$ coredumpctl list TIME PID UID GID SIG PRESENT EXE Wed 2015-12-02 11:46:57 CET 2567 1001 1001 11 * /usr/bin/xfdesktop Wed 2015-12-02 11:47:32 CET 3370 1001 1001 11 * /usr/bin/xfdesktop $ coredumpctl gdb 3370 PID: 3370 (xfdesktop) UID: 1001 (test) GID: 1001 (test) Signal: 11 (SEGV) Timestamp: Wed 2015-12-02 11:47:31 CET (9min ago) Command Line: xfdesktop --display :0.0 --sm-client-id 2d8011530-dc88-46e9-9f46-634f982408fa Executable: /usr/bin/xfdesktop Control Group: /user.slice/user-1001.slice/session-9.scope Unit: session-9.scope Slice: user-1001.slice Session: 9 Owner UID: 1001 (test) Boot ID: 09876543210123456789098765432123 Machine ID: 12345678909876543212345678909876 Hostname: lnx Coredump: /var/lib/systemd/coredump/core.xfdesktop.1001.09876543210123456789098765432123.3370.1449053251000000.lz4 Message: Process 3370 (xfdesktop) of user 1001 dumped core. Stack trace of thread 3370: #0 0x000055fc522185b8 xfce_backdrop_loader_size_prepared_cb (xfdesktop) #1 0x00007f59fbc3e995 g_closure_invoke (libgobject-2.0.so.0) #2 0x00007f59fbc51511 signal_emit_unlocked_R (libgobject-2.0.so.0) #3 0x00007f59fbc5a4c0 g_signal_emit_valist (libgobject-2.0.so.0) #4 0x00007f59fbc5a88f g_signal_emit (libgobject-2.0.so.0) #5 0x00007f59fcfebabe gdk_pixbuf_loader_size_func (libgdk_pixbuf-2.0.so.0) #6 0x00007f59fcff7c36 png_info_callback (libgdk_pixbuf-2.0.so.0) #7 0x00007f59f8918761 png_push_read_chunk (libpng16.so.16) #8 0x00007f59f89193cb png_process_data (libpng16.so.16) #9 0x00007f59fcff73a9 gdk_pixbuf__png_image_load_increment (libgdk_pixbuf-2.0.so.0) #10 0x00007f59fcfeb7d5 gdk_pixbuf_loader_load_module (libgdk_pixbuf-2.0.so.0) #11 0x00007f59fcfec2ba gdk_pixbuf_loader_write (libgdk_pixbuf-2.0.so.0) #12 0x000055fc5221850f xfce_backdrop_file_input_stream_ready_cb (xfdesktop) #13 0x00007f59fc35f876 async_ready_callback_wrapper (libgio-2.0.so.0) #14 0x00007f59fc388b29 g_task_return_now (libgio-2.0.so.0) #15 0x00007f59fc388b69 complete_in_idle_cb (libgio-2.0.so.0) #16 0x00007f59fb93e07a g_main_context_dispatch (libglib-2.0.so.0) #17 0x00007f59fb93e410 g_main_context_iterate.isra.29 (libglib-2.0.so.0) #18 0x00007f59fb93e732 g_main_loop_run (libglib-2.0.so.0) #19 0x00007f59fdd67f37 gtk_main (libgtk-x11-2.0.so.0) #20 0x000055fc52220a2a xfdesktop_application_start (xfdesktop) #21 0x000055fc52220daa cb_wait_for_window_manager_destroyed (xfdesktop) #22 0x00007f59fb93ab78 g_source_callback_unref (libglib-2.0.so.0) #23 0x00007f59fb93c336 g_source_destroy_internal (libglib-2.0.so.0) #24 0x00007f59fb93e110 g_main_context_dispatch (libglib-2.0.so.0) #25 0x00007f59fb93e410 g_main_context_iterate.isra.29 (libglib-2.0.so.0) #26 0x00007f59fb93e4bc g_main_context_iteration (libglib-2.0.so.0) #27 0x00007f59fc3aeecc g_application_run (libgio-2.0.so.0) #28 0x000055fc52215cdd main (xfdesktop) #29 0x00007f59fb330780 __libc_start_main (libc.so.6) #30 0x000055fc52215d19 _start (xfdesktop) Stack trace of thread 3372: #0 0x00007f59fb409a5d poll (libc.so.6) #1 0x00007f59fb93e3ac g_main_context_iterate.isra.29 (libglib-2.0.so.0) #2 0x00007f59fb93e4bc g_main_context_iteration (libglib-2.0.so.0) #3 0x00007f59fb93e4f9 glib_worker_main (libglib-2.0.so.0) #4 0x00007f59fb964cd5 g_thread_proxy (libglib-2.0.so.0) #5 0x00007f59fb6de6da start_thread (libpthread.so.0) #6 0x00007f59fb41556d __clone (libc.so.6) Stack trace of thread 3620: #0 0x00007f59fb40f779 syscall (libc.so.6) #1 0x00007f59fb982e5a g_cond_wait_until (libglib-2.0.so.0) #2 0x00007f59fb912b59 g_async_queue_pop_intern_unlocked (libglib-2.0.so.0) #3 0x00007f59fb965646 g_thread_pool_thread_proxy (libglib-2.0.so.0) #4 0x00007f59fb964cd5 g_thread_proxy (libglib-2.0.so.0) #5 0x00007f59fb6de6da start_thread (libpthread.so.0) #6 0x00007f59fb41556d __clone (libc.so.6) Stack trace of thread 3373: #0 0x00007f59fb409a5d poll (libc.so.6) #1 0x00007f59fb93e3ac g_main_context_iterate.isra.29 (libglib-2.0.so.0) #2 0x00007f59fb93e732 g_main_loop_run (libglib-2.0.so.0) #3 0x00007f59fc3e7316 gdbus_shared_thread_func (libgio-2.0.so.0) #4 0x00007f59fb964cd5 g_thread_proxy (libglib-2.0.so.0) #5 0x00007f59fb6de6da start_thread (libpthread.so.0) #6 0x00007f59fb41556d __clone (libc.so.6) Stack trace of thread 3390: #0 0x00007f59fb40f779 syscall (libc.so.6) #1 0x00007f59fb982e5a g_cond_wait_until (libglib-2.0.so.0) #2 0x00007f59fb912b59 g_async_queue_pop_intern_unlocked (libglib-2.0.so.0) #3 0x00007f59fb965646 g_thread_pool_thread_proxy (libglib-2.0.so.0) #4 0x00007f59fb964cd5 g_thread_proxy (libglib-2.0.so.0) #5 0x00007f59fb6de6da start_thread (libpthread.so.0) #6 0x00007f59fb41556d __clone (libc.so.6) GNU gdb (GDB) Fedora 7.10.50.20151113-33.fc24 Copyright (C) 2015 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-redhat-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: . Find the GDB manual and other documentation resources online at: . For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from /usr/bin/xfdesktop...Reading symbols from /usr/lib/debug/usr/bin/xfdesktop.debug...done. done. [New LWP 3370] [New LWP 3372] [New LWP 3620] [New LWP 3373] [New LWP 3390] [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". Core was generated by `xfdesktop --display :0.0 --sm-client-id 2d8011530-dc88-46e9-9f46-634f982408fa'. Program terminated with signal SIGSEGV, Segmentation fault. #0 0x000055fc522185b8 in xfce_backdrop_loader_size_prepared_cb (loader=0x55fc52964780, width=1920, height=1080, user_data=0x55fc52890d00) at xfce-backdrop.c:1691 1691 if(backdrop->priv->image_style == XFCE_BACKDROP_IMAGE_INVALID) { [Current thread is 1 (Thread 0x7f5a0015da80 (LWP 3370))] ... (gdb) backtrace full #0 0x000055fc522185b8 in xfce_backdrop_loader_size_prepared_cb (loader=0x55fc52964780, width=1920, height=1080, user_data=0x55fc52890d00) at xfce-backdrop.c:1691 image_data = 0x55fc52890d00 backdrop = 0x55fc52957930 xscale = yscale = #1 0x00007f59fbc3e995 in g_closure_invoke () at /lib64/libgobject-2.0.so.0 #2 0x00007f59fbc51511 in signal_emit_unlocked_R () at /lib64/libgobject-2.0.so.0 #3 0x00007f59fbc5a4c0 in g_signal_emit_valist () at /lib64/libgobject-2.0.so.0 #4 0x00007f59fbc5a88f in g_signal_emit () at /lib64/libgobject-2.0.so.0 #5 0x00007f59fcfebabe in gdk_pixbuf_loader_size_func () at /lib64/libgdk_pixbuf-2.0.so.0 #6 0x00007f59fcff7c36 in png_info_callback () at /lib64/libgdk_pixbuf-2.0.so.0 #7 0x00007f59f8918761 in png_push_read_chunk () at /lib64/libpng16.so.16 #8 0x00007f59f89193cb in png_process_data () at /lib64/libpng16.so.16 #9 0x00007f59fcff73a9 in gdk_pixbuf.png_image_load_increment () at /lib64/libgdk_pixbuf-2.0.so.0 #10 0x00007f59fcfeb7d5 in gdk_pixbuf_loader_load_module () at /lib64/libgdk_pixbuf-2.0.so.0 #11 0x00007f59fcfec2ba in gdk_pixbuf_loader_write () at /lib64/libgdk_pixbuf-2.0.so.0 #12 0x000055fc5221850f in xfce_backdrop_file_input_stream_ready_cb (source_object=0x55fc52866a70, res=0x55fc527dfc70, user_data=0x55fc52890d00) at xfce-backdrop.c:1974 stream = 0x55fc52866a70 image_data = 0x55fc52890d00 bytes = #13 0x00007f59fc35f876 in async_ready_callback_wrapper () at /lib64/libgio-2.0.so.0 #14 0x00007f59fc388b29 in g_task_return_now () at /lib64/libgio-2.0.so.0 #15 0x00007f59fc388b69 in complete_in_idle_cb () at /lib64/libgio-2.0.so.0 #16 0x00007f59fb93e07a in g_main_context_dispatch () at /lib64/libglib-2.0.so.0 #17 0x00007f59fb93e410 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0 #18 0x00007f59fb93e732 in g_main_loop_run () at /lib64/libglib-2.0.so.0 #19 0x00007f59fdd67f37 in gtk_main () at /lib64/libgtk-x11-2.0.so.0 #20 0x000055fc52220a2a in xfdesktop_application_start (app=0x55fc5279f950) at xfdesktop-application.c:768 gdpy = 0x55fc527c9000 error = 0x0 i = buf = "/backdrop/screen0/\000\000\000\000\000\000 \000\000\000\000\000\000\000\024S\177R\374U\000\000\001\000\b\000\000\000\000\000 \000\000\000\000\000\000\000\337Q\357\372Y\177\000\000p\312|R\374U", '\000' , "@\033m\373Y\177\000\000\020\000\000\000\000\000\000\000\001\000\b\000\000\000\000\000p\312|R\374U\000\000\240R\177R\374U\000\000\000\000\000\000\000\000\000\000\064\066\071\373Y\177\000\000p\312|R\374U\000\000\000\000\000\000\000\000\000\000 \000\000\000\000\000\000\000OX\357\372Y\177\000\000\000\000\000\000\000\000\000\000 \000\000\000\000\000\000\000hc\177R\374U\000\000\000\000\000\000"... __func__ = "xfdesktop_application_start" ---Type to continue, or q to quit--- #21 0x000055fc52220daa in cb_wait_for_window_manager_destroyed (data=0x7f59dc005360) at xfdesktop-application.c:630 wfwm = 0x7f59dc005360 #22 0x00007f59fb93ab78 in g_source_callback_unref () at /lib64/libglib-2.0.so.0 #23 0x00007f59fb93c336 in g_source_destroy_internal () at /lib64/libglib-2.0.so.0 #24 0x00007f59fb93e110 in g_main_context_dispatch () at /lib64/libglib-2.0.so.0 #25 0x00007f59fb93e410 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0 #26 0x00007f59fb93e4bc in g_main_context_iteration () at /lib64/libglib-2.0.so.0 #27 0x00007f59fc3aeecc in g_application_run () at /lib64/libgio-2.0.so.0 #28 0x000055fc52215cdd in main (argc=5, argv=0x7fffe4525c58) at main.c:86 app = 0x55fc5279f950 ret = 0 (gdb)