I can reproduce this behavior in buster with amule-utils-gui
1:2.3.2-4+b1. Same on Armbian, fully updated.
(gdb) start
Function "main" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Temporary breakpoint 1 (main) pending.
Starting program: /usr/bin/amulegui
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Detaching after fork from child process 5447]
2019-02-09 21:35:40 (remote-GUI): Initialising aMuleGUI 2.3.2 compiled
with wxGTK2 v3.0.4 and Boost 1.67
2019-02-09 21:35:40 (remote-GUI): Checking if there is an instance
already running...
2019-02-09 21:35:40 (remote-GUI): No other instances are running.
[New Thread 0x7ffff24e5700 (LWP 5449)]
[New Thread 0x7ffff1ce4700 (LWP 5450)]
[New Thread 0x7ffff14e3700 (LWP 5451)]
[New Thread 0x7ffff0ce2700 (LWP 5452)]
[Detaching after fork from child process 5453]
[Detaching after fork from child process 5455]
[Detaching after fork from child process 5457]
[Detaching after fork from child process 5459]
[Detaching after fork from child process 5461]
[Detaching after fork from child process 5470]
[Detaching after fork from child process 5478]
[Detaching after fork from child process 5486]
2019-02-09 21:35:42 (remote-GUI): Asio thread 1 started
2019-02-09 21:35:42 (remote-GUI): Asio thread 2 started
2019-02-09 21:35:42 (remote-GUI): Asio thread 3 started
2019-02-09 21:35:42 (remote-GUI): Asio thread 4 started
2019-02-09 21:35:44 (remote-GUI): Connecting...
2019-02-09 21:35:44 (remote-GUI): Going to event loop...
2019-02-09 21:35:44 (remote-GUI): Remote GUI EC event handler
[Detaching after fork from child process 5502]
Thread 1 "amulegui" received signal SIGSEGV, Segmentation fault.
0x00007ffff6061db4 in ?? () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
(gdb) thread apply all bt
Thread 5 (Thread 0x7ffff0ce2700 (LWP 5452)):
#0 0x00007ffff645db2f in epoll_wait () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00005555557e1887 in ?? ()
#2 0x00005555557e5bc3 in ?? ()
#3 0x00005555557ec17c in ?? ()
#4 0x00007ffff6c3ad72 in wxThread::CallEntry() () from
/usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0
#5 0x00007ffff6c44374 in ?? () from
/usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0
#6 0x00007ffff7d81fa3 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#7 0x00007ffff645d80f in clone () from /lib/x86_64-linux-gnu/libc.so.6
Thread 4 (Thread 0x7ffff14e3700 (LWP 5451)):
#0 0x00007ffff7d87fbc in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00005555557e5d0c in ?? ()
#2 0x00005555557ec17c in ?? ()
#3 0x00007ffff6c3ad72 in wxThread::CallEntry() () from
/usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0
#4 0x00007ffff6c44374 in ?? () from
/usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0
#5 0x00007ffff7d81fa3 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#6 0x00007ffff645d80f in clone () from /lib/x86_64-linux-gnu/libc.so.6
Thread 3 (Thread 0x7ffff1ce4700 (LWP 5450)):
#0 0x00007ffff7d87fbc in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00005555557e5d0c in ?? ()
#2 0x00005555557ec17c in ?? ()
#3 0x00007ffff6c3ad72 in wxThread::CallEntry() () from
/usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0
#4 0x00007ffff6c44374 in ?? () from
/usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0
#5 0x00007ffff7d81fa3 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#6 0x00007ffff645d80f in clone () from /lib/x86_64-linux-gnu/libc.so.6
Thread 2 (Thread 0x7ffff24e5700 (LWP 5449)):
#0 0x00007ffff7d87fbc in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00005555557e5d0c in ?? ()
#2 0x00005555557ec17c in ?? ()
#3 0x00007ffff6c3ad72 in wxThread::CallEntry() () from
/usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0
#4 0x00007ffff6c44374 in ?? () from
/usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0
#5 0x00007ffff7d81fa3 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#6 0x00007ffff645d80f in clone () from /lib/x86_64-linux-gnu/libc.so.6
Thread 1 (Thread 0x7ffff2dd7a40 (LWP 5439)):
#0 0x00007ffff6061db4 in ?? () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#1 0x00007ffff60411eb in ?? () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#2 0x00007ffff5d9ec7d in g_closure_invoke () from
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#3 0x00007ffff5db1b64 in ?? () from
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#4 0x00007ffff5dba983 in g_signal_emit_valist () from
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#5 0x00007ffff5dbb90f in g_signal_emit () from
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#6 0x00007ffff6157cac in ?? () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#7 0x00007ffff603f48c in gtk_propagate_event () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#8 0x00007ffff603f87b in gtk_main_do_event () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#9 0x00007ffff5eb2bac in ?? () from
/usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#10 0x00007ffff5cbce0e in g_main_context_dispatch () from
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007ffff5cbd0a8 in ?? () from
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007ffff5cbd3a2 in g_main_loop_run () from
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007ffff603e8e7 in gtk_main () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#14 0x00007ffff7012845 in wxGUIEventLoop::DoRun() () from
/usr/lib/x86_64-linux-gnu/libwx_gtk2u_core-3.0.so.0
#15 0x00007ffff6b4248d in wxEventLoopBase::Run() () from
/usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0
#16 0x00007ffff6b0b616 in wxAppConsoleBase::MainLoop() () from
/usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0
#17 0x00007ffff6b8ccf9 in wxEntry(int&, wchar_t**) () from
/usr/lib/x86_64-linux-gnu/libwx_baseu-3.0.so.0
#18 0x00005555556cede2 in ?? ()
#19 0x00007ffff638809b in __libc_start_main () from
/lib/x86_64-linux-gnu/libc.so.6
#20 0x00005555556dfc4a in ?? ()
Unfortunately there are no debug symbol packages for the current buster
versions of libgtk2.0-0 and libwxbase3.0-0v5.
