Bound violation in SparseArrays - segfault

[KlausC]

As reported here: slack.
The code below produces a segfault.

When starting julia --check-bounds=yes the following stack trace is produced:

v"1.2.0-DEV.337"
v"1.0.3"

julia> using SparseArrays
julia> I1 = [Int8(i) for i in 1:20 for _ in 1:20];
julia> J = [Int8(i) for _ in 1:20 for i in 1:20];
julia> V = fill(1, length(I1));

julia> sparse(I1, J, V)
ERROR: BoundsError: attempt to access 400-element Array{Int8,1} at index [-128]
Stacktrace:
 [1] setindex! at ./array.jl:766 [inlined]
 [2] setindex! at ./multidimensional.jl:460 [inlined]
 [3] sparse!(::Array{Int8,1}, ::Array{Int8,1}, ::Array{Int64,1}, ::Int64, ::Int64, ::typeof(+), ::Array{Int8,1}, ::Array{Int8,1}, ::Array{Int8,1}, ::Array{Int64,1}, ::Array{Int8,1}, ::Array{Int8,1}, ::Array{Int64,1}) at /home/julia/julia/usr/share/julia/stdlib/v1.2/SparseArrays/src/sparsematrix.jl:696
 [4] sparse(::Array{Int8,1}, ::Array{Int8,1}, ::Array{Int64,1}, ::Int64, ::Int64, ::Function) at /home/julia/julia/usr/share/julia/stdlib/v1.2/SparseArrays/src/sparsematrix.jl:604
 [5] sparse at /home/julia/julia/usr/share/julia/stdlib/v1.2/SparseArrays/src/sparsematrix.jl:788 [inlined]
 [6] sparse(::Array{Int8,1}, ::Array{Int8,1}, ::Array{Int64,1}) at /home/julia/julia/usr/share/julia/stdlib/v1.2/SparseArrays/src/sparsematrix.jl:784
 [7] top-level scope at REPL[8]:1

[KlausC]

I think, the type for Ti = Int8 is not wide enough. That should be handled by sparse, though.

[KristofferC]

PR got reverted in #31667