LIbdl: Julia is unable to detect if a shared lib is loaded multiple times

[petvana]

We have found (with @slamajakub) that plotting using PyPlot caused a segmentation fault when using alongside with ImageView. It works well if ImageView isn't imported. It is tested on both v1.6.3 and master. Or should I report to ImageView or PyPlot?

using ImageView
using PyPlot
plt.figure()
println("Hello")

Tested on Ubuntu

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.3 LTS
Release:	20.04
Codename:	focal

I got the segfault just after figure(), but @slamajakub only after printing Hello.

julia> plt.figure()
XmbTextListToTextProperty result code -2
XmbTextListToTextProperty result code -2
XmbTextListToTextProperty result code -2
Figure(
signal (11): Segmentation fault
in expression starting at none:0
dict_dealloc.lto_priv.385 at /home/petr/.julia/conda/3/lib/libpython3.7m.so.1.0 (unknown line)
pydecref_ at /home/petr/.julia/packages/PyCall/BD546/src/PyCall.jl:118 [inlined]
pydecref at /home/petr/.julia/packages/PyCall/BD546/src/PyCall.jl:123
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
run_finalizer at /buildworker/worker/package_linux64/build/src/gc.c:278
jl_gc_run_finalizers_in_list at /buildworker/worker/package_linux64/build/src/gc.c:365
run_finalizers at /buildworker/worker/package_linux64/build/src/gc.c:394
jl_gc_run_pending_finalizers at /buildworker/worker/package_linux64/build/src/gc.c:404
jl_mutex_unlock at /buildworker/worker/package_linux64/build/src/locks.h:136 [inlined]
jl_generate_fptr at /buildworker/worker/package_linux64/build/src/jitlayers.cpp:361
jl_compile_method_internal at /buildworker/worker/package_linux64/build/src/gf.c:1970
jl_compile_method_internal at /buildworker/worker/package_linux64/build/src/gf.c:2236 [inlined]
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2229 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
_show_default at ./show.jl:412
show_default at ./show.jl:395 [inlined]
show at ./show.jl:390 [inlined]
show at ./multimedia.jl:47
unknown function (ip: 0x7f3f334a19d5)
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
#38 at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:220
jfptr_YY.38_51745.clone_1 at /home/petr/software/julia/julia-1.6.3/lib/julia/sys.so (unknown line)
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
with_repl_linfo at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:462
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
display at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:213
display at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:225
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
display at ./multimedia.jl:328
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
jl_f__call_latest at /buildworker/worker/package_linux64/build/src/builtins.c:714
#invokelatest#2 at ./essentials.jl:708 [inlined]
invokelatest at ./essentials.jl:706 [inlined]
print_response at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:247
#40 at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:231
jfptr_YY.40_51828.clone_1 at /home/petr/software/julia/julia-1.6.3/lib/julia/sys.so (unknown line)
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
with_repl_linfo at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:462
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
print_response at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:229
do_respond at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:798
unknown function (ip: 0x7f3f3349f704)
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
jl_f__call_latest at /buildworker/worker/package_linux64/build/src/builtins.c:714
#invokelatest#2 at ./essentials.jl:708 [inlined]
invokelatest at ./essentials.jl:706 [inlined]
run_interface at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/LineEdit.jl:2441
jfptr_run_interface_52659.clone_1 at /home/petr/software/julia/julia-1.6.3/lib/julia/sys.so (unknown line)
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
run_frontend at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:1126
#44 at ./task.jl:411
jfptr_YY.44_51688.clone_1 at /home/petr/software/julia/julia-1.6.3/lib/julia/sys.so (unknown line)
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
start_task at /buildworker/worker/package_linux64/build/src/task.c:833
Allocations: 24342945 (Pool: 24334816; Big: 8129); GC: 23
Segmentation fault (core dumped)

[petvana]

It seems the problem comes from JuliaGraphics/Gtk.jl#193 . It is not possible to load two versions of gtk. Would it be possible to throw a warning message to make it easier for the user to debug?

[KristofferC]

I think you should open an issue in one of the relevant package repos, instead of the julia language one.

[vtjnash]

#7490

[petvana]

@vtjnash This warning is exactly what we were missing. It can save (mainly beginners) much time and effort. Do you consider it worth reincarnating the PR?

[vtjnash]

It can save me time too, but I don't have time to revisit it. You are welcome to take over though and try to finish it.