Undefined reference when computing Hessian with BigFloats

[andreasnoack]

The repro is

julia> f(x) = sqrt(prod(x))
f (generic function with 1 method)

julia> x = big.(ones(2));

julia> diffres = DiffResults.HessianResult(x);

julia> ForwardDiff.hessian!(diffres, f, x)
ERROR: UndefRefError: access to undefined reference
Stacktrace:
 [1] getindex at ./array.jl:729 [inlined]
 [2] seed! at /Users/andreasnoack/.julia/packages/ForwardDiff/N0wMF/src/apiutils.jl:59 [inlined]
 [3] seed!(::Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1}, ::Array{BigFloat,1}) at /Users/andreasnoack/.julia/packages/ForwardDiff/N0wMF/src/apiutils.jl:58
 [4] vector_mode_dual_eval(::ForwardDiff.InnerGradientForHess{DiffResults.MutableDiffResult{2,BigFloat,Tuple{Array{BigFloat,1},Array{BigFloat,2}}},ForwardDiff.HessianConfig{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2,Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},2},1},Tuple{Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1},Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1}}},typeof(f)}, ::Array{BigFloat,1}, ::Array{BigFloat,1}, ::ForwardDiff.JacobianConfig{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2,Tuple{Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1},Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1}}}) at /Users/andreasnoack/.julia/packages/ForwardDiff/N0wMF/src/apiutils.jl:43
 [5] vector_mode_jacobian!(::Array{BigFloat,2}, ::ForwardDiff.InnerGradientForHess{DiffResults.MutableDiffResult{2,BigFloat,Tuple{Array{BigFloat,1},Array{BigFloat,2}}},ForwardDiff.HessianConfig{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2,Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},2},1},Tuple{Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1},Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1}}},typeof(f)}, ::Array{BigFloat,1}, ::Array{BigFloat,1}, ::ForwardDiff.JacobianConfig{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2,Tuple{Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1},Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1}}}) at /Users/andreasnoack/.julia/packages/ForwardDiff/N0wMF/src/jacobian.jl:164
 [6] jacobian!(::Array{BigFloat,2}, ::ForwardDiff.InnerGradientForHess{DiffResults.MutableDiffResult{2,BigFloat,Tuple{Array{BigFloat,1},Array{BigFloat,2}}},ForwardDiff.HessianConfig{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2,Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},2},1},Tuple{Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1},Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1}}},typeof(f)}, ::Array{BigFloat,1}, ::Array{BigFloat,1}, ::ForwardDiff.JacobianConfig{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2,Tuple{Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1},Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1}}}, ::Val{false}) at /Users/andreasnoack/.julia/packages/ForwardDiff/N0wMF/src/jacobian.jl:74
 [7] hessian!(::DiffResults.MutableDiffResult{2,BigFloat,Tuple{Array{BigFloat,1},Array{BigFloat,2}}}, ::Function, ::Array{BigFloat,1}, ::ForwardDiff.HessianConfig{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2,Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},2},1},Tuple{Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1},Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1}}}, ::Val{true}) at /Users/andreasnoack/.julia/packages/ForwardDiff/N0wMF/src/hessian.jl:67
 [8] hessian!(::DiffResults.MutableDiffResult{2,BigFloat,Tuple{Array{BigFloat,1},Array{BigFloat,2}}}, ::Function, ::Array{BigFloat,1}, ::ForwardDiff.HessianConfig{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2,Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},2},1},Tuple{Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1},Array{ForwardDiff.Dual{ForwardDiff.Tag{typeof(f),BigFloat},BigFloat,2},1}}}) at /Users/andreasnoack/.julia/packages/ForwardDiff/N0wMF/src/hessian.jl:65 (repeats 2 times)
 [9] top-level scope at none:0

[chriscoey]

I just ran into this issue also