$ 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 2567 PID: 2567 (xfdesktop) UID: 1001 (test) GID: 1001 (test) Signal: 11 (SEGV) Timestamp: Wed 2015-12-02 11:46:57 CET (14min 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-8.scope Unit: session-8.scope Slice: user-1001.slice Session: 8 Owner UID: 1001 (test) Boot ID: 09876543210123456789098765432123 Machine ID: 12345678909876543212345678909876 Hostname: lnx Coredump: /var/lib/systemd/coredump/core.xfdesktop.1001.09876543210123456789098765432123.2567.1449053217000000.lz4 Message: Process 2567 (xfdesktop) of user 1001 dumped core. Stack trace of thread 2567: #0 0x000056009fce55b8 xfce_backdrop_loader_size_prepared_cb (xfdesktop) #1 0x00007fadc682c995 g_closure_invoke (libgobject-2.0.so.0) #2 0x00007fadc683f511 signal_emit_unlocked_R (libgobject-2.0.so.0) #3 0x00007fadc68484c0 g_signal_emit_valist (libgobject-2.0.so.0) #4 0x00007fadc684888f g_signal_emit (libgobject-2.0.so.0) #5 0x00007fadc7bd9abe gdk_pixbuf_loader_size_func (libgdk_pixbuf-2.0.so.0) #6 0x00007fadc7be5c36 png_info_callback (libgdk_pixbuf-2.0.so.0) #7 0x00007fadc3506761 png_push_read_chunk (libpng16.so.16) #8 0x00007fadc35073cb png_process_data (libpng16.so.16) #9 0x00007fadc7be53a9 gdk_pixbuf__png_image_load_increment (libgdk_pixbuf-2.0.so.0) #10 0x00007fadc7bd97d5 gdk_pixbuf_loader_load_module (libgdk_pixbuf-2.0.so.0) #11 0x00007fadc7bda2ba gdk_pixbuf_loader_write (libgdk_pixbuf-2.0.so.0) #12 0x000056009fce550f xfce_backdrop_file_input_stream_ready_cb (xfdesktop) #13 0x00007fadc6f4d876 async_ready_callback_wrapper (libgio-2.0.so.0) #14 0x00007fadc6f76b29 g_task_return_now (libgio-2.0.so.0) #15 0x00007fadc6f76b69 complete_in_idle_cb (libgio-2.0.so.0) #16 0x00007fadc652c07a g_main_context_dispatch (libglib-2.0.so.0) #17 0x00007fadc652c410 g_main_context_iterate.isra.29 (libglib-2.0.so.0) #18 0x00007fadc652c732 g_main_loop_run (libglib-2.0.so.0) #19 0x00007fadc8955f37 gtk_main (libgtk-x11-2.0.so.0) #20 0x000056009fceda2a xfdesktop_application_start (xfdesktop) #21 0x000056009fceddaa cb_wait_for_window_manager_destroyed (xfdesktop) #22 0x00007fadc6528b78 g_source_callback_unref (libglib-2.0.so.0) #23 0x00007fadc652a336 g_source_destroy_internal (libglib-2.0.so.0) #24 0x00007fadc652c110 g_main_context_dispatch (libglib-2.0.so.0) #25 0x00007fadc652c410 g_main_context_iterate.isra.29 (libglib-2.0.so.0) #26 0x00007fadc652c4bc g_main_context_iteration (libglib-2.0.so.0) #27 0x00007fadc6f9cecc g_application_run (libgio-2.0.so.0) #28 0x000056009fce2cdd main (xfdesktop) #29 0x00007fadc5f1e780 __libc_start_main (libc.so.6) #30 0x000056009fce2d19 _start (xfdesktop) Stack trace of thread 3117: #0 0x00007fadc5ffd779 syscall (libc.so.6) #1 0x00007fadc6570e5a g_cond_wait_until (libglib-2.0.so.0) #2 0x00007fadc6500b59 g_async_queue_pop_intern_unlocked (libglib-2.0.so.0) #3 0x00007fadc6553646 g_thread_pool_thread_proxy (libglib-2.0.so.0) #4 0x00007fadc6552cd5 g_thread_proxy (libglib-2.0.so.0) #5 0x00007fadc62cc6da start_thread (libpthread.so.0) #6 0x00007fadc600356d __clone (libc.so.6) Stack trace of thread 2570: #0 0x00007fadc5ff7a5d poll (libc.so.6) #1 0x00007fadc652c3ac g_main_context_iterate.isra.29 (libglib-2.0.so.0) #2 0x00007fadc652c732 g_main_loop_run (libglib-2.0.so.0) #3 0x00007fadc6fd5316 gdbus_shared_thread_func (libgio-2.0.so.0) #4 0x00007fadc6552cd5 g_thread_proxy (libglib-2.0.so.0) #5 0x00007fadc62cc6da start_thread (libpthread.so.0) #6 0x00007fadc600356d __clone (libc.so.6) Stack trace of thread 2569: #0 0x00007fadc5ff7a5d poll (libc.so.6) #1 0x00007fadc652c3ac g_main_context_iterate.isra.29 (libglib-2.0.so.0) #2 0x00007fadc652c4bc g_main_context_iteration (libglib-2.0.so.0) #3 0x00007fadc652c4f9 glib_worker_main (libglib-2.0.so.0) #4 0x00007fadc6552cd5 g_thread_proxy (libglib-2.0.so.0) #5 0x00007fadc62cc6da start_thread (libpthread.so.0) #6 0x00007fadc600356d __clone (libc.so.6) Stack trace of thread 3116: #0 0x00007fadc5ffd779 syscall (libc.so.6) #1 0x00007fadc6570e5a g_cond_wait_until (libglib-2.0.so.0) #2 0x00007fadc6500b59 g_async_queue_pop_intern_unlocked (libglib-2.0.so.0) #3 0x00007fadc6553646 g_thread_pool_thread_proxy (libglib-2.0.so.0) #4 0x00007fadc6552cd5 g_thread_proxy (libglib-2.0.so.0) #5 0x00007fadc62cc6da start_thread (libpthread.so.0) #6 0x00007fadc600356d __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 2567] [New LWP 3117] [New LWP 2570] [New LWP 2569] [New LWP 3116] [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 0x000056009fce55b8 in xfce_backdrop_loader_size_prepared_cb (loader=0x5600a1025980, width=1920, height=1080, user_data=0x5600a0e039c0) at xfce-backdrop.c:1691 1691 if(backdrop->priv->image_style == XFCE_BACKDROP_IMAGE_INVALID) { [Current thread is 1 (Thread 0x7fadcad4ba80 (LWP 2567))] ... (gdb) backtrace full #0 0x000056009fce55b8 in xfce_backdrop_loader_size_prepared_cb (loader=0x5600a1025980, width=1920, height=1080, user_data=0x5600a0e039c0) at xfce-backdrop.c:1691 image_data = 0x5600a0e039c0 backdrop = 0x5600a0ebd740 xscale = yscale = #1 0x00007fadc682c995 in g_closure_invoke () at /lib64/libgobject-2.0.so.0 #2 0x00007fadc683f511 in signal_emit_unlocked_R () at /lib64/libgobject-2.0.so.0 #3 0x00007fadc68484c0 in g_signal_emit_valist () at /lib64/libgobject-2.0.so.0 #4 0x00007fadc684888f in g_signal_emit () at /lib64/libgobject-2.0.so.0 #5 0x00007fadc7bd9abe in gdk_pixbuf_loader_size_func () at /lib64/libgdk_pixbuf-2.0.so.0 #6 0x00007fadc7be5c36 in png_info_callback () at /lib64/libgdk_pixbuf-2.0.so.0 #7 0x00007fadc3506761 in png_push_read_chunk () at /lib64/libpng16.so.16 #8 0x00007fadc35073cb in png_process_data () at /lib64/libpng16.so.16 #9 0x00007fadc7be53a9 in gdk_pixbuf.png_image_load_increment () at /lib64/libgdk_pixbuf-2.0.so.0 #10 0x00007fadc7bd97d5 in gdk_pixbuf_loader_load_module () at /lib64/libgdk_pixbuf-2.0.so.0 #11 0x00007fadc7bda2ba in gdk_pixbuf_loader_write () at /lib64/libgdk_pixbuf-2.0.so.0 #12 0x000056009fce550f in xfce_backdrop_file_input_stream_ready_cb (source_object=0x5600a0dca270, res=0x5600a0dcbe80, user_data=0x5600a0e039c0) at xfce-backdrop.c:1974 stream = 0x5600a0dca270 image_data = 0x5600a0e039c0 bytes = #13 0x00007fadc6f4d876 in async_ready_callback_wrapper () at /lib64/libgio-2.0.so.0 #14 0x00007fadc6f76b29 in g_task_return_now () at /lib64/libgio-2.0.so.0 #15 0x00007fadc6f76b69 in complete_in_idle_cb () at /lib64/libgio-2.0.so.0 #16 0x00007fadc652c07a in g_main_context_dispatch () at /lib64/libglib-2.0.so.0 #17 0x00007fadc652c410 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0 #18 0x00007fadc652c732 in g_main_loop_run () at /lib64/libglib-2.0.so.0 #19 0x00007fadc8955f37 in gtk_main () at /lib64/libgtk-x11-2.0.so.0 #20 0x000056009fceda2a in xfdesktop_application_start (app=0x5600a0d03950) at xfdesktop-application.c:768 gdpy = 0x5600a0d2d000 error = 0x0 i = buf = "/backdrop/screen0/\000\000\000\000\000\000 \000\000\000\000\000\000\000\264\203\325\240\000V\000\000\001\000\b\000\000\000\000\000 \000\000\000\000\000\000\000\337\061\256ŭ\177\000\000P\023Ӡ\000V\000\000\001", '\000' , "@\373+ƭ\177\000\000\020\000\000\000\000\000\000\000\001\000\b\000\000\000\000\000P\023Ӡ\000V\000\000@\203\325\240\000V\000\000\000\000\000\000\000\000\000\000\064\026\370ŭ\177\000\000P\023Ӡ\000V\000\000\000\000\000\000\000\000\000\000 \000\000\000\000\000\000\000O8\256ŭ\177\000\000\000\000\000\000\000\000\000\000 \000\000\000\000\000\000\000\b\224\325\240\000V\000\000\000\000\000\000\001\000\000\000Г\325\240"... ---Type to continue, or q to quit--- __func__ = "xfdesktop_application_start" #21 0x000056009fceddaa in cb_wait_for_window_manager_destroyed (data=0x7fada8005460) at xfdesktop-application.c:630 wfwm = 0x7fada8005460 #22 0x00007fadc6528b78 in g_source_callback_unref () at /lib64/libglib-2.0.so.0 #23 0x00007fadc652a336 in g_source_destroy_internal () at /lib64/libglib-2.0.so.0 #24 0x00007fadc652c110 in g_main_context_dispatch () at /lib64/libglib-2.0.so.0 #25 0x00007fadc652c410 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0 #26 0x00007fadc652c4bc in g_main_context_iteration () at /lib64/libglib-2.0.so.0 #27 0x00007fadc6f9cecc in g_application_run () at /lib64/libgio-2.0.so.0 #28 0x000056009fce2cdd in main (argc=5, argv=0x7ffd26a77598) at main.c:86 app = 0x5600a0d03950 ret = 0 (gdb)