Memory corruption, segmentation fault, with OncePerThread, Condition, ReentrantLock on v1.12.0-rc1, nightly

[mkitti]

OnceHolder.jl with Condition and ReentrantLock (CRL)

OnceHolder.jl

Place the following in a file called OnceHolder.jl.

struct CRL
    condvar::Condition
    lock::ReentrantLock
    CRL() = new(Condition(), ReentrantLock())
end

struct OnceHolder
    once::OncePerThread{CRL}
    OnceHolder() = new(OncePerThread{CRL}(CRL))
end

holder = OnceHolder()
if length(ARGS) > 0
    display(holder)
end
holder.once()
display(holder)

Erroneous Output

When I execute this with either Julia 1.12 or nightly, I get quite random output in place of where ReentrantLock() should go.

% julia +1.12 OnceHolder.jl
OnceHolder(OncePerThread{CRL, Type{CRL}}(CRL[CRL(Condition(), Base.RefValue{Compiler.CallMeta}(Compiler.CallMeta(Core.Const(AssertionError("")), Union{}, (+c,+e,+n,+t,+s,+m,+u,+o,+r), Compiler.MethodMatchInfo(Compiler.MethodLookupResult(Any[Core.MethodMatch(Tuple{Type{AssertionError}}, svec(), AssertionError() @ Core boot.jl:451, true)], Compiler.WorldRange(0x00000000000000a2, 0xffffffffffffffff), false), Core.GlobalMethods is a Core.MethodTable with 24025 methods., Tuple{Type{AssertionError}}, true, Union{Nothing, Core.CodeInstance}[CodeInstance for MethodInstance for AssertionError()]), nothing))), #undef], UInt8[0x01, 0x00], CRL))

julia +nightly OnceHolder.jl
OnceHolder(OncePerThread{CRL, Type{CRL}}(CRL[CRL(Condition(), UInt64[0x0000000008000008, 0x000000010d148730, 0x0000000000000000, 0x0000000000000000]), #undef], UInt8[0x01, 0x00], CRL))

Expected Output

I would have expected the following output.

% julia +1.12 OnceHolder.jl
OnceHolder(OncePerThread{CRL, Type{CRL}}(CRL[CRL(Condition(), ReentrantLock()), #undef], UInt8[0x01, 0x00], CRL))

julia +nightly OnceHolder.jl
OnceHolder(OncePerThread{CRL, Type{CRL}}(CRL[CRL(Condition(), ReentrantLock()), #undef], UInt8[0x01, 0x00], CRL))

With an Argument

With the above script, if I provide an argument, the situation seems to resolve itself.

% julia +1.12 OnceHolder.jl 1 
OnceHolder(OncePerThread{CRL, Type{CRL}}(CRL[], UInt8[], CRL))
OnceHolder(OncePerThread{CRL, Type{CRL}}(CRL[CRL(Condition(), ReentrantLock()), #undef], UInt8[0x01, 0x00], CRL))

% julia +nightly OnceHolder.jl 2
OnceHolder(OncePerThread{CRL, Type{CRL}}(CRL[], UInt8[], CRL))
OnceHolder(OncePerThread{CRL, Type{CRL}}(CRL[CRL(Condition(), ReentrantLock()), #undef], UInt8[0x01, 0x00], CRL))

OnceHolderX.jl with Condition, Int, and ReentrantLock

OnceHolderX.jl

If I insert an integer into the middle of the struct, I get segmentation faults.

struct CxRL
    condvar::Condition
    x::Int
    lock::ReentrantLock
    CxRL() = new(Condition(), 5, ReentrantLock())
end

struct OnceHolder
    once::OncePerThread{CxRL}
    OnceHolder() = new(OncePerThread{CxRL}(CxRL))
end

holder = OnceHolder()
if length(ARGS) > 0
    display(holder)
end
holder.once()
display(holder)

Segmentation Fault

% julia +1.12 OnceHolderX.jl  
OnceHolder(
[68138] signal 11 (2): Segmentation fault: 11
in expression starting at /Users/kittisopikulm/OnceHolder/OnceHolderX.jl:18
gc_try_claim_and_push at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/gc-stock.c:1681 [inlined]
gc_mark_memory8 at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/gc-stock.c:1911
gc_mark_outrefs at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/gc-stock.c:2429 [inlined]
gc_mark_loop_serial_ at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/gc-stock.c:2517
gc_mark_loop_serial at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/gc-stock.c:2540
_jl_gc_collect at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/gc-stock.c:3073
ijl_gc_collect at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/gc-stock.c:3461
maybe_collect at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/gc-stock.c:349 [inlined]
jl_gc_small_alloc_inner at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/gc-stock.c:725 [inlined]
ijl_gc_small_alloc at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/gc-stock.c:774
j_const_prop_argument_heuristic_116245.1 at /Users/kittisopikulm/.julia/juliaup/julia-1.12.0-rc1+0.aarch64.apple.darwin14/lib/julia/sys.dylib (unknown line)
maybe_get_const_prop_profitable at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:1044
abstract_call_method_with_const_args at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:884
abstract_call_method_with_const_args at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:868
handle1 at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:178
infercalls at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:252
abstract_call_gf_by_type at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:338
abstract_call_known at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:2782
abstract_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:2889
abstract_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:2882 [inlined]
abstract_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3042
abstract_eval_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3060 [inlined]
abstract_eval_statement_expr at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3389
abstract_eval_basic_statement at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3778 [inlined]
abstract_eval_basic_statement at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3735 [inlined]
typeinf_local at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:4285
jfptr_typeinf_local_120992.1 at /Users/kittisopikulm/.julia/juliaup/julia-1.12.0-rc1+0.aarch64.apple.darwin14/lib/julia/sys.dylib (unknown line)
typeinf at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:4443
typeinf_ext at ./../usr/share/julia/Compiler/src/typeinfer.jl:1259
typeinf_ext_toplevel at ./../usr/share/julia/Compiler/src/typeinfer.jl:1442 [inlined]
typeinf_ext_toplevel at ./../usr/share/julia/Compiler/src/typeinfer.jl:1451
jfptr_typeinf_ext_toplevel_120716.1 at /Users/kittisopikulm/.julia/juliaup/julia-1.12.0-rc1+0.aarch64.apple.darwin14/lib/julia/sys.dylib (unknown line)
jl_apply at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/./julia.h:2374 [inlined]
jl_type_infer at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/gf.c:462
jl_compile_method_internal at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/gf.c:3302
_jl_invoke at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/gf.c:3792 [inlined]
ijl_apply_generic at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/gf.c:4000
_show_default at ./show.jl:504
show_default at ./show.jl:487 [inlined]
show at ./show.jl:482 [inlined]
show at ./multimedia.jl:47
unknown function (ip: 0x10ca1c0d3) at (unknown file)
display at ./multimedia.jl:254
display at ./multimedia.jl:255 [inlined]
display at ./multimedia.jl:340
jfptr_display_99653.1 at /Users/kittisopikulm/.julia/juliaup/julia-1.12.0-rc1+0.aarch64.apple.darwin14/lib/julia/sys.dylib (unknown line)
jl_apply at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/./julia.h:2374 [inlined]
do_call at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/interpreter.c:123
eval_stmt_value at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/interpreter.c:194
eval_body at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/interpreter.c:689
jl_interpret_toplevel_thunk at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/interpreter.c:898
jl_toplevel_eval_flex at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/toplevel.c:1035
jl_toplevel_eval_flex at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/toplevel.c:975
ijl_toplevel_eval at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/toplevel.c:1047 [inlined]
ijl_toplevel_eval_in at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/toplevel.c:1092
eval at ./boot.jl:489
include_string at ./loading.jl:2837
_include at ./loading.jl:2897
include at ./Base.jl:303
exec_options at ./client.jl:321
_start at ./client.jl:554
jfptr__start_100270.1 at /Users/kittisopikulm/.julia/juliaup/julia-1.12.0-rc1+0.aarch64.apple.darwin14/lib/julia/sys.dylib (unknown line)
jl_apply at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/./julia.h:2374 [inlined]
true_main at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/jlapi.c:971
jl_repl_entrypoint at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-release-1-dot-12/src/jlapi.c:1139
Allocations: 797131 (Pool: 797130; Big: 1); GC: 0
zsh: segmentation fault  julia +1.12 OnceHolderX.jl

% julia +nightly OnceHolderX.jl
OnceHolder(
[68148] signal 11 (2): Segmentation fault: 11
in expression starting at /Users/kittisopikulm/OnceHolder/OnceHolderX.jl:18
gc_try_claim_and_push at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/gc-stock.c:1688 [inlined]
gc_mark_memory8 at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/gc-stock.c:1918
gc_mark_outrefs at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/gc-stock.c:2436 [inlined]
gc_mark_loop_serial_ at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/gc-stock.c:2524
gc_mark_loop_serial at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/gc-stock.c:2547
_jl_gc_collect at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/gc-stock.c:3080
ijl_gc_collect at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/gc-stock.c:3489
maybe_collect at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/gc-stock.c:349 [inlined]
jl_gc_small_alloc_inner at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/gc-stock.c:725 [inlined]
ijl_gc_small_alloc at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/gc-stock.c:774
Box at ./boot.jl:499 [inlined]
already_inserted_ssa at ./../usr/share/julia/Compiler/src/ssair/passes.jl:365 [inlined]
process_node! at ./../usr/share/julia/Compiler/src/ssair/ir.jl:1464
iterate_compact at ./../usr/share/julia/Compiler/src/ssair/ir.jl:1949
iterate at ./../usr/share/julia/Compiler/src/ssair/ir.jl:1871 [inlined]
batch_inline! at ./../usr/share/julia/Compiler/src/ssair/inlining.jl:683
ssa_inlining_pass! at ./../usr/share/julia/Compiler/src/ssair/inlining.jl:79 [inlined]
run_passes_ipo_safe at ./../usr/share/julia/Compiler/src/optimize.jl:1035
run_passes_ipo_safe at ./../usr/share/julia/Compiler/src/optimize.jl:1048 [inlined]
optimize at ./../usr/share/julia/Compiler/src/optimize.jl:1021
jfptr_optimize_85030.1 at /Users/kittisopikulm/.julia/juliaup/julia-nightly/lib/julia/sys.dylib (unknown line)
finish_nocycle at ./../usr/share/julia/Compiler/src/typeinfer.jl:232
jfptr_finish_nocycle_85482.1 at /Users/kittisopikulm/.julia/juliaup/julia-nightly/lib/julia/sys.dylib (unknown line)
typeinf at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:4476
const_prop_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:1348
abstract_call_method_with_const_args at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:898
abstract_call_method_with_const_args at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:868 [inlined]
handle1 at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:178
infercalls at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:252
abstract_call_gf_by_type at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:338
abstract_call_known at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:2796
abstract_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:2903
abstract_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:2896 [inlined]
abstract_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3056
abstract_eval_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3074 [inlined]
abstract_eval_statement_expr at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3430
abstract_eval_basic_statement at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3805 [inlined]
abstract_eval_basic_statement at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3762 [inlined]
typeinf_local at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:4311
jfptr_typeinf_local_83085.1 at /Users/kittisopikulm/.julia/juliaup/julia-nightly/lib/julia/sys.dylib (unknown line)
typeinf at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:4469
const_prop_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:1348
abstract_call_method_with_const_args at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:898
abstract_call_method_with_const_args at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:868 [inlined]
handle1 at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:178
infercalls at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:252
abstract_call_gf_by_type at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:338
abstract_call_known at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:2796
abstract_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:2903
abstract_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:2896 [inlined]
abstract_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3056
abstract_eval_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3074 [inlined]
abstract_eval_statement_expr at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3430
abstract_eval_basic_statement at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3805 [inlined]
abstract_eval_basic_statement at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3762 [inlined]
typeinf_local at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:4311
jfptr_typeinf_local_83085.1 at /Users/kittisopikulm/.julia/juliaup/julia-nightly/lib/julia/sys.dylib (unknown line)
typeinf at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:4469
typeinf_ext at ./../usr/share/julia/Compiler/src/typeinfer.jl:1378
typeinf_ext_toplevel at ./../usr/share/julia/Compiler/src/typeinfer.jl:1561 [inlined]
typeinf_ext_toplevel at ./../usr/share/julia/Compiler/src/typeinfer.jl:1570
jfptr_typeinf_ext_toplevel_83677.1 at /Users/kittisopikulm/.julia/juliaup/julia-nightly/lib/julia/sys.dylib (unknown line)
jl_apply at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/./julia.h:2345 [inlined]
jl_type_infer at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/gf.c:462
jl_compile_method_internal at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/gf.c:3292
_jl_invoke at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/gf.c:3785 [inlined]
ijl_apply_generic at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/gf.c:3993
_show_default at ./show.jl:511
show_default at ./show.jl:494 [inlined]
show at ./show.jl:489 [inlined]
show at ./multimedia.jl:47
unknown function (ip: 0x110fcc0db) at (unknown file)
display at ./multimedia.jl:254
display at ./multimedia.jl:255 [inlined]
display at ./multimedia.jl:340
jfptr_display_73681.1 at /Users/kittisopikulm/.julia/juliaup/julia-nightly/lib/julia/sys.dylib (unknown line)
jl_apply at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/./julia.h:2345 [inlined]
do_call at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/interpreter.c:123
eval_stmt_value at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/interpreter.c:194
eval_body at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/interpreter.c:690
jl_interpret_toplevel_thunk at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/interpreter.c:899
jl_toplevel_eval_flex at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/toplevel.c:773
jl_toplevel_eval_flex at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/toplevel.c:713
ijl_toplevel_eval at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/toplevel.c:785 [inlined]
ijl_toplevel_eval_in at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/toplevel.c:830
eval at ./boot.jl:489
include_string at ./loading.jl:2848
_include at ./loading.jl:2908
include at ./Base.jl:309
exec_options at ./client.jl:320
_start at ./client.jl:553
jfptr__start_27320.1 at /Users/kittisopikulm/.julia/juliaup/julia-nightly/lib/julia/sys.dylib (unknown line)
jl_apply at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/./julia.h:2345 [inlined]
true_main at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/jlapi.c:971
jl_repl_entrypoint at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XC9YQX9HH2.0/build/default-honeycrisp-XC9YQX9HH2-0/julialang/julia-master/src/jlapi.c:1138
Allocations: 802804 (Pool: 802803; Big: 1); GC: 0
zsh: segmentation fault  julia +nightly OnceHolderX.jl

With an argument

However, if I add an argument to the script, then the situation resolves.

% julia +1.12 OnceHolderX.jl 1  
OnceHolder(OncePerThread{CxRL, Type{CxRL}}(CxRL[], UInt8[], CxRL))
OnceHolder(OncePerThread{CxRL, Type{CxRL}}(CxRL[CxRL(Condition(), 5, ReentrantLock()), #undef], UInt8[0x01, 0x00], CxRL))

% julia +1.12 OnceHolderX.jl 2
OnceHolder(OncePerThread{CxRL, Type{CxRL}}(CxRL[], UInt8[], CxRL))
OnceHolder(OncePerThread{CxRL, Type{CxRL}}(CxRL[CxRL(Condition(), 5, ReentrantLock()), #undef], UInt8[0x01, 0x00], CxRL))

Julia versions involved: v1.12.0-rc1 and nightly (1.13.0-DEV.861), Linux and macOS

This is issues occurs for me on Julia 1.12.0-rc1 and nightly (1.13.0-DEV.861) on both macOS and Linux.

% julia +1.12 -e "using InteractiveUtils; versioninfo()"
Julia Version 1.12.0-rc1
Commit 228edd6610b (2025-07-12 20:11 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: macOS (arm64-apple-darwin24.0.0)
  CPU: 10 × Apple M1 Max
  WORD_SIZE: 64
  LLVM: libLLVM-18.1.7 (ORCJIT, apple-m1)
  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 8 virtual cores)

% julia +nightly -e "using InteractiveUtils; versioninfo()"
Julia Version 1.13.0-DEV.861
Commit 1367b3d7ad7 (2025-07-14 00:01 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: macOS (arm64-apple-darwin24.0.0)
  CPU: 10 × Apple M1 Max
  WORD_SIZE: 64
  LLVM: libLLVM-20.1.2 (ORCJIT, apple-m1)
  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 8 virtual cores)

$ julia +1.12 -e "using InteractiveUtils; versioninfo()"
Julia Version 1.12.0-rc1
Commit 228edd6610b (2025-07-12 20:11 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 8 × AMD FX(tm)-8350 Eight-Core Processor
  WORD_SIZE: 64
  LLVM: libLLVM-18.1.7 (ORCJIT, bdver1)
  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 8 virtual cores)

$ julia +nightly -e "using InteractiveUtils; versioninfo()"
Julia Version 1.13.0-DEV.861
Commit 1367b3d7ad7 (2025-07-14 00:01 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 8 × AMD FX(tm)-8350 Eight-Core Processor
  WORD_SIZE: 64
  LLVM: libLLVM-20.1.2 (ORCJIT, bdver1)
  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 8 virtual cores)

[mkitti]

The linux segmentation faults look like this:

 $ julia +1.12 OnceHolderX.jl
OnceHolder(
[224686] signal 11 (1): Segmentation fault
in expression starting at /home/mkitti/OnceFoo/OnceHolderX.jl:18
gc_try_claim_and_push at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/gc-stock.c:1681 [inlined]
gc_mark_memory8 at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/gc-stock.c:1911
gc_mark_outrefs at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/gc-stock.c:2429 [inlined]
gc_mark_loop_serial_ at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/gc-stock.c:2517
gc_mark_loop_serial at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/gc-stock.c:2540
gc_mark_loop at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/gc-stock.c:2728 [inlined]
_jl_gc_collect at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/gc-stock.c:3073
ijl_gc_collect at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/gc-stock.c:3461
maybe_collect at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/gc-stock.c:349 [inlined]
jl_gc_small_alloc_inner at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/gc-stock.c:725 [inlined]
ijl_gc_small_alloc at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/gc-stock.c:774
Array at ./boot.jl:648 [inlined]
Array at ./boot.jl:660 [inlined]
similar at ./abstractarray.jl:867 [inlined]
similar at ./abstractarray.jl:866 [inlined]
_array_for at ./array.jl:670 [inlined]
_array_for at ./array.jl:673 [inlined]
copy_exprargs at ./expr.jl:74
copy at ./expr.jl:41
copy_exprs at ./expr.jl:66
copy_exprargs at ./expr.jl:74 [inlined]
convert_to_ircode at ./../usr/share/julia/Compiler/src/optimize.jl:1115
jfptr_convert_to_ircode_67632.1 at /home/mkitti/.julia/juliaup/julia-1.12.0-rc1+0.x64.linux.gnu/lib/julia/sys.so (unknown line)
tojlinvoke121754.1 at /home/mkitti/.julia/juliaup/julia-1.12.0-rc1+0.x64.linux.gnu/lib/julia/sys.so (unknown line)
j_convert_to_ircode_119948.1 at /home/mkitti/.julia/juliaup/julia-1.12.0-rc1+0.x64.linux.gnu/lib/julia/sys.so (unknown line)
run_passes_ipo_safe at ./../usr/share/julia/Compiler/src/optimize.jl:1013
run_passes_ipo_safe at ./../usr/share/julia/Compiler/src/optimize.jl:1027 [inlined]
optimize at ./../usr/share/julia/Compiler/src/optimize.jl:1002
jfptr_optimize_119920.1 at /home/mkitti/.julia/juliaup/julia-1.12.0-rc1+0.x64.linux.gnu/lib/julia/sys.so (unknown line)
finish_nocycle at ./../usr/share/julia/Compiler/src/typeinfer.jl:202
jfptr_finish_nocycle_119770.1 at /home/mkitti/.julia/juliaup/julia-1.12.0-rc1+0.x64.linux.gnu/lib/julia/sys.so (unknown line)
typeinf at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:4450
typeinf_ext at ./../usr/share/julia/Compiler/src/typeinfer.jl:1259
typeinf_ext_toplevel at ./../usr/share/julia/Compiler/src/typeinfer.jl:1442 [inlined]
typeinf_ext_toplevel at ./../usr/share/julia/Compiler/src/typeinfer.jl:1451
jfptr_typeinf_ext_toplevel_120061.1 at /home/mkitti/.julia/juliaup/julia-1.12.0-rc1+0.x64.linux.gnu/lib/julia/sys.so (unknown line)
jl_apply at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/julia.h:2374 [inlined]
jl_type_infer at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/gf.c:462
jl_compile_method_internal at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/gf.c:3302
_jl_invoke at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/gf.c:3792 [inlined]
ijl_apply_generic at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/gf.c:4000
_show_default at ./show.jl:504
show_default at ./show.jl:487 [inlined]
show at ./show.jl:482 [inlined]
show at ./multimedia.jl:47
unknown function (ip: 0x7b60ec300fd6) at (unknown file)
display at ./multimedia.jl:254
display at ./multimedia.jl:255 [inlined]
display at ./multimedia.jl:340
jfptr_display_64582.1 at /home/mkitti/.julia/juliaup/julia-1.12.0-rc1+0.x64.linux.gnu/lib/julia/sys.so (unknown line)
jl_apply at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/julia.h:2374 [inlined]
do_call at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/interpreter.c:123
eval_value at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/interpreter.c:243
eval_stmt_value at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/interpreter.c:194 [inlined]
eval_body at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/interpreter.c:707
jl_interpret_toplevel_thunk at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/interpreter.c:898
jl_toplevel_eval_flex at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/toplevel.c:1035
jl_toplevel_eval_flex at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/toplevel.c:975
ijl_toplevel_eval at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/toplevel.c:1047
ijl_toplevel_eval_in at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/toplevel.c:1092
eval at ./boot.jl:489
include_string at ./loading.jl:2837
_include at ./loading.jl:2897
include at ./Base.jl:303
exec_options at ./client.jl:321
_start at ./client.jl:554
jfptr__start_76350.1 at /home/mkitti/.julia/juliaup/julia-1.12.0-rc1+0.x64.linux.gnu/lib/julia/sys.so (unknown line)
jl_apply at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/julia.h:2374 [inlined]
true_main at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/jlapi.c:971
jl_repl_entrypoint at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/src/jlapi.c:1139
main at /cache/build/tester-amdci4-11/julialang/julia-release-1-dot-12/cli/loader_exe.c:58
unknown function (ip: 0x7b610622a1c9) at /lib/x86_64-linux-gnu/libc.so.6
__libc_start_main at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
unknown function (ip: 0x4010b8) at /workspace/srcdir/glibc-2.17/csu/../sysdeps/x86_64/start.S
Allocations: 801175 (Pool: 801174; Big: 1); GC: 0
Segmentation fault (core dumped)

$ julia +nightly OnceHolderX.jl
OnceHolder(
[224920] signal 11 (1): Segmentation fault
in expression starting at /home/mkitti/OnceFoo/OnceHolderX.jl:18
gc_try_claim_and_push at /cache/build/tester-amdci4-8/julialang/julia-master/src/gc-stock.c:1688 [inlined]
gc_mark_memory8 at /cache/build/tester-amdci4-8/julialang/julia-master/src/gc-stock.c:1918
gc_mark_outrefs at /cache/build/tester-amdci4-8/julialang/julia-master/src/gc-stock.c:2436 [inlined]
gc_mark_loop_serial_ at /cache/build/tester-amdci4-8/julialang/julia-master/src/gc-stock.c:2524
gc_mark_loop_serial at /cache/build/tester-amdci4-8/julialang/julia-master/src/gc-stock.c:2547
gc_mark_loop at /cache/build/tester-amdci4-8/julialang/julia-master/src/gc-stock.c:2735 [inlined]
_jl_gc_collect at /cache/build/tester-amdci4-8/julialang/julia-master/src/gc-stock.c:3080
ijl_gc_collect at /cache/build/tester-amdci4-8/julialang/julia-master/src/gc-stock.c:3489
maybe_collect at /cache/build/tester-amdci4-8/julialang/julia-master/src/gc-stock.c:349 [inlined]
jl_gc_small_alloc_inner at /cache/build/tester-amdci4-8/julialang/julia-master/src/gc-stock.c:725 [inlined]
ijl_gc_small_alloc at /cache/build/tester-amdci4-8/julialang/julia-master/src/gc-stock.c:774
Array at ./boot.jl:649 [inlined]
Array at ./boot.jl:661 [inlined]
fill at ./array.jl:548 [inlined]
fill at ./array.jl:546 [inlined]
InstructionStream at ./../usr/share/julia/Compiler/src/ssair/ir.jl:271
IncrementalCompact at ./../usr/share/julia/Compiler/src/ssair/ir.jl:774
cfg_simplify! at ./../usr/share/julia/Compiler/src/ssair/passes.jl:2562
simplify_ir! at ./../usr/share/julia/Compiler/src/optimize.jl:200 [inlined]
retrieve_ir_for_inlining at ./../usr/share/julia/Compiler/src/ssair/inlining.jl:984
jfptr_retrieve_ir_for_inlining_84183.1 at /home/mkitti/.julia/juliaup/julia-nightly/lib/julia/sys.so (unknown line)
resolve_todo at ./../usr/share/julia/Compiler/src/ssair/inlining.jl:875
#handle_const_prop_result!#201 at ./../usr/share/julia/Compiler/src/ssair/inlining.jl:1442
handle_const_prop_result! at ./../usr/share/julia/Compiler/src/ssair/inlining.jl:1435 [inlined]
#handle_any_const_result!#195 at ./../usr/share/julia/Compiler/src/ssair/inlining.jl:1318
handle_any_const_result! at ./../usr/share/julia/Compiler/src/ssair/inlining.jl:1309 [inlined]
compute_inlining_cases at ./../usr/share/julia/Compiler/src/ssair/inlining.jl:1381
handle_call! at ./../usr/share/julia/Compiler/src/ssair/inlining.jl:1413 [inlined]
assemble_inline_todo! at ./../usr/share/julia/Compiler/src/ssair/inlining.jl:1664
ssa_inlining_pass! at ./../usr/share/julia/Compiler/src/ssair/inlining.jl:76 [inlined]
run_passes_ipo_safe at ./../usr/share/julia/Compiler/src/optimize.jl:1035
run_passes_ipo_safe at ./../usr/share/julia/Compiler/src/optimize.jl:1048 [inlined]
optimize at ./../usr/share/julia/Compiler/src/optimize.jl:1021
jfptr_optimize_82096.1 at /home/mkitti/.julia/juliaup/julia-nightly/lib/julia/sys.so (unknown line)
finish_nocycle at ./../usr/share/julia/Compiler/src/typeinfer.jl:232
jfptr_finish_nocycle_84472.1 at /home/mkitti/.julia/juliaup/julia-nightly/lib/julia/sys.so (unknown line)
typeinf at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:4476
const_prop_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:1348
abstract_call_method_with_const_args at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:898
abstract_call_method_with_const_args at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:868 [inlined]
handle1 at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:178
infercalls at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:252
abstract_call_gf_by_type at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:338
abstract_call_known at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:2796
abstract_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:2903
abstract_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:2896 [inlined]
abstract_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3056
abstract_eval_call at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3074 [inlined]
abstract_eval_statement_expr at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3430
abstract_eval_basic_statement at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3805 [inlined]
abstract_eval_basic_statement at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:3762 [inlined]
typeinf_local at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:4311
jfptr_typeinf_local_83506.1 at /home/mkitti/.julia/juliaup/julia-nightly/lib/julia/sys.so (unknown line)
typeinf at ./../usr/share/julia/Compiler/src/abstractinterpretation.jl:4469
typeinf_ext at ./../usr/share/julia/Compiler/src/typeinfer.jl:1378
typeinf_ext_toplevel at ./../usr/share/julia/Compiler/src/typeinfer.jl:1561 [inlined]
typeinf_ext_toplevel at ./../usr/share/julia/Compiler/src/typeinfer.jl:1570
jfptr_typeinf_ext_toplevel_85747.1 at /home/mkitti/.julia/juliaup/julia-nightly/lib/julia/sys.so (unknown line)
jl_apply at /cache/build/tester-amdci4-8/julialang/julia-master/src/julia.h:2345 [inlined]
jl_type_infer at /cache/build/tester-amdci4-8/julialang/julia-master/src/gf.c:462
jl_compile_method_internal at /cache/build/tester-amdci4-8/julialang/julia-master/src/gf.c:3292
_jl_invoke at /cache/build/tester-amdci4-8/julialang/julia-master/src/gf.c:3785 [inlined]
ijl_apply_generic at /cache/build/tester-amdci4-8/julialang/julia-master/src/gf.c:3993
_show_default at ./show.jl:511
show_default at ./show.jl:494 [inlined]
show at ./show.jl:489 [inlined]
show at ./multimedia.jl:47
unknown function (ip: 0x7c2455f03466) at (unknown file)
display at ./multimedia.jl:254
display at ./multimedia.jl:255 [inlined]
display at ./multimedia.jl:340
jfptr_display_41776.1 at /home/mkitti/.julia/juliaup/julia-nightly/lib/julia/sys.so (unknown line)
jl_apply at /cache/build/tester-amdci4-8/julialang/julia-master/src/julia.h:2345 [inlined]
do_call at /cache/build/tester-amdci4-8/julialang/julia-master/src/interpreter.c:123
eval_value at /cache/build/tester-amdci4-8/julialang/julia-master/src/interpreter.c:243
eval_stmt_value at /cache/build/tester-amdci4-8/julialang/julia-master/src/interpreter.c:194 [inlined]
eval_body at /cache/build/tester-amdci4-8/julialang/julia-master/src/interpreter.c:694
jl_interpret_toplevel_thunk at /cache/build/tester-amdci4-8/julialang/julia-master/src/interpreter.c:899
jl_toplevel_eval_flex at /cache/build/tester-amdci4-8/julialang/julia-master/src/toplevel.c:773
jl_toplevel_eval_flex at /cache/build/tester-amdci4-8/julialang/julia-master/src/toplevel.c:713
ijl_toplevel_eval at /cache/build/tester-amdci4-8/julialang/julia-master/src/toplevel.c:785
ijl_toplevel_eval_in at /cache/build/tester-amdci4-8/julialang/julia-master/src/toplevel.c:830
eval at ./boot.jl:489
include_string at ./loading.jl:2848
_include at ./loading.jl:2908
include at ./Base.jl:309
exec_options at ./client.jl:320
_start at ./client.jl:553
jfptr__start_67796.1 at /home/mkitti/.julia/juliaup/julia-nightly/lib/julia/sys.so (unknown line)
jl_apply at /cache/build/tester-amdci4-8/julialang/julia-master/src/julia.h:2345 [inlined]
true_main at /cache/build/tester-amdci4-8/julialang/julia-master/src/jlapi.c:971
jl_repl_entrypoint at /cache/build/tester-amdci4-8/julialang/julia-master/src/jlapi.c:1138
main at /cache/build/tester-amdci4-8/julialang/julia-master/cli/loader_exe.c:58
unknown function (ip: 0x7c246f62a1c9) at /lib/x86_64-linux-gnu/libc.so.6
__libc_start_main at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
unknown function (ip: 0x4010b8) at /workspace/srcdir/glibc-2.17/csu/../sysdeps/x86_64/start.S
Allocations: 806415 (Pool: 806414; Big: 1); GC: 0
Segmentation fault (core dumped)

[mkitti]

@vtjnash I encountered this segmentation fault while trying to sort out the PythonCall stuff

[mkitti]

If I replace Base.OncePerThread with my weak home brew version of OncePerThread that I made for pre-1.12 compatibility, all is fine.

    const PerThreadLock = Base.ThreadSynchronizer()

    mutable struct OncePerThread{T,F} <: Function
        @atomic xs::Dict{Int, T} # values
        @atomic ss::Dict{Int, UInt8} # states: 0=initial, 1=hasrun, 2=error, 3==concurrent
        const initializer::F
        function OncePerThread{T,F}(initializer::F) where {T,F}
            nt = Threads.maxthreadid()
            return new{T,F}(Dict{Int,T}(), Dict{Int,UInt8}(), initializer)
        end
    end
    OncePerThread{T}(initializer::Type{U}) where {T, U} = OncePerThread{T,Type{U}}(initializer)
    (once::OncePerThread{T,F})() where {T,F} = once[Threads.threadid()]
    function Base.getindex(once::OncePerThread, tid::Integer)
        tid = Int(tid)
        ss = @atomic :acquire once.ss
        xs = @atomic :monotonic once.xs

        if haskey(ss, tid) && ss[tid] == 1
            return xs[tid]
        end

        Base.lock(PerThreadLock)
        try
            state = get(ss, tid, 0)
            if state == 0
                xs[tid] = once.initializer()
                ss[tid] = 1
            end
        finally
            Base.unlock(PerThreadLock)
        end
        return xs[tid]
    end

struct CRL
    condvar::Condition
    lock::ReentrantLock
    CRL() = new(Condition(), ReentrantLock())
end

struct OnceHolder
    once::OncePerThread{CRL}
    OnceHolder() = new(OncePerThread{CRL}(CRL))
end

holder = OnceHolder()
if length(ARGS) > 0
    display(holder)
end
holder.once()
display(holder)

$ julia +1.12 OnceHolder.jl
OnceHolder(OncePerThread{CRL, Type{CRL}}(Dict{Int64, CRL}(1 => CRL(Condition(), ReentrantLock())), Dict{Int64, UInt8}(1 => 0x01), CRL))

$ julia +nightly OnceHolder.jl
OnceHolder(OncePerThread{CRL, Type{CRL}}(Dict{Int64, CRL}(1 => CRL(Condition(), ReentrantLock())), Dict{Int64, UInt8}(1 => 0x01), CRL))

[BioTurboNick]

On Windows:

Julia Version 1.13.0-DEV.852
Commit d7bdd2184d (2025-07-11 17:59 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: 12 × Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz
  WORD_SIZE: 64
  LLVM: libLLVM-20.1.2 (ORCJIT, skylake)
  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 12 virtual cores)

OnceHolder(OncePerThread{CRL, Type{CRL}}(CRL[CRL(Condition(), Compiler.CurrentState(Compiler.Future{Compiler.RTEffects}(Base.RefValue{Compiler.RTEffects}(Compiler.RTEffects(Memory{UInt8}, Union{}, (?c,+e,+n,+t,+s,?m,+u,+o,+r), nothing)), nothing), Compiler.VarState[Compiler.VarState(Core.Const(Base.ht_keyindex), false), Compiler.VarState(Core.Const(Dict(:bold => "\e[22m", :normal => "", :default => "", :italic => "\e[23m", :reverse => "\e[27m", :nothing => "", :blink => "\e[25m", :underline => "\e[24m", :hidden => "\e[28m")), false), Compiler.VarState(Core.Const(:bold), false), Compiler.VarState(Union{}, true), Compiler.VarState(Union{}, true), Compiler.VarState(Core.Const(2), false), Compiler.VarState(Memory{Symbol}, false), Compiler.VarState(UInt8, false), Compiler.VarState(Int64, false), Compiler.VarState(Int64, false), Compiler.VarState(Int64, false), Compiler.VarState(Int64, false), Compiler.VarState(Symbol, true)], false, 50, 56)), #undef], UInt8[0x01, 0x00], CRL))

Julia Version 1.12.0-rc1
Commit 228edd6610 (2025-07-12 20:11 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: 12 × Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz
  WORD_SIZE: 64
  LLVM: libLLVM-18.1.7 (ORCJIT, skylake)
  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 12 virtual cores)

OnceHolder(OncePerThread{CRL, Type{CRL}}(CRL[CRL(Condition(), Compiler.ConstCallResult(Tuple{Int64, UInt8}, Union{}, Com128 1 ─       $(Expr(:foreigncall, :(:jl_object_id), UInt64, svec(Any), 0, :(:ccall), Core.Argument(3)))::UInt64
129 │         intrinsic Base.bitcast(Int64, %11)::Int64                                              │╻   rem
    │         intrinsic Base.sub_int(%6, 1)::Int64                                                   │╻   -
    │         intrinsic Base.and_int(%12, %13)::Int64                                                │╻   &
    │         intrinsic Base.add_int(%14, 1)::Int64                                                  │╻   +
130 │   %6  = intrinsic Base.lshr_int(%11, 0x0000000000000039)::UInt64                               │╻╷╷ _shorthash7
    │         intrinsic Base.trunc_int(UInt8, %16)::UInt8                                            ││╻   rem
    │         intrinsic Base.or_int(%17, 0x80)::UInt8                                                ││╻   |
    │   %9  =   builtin Core.tuple(%15, %18)::Tuple{Int64, UInt8}                                    │
    └──       return %9                                                                              │
    , (+c,+e,+n,+t,+s,+m,+u,+o,+r), Compiler.SpecInfo(3, false, false, nothing)), (+c,+e,+n,+t,+s,+m,+u,+o,+r), nothing)), #undef], UInt8[0x01, 0x00], CRL))

[vtjnash]

That is a very dangerous and unwise implementation of mutable struct OncePerThread to use, but clearly the builtin one is only slightly better

[mkitti]

That is a very dangerous and unwise implementation of mutable struct OncePerThread to use, but clearly the builtin one is only slightly better

Oh, yes, I know. A best effort version for Julia 1.10 compatibility would be appreciated if you have the time after the Julia 1.12 release. I'm guessing some of the newer facilities are critical to the implementation. The main reason for including that version here is to isolate the issue to the current built-in version.

[vtjnash]

Before v1.12, you need to put a lock around everything and remove atomic

[mkitti]

Before v1.12, you need to put a lock around everything and remove atomic

I am mainly concerned with Julia 1.10. Are you saying the atomic features in 1.10 are insufficient to implement OncePerThread without a lock?