collect-related segfault

[xitology]

I'm getting segfault with the following code:

julia> versioninfo()
Julia Version 1.2.0-DEV.491
Commit 8c0b550b61 (2019-03-17 17:35 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Core(TM) i7-7600U CPU @ 2.80GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-6.0.1 (ORCJIT, skylake)

julia> abstract type Shape end

julia> struct ValueOf <: Shape; ty::Type; end

julia> struct TupleOf <: Shape; cols::Vector{Shape}; end

julia> TupleOf(cols::Union{Shape,Type}...) = TupleOf(collect(Shape, cols))
TupleOf

julia> TupleOf(ValueOf(Int), Float64)
Unreachable reached at 0x7f89b108fb6a

signal (4): Illegal instruction
in expression starting at REPL[6]:1
setindex! at ./array.jl:766
copyto! at ./abstractarray.jl:680 [inlined]
_collect at ./array.jl:505 [inlined]
collect at ./array.jl:503 [inlined]
Type at ./REPL[5]:1
jl_fptr_trampoline at /buildworker/worker/package_linux64/build/src/gf.c:1895
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2250
do_call at /buildworker/worker/package_linux64/build/src/interpreter.c:323
eval_value at /buildworker/worker/package_linux64/build/src/interpreter.c:411
eval_stmt_value at /buildworker/worker/package_linux64/build/src/interpreter.c:362 [inlined]
eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:772
jl_interpret_toplevel_thunk_callback at /buildworker/worker/package_linux64/build/src/interpreter.c:884
unknown function (ip: 0xfffffffffffffffe)
unknown function (ip: 0x7f89c137900f)
unknown function (ip: (nil))
jl_interpret_toplevel_thunk at /buildworker/worker/package_linux64/build/src/interpreter.c:893
jl_toplevel_eval_flex at /buildworker/worker/package_linux64/build/src/toplevel.c:797
jl_toplevel_eval_flex at /buildworker/worker/package_linux64/build/src/toplevel.c:746
jl_toplevel_eval_in at /buildworker/worker/package_linux64/build/src/toplevel.c:826
eval at ./boot.jl:327
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2250
eval_user_input at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.2/REPL/src/REPL.jl:86
macro expansion at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.2/REPL/src/REPL.jl:118 [inlined]
#26 at ./task.jl:261
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2250
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1594 [inlined]
start_task at /buildworker/worker/package_linux64/build/src/task.c:572
unknown function (ip: 0xffffffffffffffff)
Allocations: 6029628 (Pool: 6028094; Big: 1534); GC: 12
Illegal instruction (core dumped)

It seems to work fine with --inline=no.

[Keno]

Looks like jl_compilation_sig invalidly changes
Tuple{typeof(Base.setindex!), Array{Main.Shape, 1}, Union{Main.Shape, Type}, Int64} to
Tuple{typeof(Base.setindex!), Array{Main.Shape, 1}, Type{T} where T, Int64}

[Keno]

The problematic code path was introduced in #30458 so I'll leave this to @vtjnash

[diegozea]

Could this segfault be related? It is not related to collect (it is related to a constructor) but It also gets solved when Julia runs with --inline=no.

[JeffBezanson]

I would file an issue for that.