reproducible segfault with describe

[ssfrr]

julia> using DataFrames

julia> classes = ["one", "two", "three"]
3-element Array{String,1}:
 "one"  
 "two"  
 "three"

julia> df = DataFrame(foo=String[], bar=Int[], baz=Int[])
0×3 DataFrame


julia> for class in classes
         df[Symbol(class)] = Bool[]
       end

julia> describe(df)
Unreachable reached at 0x7fb0b48521de

signal (4): Illegal instruction
in expression starting at no file:0
getindex at ./array.jl:729 [inlined]
get_stats at /home/sfr/.julia/packages/DataFrames/IKMvt/src/abstractdataframe/abstractdataframe.jl:448
jl_fptr_trampoline at /buildworker/worker/package_linux64/build/src/gf.c:1864
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2219
#26 at /home/sfr/.julia/packages/DataFrames/IKMvt/src/abstractdataframe/abstractdataframe.jl:412
jl_fptr_trampoline at /buildworker/worker/package_linux64/build/src/gf.c:1864
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2219
iterate at ./generator.jl:47 [inlined]
collect_to! at ./array.jl:651
collect_to_with_first! at ./array.jl:630 [inlined]
_collect at ./array.jl:624
map at ./array.jl:548 [inlined]
#describe#25 at /home/sfr/.julia/packages/DataFrames/IKMvt/src/abstractdataframe/abstractdataframe.jl:408
jl_fptr_trampoline at /buildworker/worker/package_linux64/build/src/gf.c:1864
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2219
describe at /home/sfr/.julia/packages/DataFrames/IKMvt/src/abstractdataframe/abstractdataframe.jl:381
jl_fptr_trampoline at /buildworker/worker/package_linux64/build/src/gf.c:1864
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2219
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:773
jl_interpret_toplevel_thunk_callback at /buildworker/worker/package_linux64/build/src/interpreter.c:885
unknown function (ip: 0xfffffffffffffffe)
unknown function (ip: 0x7fb0ad662adf)
unknown function (ip: 0xffffffffffffffff)
jl_interpret_toplevel_thunk at /buildworker/worker/package_linux64/build/src/interpreter.c:894
jl_toplevel_eval_flex at /buildworker/worker/package_linux64/build/src/toplevel.c:764
jl_toplevel_eval_in at /buildworker/worker/package_linux64/build/src/toplevel.c:793
eval at ./boot.jl:328
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2219
eval_user_input at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.1/REPL/src/REPL.jl:85
macro expansion at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.1/REPL/src/REPL.jl:117 [inlined]
#26 at ./task.jl:259
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2219
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1571 [inlined]
start_task at /buildworker/worker/package_linux64/build/src/task.c:572
unknown function (ip: 0xffffffffffffffff)
Allocations: 21211745 (Pool: 21208033; Big: 3712); GC: 43
[1]    28227 illegal hardware instruction (core dumped)  julia --color=yes --startup-file=no

(v1.1) pkg> st
    Status `~/.julia/environments/v1.1/Project.toml`
  [c52e3926] Atom v0.8.3
  [717857b8] DSP v0.5.2
  [a93c6f00] DataFrames v0.17.1
  [cd0f133c] Hooks v0.1.0 [`~/Dropbox/juliadev/Hooks`]
  [e5e0dc1b] Juno v0.7.0
  [f57c4921] MIDI v1.1.3
  [5fb14364] OhMyREPL v0.5.1
  [14b8a8f1] PkgTemplates v0.5.0
  [295af30f] Revise v2.0.4
  [64b0f0d9] ToyAD v0.0.0 [`../../../Dropbox/juliadev/ToyAD`]

[ssfrr]

oh, actually, much simpler MWE:

julia> using DataFrames

julia> df = DataFrame(bar=Int[])
0×1 DataFrame


julia> describe(df)
Unreachable reached at 0x7f3301dbe68e
...

[ararslan]

I can reproduce on the current release of DataFrames, but not on DataFrames master, so this should be fixed on the next tag.

[bkamins]

Yes this is fixed in #1664 and the problem is JuliaLang/julia#31133.
I think we can close this issue.

[ssfrr]

sounds good. thanks!