[Flang][OpenMP] crashes with 'use' inside block inside OpenMP parallel loop

[k-arrows]

Reproducer:
https://godbolt.org/z/r9xzx4xPn

module m
  integer :: n
end module
program p
  integer :: i
  !$omp parallel do
  do i=1,2
    block
      use m
      do n=1,2
      end do
    end block
  end do
end program p

Backtrace:

PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
Stack dump:
0.	Program arguments: /cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang -fc1 -triple x86_64-unknown-linux-gnu -S -mrelocation-model pic -pic-level 2 -pic-is-pie -target-cpu x86-64 -mllvm -x86-asm-syntax=intel -fopenmp -resource-dir /cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/lib/clang/22 -mframe-pointer=all -o /app/output.s -x f95 /app/example.f90
 #0 0x0000000004282c48 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x4282c48)
 #1 0x000000000427fe14 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
 #2 0x000074763cc42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #3 0x000000000a1678b3 mlir::Value::getLoc() const (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0xa1678b3)
 #4 0x0000000004b0e5e9 void Fortran::lower::privatizeSymbol<mlir::omp::PrivateClauseOp, mlir::omp::PrivateClauseOps>(Fortran::lower::AbstractConverter&, fir::FirOpBuilder&, Fortran::lower::SymMap&, llvm::SetVector<Fortran::semantics::Symbol const*, llvm::SmallVector<Fortran::semantics::Symbol const*, 0u>, llvm::DenseSet<Fortran::semantics::Symbol const*, llvm::DenseMapInfo<Fortran::semantics::Symbol const*, void>>, 0u>&, llvm::SmallPtrSet<Fortran::semantics::Symbol const*, 16u>&, Fortran::semantics::Symbol const*, mlir::omp::PrivateClauseOps*, std::optional<llvm::omp::Directive>) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x4b0e5e9)
 #5 0x0000000004baee22 Fortran::lower::omp::DataSharingProcessor::privatize(mlir::omp::PrivateClauseOps*, std::optional<llvm::omp::Directive>) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x4baee22)
 #6 0x0000000004bb158b Fortran::lower::omp::DataSharingProcessor::processStep1(mlir::omp::PrivateClauseOps*, std::optional<llvm::omp::Directive>) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x4bb158b)
 #7 0x0000000004a4f2b2 genStandaloneDo(Fortran::lower::AbstractConverter&, Fortran::lower::SymMap&, Fortran::lower::StatementContext&, Fortran::semantics::SemanticsContext&, Fortran::lower::pft::Evaluation&, mlir::Location, llvm::SmallVector<tomp::DirectiveWithClauses<Fortran::lower::omp::Clause>, 0u> const&, tomp::DirectiveWithClauses<Fortran::lower::omp::Clause> const*) OpenMP.cpp:0:0
 #8 0x0000000004a54a5d genOMPDispatch(Fortran::lower::AbstractConverter&, Fortran::lower::SymMap&, Fortran::semantics::SemanticsContext&, Fortran::lower::pft::Evaluation&, mlir::Location, llvm::SmallVector<tomp::DirectiveWithClauses<Fortran::lower::omp::Clause>, 0u> const&, tomp::DirectiveWithClauses<Fortran::lower::omp::Clause> const*) OpenMP.cpp:0:0
 #9 0x0000000004a4a261 createBodyOfOp(mlir::Operation&, OpWithBodyGenInfo const&, llvm::SmallVector<tomp::DirectiveWithClauses<Fortran::lower::omp::Clause>, 0u> const&, tomp::DirectiveWithClauses<Fortran::lower::omp::Clause> const*) OpenMP.cpp:0:0
#10 0x0000000004a4b4ec genParallelOp(Fortran::lower::AbstractConverter&, Fortran::lower::SymMap&, Fortran::semantics::SemanticsContext&, Fortran::lower::pft::Evaluation&, mlir::Location, llvm::SmallVector<tomp::DirectiveWithClauses<Fortran::lower::omp::Clause>, 0u> const&, tomp::DirectiveWithClauses<Fortran::lower::omp::Clause> const*, mlir::omp::detail::Clauses<mlir::omp::AllocateClauseOps, mlir::omp::IfClauseOps, mlir::omp::NumThreadsClauseOps, mlir::omp::PrivateClauseOps, mlir::omp::ProcBindClauseOps, mlir::omp::ReductionClauseOps>&, Fortran::common::openmp::EntryBlockArgs const&, Fortran::lower::omp::DataSharingProcessor*, bool) OpenMP.cpp:0:0
#11 0x0000000004a4b8b3 genStandaloneParallel(Fortran::lower::AbstractConverter&, Fortran::lower::SymMap&, Fortran::lower::StatementContext&, Fortran::semantics::SemanticsContext&, Fortran::lower::pft::Evaluation&, mlir::Location, llvm::SmallVector<tomp::DirectiveWithClauses<Fortran::lower::omp::Clause>, 0u> const&, tomp::DirectiveWithClauses<Fortran::lower::omp::Clause> const*) OpenMP.cpp:0:0
#12 0x0000000004a54142 genOMPDispatch(Fortran::lower::AbstractConverter&, Fortran::lower::SymMap&, Fortran::semantics::SemanticsContext&, Fortran::lower::pft::Evaluation&, mlir::Location, llvm::SmallVector<tomp::DirectiveWithClauses<Fortran::lower::omp::Clause>, 0u> const&, tomp::DirectiveWithClauses<Fortran::lower::omp::Clause> const*) OpenMP.cpp:0:0
#13 0x0000000004a584f4 Fortran::lower::genOpenMPConstruct(Fortran::lower::AbstractConverter&, Fortran::lower::SymMap&, Fortran::semantics::SemanticsContext&, Fortran::lower::pft::Evaluation&, Fortran::parser::OpenMPConstruct const&) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x4a584f4)
#14 0x00000000046fce90 void Fortran::common::log2visit::Log2VisitHelper<47ul, 93ul, void, Fortran::common::visitors<auto Fortran::lower::pft::ReferenceVariantBase<true, Fortran::parser::AllocateStmt, Fortran::parser::AssignmentStmt, Fortran::parser::BackspaceStmt, Fortran::parser::CallStmt, Fortran::parser::CloseStmt, Fortran::parser::ContinueStmt, Fortran::parser::CycleStmt, Fortran::parser::DeallocateStmt, Fortran::parser::EndfileStmt, Fortran::parser::EventPostStmt, Fortran::parser::EventWaitStmt, Fortran::parser::ExitStmt, Fortran::parser::FailImageStmt, Fortran::parser::FlushStmt, Fortran::parser::FormTeamStmt, Fortran::parser::GotoStmt, Fortran::parser::IfStmt, Fortran::parser::InquireStmt, Fortran::parser::LockStmt, Fortran::parser::NotifyWaitStmt, Fortran::parser::NullifyStmt, Fortran::parser::OpenStmt, Fortran::parser::PointerAssignmentStmt, Fortran::parser::PrintStmt, Fortran::parser::ReadStmt, Fortran::parser::ReturnStmt, Fortran::parser::RewindStmt, Fortran::parser::StopStmt, Fortran::parser::SyncAllStmt, Fortran::parser::SyncImagesStmt, Fortran::parser::SyncMemoryStmt, Fortran::parser::SyncTeamStmt, Fortran::parser::UnlockStmt, Fortran::parser::WaitStmt, Fortran::parser::WhereStmt, Fortran::parser::WriteStmt, Fortran::parser::ComputedGotoStmt, Fortran::parser::ForallStmt, Fortran::parser::ArithmeticIfStmt, Fortran::parser::AssignStmt, Fortran::parser::AssignedGotoStmt, Fortran::parser::PauseStmt, Fortran::parser::EntryStmt, Fortran::parser::FormatStmt, Fortran::parser::AssociateStmt, Fortran::parser::EndAssociateStmt, Fortran::parser::BlockStmt, Fortran::parser::EndBlockStmt, Fortran::parser::SelectCaseStmt, Fortran::parser::CaseStmt, Fortran::parser::EndSelectStmt, Fortran::parser::ChangeTeamStmt, Fortran::parser::EndChangeTeamStmt, Fortran::parser::CriticalStmt, Fortran::parser::EndCriticalStmt, Fortran::parser::NonLabelDoStmt, Fortran::parser::EndDoStmt, Fortran::parser::IfThenStmt, Fortran::parser::ElseIfStmt, Fortran::parser::ElseStmt, Fortran::parser::EndIfStmt, Fortran::parser::SelectRankStmt, Fortran::parser::SelectRankCaseStmt, Fortran::parser::SelectTypeStmt, Fortran::parser::TypeGuardStmt, Fortran::parser::WhereConstructStmt, Fortran::parser::MaskedElsewhereStmt, Fortran::parser::ElsewhereStmt, Fortran::parser::EndWhereStmt, Fortran::parser::ForallConstructStmt, Fortran::parser::EndForallStmt, Fortran::parser::EndProgramStmt, Fortran::parser::EndFunctionStmt, Fortran::parser::EndSubroutineStmt, Fortran::parser::EndMpSubprogramStmt, Fortran::parser::AssociateConstruct, Fortran::parser::BlockConstruct, Fortran::parser::CaseConstruct, Fortran::parser::ChangeTeamConstruct, Fortran::parser::CriticalConstruct, Fortran::parser::DoConstruct, Fortran::parser::IfConstruct, Fortran::parser::SelectRankConstruct, Fortran::parser::SelectTypeConstruct, Fortran::parser::WhereConstruct, Fortran::parser::ForallConstruct, Fortran::parser::CompilerDirective, Fortran::parser::OpenACCConstruct, Fortran::parser::OpenACCRoutineConstruct, Fortran::parser::OpenACCDeclarativeConstruct, Fortran::parser::OpenMPConstruct, Fortran::parser::OpenMPDeclarativeConstruct, Fortran::parser::OmpEndLoopDirective, Fortran::parser::CUFKernelDoConstruct>::visit<(anonymous namespace)::FirConverter::genFIR(Fortran::lower::pft::Evaluation&, bool)::'lambda'(auto const&)>(auto&&) const::'lambda'(auto)>, std::variant<Fortran::common::Reference<Fortran::parser::AllocateStmt const>, Fortran::common::Reference<Fortran::parser::AssignmentStmt const>, Fortran::common::Reference<Fortran::parser::BackspaceStmt const>, Fortran::common::Reference<Fortran::parser::CallStmt const>, Fortran::common::Reference<Fortran::parser::CloseStmt const>, Fortran::common::Reference<Fortran::parser::ContinueStmt const>, Fortran::common::Reference<Fortran::parser::CycleStmt const>, Fortran::common::Reference<Fortran::parser::DeallocateStmt const>, Fortran::common::Reference<Fortran::parser::EndfileStmt const>, Fortran::common::Reference<Fortran::parser::EventPostStmt const>, Fortran::common::Reference<Fortran::parser::EventWaitStmt const>, Fortran::common::Reference<Fortran::parser::ExitStmt const>, Fortran::common::Reference<Fortran::parser::FailImageStmt const>, Fortran::common::Reference<Fortran::parser::FlushStmt const>, Fortran::common::Reference<Fortran::parser::FormTeamStmt const>, Fortran::common::Reference<Fortran::parser::GotoStmt const>, Fortran::common::Reference<Fortran::parser::IfStmt const>, Fortran::common::Reference<Fortran::parser::InquireStmt const>, Fortran::common::Reference<Fortran::parser::LockStmt const>, Fortran::common::Reference<Fortran::parser::NotifyWaitStmt const>, Fortran::common::Reference<Fortran::parser::NullifyStmt const>, Fortran::common::Reference<Fortran::parser::OpenStmt const>, Fortran::common::Reference<Fortran::parser::PointerAssignmentStmt const>, Fortran::common::Reference<Fortran::parser::PrintStmt const>, Fortran::common::Reference<Fortran::parser::ReadStmt const>, Fortran::common::Reference<Fortran::parser::ReturnStmt const>, Fortran::common::Reference<Fortran::parser::RewindStmt const>, Fortran::common::Reference<Fortran::parser::StopStmt const>, Fortran::common::Reference<Fortran::parser::SyncAllStmt const>, Fortran::common::Reference<Fortran::parser::SyncImagesStmt const>, Fortran::common::Reference<Fortran::parser::SyncMemoryStmt const>, Fortran::common::Reference<Fortran::parser::SyncTeamStmt const>, Fortran::common::Reference<Fortran::parser::UnlockStmt const>, Fortran::common::Reference<Fortran::parser::WaitStmt const>, Fortran::common::Reference<Fortran::parser::WhereStmt const>, Fortran::common::Reference<Fortran::parser::WriteStmt const>, Fortran::common::Reference<Fortran::parser::ComputedGotoStmt const>, Fortran::common::Reference<Fortran::parser::ForallStmt const>, Fortran::common::Reference<Fortran::parser::ArithmeticIfStmt const>, Fortran::common::Reference<Fortran::parser::AssignStmt const>, Fortran::common::Reference<Fortran::parser::AssignedGotoStmt const>, Fortran::common::Reference<Fortran::parser::PauseStmt const>, Fortran::common::Reference<Fortran::parser::EntryStmt const>, Fortran::common::Reference<Fortran::parser::FormatStmt const>, Fortran::common::Reference<Fortran::parser::AssociateStmt const>, Fortran::common::Reference<Fortran::parser::EndAssociateStmt const>, Fortran::common::Reference<Fortran::parser::BlockStmt const>, Fortran::common::Reference<Fortran::parser::EndBlockStmt const>, Fortran::common::Reference<Fortran::parser::SelectCaseStmt const>, Fortran::common::Reference<Fortran::parser::CaseStmt const>, Fortran::common::Reference<Fortran::parser::EndSelectStmt const>, Fortran::common::Reference<Fortran::parser::ChangeTeamStmt const>, Fortran::common::Reference<Fortran::parser::EndChangeTeamStmt const>, Fortran::common::Reference<Fortran::parser::CriticalStmt const>, Fortran::common::Reference<Fortran::parser::EndCriticalStmt const>, Fortran::common::Reference<Fortran::parser::NonLabelDoStmt const>, Fortran::common::Reference<Fortran::parser::EndDoStmt const>, Fortran::common::Reference<Fortran::parser::IfThenStmt const>, Fortran::common::Reference<Fortran::parser::ElseIfStmt const>, Fortran::common::Reference<Fortran::parser::ElseStmt const>, Fortran::common::Reference<Fortran::parser::EndIfStmt const>, Fortran::common::Reference<Fortran::parser::SelectRankStmt const>, Fortran::common::Reference<Fortran::parser::SelectRankCaseStmt const>, Fortran::common::Reference<Fortran::parser::SelectTypeStmt const>, Fortran::common::Reference<Fortran::parser::TypeGuardStmt const>, Fortran::common::Reference<Fortran::parser::WhereConstructStmt const>, Fortran::common::Reference<Fortran::parser::MaskedElsewhereStmt const>, Fortran::common::Reference<Fortran::parser::ElsewhereStmt const>, Fortran::common::Reference<Fortran::parser::EndWhereStmt const>, Fortran::common::Reference<Fortran::parser::ForallConstructStmt const>, Fortran::common::Reference<Fortran::parser::EndForallStmt const>, Fortran::common::Reference<Fortran::parser::EndProgramStmt const>, Fortran::common::Reference<Fortran::parser::EndFunctionStmt const>, Fortran::common::Reference<Fortran::parser::EndSubroutineStmt const>, Fortran::common::Reference<Fortran::parser::EndMpSubprogramStmt const>, Fortran::common::Reference<Fortran::parser::AssociateConstruct const>, Fortran::common::Reference<Fortran::parser::BlockConstruct const>, Fortran::common::Reference<Fortran::parser::CaseConstruct const>, Fortran::common::Reference<Fortran::parser::ChangeTeamConstruct const>, Fortran::common::Reference<Fortran::parser::CriticalConstruct const>, Fortran::common::Reference<Fortran::parser::DoConstruct const>, Fortran::common::Reference<Fortran::parser::IfConstruct const>, Fortran::common::Reference<Fortran::parser::SelectRankConstruct const>, Fortran::common::Reference<Fortran::parser::SelectTypeConstruct const>, Fortran::common::Reference<Fortran::parser::WhereConstruct const>, Fortran::common::Reference<Fortran::parser::ForallConstruct const>, Fortran::common::Reference<Fortran::parser::CompilerDirective const>, Fortran::common::Reference<Fortran::parser::OpenACCConstruct const>, Fortran::common::Reference<Fortran::parser::OpenACCRoutineConstruct const>, Fortran::common::Reference<Fortran::parser::OpenACCDeclarativeConstruct const>, Fortran::common::Reference<Fortran::parser::OpenMPConstruct const>, Fortran::common::Reference<Fortran::parser::OpenMPDeclarativeConstruct const>, Fortran::common::Reference<Fortran::parser::OmpEndLoopDirective const>, Fortran::common::Reference<Fortran::parser::CUFKernelDoConstruct const>> const&>(Fortran::common::visitors<auto Fortran::lower::pft::ReferenceVariantBase<true, Fortran::parser::AllocateStmt, Fortran::parser::AssignmentStmt, Fortran::parser::BackspaceStmt, Fortran::parser::CallStmt, Fortran::parser::CloseStmt, Fortran::parser::ContinueStmt, Fortran::parser::CycleStmt, Fortran::parser::DeallocateStmt, Fortran::parser::EndfileStmt, Fortran::parser::EventPostStmt, Fortran::parser::EventWaitStmt, Fortran::parser::ExitStmt, Fortran::parser::FailImageStmt, Fortran::parser::FlushStmt, Fortran::parser::FormTeamStmt, Fortran::parser::GotoStmt, Fortran::parser::IfStmt, Fortran::parser::InquireStmt, Fortran::parser::LockStmt, Fortran::parser::NotifyWaitStmt, Fortran::parser::NullifyStmt, Fortran::parser::OpenStmt, Fortran::parser::PointerAssignmentStmt, Fortran::parser::PrintStmt, Fortran::parser::ReadStmt, Fortran::parser::ReturnStmt, Fortran::parser::RewindStmt, Fortran::parser::StopStmt, Fortran::parser::SyncAllStmt, Fortran::parser::SyncImagesStmt, Fortran::parser::SyncMemoryStmt, Fortran::parser::SyncTeamStmt, Fortran::parser::UnlockStmt, Fortran::parser::WaitStmt, Fortran::parser::WhereStmt, Fortran::parser::WriteStmt, Fortran::parser::ComputedGotoStmt, Fortran::parser::ForallStmt, Fortran::parser::ArithmeticIfStmt, Fortran::parser::AssignStmt, Fortran::parser::AssignedGotoStmt, Fortran::parser::PauseStmt, Fortran::parser::EntryStmt, Fortran::parser::FormatStmt, Fortran::parser::AssociateStmt, Fortran::parser::EndAssociateStmt, Fortran::parser::BlockStmt, Fortran::parser::EndBlockStmt, Fortran::parser::SelectCaseStmt, Fortran::parser::CaseStmt, Fortran::parser::EndSelectStmt, Fortran::parser::ChangeTeamStmt, Fortran::parser::EndChangeTeamStmt, Fortran::parser::CriticalStmt, Fortran::parser::EndCriticalStmt, Fortran::parser::NonLabelDoStmt, Fortran::parser::EndDoStmt, Fortran::parser::IfThenStmt, Fortran::parser::ElseIfStmt, Fortran::parser::ElseStmt, Fortran::parser::EndIfStmt, Fortran::parser::SelectRankStmt, Fortran::parser::SelectRankCaseStmt, Fortran::parser::SelectTypeStmt, Fortran::parser::TypeGuardStmt, Fortran::parser::WhereConstructStmt, Fortran::parser::MaskedElsewhereStmt, Fortran::parser::ElsewhereStmt, Fortran::parser::EndWhereStmt, Fortran::parser::ForallConstructStmt, Fortran::parser::EndForallStmt, Fortran::parser::EndProgramStmt, Fortran::parser::EndFunctionStmt, Fortran::parser::EndSubroutineStmt, Fortran::parser::EndMpSubprogramStmt, Fortran::parser::AssociateConstruct, Fortran::parser::BlockConstruct, Fortran::parser::CaseConstruct, Fortran::parser::ChangeTeamConstruct, Fortran::parser::CriticalConstruct, Fortran::parser::DoConstruct, Fortran::parser::IfConstruct, Fortran::parser::SelectRankConstruct, Fortran::parser::SelectTypeConstruct, Fortran::parser::WhereConstruct, Fortran::parser::ForallConstruct, Fortran::parser::CompilerDirective, Fortran::parser::OpenACCConstruct, Fortran::parser::OpenACCRoutineConstruct, Fortran::parser::OpenACCDeclarativeConstruct, Fortran::parser::OpenMPConstruct, Fortran::parser::OpenMPDeclarativeConstruct, Fortran::parser::OmpEndLoopDirective, Fortran::parser::CUFKernelDoConstruct>::visit<(anonymous namespace)::FirConverter::genFIR(Fortran::lower::pft::Evaluation&, bool)::'lambda'(auto const&)>(auto&&) const::'lambda'(auto)>&&, unsigned long, std::variant<Fortran::common::Reference<Fortran::parser::AllocateStmt const>, Fortran::common::Reference<Fortran::parser::AssignmentStmt const>, Fortran::common::Reference<Fortran::parser::BackspaceStmt const>, Fortran::common::Reference<Fortran::parser::CallStmt const>, Fortran::common::Reference<Fortran::parser::CloseStmt const>, Fortran::common::Reference<Fortran::parser::ContinueStmt const>, Fortran::common::Reference<Fortran::parser::CycleStmt const>, Fortran::common::Reference<Fortran::parser::DeallocateStmt const>, Fortran::common::Reference<Fortran::parser::EndfileStmt const>, Fortran::common::Reference<Fortran::parser::EventPostStmt const>, Fortran::common::Reference<Fortran::parser::EventWaitStmt const>, Fortran::common::Reference<Fortran::parser::ExitStmt const>, Fortran::common::Reference<Fortran::parser::FailImageStmt const>, Fortran::common::Reference<Fortran::parser::FlushStmt const>, Fortran::common::Reference<Fortran::parser::FormTeamStmt const>, Fortran::common::Reference<Fortran::parser::GotoStmt const>, Fortran::common::Reference<Fortran::parser::IfStmt const>, Fortran::common::Reference<Fortran::parser::InquireStmt const>, Fortran::common::Reference<Fortran::parser::LockStmt const>, Fortran::common::Reference<Fortran::parser::NotifyWaitStmt const>, Fortran::common::Reference<Fortran::parser::NullifyStmt const>, Fortran::common::Reference<Fortran::parser::OpenStmt const>, Fortran::common::Reference<Fortran::parser::PointerAssignmentStmt const>, Fortran::common::Reference<Fortran::parser::PrintStmt const>, Fortran::common::Reference<Fortran::parser::ReadStmt const>, Fortran::common::Reference<Fortran::parser::ReturnStmt const>, Fortran::common::Reference<Fortran::parser::RewindStmt const>, Fortran::common::Reference<Fortran::parser::StopStmt const>, Fortran::common::Reference<Fortran::parser::SyncAllStmt const>, Fortran::common::Reference<Fortran::parser::SyncImagesStmt const>, Fortran::common::Reference<Fortran::parser::SyncMemoryStmt const>, Fortran::common::Reference<Fortran::parser::SyncTeamStmt const>, Fortran::common::Reference<Fortran::parser::UnlockStmt const>, Fortran::common::Reference<Fortran::parser::WaitStmt const>, Fortran::common::Reference<Fortran::parser::WhereStmt const>, Fortran::common::Reference<Fortran::parser::WriteStmt const>, Fortran::common::Reference<Fortran::parser::ComputedGotoStmt const>, Fortran::common::Reference<Fortran::parser::ForallStmt const>, Fortran::common::Reference<Fortran::parser::ArithmeticIfStmt const>, Fortran::common::Reference<Fortran::parser::AssignStmt const>, Fortran::common::Reference<Fortran::parser::AssignedGotoStmt const>, Fortran::common::Reference<Fortran::parser::PauseStmt const>, Fortran::common::Reference<Fortran::parser::EntryStmt const>, Fortran::common::Reference<Fortran::parser::FormatStmt const>, Fortran::common::Reference<Fortran::parser::AssociateStmt const>, Fortran::common::Reference<Fortran::parser::EndAssociateStmt const>, Fortran::common::Reference<Fortran::parser::BlockStmt const>, Fortran::common::Reference<Fortran::parser::EndBlockStmt const>, Fortran::common::Reference<Fortran::parser::SelectCaseStmt const>, Fortran::common::Reference<Fortran::parser::CaseStmt const>, Fortran::common::Reference<Fortran::parser::EndSelectStmt const>, Fortran::common::Reference<Fortran::parser::ChangeTeamStmt const>, Fortran::common::Reference<Fortran::parser::EndChangeTeamStmt const>, Fortran::common::Reference<Fortran::parser::CriticalStmt const>, Fortran::common::Reference<Fortran::parser::EndCriticalStmt const>, Fortran::common::Reference<Fortran::parser::NonLabelDoStmt const>, Fortran::common::Reference<Fortran::parser::EndDoStmt const>, Fortran::common::Reference<Fortran::parser::IfThenStmt const>, Fortran::common::Reference<Fortran::parser::ElseIfStmt const>, Fortran::common::Reference<Fortran::parser::ElseStmt const>, Fortran::common::Reference<Fortran::parser::EndIfStmt const>, Fortran::common::Reference<Fortran::parser::SelectRankStmt const>, Fortran::common::Reference<Fortran::parser::SelectRankCaseStmt const>, Fortran::common::Reference<Fortran::parser::SelectTypeStmt const>, Fortran::common::Reference<Fortran::parser::TypeGuardStmt const>, Fortran::common::Reference<Fortran::parser::WhereConstructStmt const>, Fortran::common::Reference<Fortran::parser::MaskedElsewhereStmt const>, Fortran::common::Reference<Fortran::parser::ElsewhereStmt const>, Fortran::common::Reference<Fortran::parser::EndWhereStmt const>, Fortran::common::Reference<Fortran::parser::ForallConstructStmt const>, Fortran::common::Reference<Fortran::parser::EndForallStmt const>, Fortran::common::Reference<Fortran::parser::EndProgramStmt const>, Fortran::common::Reference<Fortran::parser::EndFunctionStmt const>, Fortran::common::Reference<Fortran::parser::EndSubroutineStmt const>, Fortran::common::Reference<Fortran::parser::EndMpSubprogramStmt const>, Fortran::common::Reference<Fortran::parser::AssociateConstruct const>, Fortran::common::Reference<Fortran::parser::BlockConstruct const>, Fortran::common::Reference<Fortran::parser::CaseConstruct const>, Fortran::common::Reference<Fortran::parser::ChangeTeamConstruct const>, Fortran::common::Reference<Fortran::parser::CriticalConstruct const>, Fortran::common::Reference<Fortran::parser::DoConstruct const>, Fortran::common::Reference<Fortran::parser::IfConstruct const>, Fortran::common::Reference<Fortran::parser::SelectRankConstruct const>, Fortran::common::Reference<Fortran::parser::SelectTypeConstruct const>, Fortran::common::Reference<Fortran::parser::WhereConstruct const>, Fortran::common::Reference<Fortran::parser::ForallConstruct const>, Fortran::common::Reference<Fortran::parser::CompilerDirective const>, Fortran::common::Reference<Fortran::parser::OpenACCConstruct const>, Fortran::common::Reference<Fortran::parser::OpenACCRoutineConstruct const>, Fortran::common::Reference<Fortran::parser::OpenACCDeclarativeConstruct const>, Fortran::common::Reference<Fortran::parser::OpenMPConstruct const>, Fortran::common::Reference<Fortran::parser::OpenMPDeclarativeConstruct const>, Fortran::common::Reference<Fortran::parser::OmpEndLoopDirective const>, Fortran::common::Reference<Fortran::parser::CUFKernelDoConstruct const>> const&) Bridge.cpp:0:0
#15 0x00000000046fd224 (anonymous namespace)::FirConverter::genFIR(Fortran::lower::pft::Evaluation&, bool) (.constprop.0) Bridge.cpp:0:0
#16 0x0000000004702ebc (anonymous namespace)::FirConverter::lowerFunc(Fortran::lower::pft::FunctionLikeUnit&) Bridge.cpp:0:0
#17 0x00000000047046d4 Fortran::lower::LoweringBridge::lower(Fortran::parser::Program const&, Fortran::semantics::SemanticsContext const&) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x47046d4)
#18 0x0000000004580dcd Fortran::frontend::CodeGenAction::beginSourceFileAction() (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x4580dcd)
#19 0x00000000042e0db5 Fortran::frontend::FrontendAction::beginSourceFile(Fortran::frontend::CompilerInstance&, Fortran::frontend::FrontendInputFile const&) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x42e0db5)
#20 0x00000000042ce4ef Fortran::frontend::CompilerInstance::executeAction(Fortran::frontend::FrontendAction&) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x42ce4ef)
#21 0x00000000042ea703 Fortran::frontend::executeCompilerInvocation(Fortran::frontend::CompilerInstance*) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x42ea703)
#22 0x00000000025ce412 fc1_main(llvm::ArrayRef<char const*>, char const*) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x25ce412)
#23 0x00000000024652b1 main (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x24652b1)
#24 0x000074763cc29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#25 0x000074763cc29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#26 0x00000000025cce05 _start (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x25cce05)
flang-22: error: unable to execute command: Segmentation fault (core dumped)
flang-22: error: flang frontend command failed due to signal (use -v to see invocation)
flang version 22.0.0git (https://github.com/llvm/llvm-project.git 12f42e5ed9286711287e17ec35ea9bbdeb2aa92e)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin

[llvmbot]

@llvm/issue-subscribers-flang-ir

Author: None (k-arrows)

Reproducer: https://godbolt.org/z/r9xzx4xPn ```f90 module m integer :: n end module program p integer :: i !$omp parallel do do i=1,2 block use m do n=1,2 end do end block end do end program p ```

Backtrace:

PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
Stack dump:
0.	Program arguments: /cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang -fc1 -triple x86_64-unknown-linux-gnu -S -mrelocation-model pic -pic-level 2 -pic-is-pie -target-cpu x86-64 -mllvm -x86-asm-syntax=intel -fopenmp -resource-dir /cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/lib/clang/22 -mframe-pointer=all -o /app/output.s -x f95 /app/example.f90
 #<!-- -->0 0x0000000004282c48 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x4282c48)
 #<!-- -->1 0x000000000427fe14 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
 #<!-- -->2 0x000074763cc42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->3 0x000000000a1678b3 mlir::Value::getLoc() const (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0xa1678b3)
 #<!-- -->4 0x0000000004b0e5e9 void Fortran::lower::privatizeSymbol&lt;mlir::omp::PrivateClauseOp, mlir::omp::PrivateClauseOps&gt;(Fortran::lower::AbstractConverter&amp;, fir::FirOpBuilder&amp;, Fortran::lower::SymMap&amp;, llvm::SetVector&lt;Fortran::semantics::Symbol const*, llvm::SmallVector&lt;Fortran::semantics::Symbol const*, 0u&gt;, llvm::DenseSet&lt;Fortran::semantics::Symbol const*, llvm::DenseMapInfo&lt;Fortran::semantics::Symbol const*, void&gt;&gt;, 0u&gt;&amp;, llvm::SmallPtrSet&lt;Fortran::semantics::Symbol const*, 16u&gt;&amp;, Fortran::semantics::Symbol const*, mlir::omp::PrivateClauseOps*, std::optional&lt;llvm::omp::Directive&gt;) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x4b0e5e9)
 #<!-- -->5 0x0000000004baee22 Fortran::lower::omp::DataSharingProcessor::privatize(mlir::omp::PrivateClauseOps*, std::optional&lt;llvm::omp::Directive&gt;) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x4baee22)
 #<!-- -->6 0x0000000004bb158b Fortran::lower::omp::DataSharingProcessor::processStep1(mlir::omp::PrivateClauseOps*, std::optional&lt;llvm::omp::Directive&gt;) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x4bb158b)
 #<!-- -->7 0x0000000004a4f2b2 genStandaloneDo(Fortran::lower::AbstractConverter&amp;, Fortran::lower::SymMap&amp;, Fortran::lower::StatementContext&amp;, Fortran::semantics::SemanticsContext&amp;, Fortran::lower::pft::Evaluation&amp;, mlir::Location, llvm::SmallVector&lt;tomp::DirectiveWithClauses&lt;Fortran::lower::omp::Clause&gt;, 0u&gt; const&amp;, tomp::DirectiveWithClauses&lt;Fortran::lower::omp::Clause&gt; const*) OpenMP.cpp:0:0
 #<!-- -->8 0x0000000004a54a5d genOMPDispatch(Fortran::lower::AbstractConverter&amp;, Fortran::lower::SymMap&amp;, Fortran::semantics::SemanticsContext&amp;, Fortran::lower::pft::Evaluation&amp;, mlir::Location, llvm::SmallVector&lt;tomp::DirectiveWithClauses&lt;Fortran::lower::omp::Clause&gt;, 0u&gt; const&amp;, tomp::DirectiveWithClauses&lt;Fortran::lower::omp::Clause&gt; const*) OpenMP.cpp:0:0
 #<!-- -->9 0x0000000004a4a261 createBodyOfOp(mlir::Operation&amp;, OpWithBodyGenInfo const&amp;, llvm::SmallVector&lt;tomp::DirectiveWithClauses&lt;Fortran::lower::omp::Clause&gt;, 0u&gt; const&amp;, tomp::DirectiveWithClauses&lt;Fortran::lower::omp::Clause&gt; const*) OpenMP.cpp:0:0
#<!-- -->10 0x0000000004a4b4ec genParallelOp(Fortran::lower::AbstractConverter&amp;, Fortran::lower::SymMap&amp;, Fortran::semantics::SemanticsContext&amp;, Fortran::lower::pft::Evaluation&amp;, mlir::Location, llvm::SmallVector&lt;tomp::DirectiveWithClauses&lt;Fortran::lower::omp::Clause&gt;, 0u&gt; const&amp;, tomp::DirectiveWithClauses&lt;Fortran::lower::omp::Clause&gt; const*, mlir::omp::detail::Clauses&lt;mlir::omp::AllocateClauseOps, mlir::omp::IfClauseOps, mlir::omp::NumThreadsClauseOps, mlir::omp::PrivateClauseOps, mlir::omp::ProcBindClauseOps, mlir::omp::ReductionClauseOps&gt;&amp;, Fortran::common::openmp::EntryBlockArgs const&amp;, Fortran::lower::omp::DataSharingProcessor*, bool) OpenMP.cpp:0:0
#<!-- -->11 0x0000000004a4b8b3 genStandaloneParallel(Fortran::lower::AbstractConverter&amp;, Fortran::lower::SymMap&amp;, Fortran::lower::StatementContext&amp;, Fortran::semantics::SemanticsContext&amp;, Fortran::lower::pft::Evaluation&amp;, mlir::Location, llvm::SmallVector&lt;tomp::DirectiveWithClauses&lt;Fortran::lower::omp::Clause&gt;, 0u&gt; const&amp;, tomp::DirectiveWithClauses&lt;Fortran::lower::omp::Clause&gt; const*) OpenMP.cpp:0:0
#<!-- -->12 0x0000000004a54142 genOMPDispatch(Fortran::lower::AbstractConverter&amp;, Fortran::lower::SymMap&amp;, Fortran::semantics::SemanticsContext&amp;, Fortran::lower::pft::Evaluation&amp;, mlir::Location, llvm::SmallVector&lt;tomp::DirectiveWithClauses&lt;Fortran::lower::omp::Clause&gt;, 0u&gt; const&amp;, tomp::DirectiveWithClauses&lt;Fortran::lower::omp::Clause&gt; const*) OpenMP.cpp:0:0
#<!-- -->13 0x0000000004a584f4 Fortran::lower::genOpenMPConstruct(Fortran::lower::AbstractConverter&amp;, Fortran::lower::SymMap&amp;, Fortran::semantics::SemanticsContext&amp;, Fortran::lower::pft::Evaluation&amp;, Fortran::parser::OpenMPConstruct const&amp;) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x4a584f4)
#<!-- -->14 0x00000000046fce90 void Fortran::common::log2visit::Log2VisitHelper&lt;47ul, 93ul, void, Fortran::common::visitors&lt;auto Fortran::lower::pft::ReferenceVariantBase&lt;true, Fortran::parser::AllocateStmt, Fortran::parser::AssignmentStmt, Fortran::parser::BackspaceStmt, Fortran::parser::CallStmt, Fortran::parser::CloseStmt, Fortran::parser::ContinueStmt, Fortran::parser::CycleStmt, Fortran::parser::DeallocateStmt, Fortran::parser::EndfileStmt, Fortran::parser::EventPostStmt, Fortran::parser::EventWaitStmt, Fortran::parser::ExitStmt, Fortran::parser::FailImageStmt, Fortran::parser::FlushStmt, Fortran::parser::FormTeamStmt, Fortran::parser::GotoStmt, Fortran::parser::IfStmt, Fortran::parser::InquireStmt, Fortran::parser::LockStmt, Fortran::parser::NotifyWaitStmt, Fortran::parser::NullifyStmt, Fortran::parser::OpenStmt, Fortran::parser::PointerAssignmentStmt, Fortran::parser::PrintStmt, Fortran::parser::ReadStmt, Fortran::parser::ReturnStmt, Fortran::parser::RewindStmt, Fortran::parser::StopStmt, Fortran::parser::SyncAllStmt, Fortran::parser::SyncImagesStmt, Fortran::parser::SyncMemoryStmt, Fortran::parser::SyncTeamStmt, Fortran::parser::UnlockStmt, Fortran::parser::WaitStmt, Fortran::parser::WhereStmt, Fortran::parser::WriteStmt, Fortran::parser::ComputedGotoStmt, Fortran::parser::ForallStmt, Fortran::parser::ArithmeticIfStmt, Fortran::parser::AssignStmt, Fortran::parser::AssignedGotoStmt, Fortran::parser::PauseStmt, Fortran::parser::EntryStmt, Fortran::parser::FormatStmt, Fortran::parser::AssociateStmt, Fortran::parser::EndAssociateStmt, Fortran::parser::BlockStmt, Fortran::parser::EndBlockStmt, Fortran::parser::SelectCaseStmt, Fortran::parser::CaseStmt, Fortran::parser::EndSelectStmt, Fortran::parser::ChangeTeamStmt, Fortran::parser::EndChangeTeamStmt, Fortran::parser::CriticalStmt, Fortran::parser::EndCriticalStmt, Fortran::parser::NonLabelDoStmt, Fortran::parser::EndDoStmt, Fortran::parser::IfThenStmt, Fortran::parser::ElseIfStmt, Fortran::parser::ElseStmt, Fortran::parser::EndIfStmt, Fortran::parser::SelectRankStmt, Fortran::parser::SelectRankCaseStmt, Fortran::parser::SelectTypeStmt, Fortran::parser::TypeGuardStmt, Fortran::parser::WhereConstructStmt, Fortran::parser::MaskedElsewhereStmt, Fortran::parser::ElsewhereStmt, Fortran::parser::EndWhereStmt, Fortran::parser::ForallConstructStmt, Fortran::parser::EndForallStmt, Fortran::parser::EndProgramStmt, Fortran::parser::EndFunctionStmt, Fortran::parser::EndSubroutineStmt, Fortran::parser::EndMpSubprogramStmt, Fortran::parser::AssociateConstruct, Fortran::parser::BlockConstruct, Fortran::parser::CaseConstruct, Fortran::parser::ChangeTeamConstruct, Fortran::parser::CriticalConstruct, Fortran::parser::DoConstruct, Fortran::parser::IfConstruct, Fortran::parser::SelectRankConstruct, Fortran::parser::SelectTypeConstruct, Fortran::parser::WhereConstruct, Fortran::parser::ForallConstruct, Fortran::parser::CompilerDirective, Fortran::parser::OpenACCConstruct, Fortran::parser::OpenACCRoutineConstruct, Fortran::parser::OpenACCDeclarativeConstruct, Fortran::parser::OpenMPConstruct, Fortran::parser::OpenMPDeclarativeConstruct, Fortran::parser::OmpEndLoopDirective, Fortran::parser::CUFKernelDoConstruct&gt;::visit&lt;(anonymous namespace)::FirConverter::genFIR(Fortran::lower::pft::Evaluation&amp;, bool)::'lambda'(auto const&amp;)&gt;(auto&amp;&amp;) const::'lambda'(auto)&gt;, std::variant&lt;Fortran::common::Reference&lt;Fortran::parser::AllocateStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::AssignmentStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::BackspaceStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::CallStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::CloseStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ContinueStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::CycleStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::DeallocateStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndfileStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EventPostStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EventWaitStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ExitStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::FailImageStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::FlushStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::FormTeamStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::GotoStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::IfStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::InquireStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::LockStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::NotifyWaitStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::NullifyStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::OpenStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::PointerAssignmentStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::PrintStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ReadStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ReturnStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::RewindStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::StopStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::SyncAllStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::SyncImagesStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::SyncMemoryStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::SyncTeamStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::UnlockStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::WaitStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::WhereStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::WriteStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ComputedGotoStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ForallStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ArithmeticIfStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::AssignStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::AssignedGotoStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::PauseStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EntryStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::FormatStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::AssociateStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndAssociateStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::BlockStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndBlockStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::SelectCaseStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::CaseStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndSelectStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ChangeTeamStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndChangeTeamStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::CriticalStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndCriticalStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::NonLabelDoStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndDoStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::IfThenStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ElseIfStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ElseStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndIfStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::SelectRankStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::SelectRankCaseStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::SelectTypeStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::TypeGuardStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::WhereConstructStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::MaskedElsewhereStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ElsewhereStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndWhereStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ForallConstructStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndForallStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndProgramStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndFunctionStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndSubroutineStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndMpSubprogramStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::AssociateConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::BlockConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::CaseConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::ChangeTeamConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::CriticalConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::DoConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::IfConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::SelectRankConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::SelectTypeConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::WhereConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::ForallConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::CompilerDirective const&gt;, Fortran::common::Reference&lt;Fortran::parser::OpenACCConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::OpenACCRoutineConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::OpenACCDeclarativeConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::OpenMPConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::OpenMPDeclarativeConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::OmpEndLoopDirective const&gt;, Fortran::common::Reference&lt;Fortran::parser::CUFKernelDoConstruct const&gt;&gt; const&amp;&gt;(Fortran::common::visitors&lt;auto Fortran::lower::pft::ReferenceVariantBase&lt;true, Fortran::parser::AllocateStmt, Fortran::parser::AssignmentStmt, Fortran::parser::BackspaceStmt, Fortran::parser::CallStmt, Fortran::parser::CloseStmt, Fortran::parser::ContinueStmt, Fortran::parser::CycleStmt, Fortran::parser::DeallocateStmt, Fortran::parser::EndfileStmt, Fortran::parser::EventPostStmt, Fortran::parser::EventWaitStmt, Fortran::parser::ExitStmt, Fortran::parser::FailImageStmt, Fortran::parser::FlushStmt, Fortran::parser::FormTeamStmt, Fortran::parser::GotoStmt, Fortran::parser::IfStmt, Fortran::parser::InquireStmt, Fortran::parser::LockStmt, Fortran::parser::NotifyWaitStmt, Fortran::parser::NullifyStmt, Fortran::parser::OpenStmt, Fortran::parser::PointerAssignmentStmt, Fortran::parser::PrintStmt, Fortran::parser::ReadStmt, Fortran::parser::ReturnStmt, Fortran::parser::RewindStmt, Fortran::parser::StopStmt, Fortran::parser::SyncAllStmt, Fortran::parser::SyncImagesStmt, Fortran::parser::SyncMemoryStmt, Fortran::parser::SyncTeamStmt, Fortran::parser::UnlockStmt, Fortran::parser::WaitStmt, Fortran::parser::WhereStmt, Fortran::parser::WriteStmt, Fortran::parser::ComputedGotoStmt, Fortran::parser::ForallStmt, Fortran::parser::ArithmeticIfStmt, Fortran::parser::AssignStmt, Fortran::parser::AssignedGotoStmt, Fortran::parser::PauseStmt, Fortran::parser::EntryStmt, Fortran::parser::FormatStmt, Fortran::parser::AssociateStmt, Fortran::parser::EndAssociateStmt, Fortran::parser::BlockStmt, Fortran::parser::EndBlockStmt, Fortran::parser::SelectCaseStmt, Fortran::parser::CaseStmt, Fortran::parser::EndSelectStmt, Fortran::parser::ChangeTeamStmt, Fortran::parser::EndChangeTeamStmt, Fortran::parser::CriticalStmt, Fortran::parser::EndCriticalStmt, Fortran::parser::NonLabelDoStmt, Fortran::parser::EndDoStmt, Fortran::parser::IfThenStmt, Fortran::parser::ElseIfStmt, Fortran::parser::ElseStmt, Fortran::parser::EndIfStmt, Fortran::parser::SelectRankStmt, Fortran::parser::SelectRankCaseStmt, Fortran::parser::SelectTypeStmt, Fortran::parser::TypeGuardStmt, Fortran::parser::WhereConstructStmt, Fortran::parser::MaskedElsewhereStmt, Fortran::parser::ElsewhereStmt, Fortran::parser::EndWhereStmt, Fortran::parser::ForallConstructStmt, Fortran::parser::EndForallStmt, Fortran::parser::EndProgramStmt, Fortran::parser::EndFunctionStmt, Fortran::parser::EndSubroutineStmt, Fortran::parser::EndMpSubprogramStmt, Fortran::parser::AssociateConstruct, Fortran::parser::BlockConstruct, Fortran::parser::CaseConstruct, Fortran::parser::ChangeTeamConstruct, Fortran::parser::CriticalConstruct, Fortran::parser::DoConstruct, Fortran::parser::IfConstruct, Fortran::parser::SelectRankConstruct, Fortran::parser::SelectTypeConstruct, Fortran::parser::WhereConstruct, Fortran::parser::ForallConstruct, Fortran::parser::CompilerDirective, Fortran::parser::OpenACCConstruct, Fortran::parser::OpenACCRoutineConstruct, Fortran::parser::OpenACCDeclarativeConstruct, Fortran::parser::OpenMPConstruct, Fortran::parser::OpenMPDeclarativeConstruct, Fortran::parser::OmpEndLoopDirective, Fortran::parser::CUFKernelDoConstruct&gt;::visit&lt;(anonymous namespace)::FirConverter::genFIR(Fortran::lower::pft::Evaluation&amp;, bool)::'lambda'(auto const&amp;)&gt;(auto&amp;&amp;) const::'lambda'(auto)&gt;&amp;&amp;, unsigned long, std::variant&lt;Fortran::common::Reference&lt;Fortran::parser::AllocateStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::AssignmentStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::BackspaceStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::CallStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::CloseStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ContinueStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::CycleStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::DeallocateStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndfileStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EventPostStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EventWaitStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ExitStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::FailImageStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::FlushStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::FormTeamStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::GotoStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::IfStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::InquireStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::LockStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::NotifyWaitStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::NullifyStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::OpenStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::PointerAssignmentStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::PrintStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ReadStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ReturnStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::RewindStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::StopStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::SyncAllStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::SyncImagesStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::SyncMemoryStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::SyncTeamStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::UnlockStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::WaitStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::WhereStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::WriteStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ComputedGotoStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ForallStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ArithmeticIfStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::AssignStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::AssignedGotoStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::PauseStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EntryStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::FormatStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::AssociateStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndAssociateStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::BlockStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndBlockStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::SelectCaseStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::CaseStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndSelectStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ChangeTeamStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndChangeTeamStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::CriticalStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndCriticalStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::NonLabelDoStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndDoStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::IfThenStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ElseIfStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ElseStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndIfStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::SelectRankStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::SelectRankCaseStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::SelectTypeStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::TypeGuardStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::WhereConstructStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::MaskedElsewhereStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ElsewhereStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndWhereStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::ForallConstructStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndForallStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndProgramStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndFunctionStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndSubroutineStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::EndMpSubprogramStmt const&gt;, Fortran::common::Reference&lt;Fortran::parser::AssociateConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::BlockConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::CaseConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::ChangeTeamConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::CriticalConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::DoConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::IfConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::SelectRankConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::SelectTypeConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::WhereConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::ForallConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::CompilerDirective const&gt;, Fortran::common::Reference&lt;Fortran::parser::OpenACCConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::OpenACCRoutineConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::OpenACCDeclarativeConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::OpenMPConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::OpenMPDeclarativeConstruct const&gt;, Fortran::common::Reference&lt;Fortran::parser::OmpEndLoopDirective const&gt;, Fortran::common::Reference&lt;Fortran::parser::CUFKernelDoConstruct const&gt;&gt; const&amp;) Bridge.cpp:0:0
#<!-- -->15 0x00000000046fd224 (anonymous namespace)::FirConverter::genFIR(Fortran::lower::pft::Evaluation&amp;, bool) (.constprop.0) Bridge.cpp:0:0
#<!-- -->16 0x0000000004702ebc (anonymous namespace)::FirConverter::lowerFunc(Fortran::lower::pft::FunctionLikeUnit&amp;) Bridge.cpp:0:0
#<!-- -->17 0x00000000047046d4 Fortran::lower::LoweringBridge::lower(Fortran::parser::Program const&amp;, Fortran::semantics::SemanticsContext const&amp;) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x47046d4)
#<!-- -->18 0x0000000004580dcd Fortran::frontend::CodeGenAction::beginSourceFileAction() (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x4580dcd)
#<!-- -->19 0x00000000042e0db5 Fortran::frontend::FrontendAction::beginSourceFile(Fortran::frontend::CompilerInstance&amp;, Fortran::frontend::FrontendInputFile const&amp;) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x42e0db5)
#<!-- -->20 0x00000000042ce4ef Fortran::frontend::CompilerInstance::executeAction(Fortran::frontend::FrontendAction&amp;) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x42ce4ef)
#<!-- -->21 0x00000000042ea703 Fortran::frontend::executeCompilerInvocation(Fortran::frontend::CompilerInstance*) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x42ea703)
#<!-- -->22 0x00000000025ce412 fc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*) (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x25ce412)
#<!-- -->23 0x00000000024652b1 main (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x24652b1)
#<!-- -->24 0x000074763cc29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->25 0x000074763cc29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->26 0x00000000025cce05 _start (/cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin/flang+0x25cce05)
flang-22: error: unable to execute command: Segmentation fault (core dumped)
flang-22: error: flang frontend command failed due to signal (use -v to see invocation)
flang version 22.0.0git (https://github.com/llvm/llvm-project.git 12f42e5ed9286711287e17ec35ea9bbdeb2aa92e)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /cefs/f2/f2770c831722906346657ac3_clang-llvmflang-trunk-20250929/bin

[kparzysz]

Hey Kareem, could you take a look at this?