -x c mutant.c
1.      <eof> parser at end of file
2.      mutant.c:2:55: parsing function body 'b'
3. mutant.c:2:55: in compound statement ('{}')
 #0 0x00007f7145e43216 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0xdc1216)
 #1 0x00007f7145e40ec0 llvm::sys::RunSignalHandlers() (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0xdbeec0)
 #2 0x00007f7145e438f0 (/usr/lib/llvm-19/bin/../lib/libLLVM.so.19.0+0xdc18f0)
 #3 0x00007f7150832980 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12980)
 #4 0x00007f714df331e4 clang::Sema::DiagnoseAssignmentResult(clang::Sema::AssignConvertType, clang::SourceLocation, clang::QualType, clang::QualType, clang::Expr*, clang::Sema::AssignmentAction, bool*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x17581e4)
 #5 0x00007f714e0cf550 clang::InitializationSequence::Perform(clang::Sema&, clang::InitializedEntity const&, clang::InitializationKind const&, llvm::MutableArrayRef<clang::Expr*>, clang::QualType*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x18f4550)
 #6 0x00007f714e0d634b clang::Sema::PerformCopyInitialization(clang::InitializedEntity const&, clang::SourceLocation, clang::ActionResult<clang::Expr*, true>, bool, bool) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x18fb34b)
 #7 0x00007f714e22c9bf clang::Sema::PerformMoveOrCopyInitialization(clang::InitializedEntity const&, clang::Sema::NamedReturnInfo const&, clang::Expr*, bool) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x1a519bf)
 #8 0x00007f714e22ecf3 clang::Sema::BuildReturnStmt(clang::SourceLocation, clang::Expr*, bool) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x1a53cf3)
 #9 0x00007f714e22e2d1 clang::Sema::ActOnReturnStmt(clang::SourceLocation, clang::Expr*, clang::Scope*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x1a532d1)
#10 0x00007f714d439e90 clang::Parser::ParseReturnStatement() (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc5ee90)
#11 0x00007f714d433f49 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc58f49)
#12 0x00007f714d4332cb clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc582cb)
#13 0x00007f714d43bc80 clang::Parser::ParseCompoundStatementBody(bool) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc60c80)
#14 0x00007f714d43cdef clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc61def)
#15 0x00007f714d456c36 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc7bc36)
#16 0x00007f714d3a13a7 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xbc63a7)
#17 0x00007f714d455cb4 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc7acb4)
#18 0x00007f714d45569b clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc7a69b)
#19 0x00007f714d4548ed clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc798ed)
#20 0x00007f714d452d3c clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc77d3c)
#21 0x00007f714d38b11e clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xbb011e)
#22 0x00007f714f288825 clang::FrontendAction::Execute() (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x2aad825)
#23 0x00007f714f2040d4 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x2a290d4)
#24 0x00007f714f301f7e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x2b26f7e)
#25 0x0000556391993fad cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/lib/llvm-19/bin/clang+0x12fad)
#26 0x0000556391991075 (/usr/lib/llvm-19/bin/clang+0x10075)
#27 0x0000556391990213 clang_main(int, char**, llvm::ToolContext const&) (/usr/lib/llvm-19/bin/clang+0xf213)
#28 0x000055639199e556 main (/usr/lib/llvm-19/bin/clang+0x1d556)
#29 0x00007f714427cc87 __libc_start_main /build/glibc-CVJwZb/glibc-2.27/csu/../csu/libc-start.c:344:0
#30 0x000055639198dbfa _start (/usr/lib/llvm-19/bin/clang+0xcbfa)
clang-19: error: unable to execute command: Segmentation fault (core dumped)
clang-19: error: clang frontend command failed due to signal (use -v to see invocation)
Ubuntu clang version 19.0.0 (++20240301064251+dd426fa5f931-1~exp1~20240301184412.1845)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-19/bin
clang-19: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-19: note: diagnostic msg: /tmp/mutant-c932d2.c
clang-19: note: diagnostic msg: /tmp/mutant-c932d2.sh
clang-19: note: diagnostic msg: 

********************
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzMWl9T67a2_zTmReOMLf9_4CEkZJd72IUDtJ25LxlZWg7qtiVXkimch372O5KdEJuQDbvpncMwYMuS1lo_rX-SFtGabwTAuZdceMnyjHTmUapzThoipHhpZKepPislezlf1ERs_LBAf3LziMwjIGKM4mVnAHlpIFsQtF5valmSes3giVPw0gCBIGUNbOYFSy-Y938Xsml5DQrBc1tLBcrDOdEalOFSIKM6Qb95uPCiOXo0ptVeNPfwysOrjWSlrM1Mqo2HV__x8Oq3f30BLeH3P4b502D47V9xTIlBTWeIMDPaNxIP51500b-s1zsp1mv7AeeHJEGWHVwgD89R6boVyMuGORSYTglE9kW0lLeAjcnv3qJ56EXzyEoJSknlHp5boAYYaokiDRhQiAGtiSJGqn48QgiFyMsWaCQIcj-2GSEvufwMLQ9nTrzs4CBs-wppwP43EjXEULv-XPcD893A73L2Hl_hiC_z0gLSLVBecVCo4VpzsfHwAjGoSFcbbdnwcMaFsbSjC3R1f4MWRYGIYKgmDjVpeUa6a1upDOJNW3PKDeLCIC-58H_btvh2lmR5XIIR86_y2KFTeSxcyX-PQHhQieHnFOr-Kv9fH_rZV8gD2N1eX87vL5HuyoYbRFDZbZACJ6SRU_vn5rErZ1Q2Hl7V9dP2n98q-TtQ4-EV17oD7eGVw44LWncMnLuiiuhHVBL6zShCweLfKmiVpKA1MKRlp_pmO5JoLSkn1j5UJ5Cmirdm8GL3htBviHVNazlzTcEM3Sq5UaRBRG26BoSxbCMPrzqtLJu83DIbFh5elVx4eOV8BPIpDZFvFG9rQM95uk5jv6V-zUX37G9Eh3xouPFl-TvyGwU1efZJXSPfcsC4QsRHPuPaOlq_UgDIpzUQ5RNt_BIqqcC3YoNgr_0cJ0-gep20zZQo5j-RugNfkAY08hvChV_xum_Y-bGeCUmJddd-IxnUqOUU-S2nfg1PUCPcv3DttxyQ31TWm_mt5MKA8qKlY79qiHn0QSkhkV9VrU-lsEtjvGgpBfIrIX0lO8G42Pi2L_IbKoU2qqNGKp_UnGjLZ9WJP7lgvrGSaS9aYuQbojZgfNp2FlE_jZFvOgGuYQMClGWYQdltNqDsJ2uS0XLDSuRXrt2nLkz1UjJu2fbwSklp1YxKBh5eNS_r4YnxqlpT-QSKbMB1aEouYG1Au_5Ew1oB6yggv9r2--dIKOjV2c76vhL2704JPbwKC-S7BRKk9rl-0Qaaj4-1tjdY27FZJCX1B7s6AhtKPbwajGJnER5eWYKz2ds_B7q-JQbP9oG-JTp0PTDP8dGfJ4H8ykUIv-bW8Vnwq43oqDVKzaXwomU8w7MQ-ZX-xltfMuXTR6DffC78TVM5Naql8hknGyG14dSaAmFMab5B_nK9_rJYrH-a_3q5Xv42v1vh9WJ1tZ7ff_WiZYh8G3FWpmmtijnD9rO8ylk2k8h_RnSStYSzwXVHC5CVF13aDEWDQsQg61dkhayj6DvjofM0LCbWI9pxXGxQ1Qnq8j2bXdroV-4SiWh2eCgXyBqMdQlIG2LAulk0pCDZhZcth1RmiNo4ClDwHARBkFVZGCcQRzhMkQsc0dyL5vpF9w-3igvj3PpDHxvy106K_LmW2iggjYdTGx9cnC56wkfdu1PI4RMvr69__TrTchYWs8DDF8EzoyEO0xHD4YThAGhwiOG7TtzzjSD1T0SwGpTeRum_zVMJQIMRT3gKYl4FJxE-r8aEoj1CSZBHuMgDtF4r0EYqWKthrYdJDxh6zcvWPCogzJLq6YR2lhGZeF8eVkVRCDHqHZnD9h4a0j8te9OCudsmWW27A93VxsP5wf59v4UUT6DMw0vrson9ns4nXw-hc_Lx3x2pD4x5p_nyuVUenk8JTFixLM_pllgpZe3GfF5P-s0MbdvRGoZZkocQj9BN9tGFgFZJEuyzeCW44aTm_3EY3MMfHQgKgxmCqqRqDsDbG96haYBdCsPNC3KpwZGOjt6_uGCjnq-29bVz-cNcKfJyB5UXLQ7AHV2-uzynxDWv4iQZa206xpWlUVweXvoBxYVsX8bCj3H9MIJHtbbXrsEsDkKGF3ZLDwN0vQ5u_58QsDKKyxFg2QgwjGlRVkcB-yqf4EadDrbd_D-TBtidOyW4EpV8b8AeYCdGhyRhUVYjdPIJOkCr6DD3Fx2vB-7vTTP1fcd0458UKKJVNBKomAqEWfiOa6TmRvxdgfaHUHlq-ydJhFm4k88mBqNUhsVRAcXIr966fGzveSvhkCf9YIJwmEGaABTBiL9wwl9UxcVR_nac3ajlcMbFpZhXBtR8e0ihR5nYfUPq-lewm7-xq-mX0a1LhDvnaabG9YY8s4MWUhh4Nt9xeNMF78fvM3mQ2rTH6cDPq7gYgY-n4GNa_gD4_y1onxApTMsRUtEEqZLmx81oMew4dohdSPbi4fy0Ho2mAc3HBhVPOKUMqqOcroYd1ZTTvTF2rd_R55F29B7tlDqbhgyqkXzJWL4kpVH6IfmWUHEbhKeR-bbfWS5fD8w_oJcP0LQ1MXAsMO-PuiYGXq37mmtzWo3NShqlI5xGiR-LSBiR7KhMFoAvSnbtu_Dct0DfivkK3GFD_aDbexfe72eWxxRzJdUdERuw-ddJIS9pGpFsBHk2Uc2ElvF3Ib9Rewp6NRwDvV2CHwgcb3ocXcY5paD1_fa-4ZS6SWgZj4DKp0ClxfG4sxdsRni9a9Anh2uqY_8kXGkxDj7FBK44B3YUrsvnXo3GMfr_AaLTgVDkwPZBwJNENsEsokdBeJDtNTxB3QevfelvWvJHB7dmkqDsHKDbxh9IT173Al8l62q4alqpjIubp416WcYiOpJ-nCZHeRmG8Eb6-f3Du2cg_8wGuiyDMIQRp6OcssJ5nuNkn9OVslFCsOF8adggAe0siCfca2BCWI6TEW_RmLcgDtjIQW8rDK6ENmR3vDRwtz0Qy98X5pRKgAkuAjbym3iU21VREFYZjDeajtNXMZ52MTI_JuYpTReXOK2ysU5sc7YkSaMiLIqoIgxRGq4bwse7h_1jtEeitqnV7gRt1IYX6Ely9mH2h1snd7pbkbF7SScshkGWfG7KIMjG2pZNpgxwOJyVbOV2NwK9VE6I-fho8UHKesip9nLMz0la4TAacZVPuIIkSZHl53PSsiQZ5Zt4FKRinFGaZ2i9tnqy1oYosx6IrMqO18zDq4395i9-_Z8__7fcveIZziwl3W31rX90H9087nYnimMvmu_qdaLdlc0gVs7KiqCe8KcEo2VFdnJta3FGdRmdK01CRiLozQ1R2TREMPvxHjZ2C-WMDrkqDUudSgXu4n8vph2cu7_Yrwavsp0YVYTXwBDrHFntbnDsvJ0G5D-5NgDE98x9IPJL2QnTDdMON4TImupsuIq58PAFDnAcREEYpDFOQg9fMBbjtCJJVUShH_4Fz23417ZTmMdxiGdhHr8q-4O7NLf8H6hCGLq46xXkbv3ddZ7U_Ln_5LxQXQNbcvXd2oc30G1LjF6vM1GjN26eQTf-xu9eZdZQbzJ_eJgvfkIPP12i1c319c1vVz9_Qaur68t79HDjmi9--YLuLm9v7h52VR63h-pFcm1N-d2akV0HBcgVTQBDxOym_CAEk6taWkSY4e3l7N-aQz_-wFqcakW25Xpn7DxiRVSQMzgPszBPiwyH6dnjOWQQlFAmFYlIDiSHpIqrMoOwCPOgxOkZP3cKnYZ5kCVRlM6yMg3jkKUsIjTGQe7FATSE1zOrfzOpNmeuROi8SPICn9WkhFq78keMB-eBvWR5ps6dvpbdRntxUHNt9OsMhpsaXisiXWURsM9VRg5LMhR7TKqYtmUVr-UI2xaXGq4eXlqYPXrRvEhS525sUBknEObfHam17biQTSPFBdE2Pzh4d-XeNmD6njaf7hO4PlZFczTfVWdaznHI9c9dXe_SvNTDKfIwXhAhpEEKjOLwBIign3-5vu4L4LbFPxh7OBsc4eysU_X5j9d49Wv4dI7_LwAA__-gcvbg">