(gdb) run /usr/bin/firmapiu-gui 
Starting program: /usr/bin/python3 /usr/bin/firmapiu-gui
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
[New Thread 0xb3091b40 (LWP 9560)]
[New Thread 0xaf354b40 (LWP 9562)]
[New Thread 0xaeb53b40 (LWP 9563)]

Program received signal SIGSEGV, Segmentation fault.
0xb7402553 in QSocketNotifier::setEnabled(bool) () from /usr/lib/i386-linux-gnu/libQt5Core.so.5
(gdb) bt
#0  0xb7402553 in QSocketNotifier::setEnabled(bool) () from /usr/lib/i386-linux-gnu/libQt5Core.so.5
#1  0xb740259f in QSocketNotifier::~QSocketNotifier() () from /usr/lib/i386-linux-gnu/libQt5Core.so.5
#2  0xb74025cc in QSocketNotifier::~QSocketNotifier() () from /usr/lib/i386-linux-gnu/libQt5Core.so.5
#3  0xb5445c07 in ?? () from /usr/lib/i386-linux-gnu/libQt5DBus.so.5
#4  0xb54068a8 in ?? () from /lib/i386-linux-gnu/libdbus-1.so.3
#5  0xb53ea59a in ?? () from /lib/i386-linux-gnu/libdbus-1.so.3
#6  0xb5404ccc in ?? () from /lib/i386-linux-gnu/libdbus-1.so.3
#7  0xb5404d4b in ?? () from /lib/i386-linux-gnu/libdbus-1.so.3
#8  0xb5403ec7 in ?? () from /lib/i386-linux-gnu/libdbus-1.so.3
#9  0xb53ed655 in ?? () from /lib/i386-linux-gnu/libdbus-1.so.3
#10 0xb544842e in ?? () from /usr/lib/i386-linux-gnu/libQt5DBus.so.5
#11 0xb543a9d9 in ?? () from /usr/lib/i386-linux-gnu/libQt5DBus.so.5
#12 0xb543aa6b in ?? () from /usr/lib/i386-linux-gnu/libQt5DBus.so.5
#13 0xb7e2f1b1 in __run_exit_handlers (status=status@entry=0, listp=0xb7fa63c4 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true) at exit.c:82
#14 0xb7e2f20d in __GI_exit (status=0) at exit.c:104
#15 0xb7e15a8b in __libc_start_main (main=0x8062870 <main>, argc=2, argv=0xbffff1c4, init=0x8239a50 <__libc_csu_init>, fini=0x8239ac0 <__libc_csu_fini>, rtld_fini=0xb7fed180 <_dl_fini>, stack_end=0xbffff1bc) at libc-start.c:321
#16 0x08062a7d in _start ()