`minimum` might cause crash on 1.7 and master (observed on both Windows x86_64 and macOS x86_64)

[N5N3]

Found this when working on #43604. Could be fixed by some code change, but crash might means deeper bug, so I open this Issue:

julia> versioninfo()
Julia Version 1.8.0-DEV.1090
Commit d16f4806e9 (2021-12-01 10:54 UTC)
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: Intel(R) Core(TM) i5-9600KF CPU @ 3.70GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-12.0.1 (ORCJIT, skylake)

julia> a = collect(1.0:4);

julia> f(x) = x < 3 ? missing : x;

julia> minimum(f, a; dims = 1)
<unknown>:0: error: starting new .cfi frame before finishing the previous one
<unknown>:0: error: this directive must appear between .cfi_startproc and .cfi_endproc directives
<unknown>:0: error: starting new .cfi frame before finishing the previous one
<unknown>:0: error: this directive must appear between .cfi_startproc and .cfi_endproc directives

Please submit a bug report with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
Exception: EXCEPTION_ACCESS_VIOLATION at 0x0 -- unknown function (ip: 0000000000000000)
in expression starting at none:0
unknown function (ip: 0000000000000000)
Allocations: 865948 (Pool: 865603; Big: 345); GC: 1

[DilumAluthge]

I am able to reproduce this crash with Julia 1.7.1 (official binaries) on macOS x86_64. Here is the full log, which includes the contents of the LLVM module that was printed to stdout.

Click to expand:

dilum@localhost:~/Downloads$ julia
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.7.1 (2021-12-22)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

julia> versioninfo()
Julia Version 1.7.1
Commit ac5cc99908 (2021-12-22 19:35 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin19.5.0)
  CPU: Intel(R) Core(TM) i5-4278U CPU @ 2.60GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-12.0.1 (ORCJIT, haswell)
Environment:
  ASDF_JULIA_VERSION = 1.7.1
  JULIA_CUDA_VERBOSE = true
  JULIA_PKG_SERVER =

julia> a = collect(1.0:4);

julia> f(x) = x < 3 ? missing : x;

julia> minimum(f, a; dims = 1)
<unknown>:0: error: starting new .cfi frame before finishing the previous one
<unknown>:0: error: this directive must appear between .cfi_startproc and .cfi_endproc directives
<unknown>:0: error: starting new .cfi frame before finishing the previous one
<unknown>:0: error: this directive must appear between .cfi_startproc and .cfi_endproc directives
; ModuleID = 'NamedTuple'
source_filename = "NamedTuple"
target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-darwin20.6.0"

define { {} addrspace(10)* } @julia_NamedTuple_146({} addrspace(10)* nonnull readonly %0, { {} addrspace(10)* } addrspace(11)* nocapture nonnull readonly align 8 dereferenceable(8) %1) #0 !dbg !5 {
top:
  %2 = bitcast { {} addrspace(10)* } addrspace(11)* %1 to {} addrspace(10)* addrspace(11)*, !dbg !7
  %3 = load atomic {} addrspace(10)*, {} addrspace(10)* addrspace(11)* %2 unordered, align 8, !dbg !7, !tbaa !10, !nonnull !4, !dereferenceable !14, !align !15
  %4 = insertvalue { {} addrspace(10)* } zeroinitializer, {} addrspace(10)* %3, 0, !dbg !7
  ret { {} addrspace(10)* } %4, !dbg !9
}

define nonnull {} addrspace(10)* @jfptr_NamedTuple_147({} addrspace(10)* %0, {} addrspace(10)** %1, i32 %2) #1 {
top:
  %gcframe6 = alloca [3 x {} addrspace(10)*], align 16
  %gcframe6.sub7 = bitcast [3 x {} addrspace(10)*]* %gcframe6 to {} addrspace(10)**
  %3 = bitcast [3 x {} addrspace(10)*]* %gcframe6 to i8*
  call void @llvm.memset.p0i8.i32(i8* nonnull align 16 dereferenceable(24) %3, i8 0, i32 24, i1 false), !tbaa !16
  %4 = call {}*** inttoptr (i64 140733738038445 to {}*** (i64)*)(i64 261) #6
  %5 = bitcast [3 x {} addrspace(10)*]* %gcframe6 to i64*
  store i64 4, i64* %5, align 16, !tbaa !16
  %6 = load {}**, {}*** %4, align 8
  %7 = getelementptr inbounds [3 x {} addrspace(10)*], [3 x {} addrspace(10)*]* %gcframe6, i64 0, i64 1
  %8 = bitcast {} addrspace(10)** %7 to {}***
  store {}** %6, {}*** %8, align 8, !tbaa !16
  %9 = bitcast {}*** %4 to {} addrspace(10)***
  store {} addrspace(10)** %gcframe6.sub7, {} addrspace(10)*** %9, align 8
  %10 = bitcast {} addrspace(10)** %1 to { {} addrspace(10)* } addrspace(10)**
  %11 = load { {} addrspace(10)* } addrspace(10)*, { {} addrspace(10)* } addrspace(10)** %10, align 8, !nonnull !4, !dereferenceable !18, !align !18
  %12 = addrspacecast { {} addrspace(10)* } addrspace(10)* %11 to { {} addrspace(10)* } addrspace(11)*
  %13 = getelementptr inbounds [3 x {} addrspace(10)*], [3 x {} addrspace(10)*]* %gcframe6, i64 0, i64 2
  %14 = bitcast {} addrspace(10)** %13 to { {} addrspace(10)* } addrspace(10)**
  store { {} addrspace(10)* } addrspace(10)* %11, { {} addrspace(10)* } addrspace(10)** %14, align 16
  %15 = call { {} addrspace(10)* } @julia_NamedTuple_146({} addrspace(10)* readonly %0, { {} addrspace(10)* } addrspace(11)* nocapture readonly %12) #0
  %ptls_field2 = getelementptr inbounds {}**, {}*** %4, i64 2305843009213693954
  %16 = bitcast {}*** %ptls_field2 to i8**
  %ptls_load34 = load i8*, i8** %16, align 8, !tbaa !16
  %17 = extractvalue { {} addrspace(10)* } %15, 0
  store {} addrspace(10)* %17, {} addrspace(10)** %13, align 16
  %18 = call noalias nonnull {} addrspace(10)* @jl_gc_pool_alloc(i8* %ptls_load34, i32 1392, i32 16) #2
  %19 = bitcast {} addrspace(10)* %18 to i64 addrspace(10)*
  %20 = getelementptr inbounds i64, i64 addrspace(10)* %19, i64 -1
  store atomic i64 4610180208, i64 addrspace(10)* %20 unordered, align 8, !tbaa !19
  %21 = bitcast {} addrspace(10)* %18 to {} addrspace(10)* addrspace(10)*
  store {} addrspace(10)* %17, {} addrspace(10)* addrspace(10)* %21, align 8, !tbaa !22
  %22 = load {} addrspace(10)*, {} addrspace(10)** %7, align 8, !tbaa !16
  %23 = bitcast {}*** %4 to {} addrspace(10)**
  store {} addrspace(10)* %22, {} addrspace(10)** %23, align 8, !tbaa !16
  ret {} addrspace(10)* %18
}

; Function Attrs: allocsize(1)
declare noalias nonnull {} addrspace(10)* @julia.gc_alloc_obj(i8*, i64, {} addrspace(10)*) #2

; Function Attrs: argmemonly nofree nosync nounwind willreturn
declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #3

; Function Attrs: argmemonly nofree nosync nounwind willreturn
declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #3

; Function Attrs: inaccessiblemem_or_argmemonly
declare void @jl_gc_queue_root({} addrspace(10)*) #4

; Function Attrs: allocsize(1)
declare noalias nonnull {} addrspace(10)* @jl_gc_pool_alloc(i8*, i32, i32) #2

; Function Attrs: allocsize(1)
declare noalias nonnull {} addrspace(10)* @jl_gc_big_alloc(i8*, i64) #2

declare noalias nonnull {} addrspace(10)** @julia.new_gc_frame(i32)

declare void @julia.push_gc_frame({} addrspace(10)**, i32)

declare {} addrspace(10)** @julia.get_gc_frame_slot({} addrspace(10)**, i32)

declare void @julia.pop_gc_frame({} addrspace(10)**)

; Function Attrs: allocsize(1)
declare noalias nonnull {} addrspace(10)* @julia.gc_alloc_bytes(i8*, i64) #2

; Function Attrs: argmemonly nofree nosync nounwind willreturn writeonly
declare void @llvm.memset.p0i8.i32(i8* nocapture writeonly, i8, i32, i1 immarg) #5

attributes #0 = { "probe-stack"="inline-asm" }
attributes #1 = { "probe-stack"="inline-asm" "thunk" }
attributes #2 = { allocsize(1) }
attributes #3 = { argmemonly nofree nosync nounwind willreturn }
attributes #4 = { inaccessiblemem_or_argmemonly }
attributes #5 = { argmemonly nofree nosync nounwind willreturn writeonly }
attributes #6 = { nounwind readnone }

!llvm.module.flags = !{!0, !1}
!llvm.dbg.cu = !{!2}

!0 = !{i32 2, !"Dwarf Version", i32 4}
!1 = !{i32 2, !"Debug Info Version", i32 3}
!2 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !3, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, nameTableKind: GNU)
!3 = !DIFile(filename: "boot.jl", directory: ".")
!4 = !{}
!5 = distinct !DISubprogram(name: "NamedTuple", linkageName: "julia_NamedTuple_146", scope: null, file: !3, line: 601, type: !6, scopeLine: 601, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !4)
!6 = !DISubroutineType(types: !4)
!7 = !DILocation(line: 605, scope: !8, inlinedAt: !9)
!8 = distinct !DISubprogram(name: "NamedTuple;", linkageName: "NamedTuple", scope: !3, file: !3, type: !6, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !4)
!9 = !DILocation(line: 601, scope: !5)
!10 = !{!11, !11, i64 0}
!11 = !{!"jtbaa_const", !12, i64 0}
!12 = !{!"jtbaa", !13, i64 0}
!13 = !{!"jtbaa"}
!14 = !{i64 40}
!15 = !{i64 16}
!16 = !{!17, !17, i64 0}
!17 = !{!"jtbaa_gcframe", !12, i64 0}
!18 = !{i64 8}
!19 = !{!20, !20, i64 0}
!20 = !{!"jtbaa_tag", !21, i64 0}
!21 = !{!"jtbaa_data", !12, i64 0}
!22 = !{!23, !23, i64 0}
!23 = !{!"jtbaa_immut", !24, i64 0}
!24 = !{!"jtbaa_value", !21, i64 0}
LLVM ERROR: FATAL: Unable to compile LLVM Module: 'truncated or malformed object (section contents at offset 1272 with a size of 168, overlaps section contents at offset 1272 with a size of 183)
'
The module's content was printed above. Please file a bug report

signal (6): Abort trap: 6
in expression starting at none:0
__pthread_kill at /usr/lib/system/libsystem_kernel.dylib (unknown line)
Allocations: 4048490 (Pool: 4046809; Big: 1681); GC: 5
Abort trap: 6

[vtjnash]

The secondary failure here is a stackoverflow somewhere inside LLVM, which is why LLVM gets into a bad state and aborts when we try to print the source of the failure:

#0  0x00007ffff23e50b2 in llvm::SmallVectorImpl<llvm::TargetInstrInfo::RegSubRegPair>::operator=(llvm::SmallVectorImpl<llvm::TargetInstrInfo::RegSubRegPair> const&)
    () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#1  0x00007ffff23e5306 in getNewSource(llvm::MachineRegisterInfo*, llvm::TargetInstrInfo const*, llvm::TargetInstrInfo::RegSubRegPair, llvm::SmallDenseMap<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult, 4u, llvm::DenseMapInfo<llvm::TargetInstrInfo::RegSubRegPair>, llvm::detail::DenseMapPair<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult> > const&, bool) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#2  0x00007ffff23e539f in getNewSource(llvm::MachineRegisterInfo*, llvm::TargetInstrInfo const*, llvm::TargetInstrInfo::RegSubRegPair, llvm::SmallDenseMap<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult, 4u, llvm::DenseMapInfo<llvm::TargetInstrInfo::RegSubRegPair>, llvm::detail::DenseMapPair<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult> > const&, bool) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#3  0x00007ffff23e539f in getNewSource(llvm::MachineRegisterInfo*, llvm::TargetInstrInfo const*, llvm::TargetInstrInfo::RegSubRegPair, llvm::SmallDenseMap<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult, 4u, llvm::DenseMapInfo<llvm::TargetInstrInfo::RegSubRegPair>, llvm::detail::DenseMapPair<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult> > const&, bool) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#4  0x00007ffff23e539f in getNewSource(llvm::MachineRegisterInfo*, llvm::TargetInstrInfo const*, llvm::TargetInstrInfo::RegSubRegPair, llvm::SmallDenseMap<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult, 4u, llvm::DenseMapInfo<llvm::TargetInstrInfo::RegSubRegPair>, llvm::detail::DenseMapPair<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult> > const&, bool) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#5  0x00007ffff23e539f in getNewSource(llvm::MachineRegisterInfo*, llvm::TargetInstrInfo const*, llvm::TargetInstrInfo::RegSubRegPair, llvm::SmallDenseMap<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult, 4u, llvm::DenseMapInfo<llvm::TargetInstrInfo::RegSubRegPair>, llvm::detail::DenseMapPair<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult> > const&, bool) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#6  0x00007ffff23e539f in getNewSource(llvm::MachineRegisterInfo*, llvm::TargetInstrInfo const*, llvm::TargetInstrInfo::RegSubRegPair, llvm::SmallDenseMap<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult, 4u, llvm::DenseMapInfo<llvm::TargetInstrInfo::RegSubRegPair>, llvm::detail::DenseMapPair<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult> > const&, bool) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#7  0x00007ffff23e539f in getNewSource(llvm::MachineRegisterInfo*, llvm::TargetInstrInfo const*, llvm::TargetInstrInfo::RegSubRegPair, llvm::SmallDenseMap<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult, 4u, llvm::DenseMapInfo<llvm::TargetInstrInfo::RegSubRegPair>, llvm::detail::DenseMapPair<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult> > const&, bool) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#8  0x00007ffff23e539f in getNewSource(llvm::MachineRegisterInfo*, llvm::TargetInstrInfo const*, llvm::TargetInstrInfo::RegSubRegPair, llvm::SmallDenseMap<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult, 4u, llvm::DenseMapInfo<llvm::TargetInstrInfo::RegSubRegPair>, llvm::detail::DenseMapPair<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult> > const&, bool) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#9  0x00007ffff23e539f in getNewSource(llvm::MachineRegisterInfo*, llvm::TargetInstrInfo const*, llvm::TargetInstrInfo::RegSubRegPair, llvm::SmallDenseMap<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult, 4u, llvm::DenseMapInfo<llvm::TargetInstrInfo::RegSubRegPair>, llvm::detail::DenseMapPair<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult> > const&, bool) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
...
#32675 0x00007ffff23e539f in getNewSource(llvm::MachineRegisterInfo*, llvm::TargetInstrInfo const*, llvm::TargetInstrInfo::RegSubRegPair, llvm::SmallDenseMap<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult, 4u, llvm::DenseMapInfo<llvm::TargetInstrInfo::RegSubRegPair>, llvm::detail::DenseMapPair<llvm::TargetInstrInfo::RegSubRegPair, (anonymous namespace)::ValueTrackerResult> > const&, bool) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32676 0x00007ffff23e87dc in (anonymous namespace)::PeepholeOptimizer::runOnMachineFunction(llvm::MachineFunction&) [clone .part.265] ()
   from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32677 0x00007ffff22ca566 in llvm::MachineFunctionPass::runOnFunction(llvm::Function&) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
--Type <RET> for more, q to quit, c to continue without paging--
#32678 0x00007ffff1feb7c8 in llvm::FPPassManager::runOnFunction(llvm::Function&) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32679 0x00007ffff1febae9 in llvm::FPPassManager::runOnModule(llvm::Module&) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32680 0x00007ffff1fec8e0 in llvm::legacy::PassManagerImpl::run(llvm::Module&) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32681 0x00007ffff6e8b895 in JuliaOJIT::CompilerT::operator() (this=0x5555557409b0, M=...) at /data/vtjnash/julia/src/jitlayers.cpp:571
#32682 0x00007ffff3d5aecb in llvm::orc::IRCompileLayer::emit(std::unique_ptr<llvm::orc::MaterializationResponsibility, std::default_delete<llvm::orc::MaterializationResponsibility> >, llvm::orc::ThreadSafeModule) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32683 0x00007ffff3d6890c in llvm::orc::BasicIRLayerMaterializationUnit::materialize(std::unique_ptr<llvm::orc::MaterializationResponsibility, std::default_delete<llvm::orc::MaterializationResponsibility> >) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32684 0x00007ffff3d208db in llvm::orc::MaterializationTask::run() () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32685 0x00007ffff3d0234d in void llvm::detail::UniqueFunctionBase<void, std::unique_ptr<llvm::orc::Task, std::default_delete<llvm::orc::Task> > >::CallImpl<void (*)(std::unique_ptr<llvm::orc::Task, std::default_delete<llvm::orc::Task> >)>(void*, std::unique_ptr<llvm::orc::Task, std::default_delete<llvm::orc::Task> >&) ()
   from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32686 0x00007ffff3d040e2 in llvm::orc::ExecutionSession::dispatchTask(std::unique_ptr<llvm::orc::Task, std::default_delete<llvm::orc::Task> >) ()
   from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32687 0x00007ffff3d1eb1c in llvm::orc::ExecutionSession::dispatchOutstandingMUs() () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32688 0x00007ffff3d281ab in llvm::orc::ExecutionSession::OL_completeLookup(std::unique_ptr<llvm::orc::InProgressLookupState, std::default_delete<llvm::orc::InProgressLookupState> >, std::shared_ptr<llvm::orc::AsynchronousSymbolQuery>, std::function<void (llvm::DenseMap<llvm::orc::JITDylib*, llvm::DenseSet<llvm::orc::SymbolStringPtr, llvm::DenseMapInfo<llvm::orc::SymbolStringPtr> >, llvm::DenseMapInfo<llvm::orc::JITDylib*>, llvm::detail::DenseMapPair<llvm::orc::JITDylib*, llvm::DenseSet<llvm::orc::SymbolStringPtr, llvm::DenseMapInfo<llvm::orc::SymbolStringPtr> > > > const&)>) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32689 0x00007ffff3d28e4d in llvm::orc::InProgressFullLookupState::complete(std::unique_ptr<llvm::orc::InProgressLookupState, std::default_delete<llvm::orc::InProgressLookupState> >) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32690 0x00007ffff3d12283 in llvm::orc::ExecutionSession::OL_applyQueryPhase1(std::unique_ptr<llvm::orc::InProgressLookupState, std::default_delete<llvm::orc::InProgressLookupState> >, llvm::Error) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32691 0x00007ffff3d1efee in llvm::orc::ExecutionSession::lookup(llvm::orc::LookupKind, std::vector<std::pair<llvm::orc::JITDylib*, llvm::orc::JITDylibLookupFlags>, std::allocator<std::pair<llvm::orc::JITDylib*, llvm::orc::JITDylibLookupFlags> > > const&, llvm::orc::SymbolLookupSet, llvm::orc::SymbolState, llvm::unique_function<void (llvm::Expected<llvm::DenseMap<llvm::orc::SymbolStringPtr, llvm::JITEvaluatedSymbol, llvm::DenseMapInfo<llvm::orc::SymbolStringPtr>, llvm::detail::DenseMapPair<llvm::orc::SymbolStringPtr, llvm::JITEvaluatedSymbol> > >)>, std::function<void (llvm::DenseMap<llvm::orc::JITDylib*, llvm::DenseSet<llvm::orc::SymbolStringPtr, llvm::DenseMapInfo<llvm::orc::SymbolStringPtr> >, llvm::DenseMapInfo<llvm::orc::JITDylib*>, llvm::detail::DenseMapPair<llvm::orc::JITDylib*, llvm::DenseSet<llvm::orc::SymbolStringPtr, llvm::DenseMapInfo<llvm::orc::SymbolStringPtr> > > > const&)>) () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32692 0x00007ffff3d1f2b2 in llvm::orc::ExecutionSession::lookup(std::vector<std::pair<llvm::orc::JITDylib*, llvm::orc::JITDylibLookupFlags>, std::allocator<std::pair<llvm::orc::JITDylib*, llvm::orc::JITDylibLookupFlags> > > const&, llvm::orc::SymbolLookupSet const&, llvm::orc::LookupKind, llvm::orc::SymbolState, std::function<void (llvm::DenseMap<llvm::orc::JITDylib*, llvm::DenseSet<llvm::orc::SymbolStringPtr, llvm::DenseMapInfo<llvm::orc::SymbolStringPtr> >, llvm::DenseMapInfo<llvm::orc::JITDylib*>, llvm::detail::DenseMapPair<llvm::orc::JITDylib*, llvm::DenseSet<llvm::orc::SymbolStringPtr, llvm::DenseMapInfo<llvm::orc::SymbolStringPtr> > > > const&)>)
    () from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32693 0x00007ffff3d1f732 in llvm::orc::ExecutionSession::lookup(std::vector<std::pair<llvm::orc::JITDylib*, llvm::orc::JITDylibLookupFlags>, std::allocator<std::pair<llvm::orc::JITDylib*, llvm::orc::JITDylibLookupFlags> > > const&, llvm::orc::SymbolStringPtr, llvm::orc::SymbolState) ()
   from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32694 0x00007ffff3d1fa03 in llvm::orc::ExecutionSession::lookup(llvm::ArrayRef<llvm::orc::JITDylib*>, llvm::orc::SymbolStringPtr, llvm::orc::SymbolState) ()
   from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
#32695 0x00007ffff3d1fc2f in llvm::orc::ExecutionSession::lookup(llvm::ArrayRef<llvm::orc::JITDylib*>, llvm::StringRef, llvm::orc::SymbolState) ()
   from /data/vtjnash/julia/usr/bin/../lib/libLLVM-13jl.so
...

[vtjnash]

and also, fwiw, the expected result of this call (from -O0) is:

ERROR: MethodError: Union{}(::Int64) is ambiguous. Candidates:
  (::Type{T})(x::Number) where T<:AbstractChar in Base at char.jl:48
  Union{}(a...) in Core at boot.jl:261
  (::Type{T})(itr) where T<:Tuple in Base at tuple.jl:317
Possible fix, define
  Union{}(::Number)
Stacktrace:
 [1] typemax(#unused#::Type{Union{}})
   @ Dates /data/vtjnash/julia1/usr/share/julia/stdlib/v1.8/Dates/src/periods.jl:56
 [2] reducedim_init(f::Function, op::typeof(min), A::Vector{Float64}, region::Int64)
   @ Base ./reducedim.jl:159
 [3] _mapreduce_dim(f::Function, op::Function, #unused#::Base._InitialValue, A::Vector{Float64}, dims::Int64)
   @ Base ./reducedim.jl:336
 [4] #mapreduce#741
   @ ./reducedim.jl:322 [inlined]
 [5] #_minimum#783
   @ ./reducedim.jl:916 [inlined]
 [6] _minimum
   @ ./reducedim.jl:916 [inlined]
 [7] #minimum#761
   @ ./reducedim.jl:890 [inlined]
 [8] top-level scope
   @ REPL[3]:1

[vtjnash]

code_llvm(Base.mapreduce_impl, (typeof(f),typeof(min),Vector{Float64},Int64,Int64)) + repeated bugpoint --run-llc results in:

; ModuleID = 'bugpoint-reduced-simplified.bc'
source_filename = "mapreduce_impl"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

define void @julia_mapreduce_impl_48() #0 {
top:
  %0 = load double, double addrspace(13)* undef, align 8
  %1 = fcmp uge double %0, 3.000000e+00
  %2 = bitcast double %0 to i64
  %tindex_phi1 = select i1 %1, i8 2, i8 1
  %.sroa.0487.1 = select i1 %1, i64 %2, i64 undef
  switch i8 undef, label %L146 [
    i8 1, label %L381
    i8 2, label %L142
  ]

L142:                                             ; preds = %top
  %3 = icmp eq i8 %tindex_phi1, 2
  %spec.select1235 = select i1 %3, i64 %.sroa.0487.1, i64 undef
  br label %L168

L146:                                             ; preds = %top
  unreachable

L168:                                             ; preds = %L216, %L142
  %.sroa.0426.0 = phi i64 [ %spec.select1235, %L142 ], [ %7, %L216 ]
  %4 = bitcast i64 %.sroa.0426.0 to double
  br label %L216

L216:                                             ; preds = %L168
  %5 = fcmp ord double %4, 0.000000e+00
  %6 = select i1 %5, double undef, double %4
  %7 = bitcast double %6 to i64
  br label %L168

L381:                                             ; preds = %top
  ret void
}

attributes #0 = { "probe-stack"="inline-asm" }

!llvm.module.flags = !{!0}

!0 = !{i32 2, !"Debug Info Version", i32 3}

Which results in the same crash for many LLVM versions.

[mbauman]

The error on nightly is now:

julia> a = collect(1.0:4);

julia> f(x) = x < 3 ? missing : x;

julia> minimum(f, a; dims = 1)
ERROR: ArgumentError: cannot construct a value of type Union{} for return result

And — even better — this, too is fixed by #55318.