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Clang-19 crashed: Assertion `!isNull() && "Cannot retrieve a NULL type pointer"' failed. #95892

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iamanonymouscs opened this issue Jun 18, 2024 · 2 comments
Open

Clang-19 crashed: Assertion `!isNull() && "Cannot retrieve a NULL type pointer"' failed. #95892

iamanonymouscs opened this issue Jun 18, 2024 · 2 comments
Labels
clang:frontend:fuzzer clang:frontend Language frontend issues, e.g. anything involving "Sema" crash Prefer [crash-on-valid] or [crash-on-invalid] OpenCL

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@iamanonymouscs
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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: 

********************
@github-actions github-actions bot added the clang Clang issues not falling into any other category label Jun 18, 2024
@iamanonymouscs iamanonymouscs changed the title 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. Clang-19 crashed: const clang::ExtQualsTypeCommonBase* clang::QualType::getCommonPtr() const: Assertion `!isNull() && "Cannot retrieve a NULL type pointer"' failed. Jun 18, 2024
@iamanonymouscs iamanonymouscs changed the title Clang-19 crashed: const clang::ExtQualsTypeCommonBase* clang::QualType::getCommonPtr() const: Assertion `!isNull() && "Cannot retrieve a NULL type pointer"' failed. Clang-19 crashed: Assertion `!isNull() && "Cannot retrieve a NULL type pointer"' failed. Jun 18, 2024
@EugeneZelenko EugeneZelenko added clang:frontend Language frontend issues, e.g. anything involving "Sema" OpenCL crash Prefer [crash-on-valid] or [crash-on-invalid] and removed clang Clang issues not falling into any other category labels Jun 18, 2024
@llvmbot
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llvmbot commented Jun 18, 2024

@llvm/issue-subscribers-clang-frontend

Author: Anonymous (iamanonymouscs)

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.      &lt;eof&gt; 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&amp;, 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&amp;, clang::InitializedEntity const&amp;, clang::InitializationKind const&amp;, llvm::MutableArrayRef&lt;clang::Expr*&gt;, clang::QualType*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x18f4550)
 #<!-- -->6 0x00007f714e0d634b clang::Sema::PerformCopyInitialization(clang::InitializedEntity const&amp;, clang::SourceLocation, clang::ActionResult&lt;clang::Expr*, true&gt;, bool, bool) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x18fb34b)
 #<!-- -->7 0x00007f714e22c9bf clang::Sema::PerformMoveOrCopyInitialization(clang::InitializedEntity const&amp;, clang::Sema::NamedReturnInfo const&amp;, 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&lt;clang::Stmt*, 32u&gt;&amp;, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc58f49)
#<!-- -->12 0x00007f714d4332cb clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector&lt;clang::Stmt*, 32u&gt;&amp;, 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&amp;) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc61def)
#<!-- -->15 0x00007f714d456c36 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::Parser::LateParsedAttrList*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc7bc36)
#<!-- -->16 0x00007f714d3a13a7 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&amp;, clang::DeclaratorContext, clang::ParsedAttributes&amp;, clang::Parser::ParsedTemplateInfo&amp;, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xbc63a7)
#<!-- -->17 0x00007f714d455cb4 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec&amp;, clang::AccessSpecifier) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc7acb4)
#<!-- -->18 0x00007f714d45569b clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc7a69b)
#<!-- -->19 0x00007f714d4548ed clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc798ed)
#<!-- -->20 0x00007f714d452d3c clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc77d3c)
#<!-- -->21 0x00007f714d38b11e clang::ParseAST(clang::Sema&amp;, 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&amp;) (/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&lt;char const*&gt;, 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&amp;) (/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: 

********************

@llvmbot
Copy link

llvmbot commented Jun 18, 2024

@llvm/issue-subscribers-opencl

Author: Anonymous (iamanonymouscs)

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.      &lt;eof&gt; 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&amp;, 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&amp;, clang::InitializedEntity const&amp;, clang::InitializationKind const&amp;, llvm::MutableArrayRef&lt;clang::Expr*&gt;, clang::QualType*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x18f4550)
 #<!-- -->6 0x00007f714e0d634b clang::Sema::PerformCopyInitialization(clang::InitializedEntity const&amp;, clang::SourceLocation, clang::ActionResult&lt;clang::Expr*, true&gt;, bool, bool) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0x18fb34b)
 #<!-- -->7 0x00007f714e22c9bf clang::Sema::PerformMoveOrCopyInitialization(clang::InitializedEntity const&amp;, clang::Sema::NamedReturnInfo const&amp;, 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&lt;clang::Stmt*, 32u&gt;&amp;, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc58f49)
#<!-- -->12 0x00007f714d4332cb clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector&lt;clang::Stmt*, 32u&gt;&amp;, 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&amp;) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc61def)
#<!-- -->15 0x00007f714d456c36 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::Parser::LateParsedAttrList*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc7bc36)
#<!-- -->16 0x00007f714d3a13a7 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&amp;, clang::DeclaratorContext, clang::ParsedAttributes&amp;, clang::Parser::ParsedTemplateInfo&amp;, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xbc63a7)
#<!-- -->17 0x00007f714d455cb4 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec&amp;, clang::AccessSpecifier) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc7acb4)
#<!-- -->18 0x00007f714d45569b clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc7a69b)
#<!-- -->19 0x00007f714d4548ed clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc798ed)
#<!-- -->20 0x00007f714d452d3c clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/usr/lib/llvm-19/bin/../lib/libclang-cpp.so.19.0+0xc77d3c)
#<!-- -->21 0x00007f714d38b11e clang::ParseAST(clang::Sema&amp;, 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&amp;) (/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&lt;char const*&gt;, 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&amp;) (/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: 

********************

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clang:frontend:fuzzer clang:frontend Language frontend issues, e.g. anything involving "Sema" crash Prefer [crash-on-valid] or [crash-on-invalid] OpenCL
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@EugeneZelenko @iamanonymouscs @llvmbot @zyn0217