julia> r = roots(f)
Invalid instruction at 0x7f246ed51416: 0x66, 0x0f, 0x3a, 0x0f, 0xc9, 0x08, 0x48, 0x89, 0xc7, 0x48, 0xf7, 0xdf, 0x66, 0x41, 0x0f

signal (4): Illegal instruction
in expression starting at REPL[4]:1
apply_re01 at /home/andres/.julia/artifacts/91707ee1baf86e9f971d587e5379ee3956a7c5e0/lib/libfftw3.so (unknown line)
unsafe_execute! at /home/andres/.julia/packages/FFTW/kcXL6/src/fft.jl:433 [inlined]
* at /home/andres/.julia/packages/FFTW/kcXL6/src/fft.jl:827
* at /home/andres/.julia/packages/FastTransforms/MjTJy/src/chebyshevtransform.jl:89
* at /home/andres/.julia/packages/FastTransforms/MjTJy/src/chebyshevtransform.jl:107
_jl_invoke at /home/andres/julia/src/gf.c:2159 [inlined]
jl_apply_generic at /home/andres/julia/src/gf.c:2323
itransform at /home/andres/.julia/packages/ApproxFunBase/Jv4NR/src/Space.jl:434
values at /home/andres/.julia/packages/ApproxFunBase/Jv4NR/src/Fun.jl:244 [inlined]
roots at /home/andres/.julia/packages/ApproxFunOrthogonalPolynomials/5OUpO/src/roots.jl:107
_jl_invoke at /home/andres/julia/src/gf.c:2159 [inlined]
jl_apply_generic at /home/andres/julia/src/gf.c:2323
jl_apply at /home/andres/julia/src/julia.h:1700 [inlined]
do_call at /home/andres/julia/src/interpreter.c:369
eval_value at /home/andres/julia/src/interpreter.c:458
eval_stmt_value at /home/andres/julia/src/interpreter.c:409 [inlined]
eval_body at /home/andres/julia/src/interpreter.c:803
jl_interpret_toplevel_thunk at /home/andres/julia/src/interpreter.c:911
jl_toplevel_eval_flex at /home/andres/julia/src/toplevel.c:819
jl_toplevel_eval_flex at /home/andres/julia/src/toplevel.c:769
jl_toplevel_eval_in at /home/andres/julia/src/toplevel.c:848
eval at ./boot.jl:331
_jl_invoke at /home/andres/julia/src/gf.c:2145 [inlined]
jl_apply_generic at /home/andres/julia/src/gf.c:2323
eval_user_input at /home/andres/julia/usr/share/julia/stdlib/v1.4/REPL/src/REPL.jl:86
macro expansion at /home/andres/julia/usr/share/julia/stdlib/v1.4/REPL/src/REPL.jl:118 [inlined]
#26 at ./task.jl:358
_jl_invoke at /home/andres/julia/src/gf.c:2145 [inlined]
jl_apply_generic at /home/andres/julia/src/gf.c:2323
jl_apply at /home/andres/julia/src/julia.h:1700 [inlined]
start_task at /home/andres/julia/src/task.c:687
unknown function (ip: (nil))
Allocations: 157876155 (Pool: 157855301; Big: 20854); GC: 81
Illegal instruction (core dumped)