Segmentation fault in compiler with openmp (cuda offload mode)

[KaruroChori]

report.zip

I cannot really reduce it to a more minimal case, because even just small changes will not result in a segmentation fault.

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: /archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21 -cc1 -triple nvptx64-nvidia-cuda -aux-triple x86_64-unknown-linux-gnu -S -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name main.cpp -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -mframe-pointer=all -ffp-contract=on -fno-rounding-math -no-integrated-as -fcuda-is-device -mllvm -enable-memcpyopt-without-libcalls -fno-threadsafe-statics -fcuda-allow-variadic-functions -mlink-builtin-bitcode /usr/lib/cuda/nvvm/libdevice/libdevice.10.bc -target-sdk-version=12.0 -mlink-builtin-bitcode /archive/shared/apps/cross-clang/install3/usr/local/bin/../lib/x86_64-unknown-linux-gnu/libomptarget-nvptx.bc -target-cpu sm_86 -target-feature +ptx80 -debug-info-kind=constructor -dwarf-version=2 -debugger-tuning=gdb -fno-dwarf-directory-asm -fdebug-compilation-dir=/archive/shared/projects/sdf-new-attempt/build -resource-dir /archive/shared/apps/cross-clang/install3/usr/local/lib/clang/21 -dependency-file src/app/sdl.p/main.cpp.o.d -MT src/app/sdl.p/main.cpp.o -sys-header-deps -internal-isystem /archive/shared/apps/cross-clang/install3/usr/local/lib/clang/21/include/openmp_wrappers -include __clang_openmp_device_functions.h -I src/app/sdl.p -I src/app -I ../src/app -I ../subprojects/magic_enum/include -I subprojects/magic_enum/__CMake_build -I ../subprojects/magic_enum/__CMake_build -I subprojects/magic_enum -I ../subprojects/magic_enum -I ../include -I subprojects/imgui-1.91.6 -I ../subprojects/imgui-1.91.6 -I ../subprojects/imgui-1.91.6/backends -I /usr/include/libpng16 -I /usr/local/include -D _GLIBCXX_ASSERTIONS=1 -D _FILE_OFFSET_BITS=64 -D IMGUI_API=__attribute__((visibility(\"default\"))) -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/x86_64-linux-gnu/c++/13 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/backward -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/x86_64-linux-gnu/c++/13 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/backward -internal-isystem /archive/shared/apps/cross-clang/install3/usr/local/lib/clang/21/include/llvm_libc_wrappers -internal-isystem /archive/shared/apps/cross-clang/install3/usr/local/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -internal-isystem /usr/lib/cuda/include -internal-isystem /archive/shared/apps/cross-clang/install3/usr/local/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O0 -Wall -Winvalid-pch -Wextra -Wpedantic -Wno-gnu-case-range -std=c++23 -fdeprecated-macro -ferror-limit 19 -fvisibility=protected -fopenmp -fopenmp-cuda-mode -fgnuc-version=4.2.1 -fno-implicit-modules -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -fcolor-diagnostics -fopenmp-is-target-device -fopenmp-host-ir-file-path /tmp/main-5817c4.bc -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/main-sm_86-ca6274.s -x c++ ../src/app/main.cpp
1.      <eof> parser at end of file
2.      ../src/app/main.cpp:190:5: LLVM IR generation of declaration 'main'
 #0 0x00005628c01defb8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1af3fb8)
 #1 0x00005628c01dcc5e llvm::sys::RunSignalHandlers() (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1af1c5e)
 #2 0x00005628c01df641 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
 #3 0x00007ff86f242990 (/lib/x86_64-linux-gnu/libc.so.6+0x42990)
 #4 0x00005628c0426a7a clang::CodeGen::CodeGenFunction::EmitStoreOfScalar(llvm::Value*, clang::CodeGen::Address, bool, clang::QualType, clang::CodeGen::LValueBaseInfo, clang::CodeGen::TBAAAccessInfo, bool, bool) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1d3ba7a)
 #5 0x00005628c042730e clang::CodeGen::CodeGenFunction::EmitStoreOfScalar(llvm::Value*, clang::CodeGen::LValue, bool) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1d3c30e)
 #6 0x00005628c0873e46 clang::CodeGen::CGOpenMPRuntimeGPU::adjustTargetSpecificDataForLambdas(clang::CodeGen::CodeGenFunction&, clang::OMPExecutableDirective const&) const (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x2188e46)
 #7 0x00005628c058b796 void clang::CodeGen::RegionCodeGenTy::CallbackFn<emitTargetTeamsRegion(clang::CodeGen::CodeGenFunction&, clang::CodeGen::PrePostActionTy&, clang::OMPTargetTeamsDirective const&)::$_0>(long, clang::CodeGen::CodeGenFunction&, clang::CodeGen::PrePostActionTy&) CGStmtOpenMP.cpp:0:0
 #8 0x00005628c04da1f0 clang::CodeGen::RegionCodeGenTy::operator()(clang::CodeGen::CodeGenFunction&) const (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1def1f0)
 #9 0x00005628c050e33b (anonymous namespace)::CGOpenMPRegionInfo::EmitBody(clang::CodeGen::CodeGenFunction&, clang::Stmt const*) CGOpenMPRuntime.cpp:0:0
#10 0x00005628c0550925 clang::CodeGen::CodeGenFunction::GenerateOpenMPCapturedStmtFunction(clang::CapturedStmt const&, clang::SourceLocation) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e65925)
#11 0x00005628c04df101 emitParallelOrTeamsOutlinedFunction(clang::CodeGen::CodeGenModule&, clang::OMPExecutableDirective const&, clang::CapturedStmt const*, clang::VarDecl const*, llvm::omp::Directive, llvm::StringRef, clang::CodeGen::RegionCodeGenTy const&) CGOpenMPRuntime.cpp:0:0
#12 0x00005628c04df30b clang::CodeGen::CGOpenMPRuntime::emitTeamsOutlinedFunction(clang::CodeGen::CodeGenFunction&, clang::OMPExecutableDirective const&, clang::VarDecl const*, llvm::omp::Directive, clang::CodeGen::RegionCodeGenTy const&) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1df430b)
#13 0x00005628c086f1cb clang::CodeGen::CGOpenMPRuntimeGPU::emitTeamsOutlinedFunction(clang::CodeGen::CodeGenFunction&, clang::OMPExecutableDirective const&, clang::VarDecl const*, llvm::omp::Directive, clang::CodeGen::RegionCodeGenTy const&) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x21841cb)
#14 0x00005628c0575fad emitCommonOMPTeamsDirective(clang::CodeGen::CodeGenFunction&, clang::OMPExecutableDirective const&, llvm::omp::Directive, clang::CodeGen::RegionCodeGenTy const&) CGStmtOpenMP.cpp:0:0
#15 0x00005628c058b603 emitTargetTeamsRegion(clang::CodeGen::CodeGenFunction&, clang::CodeGen::PrePostActionTy&, clang::OMPTargetTeamsDirective const&) CGStmtOpenMP.cpp:0:0
#16 0x00005628c04da1f0 clang::CodeGen::RegionCodeGenTy::operator()(clang::CodeGen::CodeGenFunction&) const (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1def1f0)
#17 0x00005628c050e33b (anonymous namespace)::CGOpenMPRegionInfo::EmitBody(clang::CodeGen::CodeGenFunction&, clang::Stmt const*) CGOpenMPRuntime.cpp:0:0
#18 0x00005628c0550925 clang::CodeGen::CodeGenFunction::GenerateOpenMPCapturedStmtFunction(clang::CapturedStmt const&, clang::SourceLocation) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e65925)
#19 0x00005628c05161b9 std::_Function_handler<llvm::Expected<llvm::Function*> (llvm::StringRef), clang::CodeGen::CGOpenMPRuntime::emitTargetOutlinedFunctionHelper(clang::OMPExecutableDirective const&, llvm::StringRef, llvm::Function*&, llvm::Constant*&, bool, clang::CodeGen::RegionCodeGenTy const&)::$_0>::_M_invoke(std::_Any_data const&, llvm::StringRef&&) CGOpenMPRuntime.cpp:0:0
#20 0x00005628c2db1ba7 llvm::OpenMPIRBuilder::emitTargetRegionFunction(llvm::TargetRegionEntryInfo&, std::function<llvm::Expected<llvm::Function*> (llvm::StringRef)>&, bool, llvm::Function*&, llvm::Constant*&) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x46c6ba7)
#21 0x00005628c04fe7e6 clang::CodeGen::CGOpenMPRuntime::emitTargetOutlinedFunctionHelper(clang::OMPExecutableDirective const&, llvm::StringRef, llvm::Function*&, llvm::Constant*&, bool, clang::CodeGen::RegionCodeGenTy const&) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e137e6)
#22 0x00005628c086cc93 clang::CodeGen::CGOpenMPRuntimeGPU::emitTargetOutlinedFunction(clang::OMPExecutableDirective const&, llvm::StringRef, llvm::Function*&, llvm::Constant*&, bool, clang::CodeGen::RegionCodeGenTy const&) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x2181c93)
#23 0x00005628c0576248 clang::CodeGen::CodeGenFunction::EmitOMPTargetTeamsDeviceFunction(clang::CodeGen::CodeGenModule&, llvm::StringRef, clang::OMPTargetTeamsDirective const&) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e8b248)
#24 0x00005628c050170e clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e1670e)
#25 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#26 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#27 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#28 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#29 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#30 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#31 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#32 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#33 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#34 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#35 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#36 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#37 0x00005628c0501846 clang::CodeGen::CGOpenMPRuntime::emitTargetFunctions(clang::GlobalDecl) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16846)
#38 0x00005628c05c0543 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1ed5543)
#39 0x00005628c05bb940 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1ed0940)
#40 0x00005628c0881b9c (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#41 0x00005628c087a328 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x218f328)
#42 0x00005628c1bc228a clang::ParseAST(clang::Sema&, bool, bool) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x34d728a)
#43 0x00005628c0ab88ed clang::FrontendAction::Execute() (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x23cd8ed)
#44 0x00005628c0a334d4 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x23484d4)
#45 0x00005628c0b7926a clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x248e26a)
#46 0x00005628bf2928b4 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0xba78b4)
#47 0x00005628bf28f501 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#48 0x00005628bf28e850 clang_main(int, char**, llvm::ToolContext const&) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0xba3850)
#49 0x00005628bf29bda7 main (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0xbb0da7)
#50 0x00007ff86f228150 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#51 0x00007ff86f228209 call_init ./csu/../csu/libc-start.c:128:20
#52 0x00007ff86f228209 __libc_start_main ./csu/../csu/libc-start.c:347:5
#53 0x00005628bf28d295 _start (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0xba2295)

[report.zip](https://github.com/user-attachments/files/19194717/report.zip)

clang++: error: unable to execute command: Segmentation fault
clang++: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 21.0.0git (https://github.com/llvm/llvm-project 1b455df780ed1d578b63f969c636fe78b2eb6014)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /archive/shared/apps/cross-clang/install3/usr/local/bin
clang++: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++: note: diagnostic msg: /tmp/main-sm_86-61c640.cpp
clang++: note: diagnostic msg: /tmp/main-0c022b.cpp
clang++: note: diagnostic msg: /tmp/main-sm_86-61c640.sh
clang++: note: diagnostic msg: 

[llvmbot]

@llvm/issue-subscribers-clang-codegen

Author: None (KaruroChori)

[report.zip](https://github.com/user-attachments/files/19194744/report.zip)

I cannot really reduce it to a more minimal case, because even just small changes will not result in a segmentation fault.

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: /archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21 -cc1 -triple nvptx64-nvidia-cuda -aux-triple x86_64-unknown-linux-gnu -S -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name main.cpp -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -mframe-pointer=all -ffp-contract=on -fno-rounding-math -no-integrated-as -fcuda-is-device -mllvm -enable-memcpyopt-without-libcalls -fno-threadsafe-statics -fcuda-allow-variadic-functions -mlink-builtin-bitcode /usr/lib/cuda/nvvm/libdevice/libdevice.10.bc -target-sdk-version=12.0 -mlink-builtin-bitcode /archive/shared/apps/cross-clang/install3/usr/local/bin/../lib/x86_64-unknown-linux-gnu/libomptarget-nvptx.bc -target-cpu sm_86 -target-feature +ptx80 -debug-info-kind=constructor -dwarf-version=2 -debugger-tuning=gdb -fno-dwarf-directory-asm -fdebug-compilation-dir=/archive/shared/projects/sdf-new-attempt/build -resource-dir /archive/shared/apps/cross-clang/install3/usr/local/lib/clang/21 -dependency-file src/app/sdl.p/main.cpp.o.d -MT src/app/sdl.p/main.cpp.o -sys-header-deps -internal-isystem /archive/shared/apps/cross-clang/install3/usr/local/lib/clang/21/include/openmp_wrappers -include __clang_openmp_device_functions.h -I src/app/sdl.p -I src/app -I ../src/app -I ../subprojects/magic_enum/include -I subprojects/magic_enum/__CMake_build -I ../subprojects/magic_enum/__CMake_build -I subprojects/magic_enum -I ../subprojects/magic_enum -I ../include -I subprojects/imgui-1.91.6 -I ../subprojects/imgui-1.91.6 -I ../subprojects/imgui-1.91.6/backends -I /usr/include/libpng16 -I /usr/local/include -D _GLIBCXX_ASSERTIONS=1 -D _FILE_OFFSET_BITS=64 -D IMGUI_API=__attribute__((visibility(\"default\"))) -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/x86_64-linux-gnu/c++/13 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/backward -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/x86_64-linux-gnu/c++/13 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/backward -internal-isystem /archive/shared/apps/cross-clang/install3/usr/local/lib/clang/21/include/llvm_libc_wrappers -internal-isystem /archive/shared/apps/cross-clang/install3/usr/local/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -internal-isystem /usr/lib/cuda/include -internal-isystem /archive/shared/apps/cross-clang/install3/usr/local/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O0 -Wall -Winvalid-pch -Wextra -Wpedantic -Wno-gnu-case-range -std=c++23 -fdeprecated-macro -ferror-limit 19 -fvisibility=protected -fopenmp -fopenmp-cuda-mode -fgnuc-version=4.2.1 -fno-implicit-modules -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -fcolor-diagnostics -fopenmp-is-target-device -fopenmp-host-ir-file-path /tmp/main-5817c4.bc -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/main-sm_86-ca6274.s -x c++ ../src/app/main.cpp
1.      <eof> parser at end of file
2.      ../src/app/main.cpp:190:5: LLVM IR generation of declaration 'main'
 #<!-- -->0 0x00005628c01defb8 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1af3fb8)
 #<!-- -->1 0x00005628c01dcc5e llvm::sys::RunSignalHandlers() (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1af1c5e)
 #<!-- -->2 0x00005628c01df641 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
 #<!-- -->3 0x00007ff86f242990 (/lib/x86_64-linux-gnu/libc.so.6+0x42990)
 #<!-- -->4 0x00005628c0426a7a clang::CodeGen::CodeGenFunction::EmitStoreOfScalar(llvm::Value*, clang::CodeGen::Address, bool, clang::QualType, clang::CodeGen::LValueBaseInfo, clang::CodeGen::TBAAAccessInfo, bool, bool) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1d3ba7a)
 #<!-- -->5 0x00005628c042730e clang::CodeGen::CodeGenFunction::EmitStoreOfScalar(llvm::Value*, clang::CodeGen::LValue, bool) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1d3c30e)
 #<!-- -->6 0x00005628c0873e46 clang::CodeGen::CGOpenMPRuntimeGPU::adjustTargetSpecificDataForLambdas(clang::CodeGen::CodeGenFunction&amp;, clang::OMPExecutableDirective const&amp;) const (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x2188e46)
 #<!-- -->7 0x00005628c058b796 void clang::CodeGen::RegionCodeGenTy::CallbackFn&lt;emitTargetTeamsRegion(clang::CodeGen::CodeGenFunction&amp;, clang::CodeGen::PrePostActionTy&amp;, clang::OMPTargetTeamsDirective const&amp;)::$_0&gt;(long, clang::CodeGen::CodeGenFunction&amp;, clang::CodeGen::PrePostActionTy&amp;) CGStmtOpenMP.cpp:0:0
 #<!-- -->8 0x00005628c04da1f0 clang::CodeGen::RegionCodeGenTy::operator()(clang::CodeGen::CodeGenFunction&amp;) const (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1def1f0)
 #<!-- -->9 0x00005628c050e33b (anonymous namespace)::CGOpenMPRegionInfo::EmitBody(clang::CodeGen::CodeGenFunction&amp;, clang::Stmt const*) CGOpenMPRuntime.cpp:0:0
#<!-- -->10 0x00005628c0550925 clang::CodeGen::CodeGenFunction::GenerateOpenMPCapturedStmtFunction(clang::CapturedStmt const&amp;, clang::SourceLocation) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e65925)
#<!-- -->11 0x00005628c04df101 emitParallelOrTeamsOutlinedFunction(clang::CodeGen::CodeGenModule&amp;, clang::OMPExecutableDirective const&amp;, clang::CapturedStmt const*, clang::VarDecl const*, llvm::omp::Directive, llvm::StringRef, clang::CodeGen::RegionCodeGenTy const&amp;) CGOpenMPRuntime.cpp:0:0
#<!-- -->12 0x00005628c04df30b clang::CodeGen::CGOpenMPRuntime::emitTeamsOutlinedFunction(clang::CodeGen::CodeGenFunction&amp;, clang::OMPExecutableDirective const&amp;, clang::VarDecl const*, llvm::omp::Directive, clang::CodeGen::RegionCodeGenTy const&amp;) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1df430b)
#<!-- -->13 0x00005628c086f1cb clang::CodeGen::CGOpenMPRuntimeGPU::emitTeamsOutlinedFunction(clang::CodeGen::CodeGenFunction&amp;, clang::OMPExecutableDirective const&amp;, clang::VarDecl const*, llvm::omp::Directive, clang::CodeGen::RegionCodeGenTy const&amp;) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x21841cb)
#<!-- -->14 0x00005628c0575fad emitCommonOMPTeamsDirective(clang::CodeGen::CodeGenFunction&amp;, clang::OMPExecutableDirective const&amp;, llvm::omp::Directive, clang::CodeGen::RegionCodeGenTy const&amp;) CGStmtOpenMP.cpp:0:0
#<!-- -->15 0x00005628c058b603 emitTargetTeamsRegion(clang::CodeGen::CodeGenFunction&amp;, clang::CodeGen::PrePostActionTy&amp;, clang::OMPTargetTeamsDirective const&amp;) CGStmtOpenMP.cpp:0:0
#<!-- -->16 0x00005628c04da1f0 clang::CodeGen::RegionCodeGenTy::operator()(clang::CodeGen::CodeGenFunction&amp;) const (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1def1f0)
#<!-- -->17 0x00005628c050e33b (anonymous namespace)::CGOpenMPRegionInfo::EmitBody(clang::CodeGen::CodeGenFunction&amp;, clang::Stmt const*) CGOpenMPRuntime.cpp:0:0
#<!-- -->18 0x00005628c0550925 clang::CodeGen::CodeGenFunction::GenerateOpenMPCapturedStmtFunction(clang::CapturedStmt const&amp;, clang::SourceLocation) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e65925)
#<!-- -->19 0x00005628c05161b9 std::_Function_handler&lt;llvm::Expected&lt;llvm::Function*&gt; (llvm::StringRef), clang::CodeGen::CGOpenMPRuntime::emitTargetOutlinedFunctionHelper(clang::OMPExecutableDirective const&amp;, llvm::StringRef, llvm::Function*&amp;, llvm::Constant*&amp;, bool, clang::CodeGen::RegionCodeGenTy const&amp;)::$_0&gt;::_M_invoke(std::_Any_data const&amp;, llvm::StringRef&amp;&amp;) CGOpenMPRuntime.cpp:0:0
#<!-- -->20 0x00005628c2db1ba7 llvm::OpenMPIRBuilder::emitTargetRegionFunction(llvm::TargetRegionEntryInfo&amp;, std::function&lt;llvm::Expected&lt;llvm::Function*&gt; (llvm::StringRef)&gt;&amp;, bool, llvm::Function*&amp;, llvm::Constant*&amp;) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x46c6ba7)
#<!-- -->21 0x00005628c04fe7e6 clang::CodeGen::CGOpenMPRuntime::emitTargetOutlinedFunctionHelper(clang::OMPExecutableDirective const&amp;, llvm::StringRef, llvm::Function*&amp;, llvm::Constant*&amp;, bool, clang::CodeGen::RegionCodeGenTy const&amp;) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e137e6)
#<!-- -->22 0x00005628c086cc93 clang::CodeGen::CGOpenMPRuntimeGPU::emitTargetOutlinedFunction(clang::OMPExecutableDirective const&amp;, llvm::StringRef, llvm::Function*&amp;, llvm::Constant*&amp;, bool, clang::CodeGen::RegionCodeGenTy const&amp;) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x2181c93)
#<!-- -->23 0x00005628c0576248 clang::CodeGen::CodeGenFunction::EmitOMPTargetTeamsDeviceFunction(clang::CodeGen::CodeGenModule&amp;, llvm::StringRef, clang::OMPTargetTeamsDirective const&amp;) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e8b248)
#<!-- -->24 0x00005628c050170e clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e1670e)
#<!-- -->25 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#<!-- -->26 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#<!-- -->27 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#<!-- -->28 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#<!-- -->29 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#<!-- -->30 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#<!-- -->31 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#<!-- -->32 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#<!-- -->33 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#<!-- -->34 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#<!-- -->35 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#<!-- -->36 0x00005628c0501551 clang::CodeGen::CGOpenMPRuntime::scanForTargetRegionsFunctions(clang::Stmt const*, llvm::StringRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16551)
#<!-- -->37 0x00005628c0501846 clang::CodeGen::CGOpenMPRuntime::emitTargetFunctions(clang::GlobalDecl) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1e16846)
#<!-- -->38 0x00005628c05c0543 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1ed5543)
#<!-- -->39 0x00005628c05bb940 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x1ed0940)
#<!-- -->40 0x00005628c0881b9c (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#<!-- -->41 0x00005628c087a328 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x218f328)
#<!-- -->42 0x00005628c1bc228a clang::ParseAST(clang::Sema&amp;, bool, bool) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x34d728a)
#<!-- -->43 0x00005628c0ab88ed clang::FrontendAction::Execute() (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x23cd8ed)
#<!-- -->44 0x00005628c0a334d4 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x23484d4)
#<!-- -->45 0x00005628c0b7926a clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0x248e26a)
#<!-- -->46 0x00005628bf2928b4 cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0xba78b4)
#<!-- -->47 0x00005628bf28f501 ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) driver.cpp:0:0
#<!-- -->48 0x00005628bf28e850 clang_main(int, char**, llvm::ToolContext const&amp;) (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0xba3850)
#<!-- -->49 0x00005628bf29bda7 main (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0xbb0da7)
#<!-- -->50 0x00007ff86f228150 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#<!-- -->51 0x00007ff86f228209 call_init ./csu/../csu/libc-start.c:128:20
#<!-- -->52 0x00007ff86f228209 __libc_start_main ./csu/../csu/libc-start.c:347:5
#<!-- -->53 0x00005628bf28d295 _start (/archive/shared/apps/cross-clang/install3/usr/local/bin/clang-21+0xba2295)

[report.zip](https://github.com/user-attachments/files/19194717/report.zip)

clang++: error: unable to execute command: Segmentation fault
clang++: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 21.0.0git (https://github.com/llvm/llvm-project 1b455df780ed1d578b63f969c636fe78b2eb6014)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /archive/shared/apps/cross-clang/install3/usr/local/bin
clang++: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++: note: diagnostic msg: /tmp/main-sm_86-61c640.cpp
clang++: note: diagnostic msg: /tmp/main-0c022b.cpp
clang++: note: diagnostic msg: /tmp/main-sm_86-61c640.sh
clang++: note: diagnostic msg: 

[KaruroChori]

I was able to isolate a minimal change in source which avoids the segmentation fault when using -fopenmp-cuda-mode (else it compiled without problems)

Search for const auto texture2D and change the captures from [&] to [render_buffer]. After this patch is applied clang is able to finish.

[jhuber6]

Do you have the original source? If you could get it to a state where it reproduced on the compiler explorer it would be very helpful.

[KaruroChori]

I am afraid I am unable to track which commit it was if any. I had just started this project at that point, so changes were probably not tracked yet :(.
Also, if I recall correctly, the conditions which led to this bug to manifest were quite specific; my attempts to replicate it on a smaller "test code" failed repeatedly, so I just gave up and reported it as is.

[jhuber6]

Well if you can't reproduce it I probably won't have much luck either.

[KaruroChori]

I see, while I followed the process on terminal to report it, the information attached is not sufficient. Sadly I had no idea, I never reported clang/llvm bugs before.

Let me check if I am able to do something about that.

[jhuber6]

Normally I'd feed the source through cvise to make it smaller, but offloading is kind of annoying because OpenMP requires the host-side bitcode file which is not present. It's easier to just have the original source. (Also all the paths are relative to your tree)

[KaruroChori]

I was able to inject code from the report to the closest commit and replicate the same segmentation fault as reported in here.
As it was never intended for distribution, building it can be a bit annoying since it is tailored for my workstation.
You will have to change the file ./platforms/clang-20.ini to match your toolchain and run this to configure the environment before building the target sdf.

meson setup --reconfigure build/ --buildtype=release --native-file platforms/clang-20.ini
meson compile -C build sdl

enance-amamento-a1d7a467e4ab881a76a6c54761c681533d3642d3-injected.zip

[KaruroChori]

I reduced main to this

// #define GLM_FORCE_PURE
#define GLM_FORCE_INLINE
#define GLM_FORCE_SWIZZLE
#include <glm/glm.hpp>

using namespace glm;

#include <iostream>

struct scene
{
    struct output_t
    {
        vec3 albedo;
        vec3 normals;
        vec3 light;
        float depth;
    };
};

int main(int, char *[])
{
    constexpr int WSIZE = 800;

    +[](void *buffer)
    {
        uint8_t *d = (uint8_t *)buffer;
        scene::output_t *render_buffer = nullptr;
        vec4 *sovel = nullptr;

#pragma omp target data map(from : d[0 : WSIZE * WSIZE * 4]) map(alloc : render_buffer[0 : WSIZE * WSIZE]) map(alloc : sovel[0 : WSIZE * WSIZE])
        {
            const auto texture2D = [&](ivec2 pos)
            {
                pos = clamp(pos, {0, 0}, {WSIZE, WSIZE});
                return vec4(render_buffer[pos.y * WSIZE + pos.x].normals, render_buffer[pos.y * WSIZE + pos.x].depth);
            };

#pragma omp target teams
            {
#pragma omp parallel
                {
                    texture2D({0, 0});
                }
            }
        }

        return 0;
    };

    return 0;
}

So it might be I am able to isolate pruning out virtually all my code.