PyPlot segfault when clf() is called

[mattcbro]

Very simple code to reproduce the problem in Julia 1.0 on linux mint 19 64 bit.

using PyPlot

figure(1)
clf()

The stacktrace:
julia> include("pyplotbug.jl")

signal (11): Segmentation fault
in expression starting at /data/Projects/Maestro/pyplotbug.jl:4
function_call.lto_priv.350 at /data/usr/matthew/.julia/packages/Conda/m7vem/deps/usr/lib/libpython3.6m.so (unknown line)
PyObject_Call at /data/usr/matthew/.julia/packages/Conda/m7vem/deps/usr/lib/libpython3.6m.so (unknown line)
macro expansion at /data/usr/matthew/.julia/packages/PyCall/uX707/src/exception.jl:81 [inlined]
__pycall! at /data/usr/matthew/.julia/packages/PyCall/uX707/src/pyfncall.jl:117
_pycall! at /data/usr/matthew/.julia/packages/PyCall/uX707/src/pyfncall.jl:30
#pycall#88 at /data/usr/matthew/.julia/packages/PyCall/uX707/src/pyfncall.jl:16 [inlined]
pycall at /data/usr/matthew/.julia/packages/PyCall/uX707/src/pyfncall.jl:160 [inlined]
gcf at /data/usr/matthew/.julia/packages/PyPlot/jXCXB/src/PyPlot.jl:149
jl_fptr_trampoline at /buildworker/worker/package_linux64/build/src/gf.c:1829
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2182
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1536 [inlined]
jl_f__apply at /buildworker/worker/package_linux64/build/src/builtins.c:556
jl_f__apply_latest at /buildworker/worker/package_linux64/build/src/builtins.c:594
#invokelatest#1 at ./essentials.jl:686 [inlined]
invokelatest at ./essentials.jl:685
jl_fptr_trampoline at /buildworker/worker/package_linux64/build/src/gf.c:1829
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2182
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1536 [inlined]
jl_f__apply at /buildworker/worker/package_linux64/build/src/builtins.c:556
_pyjlwrap_call at /data/usr/matthew/.julia/packages/PyCall/uX707/src/callback.jl:28
unknown function (ip: 0x7fde3c55ce24)
jl_fptr_trampoline at /buildworker/worker/package_linux64/build/src/gf.c:1829
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2182
pyjlwrap_call at /data/usr/matthew/.julia/packages/PyCall/uX707/src/callback.jl:49
unknown function (ip: 0x7fdeb4750ae4)
_PyObject_FastCallDict at /data/usr/matthew/.julia/packages/Conda/m7vem/deps/usr/lib/libpython3.6m.so (unknown line)
call_function at /data/usr/matthew/.julia/packages/Conda/m7vem/deps/usr/lib/libpython3.6m.so (unknown line)
_PyEval_EvalFrameDefault at /data/usr/matthew/.julia/packages/Conda/m7vem/deps/usr/lib/libpython3.6m.so (unknown line)
_PyEval_EvalCodeWithName at /data/usr/matthew/.julia/packages/Conda/m7vem/deps/usr/lib/libpython3.6m.so (unknown line)
PyEval_EvalCodeEx at /data/usr/matthew/.julia/packages/Conda/m7vem/deps/usr/lib/libpython3.6m.so (unknown line)
function_call.lto_priv.350 at /data/usr/matthew/.julia/packages/Conda/m7vem/deps/usr/lib/libpython3.6m.so (unknown line)
PyObject_Call at /data/usr/matthew/.julia/packages/Conda/m7vem/deps/usr/lib/libpython3.6m.so (unknown line)
macro expansion at /data/usr/matthew/.julia/packages/PyCall/uX707/src/exception.jl:81 [inlined]
__pycall! at /data/usr/matthew/.julia/packages/PyCall/uX707/src/pyfncall.jl:117
_pycall! at /data/usr/matthew/.julia/packages/PyCall/uX707/src/pyfncall.jl:30
#pycall#88 at /data/usr/matthew/.julia/packages/PyCall/uX707/src/pyfncall.jl:16 [inlined]
pycall at /data/usr/matthew/.julia/packages/PyCall/uX707/src/pyfncall.jl:160 [inlined]
#clf#28 at /data/usr/matthew/.julia/packages/PyPlot/jXCXB/src/PyPlot.jl:172
jl_fptr_trampoline at /buildworker/worker/package_linux64/build/src/gf.c:1829
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2182
clf at /data/usr/matthew/.julia/packages/PyPlot/jXCXB/src/PyPlot.jl:169
jl_fptr_trampoline at /buildworker/worker/package_linux64/build/src/gf.c:1829
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2182
do_call at /buildworker/worker/package_linux64/build/src/interpreter.c:324
eval_value at /buildworker/worker/package_linux64/build/src/interpreter.c:428
eval_stmt_value at /buildworker/worker/package_linux64/build/src/interpreter.c:363 [inlined]
eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:686
jl_interpret_toplevel_thunk_callback at /buildworker/worker/package_linux64/build/src/interpreter.c:799
unknown function (ip: 0xfffffffffffffffe)
unknown function (ip: 0x7fde3884c32f)
unknown function (ip: 0xffffffffffffffff)
jl_interpret_toplevel_thunk at /buildworker/worker/package_linux64/build/src/interpreter.c:808
jl_toplevel_eval_flex at /buildworker/worker/package_linux64/build/src/toplevel.c:787
jl_parse_eval_all at /buildworker/worker/package_linux64/build/src/ast.c:838
jl_load at /buildworker/worker/package_linux64/build/src/toplevel.c:821
include at ./boot.jl:317 [inlined]
include_relative at ./loading.jl:1038
include at ./sysimg.jl:29
jl_fptr_trampoline at /buildworker/worker/package_linux64/build/src/gf.c:1829
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2182
include at ./client.jl:388
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2182
do_call at /buildworker/worker/package_linux64/build/src/interpreter.c:324
eval_value at /buildworker/worker/package_linux64/build/src/interpreter.c:428
eval_stmt_value at /buildworker/worker/package_linux64/build/src/interpreter.c:363 [inlined]
eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:686
jl_interpret_toplevel_thunk_callback at /buildworker/worker/package_linux64/build/src/interpreter.c:799
unknown function (ip: 0xfffffffffffffffe)
unknown function (ip: 0x7fdec0440d7f)
unknown function (ip: 0xffffffffffffffff)
jl_interpret_toplevel_thunk at /buildworker/worker/package_linux64/build/src/interpreter.c:808
jl_toplevel_eval_flex at /buildworker/worker/package_linux64/build/src/toplevel.c:787
jl_toplevel_eval_in at /buildworker/worker/package_linux64/build/src/builtins.c:622
eval at ./boot.jl:319 [inlined]
#15 at /data/usr/matthew/.julia/packages/Atom/jJn7Y/src/repl.jl:125 [inlined]
with_logstate at ./logging.jl:397
jl_fptr_trampoline at /buildworker/worker/package_linux64/build/src/gf.c:1829
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2182
with_logger at ./logging.jl:493
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2182
top-level scope at /data/usr/matthew/.julia/packages/Atom/jJn7Y/src/repl.jl:124
jl_fptr_trampoline at /buildworker/worker/package_linux64/build/src/gf.c:1829
jl_toplevel_eval_flex at /buildworker/worker/package_linux64/build/src/toplevel.c:781
jl_toplevel_eval_in at /buildworker/worker/package_linux64/build/src/builtins.c:622
eval at ./boot.jl:319
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2182
eval_user_input at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.0/REPL/src/REPL.jl:85
macro expansion at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.0/REPL/src/REPL.jl:117 [inlined]
#28 at ./task.jl:259
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2182
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1536 [inlined]
start_task at /buildworker/worker/package_linux64/build/src/task.c:268
unknown function (ip: 0xffffffffffffffff)
Allocations: 83627968 (Pool: 83604158; Big: 23810); GC: 207

[KristofferC]

Please report to the Pyplot.jl repo since this is unlikely to be a bug in julia itself.