BoundsError: attempt to access 1024-element Array{UInt8,1} at index [Base.OneTo(1040)]

[adamryczkowski]

To reproduce:

1. Make sure python is available in the current path
2. See the screenshot:

 $ python
Python 3.7.6 (default, Feb  2 2020, 18:45:16) 
[GCC 7.5.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 
 $ which python
/home/Adama-docs/Adam/linux/tmp/spack/opt/spack/linux-ubuntu18.04-skylake/gcc-7.5.0/python-3.7.6-s7ival66jsjhz57vm3wmooik6rkiitwm/bin/python
 $ julia
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.3.1 (2019-12-30)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

julia> import Pkg

julia> ENV["PYTHON"]="/home/Adama-docs/Adam/linux/tmp/spack/opt/spack/linux-ubuntu18.04-skylake/gcc-7.5.0/python-3.7.6-s7ival66jsjhz57vm3wmooik6rkiitwm/bin/python"
"/home/Adama-docs/Adam/linux/tmp/spack/opt/spack/linux-ubuntu18.04-skylake/gcc-7.5.0/python-3.7.6-s7ival66jsjhz57vm3wmooik6rkiitwm/bin/python"

julia> Pkg.build("PyCall")
  Building Conda ─→ `~/.julia/packages/Conda/kLXeC/deps/build.log`
  Building PyCall → `~/.julia/packages/PyCall/ttONZ/deps/build.log`
false

julia> using PyCall
[ Info: Precompiling PyCall [438e738f-606a-5dbb-bf0a-cddfbfd45ab0]
ERROR: LoadError: LoadError: BoundsError: attempt to access 1024-element Array{UInt8,1} at index [Base.OneTo(1040)]
Stacktrace:
 [1] throw_boundserror(::Array{UInt8,1}, ::Tuple{Base.OneTo{Int64}}) at ./abstractarray.jl:538
 [2] checkbounds at ./abstractarray.jl:503 [inlined]
 [3] copyto!(::Array{UInt8,1}, ::Base.ReinterpretArray{UInt8,1,Int32,Array{Int32,1}}) at ./multidimensional.jl:902
 [4] _preserveas!(::Array{UInt8,1}, ::Type{Cwstring}, ::String) at /home/adam/.julia/packages/PyCall/ttONZ/deps/depsutils.jl:68
 [5] Py_SetPythonHome(::Ptr{Nothing}, ::VersionNumber, ::String) at /home/adam/.julia/packages/PyCall/ttONZ/deps/depsutils.jl:36
 [6] top-level scope at /home/adam/.julia/packages/PyCall/ttONZ/src/startup.jl:49
 [7] include at ./boot.jl:328 [inlined]
 [8] include_relative(::Module, ::String) at ./loading.jl:1105
 [9] include at ./Base.jl:31 [inlined]
 [10] include(::String) at /home/adam/.julia/packages/PyCall/ttONZ/src/PyCall.jl:1
 [11] top-level scope at /home/adam/.julia/packages/PyCall/ttONZ/src/PyCall.jl:41
 [12] include at ./boot.jl:328 [inlined]
 [13] include_relative(::Module, ::String) at ./loading.jl:1105
 [14] include(::Module, ::String) at ./Base.jl:31
 [15] top-level scope at none:2
 [16] eval at ./boot.jl:330 [inlined]
 [17] eval(::Expr) at ./client.jl:425
 [18] top-level scope at ./none:3
in expression starting at /home/adam/.julia/packages/PyCall/ttONZ/src/startup.jl:41
in expression starting at /home/adam/.julia/packages/PyCall/ttONZ/src/PyCall.jl:41
ERROR: Failed to precompile PyCall [438e738f-606a-5dbb-bf0a-cddfbfd45ab0] to /home/adam/.julia/compiled/v1.3/PyCall/GkzkC_fBzCS.ji.
Stacktrace:
 [1] error(::String) at ./error.jl:33
 [2] compilecache(::Base.PkgId, ::String) at ./loading.jl:1283
 [3] _require(::Base.PkgId) at ./loading.jl:1024
 [4] require(::Base.PkgId) at ./loading.jl:922
 [5] require(::Module, ::Symbol) at ./loading.jl:917

julia> 

I have the same error when I try python from conda. I use Ubuntu 18.04.4.

I am also able to reproduce the same error on different machine (also Ubuntu 18.04.4)

[stevengj]

The _preserveas! here should presumaby resize the buffer as needed.

https://github.com/JuliaPy/PyCall.jl/blob/79d5141bc433bbfd2db22678a58a47a292629a2c/deps/depsutils.jl