Segfault from `NTuple{N,Base.RefValue{...}}` on Julia 1.7.1+

[MilesCranmer]

On Julia 1.7.1+, running the following valid code will cause a segfault and crash. Julia 1.7.0 is the last version which is not affected.

struct Node{D}
    children::NTuple{D,Base.RefValue{Node{D}}}
    Node(::Val{_D}) where {_D} = new{_D}()
end

Node(Val(2))

with the following traceback

[26695] signal (11.2): Segmentation fault: 11
in expression starting at /Users/mcranmer/PermaDocuments/SymbolicRegressionMonorepo/DynamicExpressions.jl/src/bug_report.jl:18
jl_compute_field_offsets at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/datatype.c:511
jl_struct_try_layout at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/datatype.c:342 [inlined]
jl_datatype_isinlinealloc at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/datatype.c:349 [inlined]
union_isinlinable at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/datatype.c:374
ijl_islayout_inline at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/datatype.c:397 [inlined]
jl_compute_field_offsets at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/datatype.c:577
inst_datatype_inner at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/jltypes.c:2193
inst_type_w_ at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/jltypes.c:2484
inst_type_w_ at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/jltypes.c:2438
inst_tuple_w_ at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/jltypes.c:2315
inst_ftypes at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/jltypes.c:2258
inst_datatype_inner at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/jltypes.c:2182
inst_type_w_ at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/jltypes.c:2484
ijl_instantiate_unionall at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/jltypes.c:1456 [inlined]
ijl_apply_type at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/jltypes.c:1388
_jl_invoke at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/gf.c:0 [inlined]
ijl_apply_generic at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/gf.c:3077
jl_apply at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/./julia.h:1982 [inlined]
do_apply at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/builtins.c:768
apply_type_tfunc at ./compiler/tfuncs.jl:1860
_jl_invoke at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/gf.c:0 [inlined]
ijl_apply_generic at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/gf.c:3077
jl_apply at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/./julia.h:1982 [inlined]
do_apply at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/builtins.c:768
builtin_tfunction at ./compiler/tfuncs.jl:2480
abstract_call_builtin at ./compiler/abstractinterpretation.jl:1739
abstract_call_known at ./compiler/abstractinterpretation.jl:2014
abstract_call at ./compiler/abstractinterpretation.jl:2169
abstract_call at ./compiler/abstractinterpretation.jl:2162
abstract_call at ./compiler/abstractinterpretation.jl:2354
abstract_eval_call at ./compiler/abstractinterpretation.jl:2370
abstract_eval_statement_expr at ./compiler/abstractinterpretation.jl:2380
abstract_eval_statement at ./compiler/abstractinterpretation.jl:2624
abstract_eval_basic_statement at ./compiler/abstractinterpretation.jl:2913
typeinf_local at ./compiler/abstractinterpretation.jl:3098
typeinf_nocycle at ./compiler/abstractinterpretation.jl:3186
_typeinf at ./compiler/typeinfer.jl:247
typeinf at ./compiler/typeinfer.jl:216
typeinf_ext at ./compiler/typeinfer.jl:1051
typeinf_ext_toplevel at ./compiler/typeinfer.jl:1082
typeinf_ext_toplevel at ./compiler/typeinfer.jl:1078
jfptr_typeinf_ext_toplevel_35854.3 at /Users/mcranmer/.julia/juliaup/julia-1.10.4+0.aarch64.apple.darwin14/lib/julia/sys.dylib (unknown line)
_jl_invoke at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/gf.c:0 [inlined]
ijl_apply_generic at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/gf.c:3077
jl_apply at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/./julia.h:1982 [inlined]
jl_type_infer at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/gf.c:394
jl_generate_fptr_impl at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/jitlayers.cpp:504
jl_compile_method_internal at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/gf.c:2481
_jl_invoke at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/gf.c:2887 [inlined]
ijl_apply_generic at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/gf.c:3077
jl_apply at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/./julia.h:1982 [inlined]
do_call at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/interpreter.c:126
eval_body at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/interpreter.c:0
jl_interpret_toplevel_thunk at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/interpreter.c:775
jl_toplevel_eval_flex at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/toplevel.c:934
jl_toplevel_eval_flex at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/toplevel.c:877
ijl_toplevel_eval at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/toplevel.c:943 [inlined]
ijl_toplevel_eval_in at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/toplevel.c:985
eval at ./boot.jl:385 [inlined]
include_string at ./loading.jl:2076
_jl_invoke at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/gf.c:0 [inlined]
ijl_apply_generic at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/gf.c:3077
_include at ./loading.jl:2136
include at ./Base.jl:495
jfptr_include_46536.3 at /Users/mcranmer/.julia/juliaup/julia-1.10.4+0.aarch64.apple.darwin14/lib/julia/sys.dylib (unknown line)
_jl_invoke at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/gf.c:0 [inlined]
ijl_apply_generic at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/gf.c:3077
exec_options at ./client.jl:318
_start at ./client.jl:552
jfptr__start_82857.3 at /Users/mcranmer/.julia/juliaup/julia-1.10.4+0.aarch64.apple.darwin14/lib/julia/sys.dylib (unknown line)
_jl_invoke at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/gf.c:0 [inlined]
ijl_apply_generic at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/gf.c:3077
jl_apply at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/./julia.h:1982 [inlined]
true_main at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/jlapi.c:582
jl_repl_entrypoint at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-10/src/jlapi.c:731
Allocations: 2908 (Pool: 2901; Big: 7); GC: 0

Other info:

julia> versioninfo()
Julia Version 1.10.4
Commit 48d4fd48430 (2024-06-04 10:41 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: macOS (arm64-apple-darwin22.4.0)
  CPU: 8 × Apple M1 Pro
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-15.0.7 (ORCJIT, apple-m1)
Threads: 6 default, 0 interactive, 3 GC (on 6 virtual cores)
Environment:
  JULIA_FORMATTER_SO = /Users/mcranmer/julia_formatter.so
  JULIA_NUM_THREADS = auto
  JULIA_OPTIMIZE = 3
  JULIA_EDITOR = code

I have reproduced this bug on the following versions, on the same machine:

• 1.12.0-DEV.772
• 1.11.0-rc1
• 1.10.4
• 1.9.4
• 1.8.4
• 1.7.3
• 1.7.2
• 1.7.1

However, the bug is not present on:

• 1.7.0
• 1.6.7

So the bug was created sometime between 1.7.0 and 1.7.1: v1.7.0...v1.7.1

[MilesCranmer]

Could be this: #43306? I don't see any other matching changes.

[nsajko]

Reproducible without the internal RefValue:

julia> struct Node{D}
           children::NTuple{D,Memory{Node{D}}}
           Node(::Val{_D}) where {_D} = new{_D}()
       end

julia> Node(Val(2))

[225608] signal 11 (1): Segmentation fault
in expression starting at REPL[2]:1
jl_compute_field_offsets at /cache/build/builder-amdci5-7/julialang/julia-master/src/datatype.c:621
jl_struct_try_layout at /cache/build/builder-amdci5-7/julialang/julia-master/src/datatype.c:352 [inlined]
jl_struct_try_layout at /cache/build/builder-amdci5-7/julialang/julia-master/src/datatype.c:345
jl_datatype_isinlinealloc at /cache/build/builder-amdci5-7/julialang/julia-master/src/datatype.c:359
union_isinlinable at /cache/build/builder-amdci5-7/julialang/julia-master/src/datatype.c:384 [inlined]
union_isinlinable at /cache/build/builder-amdci5-7/julialang/julia-master/src/datatype.c:373 [inlined]
ijl_islayout_inline at /cache/build/builder-amdci5-7/julialang/julia-master/src/datatype.c:407
jl_get_genericmemory_layout at /cache/build/builder-amdci5-7/julialang/julia-master/src/datatype.c:506
jl_compute_field_offsets at /cache/build/builder-amdci5-7/julialang/julia-master/src/datatype.c:602
inst_datatype_inner at /cache/build/builder-amdci5-7/julialang/julia-master/src/jltypes.c:2238

[MilesCranmer]

👍

On 1.10.4 here is the lldb backtrace.

lldb -- ~/.julia/bin/julia-1.10 --startup-file=no src/bug_report.jl
(lldb) target create "/Users/mcranmer/.julia/bin/julia-1.10"
Current executable set to '/Users/mcranmer/.julia/bin/julia-1.10' (arm64).
(lldb) settings set -- target.run-args  "--startup-file=no" "src/bug_report.jl"
(lldb) r
Process 43606 launched: '/Users/mcranmer/.julia/bin/julia-1.10' (arm64)
Process 43606 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
    frame #0: 0x0000000100a4ded4 libjulia-internal.1.10.4.dylib`jl_compute_field_offsets(st=0x000000010b293910) at datatype.c:511:25 [opt]
(lldb) thread backtrace
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
  * frame #0: 0x0000000100a4ded4 libjulia-internal.1.10.4.dylib`jl_compute_field_offsets(st=0x000000010b293910) at datatype.c:511:25 [opt]
    frame #1: 0x0000000100a4ed74 libjulia-internal.1.10.4.dylib`union_isinlinable [inlined] jl_struct_try_layout(dt=0x000000010b293910) at datatype.c:342:5 [opt]
    frame #2: 0x0000000100a4ed60 libjulia-internal.1.10.4.dylib`union_isinlinable [inlined] jl_datatype_isinlinealloc(ty=0x000000010b293910, pointerfree=0) at datatype.c:349:37 [opt]
    frame #3: 0x0000000100a4ed3c libjulia-internal.1.10.4.dylib`union_isinlinable(ty=0x000000010b293910, pointerfree=0, nbytes=0x000000016fdf8aa8, align=0x000000016fdf8aa0, asfield=1) at datatype.c:374:31 [opt]
    frame #4: 0x0000000100a4e2dc libjulia-internal.1.10.4.dylib`jl_compute_field_offsets [inlined] ijl_islayout_inline(eltype=0x000000010b293910, fsz=0x000000016fdf8aa8, al=0x000000016fdf8aa0) at datatype.c:397:26 [opt]
    frame #5: 0x0000000100a4e2c4 libjulia-internal.1.10.4.dylib`jl_compute_field_offsets(st=<unavailable>) at datatype.c:577:17 [opt]
    frame #6: 0x0000000100a09460 libjulia-internal.1.10.4.dylib`inst_datatype_inner(dt=0x000000010b293010, p=<unavailable>, iparams=<unavailable>, ntp=<unavailable>, stack=0x000000016fdf8b78, env=<unavailable>, check=<unavailable>, nothrow=<unavailable>) at jltypes.c:2193:13 [opt]
    frame #7: 0x0000000100a0727c libjulia-internal.1.10.4.dylib`inst_type_w_(t=0x000000010b293010, env=0x000000016fdf92a8, stack=0x000000016fdf90e8, check=1, nothrow=<unavailable>) at jltypes.c:2484:13 [opt]
    frame #8: 0x0000000100a07490 libjulia-internal.1.10.4.dylib`inst_type_w_(t=0x000000010b20edd0, env=0x000000016fdf92a8, stack=0x000000016fdf90e8, check=1, nothrow=0) at jltypes.c:2438:17 [opt]
    frame #9: 0x0000000100a0eabc libjulia-internal.1.10.4.dylib`inst_tuple_w_(t=<unavailable>, env=0x000000016fdf92a8, stack=0x000000016fdf90e8, check=1, nothrow=0) at jltypes.c:2315:26 [opt]
    frame #10: 0x0000000100a07598 libjulia-internal.1.10.4.dylib`inst_type_w_(t=<unavailable>, env=<unavailable>, stack=<unavailable>, check=<unavailable>, nothrow=<unavailable>) at jltypes.c:2465:16 [opt] [artificial]
    frame #11: 0x0000000100a09b20 libjulia-internal.1.10.4.dylib`inst_ftypes(p=<unavailable>, env=0x000000016fdf92a8, stack=0x000000016fdf90e8) at jltypes.c:2258:18 [opt]
    frame #12: 0x0000000100a093a4 libjulia-internal.1.10.4.dylib`inst_datatype_inner(dt=0x000000010b292fd0, p=<unavailable>, iparams=<unavailable>, ntp=<unavailable>, stack=0x000000016fdf90e8, env=<unavailable>, check=<unavailable>, nothrow=<unavailable>) at jltypes.c:2182:30 [opt]
    frame #13: 0x0000000100a0727c libjulia-internal.1.10.4.dylib`inst_type_w_(t=0x000000010b292fd0, env=0x000000016fdf92a8, stack=0x0000000000000000, check=1, nothrow=<unavailable>) at jltypes.c:2484:13 [opt]
    frame #14: 0x0000000100a06ae4 libjulia-internal.1.10.4.dylib`ijl_apply_type [inlined] ijl_instantiate_unionall(u=0x000000010b20ecf0, p=0x0000000100044280) at jltypes.c:1456:12 [opt]
    frame #15: 0x0000000100a06ac0 libjulia-internal.1.10.4.dylib`ijl_apply_type(tc=<unavailable>, params=0x000000016fdf9400, n=1) at jltypes.c:1388:14 [opt]
    frame #16: 0x0000000100a17d7c libjulia-internal.1.10.4.dylib`ijl_apply_generic [inlined] _jl_invoke(F=0x000000011ed8f290, args=0x000000016fdf93f8, nargs=2, mfunc=0x000000011ba8e730, world=<unavailable>) at gf.c:0 [opt]
    frame #17: 0x0000000100a17d10 libjulia-internal.1.10.4.dylib`ijl_apply_generic(F=0x000000011ed8f290, args=0x000000016fdf93f8, nargs=<unavailable>) at gf.c:3077:12 [opt]
    frame #18: 0x0000000100a25ae4 libjulia-internal.1.10.4.dylib`do_apply [inlined] jl_apply(args=<unavailable>, nargs=3) at julia.h:1982:12 [opt]
    frame #19: 0x0000000100a25ad4 libjulia-internal.1.10.4.dylib`do_apply(args=0x000000016fdf9838, nargs=<unavailable>, iterate=0x000000011b5fb2c0) at builtins.c:768:26 [opt]
    frame #20: 0x000000011a12886c sys.dylib`japi1_apply_type_tfunc_33500.4 at tfuncs.jl:1860
    frame #21: 0x0000000100a17d7c libjulia-internal.1.10.4.dylib`ijl_apply_generic [inlined] _jl_invoke(F=0x000000011b6529e0, args=0x000000016fdf9988, nargs=3, mfunc=0x000000011d9e5790, world=<unavailable>) at gf.c:0 [opt]
    frame #22: 0x0000000100a17d10 libjulia-internal.1.10.4.dylib`ijl_apply_generic(F=0x000000011b6529e0, args=0x000000016fdf9988, nargs=<unavailable>) at gf.c:3077:12 [opt]
    frame #23: 0x0000000100a25ae4 libjulia-internal.1.10.4.dylib`do_apply [inlined] jl_apply(args=<unavailable>, nargs=4) at julia.h:1982:12 [opt]
    frame #24: 0x0000000100a25ad4 libjulia-internal.1.10.4.dylib`do_apply(args=0x000000016fdf9c08, nargs=<unavailable>, iterate=0x000000011b5fb2c0) at builtins.c:768:26 [opt]
    frame #25: 0x000000011961ce38 sys.dylib`julia_builtin_tfunction_33790.4 at tfuncs.jl:2480
    frame #26: 0x000000011aa531d4 sys.dylib`julia_abstract_call_builtin_34766.4 at abstractinterpretation.jl:1739
    frame #27: 0x000000011921ed10 sys.dylib`julia_abstract_call_known_34880.4 at abstractinterpretation.jl:2014
    frame #28: 0x0000000118bf112c sys.dylib`julia_abstract_call_35061.4 at abstractinterpretation.jl:2169
    frame #29: 0x000000011abbf124 sys.dylib`julia_abstract_call_35089.4 at abstractinterpretation.jl:2162
    frame #30: 0x0000000119fbe450 sys.dylib`julia_abstract_call_35053.4 at abstractinterpretation.jl:2354
    frame #31: 0x000000011891d230 sys.dylib`julia_abstract_eval_call_35181.4 at abstractinterpretation.jl:2370
    frame #32: 0x000000011a294f44 sys.dylib`julia_abstract_eval_statement_expr_35198.4 at abstractinterpretation.jl:2380
    frame #33: 0x000000011947c060 sys.dylib`julia_abstract_eval_statement_35380.3 at abstractinterpretation.jl:2624
    frame #34: 0x000000011a12ff08 sys.dylib`julia_abstract_eval_basic_statement_35465.3 at abstractinterpretation.jl:2913
    frame #35: 0x000000011931d79c sys.dylib`julia_typeinf_local_35480.4 at abstractinterpretation.jl:3098
    frame #36: 0x0000000119e88cfc sys.dylib`julia_typeinf_nocycle_35561.4 at abstractinterpretation.jl:3186
    frame #37: 0x0000000118775218 sys.dylib`julia__typeinf_35602.4 at typeinfer.jl:247
    frame #38: 0x00000001192f0220 sys.dylib`julia_typeinf_35570.4 at typeinfer.jl:216
    frame #39: 0x000000011abb2030 sys.dylib`julia_typeinf_ext_35828.3 at typeinfer.jl:1051
    frame #40: 0x00000001194827a8 sys.dylib`julia_typeinf_ext_toplevel_35858.3 at typeinfer.jl:1082
    frame #41: 0x000000011a15f68c sys.dylib`julia_typeinf_ext_toplevel_35853.3 at typeinfer.jl:1078
    frame #42: 0x0000000118aae738 sys.dylib`jfptr_typeinf_ext_toplevel_35854.3 + 56
    frame #43: 0x0000000100a17d7c libjulia-internal.1.10.4.dylib`ijl_apply_generic [inlined] _jl_invoke(F=0x000000011f393cc0, args=0x000000016fdfbb28, nargs=2, mfunc=0x000000011da1ffe0, world=<unavailable>) at gf.c:0 [opt]
    frame #44: 0x0000000100a17d10 libjulia-internal.1.10.4.dylib`ijl_apply_generic(F=0x000000011f393cc0, args=0x000000016fdfbb28, nargs=<unavailable>) at gf.c:3077:12 [opt]
    frame #45: 0x0000000100a0fdcc libjulia-internal.1.10.4.dylib`jl_type_infer [inlined] jl_apply(args=<unavailable>, nargs=3) at julia.h:1982:12 [opt]
    frame #46: 0x0000000100a0fdc0 libjulia-internal.1.10.4.dylib`jl_type_infer(mi=0x000000010b24e2c0, world=31457, force=<unavailable>) at gf.c:394:32 [opt]
    frame #47: 0x000000010081a43c libjulia-codegen.1.10.4.dylib`jl_generate_fptr_impl(mi=0x000000010b24e2c0, world=31457, did_compile=0x000000016fdfbd9c) at jitlayers.cpp:504:19 [opt]
    frame #48: 0x0000000100a14b08 libjulia-internal.1.10.4.dylib`jl_compile_method_internal(mi=0x000000010b24e2c0, world=31457) at gf.c:2481:16 [opt]
    frame #49: 0x0000000100a17d44 libjulia-internal.1.10.4.dylib`ijl_apply_generic [inlined] _jl_invoke(F=0x000000010b20ecf0, args=0x000000016fdfbea8, nargs=1, mfunc=0x000000010b24e2c0, world=31457) at gf.c:2887:16 [opt]
    frame #50: 0x0000000100a17d10 libjulia-internal.1.10.4.dylib`ijl_apply_generic(F=0x000000010b20ecf0, args=0x000000016fdfbea8, nargs=<unavailable>) at gf.c:3077:12 [opt]
    frame #51: 0x0000000100a32484 libjulia-internal.1.10.4.dylib`do_call [inlined] jl_apply(args=<unavailable>, nargs=2) at julia.h:1982:12 [opt]
    frame #52: 0x0000000100a32474 libjulia-internal.1.10.4.dylib`do_call(args=<unavailable>, nargs=2, s=0x000000016fdfc0d0) at interpreter.c:126:26 [opt]
    frame #53: 0x0000000100a30c80 libjulia-internal.1.10.4.dylib`eval_body(stmts=0x000000010b24e1d0, s=0x000000016fdfc0d0, ip=1, toplevel=<unavailable>) at interpreter.c:0 [opt]
    frame #54: 0x0000000100a312a0 libjulia-internal.1.10.4.dylib`jl_interpret_toplevel_thunk(m=0x000000011f393cd0, src=<unavailable>) at interpreter.c:775:21 [opt]
    frame #55: 0x0000000100a497e4 libjulia-internal.1.10.4.dylib`jl_toplevel_eval_flex(m=0x000000011f393cd0, e=0x000000010b20e0d0, fast=1, expanded=<unavailable>) at toplevel.c:934:18 [opt]
    frame #56: 0x0000000100a495ac libjulia-internal.1.10.4.dylib`jl_toplevel_eval_flex(m=0x000000011f393cd0, e=0x000000010b20e210, fast=1, expanded=<unavailable>) at toplevel.c:877:19 [opt]
    frame #57: 0x0000000100a4a494 libjulia-internal.1.10.4.dylib`ijl_toplevel_eval_in [inlined] ijl_toplevel_eval(m=0x000000011f393cd0, v=0x000000010b20e210) at toplevel.c:943:12 [opt]
    frame #58: 0x0000000100a4a488 libjulia-internal.1.10.4.dylib`ijl_toplevel_eval_in(m=0x000000011f393cd0, ex=0x000000010b20e210) at toplevel.c:985:13 [opt]
    frame #59: 0x000000011a2db0e8 sys.dylib`japi1_include_string_81110.4 at boot.jl:385
    frame #60: 0x0000000100a17d7c libjulia-internal.1.10.4.dylib`ijl_apply_generic [inlined] _jl_invoke(F=0x000000011e7b8b30, args=0x000000016fdfc900, nargs=4, mfunc=0x000000011e7b98b0, world=<unavailable>) at gf.c:0 [opt]
    frame #61: 0x0000000100a17d10 libjulia-internal.1.10.4.dylib`ijl_apply_generic(F=0x000000011e7b8b30, args=0x000000016fdfc900, nargs=<unavailable>) at gf.c:3077:12 [opt]
    frame #62: 0x000000011ac9fd48 sys.dylib`japi1__include_81118.4 at loading.jl:2136
    frame #63: 0x00000001188fc09c sys.dylib`julia_include_46535.3 at Base.jl:495
    frame #64: 0x0000000119456dc0 sys.dylib`jfptr_include_46536.3 + 60
    frame #65: 0x0000000100a17d7c libjulia-internal.1.10.4.dylib`ijl_apply_generic [inlined] _jl_invoke(F=0x000000011b6d2eb0, args=0x000000016fdfe530, nargs=2, mfunc=0x000000011b6d3470, world=<unavailable>) at gf.c:0 [opt]
    frame #66: 0x0000000100a17d10 libjulia-internal.1.10.4.dylib`ijl_apply_generic(F=0x000000011b6d2eb0, args=0x000000016fdfe530, nargs=<unavailable>) at gf.c:3077:12 [opt]
    frame #67: 0x00000001183f5b34 sys.dylib`julia_exec_options_82718.4 at client.jl:318
    frame #68: 0x0000000118fa6ab4 sys.dylib`julia__start_82856.3 at client.jl:552
    frame #69: 0x0000000119b04bf4 sys.dylib`jfptr__start_82857.3 + 36
    frame #70: 0x0000000100a17d7c libjulia-internal.1.10.4.dylib`ijl_apply_generic [inlined] _jl_invoke(F=0x000000011b5a1d30, args=0x000000016fdfea58, nargs=0, mfunc=0x000000011b5a1bc0, world=<unavailable>) at gf.c:0 [opt]
    frame #71: 0x0000000100a17d10 libjulia-internal.1.10.4.dylib`ijl_apply_generic(F=0x000000011b5a1d30, args=0x000000016fdfea58, nargs=<unavailable>) at gf.c:3077:12 [opt]
    frame #72: 0x0000000100a75910 libjulia-internal.1.10.4.dylib`true_main [inlined] jl_apply(args=0x000000016fdfea50, nargs=1) at julia.h:1982:12 [opt]
    frame #73: 0x0000000100a758fc libjulia-internal.1.10.4.dylib`true_main(argc=<unavailable>, argv=<unavailable>) at jlapi.c:582:13 [opt]
    frame #74: 0x0000000100a75804 libjulia-internal.1.10.4.dylib`jl_repl_entrypoint(argc=<unavailable>, argv=<unavailable>) at jlapi.c:731:15 [opt]
    frame #75: 0x0000000100003f6c julia-1.10`main + 12
    frame #76: 0x00000001847ed0e0 dyld`start + 2360

On nightly, this line is

julia/src/datatype.c

Line 621 in ed987f2

size_t i, nfields = jl_svec_len(st->types);