May 21 10:07:26 muradm-aln2 systemd-coredump[2923]: Process 2834 (lightdm-gtk-gre) of user 620 dumped core. Stack trace of thread 2834: #0 0x00007f963afa8c60 cairo_surface_get_type (libcairo.so.2) #1 0x000056483440d8ff greeter_background_save_xroot (lightdm-gtk-greeter) #2 0x0000564834407624 n/a (lightdm-gtk-greeter) #3 0x00007f963ad12465 g_signal_emit_valist (libgobject-2.0.so.0) #4 0x00007f963ad13140 g_signal_emit (libgobject-2.0.so.0) #5 0x00007f963abb0a1c n/a (liblightdm-gobject-1.so.0) #6 0x00007f963abb0bb0 n/a (liblightdm-gobject-1.so.0) #7 0x00007f963ac317b1 g_main_context_dispatch (libglib-2.0.so.0) #8 0x00007f963ac33869 n/a (libglib-2.0.so.0) #9 0x00007f963ac347f2 g_main_loop_run (libglib-2.0.so.0) #10 0x00007f963b38f9bf gtk_main (libgtk-3.so.0) #11 0x000056483440572d main (lightdm-gtk-greeter) #12 0x00007f963a543ce3 __libc_start_main (libc.so.6) #13 0x00005648344067de _start (lightdm-gtk-greeter) Stack trace of thread 2835: #0 0x00007f963a6100d1 __poll (libc.so.6) #1 0x00007f963ac337c0 n/a (libglib-2.0.so.0) #2 0x00007f963ac338ae g_main_context_iteration (libglib-2.0.so.0) #3 0x00007f963ac33902 n/a (libglib-2.0.so.0) #4 0x00007f963ac0ef21 n/a (libglib-2.0.so.0) #5 0x00007f963a6eea92 start_thread (libpthread.so.0) #6 0x00007f963a61acd3 __clone (libc.so.6) Stack trace of thread 2836: #0 0x00007f963a6f4bac pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0) #1 0x00007f96357f22e4 n/a (i965_dri.so) #2 0x00007f96357f2008 n/a (i965_dri.so) #3 0x00007f963a6eea92 start_thread (libpthread.so.0) #4 0x00007f963a61acd3 __clone (libc.so.6) Stack trace of thread 2854: #0 0x00007f963a6100d1 __poll (libc.so.6) #1 0x00007f963ac337c0 n/a (libglib-2.0.so.0) #2 0x00007f963ac347f2 g_main_loop_run (libglib-2.0.so.0) #3 0x00007f963ada7648 n/a (libgio-2.0.so.0) #4 0x00007f963ac0ef21 n/a (libglib-2.0.so.0) #5 0x00007f963a6eea92 start_thread (libpthread.so.0) #6 0x00007f963a61acd3 __clone (libc.so.6)