Attachment 125668 Details for Bug 97279 – gdb backtrace of the crash

gdb backtrace of the crash

file_97279.txt (text/plain), 22.51 KB, created by Paul Wise on 2016-08-10 13:55:51 UTC

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Creator: Paul Wise

Created: 2016-08-10 13:55:51 UTC

Size: 22.51 KB

patch

obsolete

>$ gdb -batch -n -ex 'set height 0' -ex bt -ex 'thread apply all bt full' --core /var/crash/1000/18812-1000-1000-11-1470679512-chianamo--usr-bin-totem.core /usr/bin/totem
>[New LWP 18812]
>[New LWP 23539]
>[New LWP 18818]
>[New LWP 23553]
>[New LWP 18817]
>[New LWP 18825]
>[Thread debugging using libthread_db enabled]
>Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
>Core was generated by `totem <removed>'.
>Program terminated with signal SIGSEGV, Segmentation fault.
>#0  unsafe_free (info=0x55d85338ad50) at ../../../src/util/ralloc.c:247
>247     ../../../src/util/ralloc.c: No such file or directory.
>[Current thread is 1 (Thread 0x7fd9531ffa80 (LWP 18812))]
>#0  0x00007fd93badba20 in unsafe_free (info=0x55d85338ad50) at ../../../src/util/ralloc.c:247
>#1  0x00007fd93badbcb1 in ralloc_free (ptr=<optimized out>) at ../../../src/util/ralloc.c:218
>#2  0x00007fd93ba9dc1c in _mesa_glsl_release_builtin_functions() (this=0x7fd93c070cc0 <builtins>, this=0x7fd93c070cc0 <builtins>) at ../../../src/compiler/glsl/builtin_functions.cpp:899
>#3  0x00007fd93ba9dc1c in _mesa_glsl_release_builtin_functions() () at ../../../src/compiler/glsl/builtin_functions.cpp:5444
>#4  0x00007fd93bac9759 in _mesa_destroy_shader_compiler() () at ../../../src/compiler/glsl/glsl_parser_extras.cpp:1957
>#5  0x00007fd93bac9759 in _mesa_destroy_shader_compiler() () at ../../../src/compiler/glsl/glsl_parser_extras.cpp:1944
>#6  0x00007fd93b8a0af9 in one_time_fini () at ../../../src/mesa/main/context.c:357
>#7  0x00007fd9513d7b78 in __run_exit_handlers (status=status@entry=0, listp=0x7fd95173d5f8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true) at exit.c:82
>#8  0x00007fd9513d7bc5 in __GI_exit (status=status@entry=0) at exit.c:104
>#9  0x00007fd952e9d9c4 in totem_object_exit (totem=<optimized out>) at totem-object.c:1364
>#10 0x00007fd952e9db3c in main_window_destroy_cb (widget=<optimized out>, event=<optimized out>, totem=<optimized out>) at totem-object.c:1370
>#11 0x00007fd95246e57a in _gtk_marshal_BOOLEAN__BOXEDv (closure=0x55d8529bbbc0, return_value=0x7ffe0b0b9950, instance=<optimized out>, args=<optimized out>, marshal_data=<optimized out>, n_params=<optimized out>, param_types=0x55d852287be0) at /build/gtk+3.0-MFQuqz/gtk+3.0-3.20.6/./gtk/gtkmarshalers.c:131
>#12 0x00007fd951c811d4 in _g_closure_invoke_va (closure=closure@entry=0x55d8529bbbc0, return_value=return_value@entry=0x7ffe0b0b9950, instance=instance@entry=0x55d8529c43e0, args=args@entry=0x7ffe0b0b9a20, n_params=<optimized out>, param_types=0x55d852287be0) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./gobject/gclosure.c:867
>#13 0x00007fd951c9b4b8 in g_signal_emit_valist (instance=0x55d8529c43e0, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7ffe0b0b9a20) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./gobject/gsignal.c:3294
>#14 0x00007fd951c9c08f in g_signal_emit (instance=instance@entry=0x55d8529c43e0, signal_id=<optimized out>, detail=detail@entry=0) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./gobject/gsignal.c:3441
>#15 0x00007fd9525b13dc in gtk_widget_event_internal (widget=0x55d8529c43e0 [GtkApplicationWindow], event=0x55d8533c0990) at /build/gtk+3.0-MFQuqz/gtk+3.0-3.20.6/./gtk/gtkwidget.c:7705
>#16 0x00007fd95246d65d in gtk_main_do_event (event=event@entry=0x55d8533c0990) at /build/gtk+3.0-MFQuqz/gtk+3.0-3.20.6/./gtk/gtkmain.c:1760
>#17 0x00007fd9525c76d1 in send_delete_event (data=0x55d8529c43e0) at /build/gtk+3.0-MFQuqz/gtk+3.0-3.20.6/./gtk/gtkwindow.c:1320
>#18 0x00007fd94e828b38 in gdk_threads_dispatch (data=0x55d8553f60e0) at /build/gtk+3.0-MFQuqz/gtk+3.0-3.20.6/./gdk/gdk.c:720
>#19 0x00007fd9519aa05a in g_main_context_dispatch (context=0x55d85227b540) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:3154
>#20 0x00007fd9519aa05a in g_main_context_dispatch (context=context@entry=0x55d85227b540) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:3769
>#21 0x00007fd9519aa400 in g_main_context_iterate (context=context@entry=0x55d85227b540, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:3840
>#22 0x00007fd9519aa4ac in g_main_context_iteration (context=context@entry=0x55d85227b540, may_block=may_block@entry=1) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:3901
>#23 0x00007fd951f71cdd in g_application_run (application=0x55d8522581a0 [TotemObject], argc=2, argv=0x7ffe0b0b9e78) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./gio/gapplication.c:2381
>#24 0x000055d8504dcdf8 in main (argc=2, argv=0x7ffe0b0b9e78) at totem.c:83
>
>Thread 6 (Thread 0x7fd939903700 (LWP 18825)):
>#0  0x00007fd95148019d in poll () at ../sysdeps/unix/syscall-template.S:84
>#1  0x00007fd9519aa39c in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x55d8522ef300, timeout=<optimized out>, context=0x55d852393c80) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:4135
>        poll_func = 0x7fd9519b9290 <g_poll>
>        max_priority = 2147483647
>        timeout = -1
>        some_ready = <optimized out>
>        nfds = 1
>        allocated_nfds = 1
>        fds = 0x55d8522ef300
>#2  0x00007fd9519aa39c in g_main_context_iterate (context=context@entry=0x55d852393c80, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:3835
>        max_priority = 2147483647
>        timeout = -1
>        some_ready = <optimized out>
>        nfds = 1
>        allocated_nfds = 1
>        fds = 0x55d8522ef300
>#3  0x00007fd9519aa4ac in g_main_context_iteration (context=context@entry=0x55d852393c80, may_block=may_block@entry=1) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:3901
>        retval = <optimized out>
>#4  0x00007fd93990b41d in dconf_gdbus_worker_thread (user_data=0x55d852393c80) at dconf-gdbus-thread.c:82
>        context = 0x55d852393c80
>#5  0x00007fd9519d0bc5 in g_thread_proxy (data=0x55d852618f70) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gthread.c:780
>        thread = 0x55d852618f70
>#6  0x00007fd95174a464 in start_thread (arg=0x7fd939903700) at pthread_create.c:333
>        __res = <optimized out>
>        pd = 0x7fd939903700
>        now = <optimized out>
>        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140570950383360, -8553772487113669356, 0, 140729083728575, 3, 94387580779648, 8572766948437558548, 8572680881059038484}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
>        not_first_call = <optimized out>
>        pagesize_m1 = <optimized out>
>        sp = <optimized out>
>        freesize = <optimized out>
>        __PRETTY_FUNCTION__ = "start_thread"
>#7  0x00007fd95148930d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
>
>Thread 5 (Thread 0x7fd93e9b0700 (LWP 18817)):
>#0  0x00007fd95148019d in poll () at ../sysdeps/unix/syscall-template.S:84
>#1  0x00007fd9519aa39c in g_main_context_iterate (priority=2147483647, n_fds=2, fds=0x55d8522cd550, timeout=<optimized out>, context=0x55d8522c3c20) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:4135
>        poll_func = 0x7fd9519b9290 <g_poll>
>        max_priority = 2147483647
>        timeout = -1
>        some_ready = <optimized out>
>        nfds = 2
>        allocated_nfds = 2
>        fds = 0x55d8522cd550
>#2  0x00007fd9519aa39c in g_main_context_iterate (context=context@entry=0x55d8522c3c20, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:3835
>        max_priority = 2147483647
>        timeout = -1
>        some_ready = <optimized out>
>        nfds = 2
>        allocated_nfds = 2
>        fds = 0x55d8522cd550
>#3  0x00007fd9519aa4ac in g_main_context_iteration (context=0x55d8522c3c20, may_block=may_block@entry=1) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:3901
>        retval = <optimized out>
>#4  0x00007fd9519aa4e9 in glib_worker_main (data=<optimized out>) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:5672
>#5  0x00007fd9519d0bc5 in g_thread_proxy (data=0x55d852272450) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gthread.c:780
>        thread = 0x55d852272450
>#6  0x00007fd95174a464 in start_thread (arg=0x7fd93e9b0700) at pthread_create.c:333
>        __res = <optimized out>
>        pd = 0x7fd93e9b0700
>        now = <optimized out>
>        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140571034978048, -8553772487113669356, 0, 140729083725647, 3, 0, 8572769067467048212, 8572680881059038484}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
>        not_first_call = <optimized out>
>        pagesize_m1 = <optimized out>
>        sp = <optimized out>
>        freesize = <optimized out>
>        __PRETTY_FUNCTION__ = "start_thread"
>#7  0x00007fd95148930d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
>
>Thread 4 (Thread 0x7fd914f33700 (LWP 23553)):
>#0  0x00007fd951484e49 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
>#1  0x00007fd9519eed4a in g_cond_wait_until (cond=cond@entry=0x55d8522c3b38, mutex=mutex@entry=0x55d8522c3b30, end_time=end_time@entry=50196208829) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gthread-posix.c:1441
>        now = {tv_sec = 50181, tv_nsec = 208830509}
>        span = {tv_sec = 14, tv_nsec = 999998491}
>        sampled = 1
>        res = <optimized out>
>#2  0x00007fd95197e999 in g_async_queue_pop_intern_unlocked (queue=queue@entry=0x55d8522c3b30, wait=wait@entry=1, end_time=end_time@entry=50196208829) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gasyncqueue.c:422
>        retval = <optimized out>
>        __func__ = "g_async_queue_pop_intern_unlocked"
>#3  0x00007fd95197efbb in g_async_queue_timeout_pop (queue=0x55d8522c3b30, timeout=timeout@entry=15000000) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gasyncqueue.c:543
>        end_time = 50196208829
>        retval = <optimized out>
>#4  0x00007fd9519d161a in g_thread_pool_thread_proxy () at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gthreadpool.c:167
>        pool = <optimized out>
>        local_wakeup_thread_serial = <optimized out>
>        last_wakeup_thread_serial = <optimized out>
>        have_relayed_thread_marker = <optimized out>
>        free_pool = <optimized out>
>        task = 0x2
>        pool = <optimized out>
>#5  0x00007fd9519d161a in g_thread_pool_thread_proxy (data=<optimized out>) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gthreadpool.c:364
>        free_pool = <optimized out>
>        task = 0x2
>        pool = <optimized out>
>#6  0x00007fd9519d0bc5 in g_thread_proxy (data=0x55d852c2a000) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gthread.c:780
>        thread = 0x55d852c2a000
>#7  0x00007fd95174a464 in start_thread (arg=0x7fd914f33700) at pthread_create.c:333
>        __res = <optimized out>
>        pd = 0x7fd914f33700
>        now = <optimized out>
>        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140570336114432, -8553772487113669356, 0, 140571026581487, 3, 140571026581616, 8572827120929375508, 8572680881059038484}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
>        not_first_call = <optimized out>
>        pagesize_m1 = <optimized out>
>        sp = <optimized out>
>        freesize = <optimized out>
>        __PRETTY_FUNCTION__ = "start_thread"
>#8  0x00007fd95148930d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
>
>Thread 3 (Thread 0x7fd93e1af700 (LWP 18818)):
>#0  0x00007fd95148019d in poll () at ../sysdeps/unix/syscall-template.S:84
>#1  0x00007fd9519aa39c in g_main_context_iterate (priority=2147483647, n_fds=3, fds=0x55d852c563b0, timeout=<optimized out>, context=0x55d8522ce800) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:4135
>        poll_func = 0x7fd9519b9290 <g_poll>
>        max_priority = 2147483647
>        timeout = -1
>        some_ready = <optimized out>
>        nfds = 3
>        allocated_nfds = 3
>        fds = 0x55d852c563b0
>#2  0x00007fd9519aa39c in g_main_context_iterate (context=0x55d8522ce800, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:3835
>        max_priority = 2147483647
>        timeout = -1
>        some_ready = <optimized out>
>        nfds = 3
>        allocated_nfds = 3
>        fds = 0x55d852c563b0
>#3  0x00007fd9519aa722 in g_main_loop_run (loop=0x55d8522cda20) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:4034
>        __func__ = "g_main_loop_run"
>#4  0x00007fd951fa8916 in gdbus_shared_thread_func (user_data=0x55d8522cc690) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./gio/gdbusprivate.c:246
>        data = 0x55d8522cc690
>#5  0x00007fd9519d0bc5 in g_thread_proxy (data=0x55d8522724a0) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gthread.c:780
>        thread = 0x55d8522724a0
>#6  0x00007fd95174a464 in start_thread (arg=0x7fd93e1af700) at pthread_create.c:333
>        __res = <optimized out>
>        pd = 0x7fd93e1af700
>        now = <optimized out>
>        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140571026585344, -8553772487113669356, 0, 140729083725999, 3, 94387579963024, 8572770167515546900, 8572680881059038484}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
>        not_first_call = <optimized out>
>        pagesize_m1 = <optimized out>
>        sp = <optimized out>
>        freesize = <optimized out>
>        __PRETTY_FUNCTION__ = "start_thread"
>#7  0x00007fd95148930d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
>
>Thread 2 (Thread 0x7fd935710700 (LWP 23539)):
>#0  0x00007fd93b87bbe0 in __do_global_dtors_aux () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
>#1  0x00007fd9530fb9b7 in _dl_fini () at dl-fini.c:235
>        array = 0x7fd93c031830
>        i = 0
>        l = 0x55d85247e440
>        maps = 0x7fd93570f290
>        i = <optimized out>
>        l = <optimized out>
>        nmaps = <optimized out>
>        nloaded = <optimized out>
>        ns = 0
>        do_audit = 0
>        __PRETTY_FUNCTION__ = "_dl_fini"
>#2  0x00007fd9513d7b78 in __run_exit_handlers (status=status@entry=1, listp=0x7fd95173d5f8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true) at exit.c:82
>        atfct = <optimized out>
>        onfct = <optimized out>
>        cxafct = <optimized out>
>#3  0x00007fd9513d7bc5 in __GI_exit (status=status@entry=1) at exit.c:104
>#4  0x00007fd952e99be8 in totem_object_wait_force_exit (user_data=<optimized out>) at totem-object.c:1305
>#5  0x00007fd9519d0bc5 in g_thread_proxy (data=0x55d852dc9850) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gthread.c:780
>        thread = 0x55d852dc9850
>#6  0x00007fd95174a464 in start_thread (arg=0x7fd935710700) at pthread_create.c:333
>        __res = <optimized out>
>        pd = 0x7fd935710700
>        now = <optimized out>
>        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140570881230592, -8553772487113669356, 0, 140729083729455, 3, 140729083729584, 8572760082395464980, 8572680881059038484}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
>        not_first_call = <optimized out>
>        pagesize_m1 = <optimized out>
>        sp = <optimized out>
>        freesize = <optimized out>
>        __PRETTY_FUNCTION__ = "start_thread"
>#7  0x00007fd95148930d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
>
>Thread 1 (Thread 0x7fd9531ffa80 (LWP 18812)):
>#0  0x00007fd93badba20 in unsafe_free (info=0x55d85338ad50) at ../../../src/util/ralloc.c:247
>        temp = 0xf7f7f7f7f7f7f7f7
>#1  0x00007fd93badbcb1 in ralloc_free (ptr=<optimized out>) at ../../../src/util/ralloc.c:218
>        info = 0x55d853315bc0
>#2  0x00007fd93ba9dc1c in _mesa_glsl_release_builtin_functions() (this=0x7fd93c070cc0 <builtins>, this=0x7fd93c070cc0 <builtins>) at ../../../src/compiler/glsl/builtin_functions.cpp:899
>#3  0x00007fd93ba9dc1c in _mesa_glsl_release_builtin_functions() () at ../../../src/compiler/glsl/builtin_functions.cpp:5444
>#4  0x00007fd93bac9759 in _mesa_destroy_shader_compiler() () at ../../../src/compiler/glsl/glsl_parser_extras.cpp:1957
>#5  0x00007fd93bac9759 in _mesa_destroy_shader_compiler() () at ../../../src/compiler/glsl/glsl_parser_extras.cpp:1944
>#6  0x00007fd93b8a0af9 in one_time_fini () at ../../../src/mesa/main/context.c:357
>#7  0x00007fd9513d7b78 in __run_exit_handlers (status=status@entry=0, listp=0x7fd95173d5f8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true) at exit.c:82
>        atfct = <optimized out>
>        onfct = <optimized out>
>        cxafct = <optimized out>
>#8  0x00007fd9513d7bc5 in __GI_exit (status=status@entry=0) at exit.c:104
>#9  0x00007fd952e9d9c4 in totem_object_exit (totem=<optimized out>) at totem-object.c:1364
>        display = <optimized out>
>#10 0x00007fd952e9db3c in main_window_destroy_cb (widget=<optimized out>, event=<optimized out>, totem=<optimized out>) at totem-object.c:1370
>#11 0x00007fd95246e57a in _gtk_marshal_BOOLEAN__BOXEDv (closure=0x55d8529bbbc0, return_value=0x7ffe0b0b9950, instance=<optimized out>, args=<optimized out>, marshal_data=<optimized out>, n_params=<optimized out>, param_types=0x55d852287be0) at /build/gtk+3.0-MFQuqz/gtk+3.0-3.20.6/./gtk/gtkmarshalers.c:131
>        cc = 0x55d8529bbbc0
>        data1 = <optimized out>
>        data2 = <optimized out>
>        callback = <optimized out>
>        arg0 = 0x55d8533c0990
>Python Exception <class 'gdb.error'> Attempt to dereference a generic pointer.: 
>#12 0x00007fd951c811d4 in _g_closure_invoke_va (closure=closure@entry=0x55d8529bbbc0, return_value=return_value@entry=0x7ffe0b0b9950, instance=instance@entry=0x55d8529c43e0, args=args@entry=0x7ffe0b0b9a20, n_params=<optimized out>, param_types=0x55d852287be0) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./gobject/gclosure.c:867
>        marshal = <optimized out>
>        marshal_data = <optimized out>
>        in_marshal = 0
>        real_closure = 0x55d8529bbba0
>        __func__ = "_g_closure_invoke_va"
>#13 0x00007fd951c9b4b8 in g_signal_emit_valist (instance=0x55d8529c43e0, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7ffe0b0b9a20) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./gobject/gsignal.c:3294
>        return_accu = <optimized out>
>        accu = {g_type = 20, data = {{v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
>        accumulator = 0x55d85228ea40
>        emission = {next = 0x0, instance = 0x55d8529c43e0, ihint = {signal_id = 78, detail = 0, run_type = G_SIGNAL_RUN_FIRST}, state = EMISSION_RUN, chain_type = 94387587218224}
>        signal_id = <optimized out>
>        instance_type = <optimized out>
>        emission_return = {g_type = 20, data = {{v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
>        rtype = 20
>        static_scope = 0
>        fastpath_handler = <optimized out>
>        closure = <optimized out>
>        run_type = <optimized out>
>        l = <optimized out>
>        fastpath = <optimized out>
>        instance_and_params = <optimized out>
>        signal_return_type = <optimized out>
>        param_values = <optimized out>
>        i = <optimized out>
>        n_params = <optimized out>
>        __func__ = "g_signal_emit_valist"
>#14 0x00007fd951c9c08f in g_signal_emit (instance=instance@entry=0x55d8529c43e0, signal_id=<optimized out>, detail=detail@entry=0) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./gobject/gsignal.c:3441
>Python Exception <class 'gdb.error'> Attempt to dereference a generic pointer.: 
>#15 0x00007fd9525b13dc in gtk_widget_event_internal (widget=0x55d8529c43e0 [GtkApplicationWindow], event=0x55d8533c0990) at /build/gtk+3.0-MFQuqz/gtk+3.0-3.20.6/./gtk/gtkwidget.c:7705
>        signal_num = <optimized out>
>        return_val = 0
>        handled = 0
>        event = 0x55d8533c0990
>        widget = 0x55d8529c43e0 [GtkApplicationWindow]
>#16 0x00007fd95246d65d in gtk_main_do_event (event=event@entry=0x55d8533c0990) at /build/gtk+3.0-MFQuqz/gtk+3.0-3.20.6/./gtk/gtkmain.c:1760
>        event_widget = 0x55d8529c43e0 [GtkApplicationWindow]
>        grab_widget = 0x55d8529c43e0 [GtkApplicationWindow]
>        topmost_widget = <optimized out>
>        window_group = 0x55d852e74670 [GtkWindowGroup]
>        rewritten_event = <optimized out>
>        device = 0x0
>        tmp_list = <optimized out>
>        __func__ = "gtk_main_do_event"
>#17 0x00007fd9525c76d1 in send_delete_event (data=0x55d8529c43e0) at /build/gtk+3.0-MFQuqz/gtk+3.0-3.20.6/./gtk/gtkwindow.c:1320
>        window = 0x55d8529c43e0 [GtkApplicationWindow]
>        priv = 0x55d8529c41a0
>        event = 0x55d8533c0990
>#18 0x00007fd94e828b38 in gdk_threads_dispatch (data=0x55d8553f60e0) at /build/gtk+3.0-MFQuqz/gtk+3.0-3.20.6/./gdk/gdk.c:720
>        dispatch = 0x55d8553f60e0
>        ret = 0
>#19 0x00007fd9519aa05a in g_main_context_dispatch (context=0x55d85227b540) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:3154
>        dispatch = 0x7fd9519a6b10 <g_idle_dispatch>
>        prev_source = 0x0
>        was_in_call = 0
>        user_data = 0x55d8553f60e0
>        callback = 0x7fd94e828b10 <gdk_threads_dispatch>
>        cb_funcs = <optimized out>
>        cb_data = 0x55d8558febd0
>        need_destroy = <optimized out>
>        source = 0x55d854a61900
>        current = 0x55d8522b5f40
>        i = 0
>#20 0x00007fd9519aa05a in g_main_context_dispatch (context=context@entry=0x55d85227b540) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:3769
>#21 0x00007fd9519aa400 in g_main_context_iterate (context=context@entry=0x55d85227b540, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:3840
>        max_priority = 200
>        timeout = 0
>        some_ready = 1
>        nfds = <optimized out>
>        allocated_nfds = 5
>        fds = 0x55d8529b4cf0
>#22 0x00007fd9519aa4ac in g_main_context_iteration (context=context@entry=0x55d85227b540, may_block=may_block@entry=1) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./glib/gmain.c:3901
>        retval = <optimized out>
>#23 0x00007fd951f71cdd in g_application_run (application=0x55d8522581a0 [TotemObject], argc=2, argv=0x7ffe0b0b9e78) at /build/glib2.0-vjfO_h/glib2.0-2.48.1/./gio/gapplication.c:2381
>        arguments = 0x55d852257fd0
>        status = 0
>        context = 0x55d85227b540
>        acquired_context = <optimized out>
>        __func__ = "g_application_run"
>#24 0x000055d8504dcdf8 in main (argc=2, argv=0x7ffe0b0b9e78) at totem.c:83
>        totem = 0x55d8522581a0 [TotemObject]

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