Core was generated by `/usr/lib/octave/4.2.0/exec/x86_64-pc-linux-gnu/octave-gui --force-gui'. Program terminated with signal SIGABRT, Aborted. #0 0x00007f32f2a4904f in raise () from /usr/lib/libc.so.6 [Current thread is 1 (Thread 0x7f32f5eb8300 (LWP 28921))] (gdb) bt #0 0x00007f32f2a4904f in raise () from /usr/lib/libc.so.6 #1 0x00007f32f2a4a47a in abort () from /usr/lib/libc.so.6 #2 0x00007f32f52d95ff in octave::my_friendly_exit (sig_name=, sig_number=, save_vars=true) at libinterp/corefcn/sighandlers.cc:378 #3 #4 0x00007f32f51ab407 in octave_value::is_defined (this=0x7fff95746a80) at ./libinterp/octave-value/ov.h:537 #5 symbol_table::symbol_record::symbol_record_rep::is_defined (context=0, this=) at libinterp/corefcn/symtab.h:364 #6 symbol_table::symbol_record::is_defined (context=0, this=0x7f32ac23a820) at libinterp/corefcn/symtab.h:585 #7 symbol_table::do_all_variables[abi:cxx11](unsigned long, bool, unsigned int) const (exclude=8, defined_only=true, context=0, this=, this=) at libinterp/corefcn/symtab.h:2837 #8 symbol_table::all_variables[abi:cxx11](int, unsigned long, bool, unsigned int) (exclude=8, defined_only=true, context=0, scope=) at libinterp/corefcn/symtab.h:1995 #9 dump_octave_core (os=..., fname=fname@entry=0xc57ca0 "octave-workspace", fmt=..., save_as_floats=false) at libinterp/corefcn/load-save.cc:1320 #10 0x00007f32f51acd60 in dump_octave_core () at libinterp/corefcn/load-save.cc:1435 #11 0x00007f32f52d9543 in octave::my_friendly_exit (sig_name=, sig_number=6, save_vars=true) at libinterp/corefcn/sighandlers.cc:388 #12 #13 0x00007f32f2a4904f in raise () from /usr/lib/libc.so.6 #14 0x00007f32f2a4a47a in abort () from /usr/lib/libc.so.6 #15 0x00007f32f0bdde91 in qt_message_fatal (context=..., message=...) at global/qlogging.cpp:1688 #16 QMessageLogger::fatal (this=this@entry=0x7fff95747500, msg=msg@entry=0x7f32f0e7d168 "QThread: Destroyed while thread is still running") at global/qlogging.cpp:796 #17 0x00007f32f0bf1d74 in QThread::~QThread (this=0xccc540, __in_chrg=) at thread/qthread.cpp:421 #18 0x00007f32f0bf1e69 in QThread::~QThread (this=0xccc540, __in_chrg=) at thread/qthread.cpp:425 #19 0x00007f32f5975192 in octave_qt_link::~octave_qt_link (this=0x1184220, __in_chrg=) at libgui/src/octave-qt-link.cc:71 #20 0x00007f32f5975219 in octave_qt_link::~octave_qt_link (this=0x1184220, __in_chrg=) at libgui/src/octave-qt-link.cc:72 #21 0x00007f32f596a638 in main_window::~main_window (this=0x7fff95747710, __in_chrg=) at libgui/src/main-window.cc:165 #22 0x00007f32f597481a in octave::gui_application::execute (this=this@entry=0x7fff95747ad0) at libgui/src/octave-gui.cc:228 #23 0x00000000004010d5 in main (argc=2, argv=0x7fff95747d68) at src/main-gui.cc:104