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camera v6.2.2 crashes on launch on Fedora

Aperta
  • Qualcosa non va?
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Nessuno ha ancora preso questa issue.

Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
25/100
Tipo di issue
Bug
Chiarezza
Da chiarire
Stato di attività
Ferma
Stack tecnologico
fedora, linux
Ambito
desktop, operating-systems

Direzione di ricerca

Inizia da CameraView.vala:162 e MainWindow.vala:113, dove avviene l’enumerazione dei dispositivi durante l’avvio. Riproduci il crash all’avvio su Fedora con GNOME/Wayland e GNOME/Xorg, quindi confronta le tracce di Valgrind con gli avvisi di GDK, GStreamer e PipeWire. Il lavoro è completato quando Camera si avvia senza il crash segnalato o accessi alla memoria non validi.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

I got a crash report that Camera crashes on start on Fedora 38 (GNOME/Wayland), and I was able to reproduce the same issue on Fedora 39 (both GNOME/Wayland and GNOME/Xorg) - I don't have a fully functional Pantheon session yet where I can test this, but I don't think Pantheon and GNOME/Xorg should be different here.

On Wayland, there are some Gdk-WARNING log messages, and on Xorg, there are GStreamer-CRITICAL log messages, but the crash that immediately follows those looks similar (null pointer dereference?).

I ran valgrind io.elementary.camera on both GNOME/Wayland and GNOME/Xorg on Fedora 39 and these are the logs that also includes the backtraces for the invalid reads / writes (there seem to be both use-after-free issues and null-pointer dereferences).

log: valgrind io.elementary.camera on Wayland 
==715736== Memcheck, a memory error detector
==715736== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==715736== Using Valgrind-3.22.0 and LibVEX; rerun with -h for copyright info
==715736== Command: io.elementary.camera
==715736== 
==715736== Invalid write of size 8
==715736==    at 0x1A1DF7D8: UnknownInlinedFun (list.h:61)
==715736==    by 0x1A1DF7D8: destroy_port (gstpipewiredeviceprovider.c:489)
==715736==    by 0x1A27BB87: pw_proxy_destroy (proxy.c:230)
==715736==    by 0x1A27BDB7: pw_proxy_remove (proxy.c:254)
==715736==    by 0x1A246D08: UnknownInlinedFun (core.c:166)
==715736==    by 0x1A246D08: UnknownInlinedFun (map.h:218)
==715736==    by 0x1A246D08: UnknownInlinedFun (core.c:205)
==715736==    by 0x1A246D08: proxy_core_removed (core.c:186)
==715736==    by 0x1A27BDB7: pw_proxy_remove (proxy.c:254)
==715736==    by 0x1A247177: pw_core_disconnect (core.c:487)
==715736==    by 0x1A1DC777: gst_pipewire_core_release (gstpipewirecore.c:174)
==715736==    by 0x1A1DF3B6: gst_pipewire_device_provider_probe (gstpipewiredeviceprovider.c:624)
==715736==    by 0x48D5C8F: gst_device_provider_get_devices (gstdeviceprovider.c:424)
==715736==    by 0x48EAC79: gst_device_monitor_get_devices (gstdevicemonitor.c:447)
==715736==    by 0x1158CD: UnknownInlinedFun (CameraView.vala:162)
==715736==    by 0x1158CD: camera_main_window_constructor (MainWindow.vala:113)
==715736==    by 0x49DEA4B: g_object_new_with_custom_constructor (gobject.c:2163)
==715736==  Address 0x17f293c0 is 288 bytes inside a block of size 304 free'd
==715736==    at 0x4845B2C: free (vg_replace_malloc.c:985)
==715736==    by 0x1A246D08: UnknownInlinedFun (core.c:166)
==715736==    by 0x1A246D08: UnknownInlinedFun (map.h:218)
==715736==    by 0x1A246D08: UnknownInlinedFun (core.c:205)
==715736==    by 0x1A246D08: proxy_core_removed (core.c:186)
==715736==    by 0x1A27BDB7: pw_proxy_remove (proxy.c:254)
==715736==    by 0x1A247177: pw_core_disconnect (core.c:487)
==715736==    by 0x1A1DC777: gst_pipewire_core_release (gstpipewirecore.c:174)
==715736==    by 0x1A1DF3B6: gst_pipewire_device_provider_probe (gstpipewiredeviceprovider.c:624)
==715736==    by 0x48D5C8F: gst_device_provider_get_devices (gstdeviceprovider.c:424)
==715736==    by 0x48EAC79: gst_device_monitor_get_devices (gstdevicemonitor.c:447)
==715736==    by 0x1158CD: UnknownInlinedFun (CameraView.vala:162)
==715736==    by 0x1158CD: camera_main_window_constructor (MainWindow.vala:113)
==715736==    by 0x49DEA4B: g_object_new_with_custom_constructor (gobject.c:2163)
==715736==    by 0x49E0D29: UnknownInlinedFun (gobject.c:2243)
==715736==    by 0x49E0D29: g_object_new_valist (gobject.c:2584)
==715736==    by 0x49E155E: g_object_new (gobject.c:2057)
==715736==  Block was alloc'd at
==715736==    at 0x4849E60: calloc (vg_replace_malloc.c:1595)
==715736==    by 0x1A27B75E: pw_proxy_new (proxy.c:80)
==715736==    by 0x1A45E46D: registry_marshal_bind.lto_priv.0 (protocol-native.c:1852)
==715736==    by 0x1A1E07D7: UnknownInlinedFun (core.h:517)
==715736==    by 0x1A1E07D7: registry_event_global (gstpipewiredeviceprovider.c:510)
==715736==    by 0x1A45BBD1: registry_demarshal_global.lto_priv.0 (protocol-native.c:1826)
==715736==    by 0x1A449020: process_remote (module-protocol-native.c:1037)
==715736==    by 0x1A449807: on_remote_data (module-protocol-native.c:1071)
==715736==    by 0x1A2EEF15: loop_iterate (loop.c:496)
==715736==    by 0x1A290E16: do_loop (thread-loop.c:295)
==715736==    by 0x58F9896: start_thread (pthread_create.c:444)
==715736==    by 0x5980563: clone (clone.S:100)
==715736== 
==715736== Invalid write of size 8
==715736==    at 0x1A1DF7DF: UnknownInlinedFun (list.h:62)
==715736==    by 0x1A1DF7DF: destroy_port (gstpipewiredeviceprovider.c:489)
==715736==    by 0x1A27BB87: pw_proxy_destroy (proxy.c:230)
==715736==    by 0x1A27BDB7: pw_proxy_remove (proxy.c:254)
==715736==    by 0x1A246D08: UnknownInlinedFun (core.c:166)
==715736==    by 0x1A246D08: UnknownInlinedFun (map.h:218)
==715736==    by 0x1A246D08: UnknownInlinedFun (core.c:205)
==715736==    by 0x1A246D08: proxy_core_removed (core.c:186)
==715736==    by 0x1A27BDB7: pw_proxy_remove (proxy.c:254)
==715736==    by 0x1A247177: pw_core_disconnect (core.c:487)
==715736==    by 0x1A1DC777: gst_pipewire_core_release (gstpipewirecore.c:174)
==715736==    by 0x1A1DF3B6: gst_pipewire_device_provider_probe (gstpipewiredeviceprovider.c:624)
==715736==    by 0x48D5C8F: gst_device_provider_get_devices (gstdeviceprovider.c:424)
==715736==    by 0x48EAC79: gst_device_monitor_get_devices (gstdevicemonitor.c:447)
==715736==    by 0x1158CD: UnknownInlinedFun (CameraView.vala:162)
==715736==    by 0x1158CD: camera_main_window_constructor (MainWindow.vala:113)
==715736==    by 0x49DEA4B: g_object_new_with_custom_constructor (gobject.c:2163)
==715736==  Address 0x17f293c8 is 296 bytes inside a block of size 304 free'd
==715736==    at 0x4845B2C: free (vg_replace_malloc.c:985)
==715736==    by 0x1A246D08: UnknownInlinedFun (core.c:166)
==715736==    by 0x1A246D08: UnknownInlinedFun (map.h:218)
==715736==    by 0x1A246D08: UnknownInlinedFun (core.c:205)
==715736==    by 0x1A246D08: proxy_core_removed (core.c:186)
==715736==    by 0x1A27BDB7: pw_proxy_remove (proxy.c:254)
==715736==    by 0x1A247177: pw_core_disconnect (core.c:487)
==715736==    by 0x1A1DC777: gst_pipewire_core_release (gstpipewirecore.c:174)
==715736==    by 0x1A1DF3B6: gst_pipewire_device_provider_probe (gstpipewiredeviceprovider.c:624)
==715736==    by 0x48D5C8F: gst_device_provider_get_devices (gstdeviceprovider.c:424)
==715736==    by 0x48EAC79: gst_device_monitor_get_devices (gstdevicemonitor.c:447)
==715736==    by 0x1158CD: UnknownInlinedFun (CameraView.vala:162)
==715736==    by 0x1158CD: camera_main_window_constructor (MainWindow.vala:113)
==715736==    by 0x49DEA4B: g_object_new_with_custom_constructor (gobject.c:2163)
==715736==    by 0x49E0D29: UnknownInlinedFun (gobject.c:2243)
==715736==    by 0x49E0D29: g_object_new_valist (gobject.c:2584)
==715736==    by 0x49E155E: g_object_new (gobject.c:2057)
==715736==  Block was alloc'd at
==715736==    at 0x4849E60: calloc (vg_replace_malloc.c:1595)
==715736==    by 0x1A27B75E: pw_proxy_new (proxy.c:80)
==715736==    by 0x1A45E46D: registry_marshal_bind.lto_priv.0 (protocol-native.c:1852)
==715736==    by 0x1A1E07D7: UnknownInlinedFun (core.h:517)
==715736==    by 0x1A1E07D7: registry_event_global (gstpipewiredeviceprovider.c:510)
==715736==    by 0x1A45BBD1: registry_demarshal_global.lto_priv.0 (protocol-native.c:1826)
==715736==    by 0x1A449020: process_remote (module-protocol-native.c:1037)
==715736==    by 0x1A449807: on_remote_data (module-protocol-native.c:1071)
==715736==    by 0x1A2EEF15: loop_iterate (loop.c:496)
==715736==    by 0x1A290E16: do_loop (thread-loop.c:295)
==715736==    by 0x58F9896: start_thread (pthread_create.c:444)
==715736==    by 0x5980563: clone (clone.S:100)
==715736== 

(io.elementary.camera:715736): Gdk-WARNING **: 01:25:22.780: eglMakeCurrent failed

(io.elementary.camera:715736): Gdk-WARNING **: 01:25:22.801: eglMakeCurrent failed

(io.elementary.camera:715736): Gdk-WARNING **: 01:25:23.156: eglMakeCurrent failed
==715736== Invalid read of size 1
==715736==    at 0x56F74D4: UnknownInlinedFun (gdkglcontext.c:420)
==715736==    by 0x56F74D4: gdk_gl_texture_from_surface (gdkgl.c:734)
==715736==    by 0x5700CBF: gdk_window_end_paint_internal (gdkwindow.c:3060)
==715736==    by 0x5700DDA: UnknownInlinedFun (gdkwindow.c:3311)
==715736==    by 0x5700DDA: gdk_window_end_draw_frame (gdkwindow.c:3294)
==715736==    by 0x52503B9: gtk_widget_render (gtkwidget.c:17613)
==715736==    by 0x50ED7FF: UnknownInlinedFun (gtkmain.c:1844)
==715736==    by 0x50ED7FF: gtk_main_do_event (gtkmain.c:1691)
==715736==    by 0x56EB416: UnknownInlinedFun (gdkevents.c:73)
==715736==    by 0x56EB416: _gdk_event_emit (gdkevents.c:67)
==715736==    by 0x56FD7B8: _gdk_window_process_updates_recurse_helper.lto_priv.0 (gdkwindow.c:3874)
==715736==    by 0x5701E84: gdk_window_process_updates_internal (gdkwindow.c:4020)
==715736==    by 0x5702090: UnknownInlinedFun (gdkwindow.c:4215)
==715736==    by 0x5702090: gdk_window_process_updates_with_mode.lto_priv.0 (gdkwindow.c:4186)
==715736==    by 0x49EDE84: UnknownInlinedFun (gclosure.c:895)
==715736==    by 0x49EDE84: signal_emit_valist_unlocked (gsignal.c:3516)
==715736==    by 0x49EDF90: g_signal_emit_valist (gsignal.c:3355)
==715736==    by 0x49EE052: g_signal_emit (gsignal.c:3675)
==715736==  Address 0xffffffffffffffe4 is not stack'd, malloc'd or (recently) free'd
==715736== 
==715736== 
==715736== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==715736==  Access not within mapped region at address 0xFFFFFFFFFFFFFFE4
==715736==    at 0x56F74D4: UnknownInlinedFun (gdkglcontext.c:420)
==715736==    by 0x56F74D4: gdk_gl_texture_from_surface (gdkgl.c:734)
==715736==    by 0x5700CBF: gdk_window_end_paint_internal (gdkwindow.c:3060)
==715736==    by 0x5700DDA: UnknownInlinedFun (gdkwindow.c:3311)
==715736==    by 0x5700DDA: gdk_window_end_draw_frame (gdkwindow.c:3294)
==715736==    by 0x52503B9: gtk_widget_render (gtkwidget.c:17613)
==715736==    by 0x50ED7FF: UnknownInlinedFun (gtkmain.c:1844)
==715736==    by 0x50ED7FF: gtk_main_do_event (gtkmain.c:1691)
==715736==    by 0x56EB416: UnknownInlinedFun (gdkevents.c:73)
==715736==    by 0x56EB416: _gdk_event_emit (gdkevents.c:67)
==715736==    by 0x56FD7B8: _gdk_window_process_updates_recurse_helper.lto_priv.0 (gdkwindow.c:3874)
==715736==    by 0x5701E84: gdk_window_process_updates_internal (gdkwindow.c:4020)
==715736==    by 0x5702090: UnknownInlinedFun (gdkwindow.c:4215)
==715736==    by 0x5702090: gdk_window_process_updates_with_mode.lto_priv.0 (gdkwindow.c:4186)
==715736==    by 0x49EDE84: UnknownInlinedFun (gclosure.c:895)
==715736==    by 0x49EDE84: signal_emit_valist_unlocked (gsignal.c:3516)
==715736==    by 0x49EDF90: g_signal_emit_valist (gsignal.c:3355)
==715736==    by 0x49EE052: g_signal_emit (gsignal.c:3675)
==715736==  If you believe this happened as a result of a stack
==715736==  overflow in your program's main thread (unlikely but
==715736==  possible), you can try to increase the size of the
==715736==  main thread stack using the --main-stacksize= flag.
==715736==  The main thread stack size used in this run was 8388608.
==715736== 
==715736== HEAP SUMMARY:
==715736==     in use at exit: 20,608,344 bytes in 83,818 blocks
==715736==   total heap usage: 845,848 allocs, 762,030 frees, 98,532,554 bytes allocated
==715736== 
==715736== LEAK SUMMARY:
==715736==    definitely lost: 52,528 bytes in 9 blocks
==715736==    indirectly lost: 22,976 bytes in 962 blocks
==715736==      possibly lost: 114,723 bytes in 1,510 blocks
==715736==    still reachable: 19,956,565 bytes in 78,289 blocks
==715736==         suppressed: 0 bytes in 0 blocks
==715736== Rerun with --leak-check=full to see details of leaked memory
==715736== 
==715736== For lists of detected and suppressed errors, rerun with: -s
==715736== ERROR SUMMARY: 35 errors from 3 contexts (suppressed: 0 from 0)
log: valgrind io.elementary.camera on Xorg 
==6350== Memcheck, a memory error detector
==6350== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==6350== Using Valgrind-3.22.0 and LibVEX; rerun with -h for copyright info
==6350== Command: io.elementary.camera
==6350== 
==6350== Invalid write of size 8
==6350==    at 0x1649F7D8: UnknownInlinedFun (list.h:61)
==6350==    by 0x1649F7D8: destroy_port (gstpipewiredeviceprovider.c:489)
==6350==    by 0x19975B87: pw_proxy_destroy (proxy.c:230)
==6350==    by 0x19975DB7: pw_proxy_remove (proxy.c:254)
==6350==    by 0x19940D08: UnknownInlinedFun (core.c:166)
==6350==    by 0x19940D08: UnknownInlinedFun (map.h:218)
==6350==    by 0x19940D08: UnknownInlinedFun (core.c:205)
==6350==    by 0x19940D08: proxy_core_removed (core.c:186)
==6350==    by 0x19975DB7: pw_proxy_remove (proxy.c:254)
==6350==    by 0x19941177: pw_core_disconnect (core.c:487)
==6350==    by 0x1649C777: gst_pipewire_core_release (gstpipewirecore.c:174)
==6350==    by 0x1649F3B6: gst_pipewire_device_provider_probe (gstpipewiredeviceprovider.c:624)
==6350==    by 0x48D1C8F: gst_device_provider_get_devices (gstdeviceprovider.c:424)
==6350==    by 0x48E6C79: gst_device_monitor_get_devices (gstdevicemonitor.c:447)
==6350==    by 0x1158CD: UnknownInlinedFun (CameraView.vala:162)
==6350==    by 0x1158CD: camera_main_window_constructor (MainWindow.vala:113)
==6350==    by 0x49DAA4B: g_object_new_with_custom_constructor (gobject.c:2163)
==6350==  Address 0x1974b400 is 288 bytes inside a block of size 304 free'd
==6350==    at 0x4845B2C: free (vg_replace_malloc.c:985)
==6350==    by 0x19940D08: UnknownInlinedFun (core.c:166)
==6350==    by 0x19940D08: UnknownInlinedFun (map.h:218)
==6350==    by 0x19940D08: UnknownInlinedFun (core.c:205)
==6350==    by 0x19940D08: proxy_core_removed (core.c:186)
==6350==    by 0x19975DB7: pw_proxy_remove (proxy.c:254)
==6350==    by 0x19941177: pw_core_disconnect (core.c:487)
==6350==    by 0x1649C777: gst_pipewire_core_release (gstpipewirecore.c:174)
==6350==    by 0x1649F3B6: gst_pipewire_device_provider_probe (gstpipewiredeviceprovider.c:624)
==6350==    by 0x48D1C8F: gst_device_provider_get_devices (gstdeviceprovider.c:424)
==6350==    by 0x48E6C79: gst_device_monitor_get_devices (gstdevicemonitor.c:447)
==6350==    by 0x1158CD: UnknownInlinedFun (CameraView.vala:162)
==6350==    by 0x1158CD: camera_main_window_constructor (MainWindow.vala:113)
==6350==    by 0x49DAA4B: g_object_new_with_custom_constructor (gobject.c:2163)
==6350==    by 0x49DCD29: UnknownInlinedFun (gobject.c:2243)
==6350==    by 0x49DCD29: g_object_new_valist (gobject.c:2584)
==6350==    by 0x49DD55E: g_object_new (gobject.c:2057)
==6350==  Block was alloc'd at
==6350==    at 0x4849E60: calloc (vg_replace_malloc.c:1595)
==6350==    by 0x1997575E: pw_proxy_new (proxy.c:80)
==6350==    by 0x19B1C46D: registry_marshal_bind.lto_priv.0 (protocol-native.c:1852)
==6350==    by 0x164A07D7: UnknownInlinedFun (core.h:517)
==6350==    by 0x164A07D7: registry_event_global (gstpipewiredeviceprovider.c:510)
==6350==    by 0x19B19BD1: registry_demarshal_global.lto_priv.0 (protocol-native.c:1826)
==6350==    by 0x19B07020: process_remote (module-protocol-native.c:1037)
==6350==    by 0x19B07807: on_remote_data (module-protocol-native.c:1071)
==6350==    by 0x164B0F15: loop_iterate (loop.c:496)
==6350==    by 0x1998AE16: do_loop (thread-loop.c:295)
==6350==    by 0x58F5896: start_thread (pthread_create.c:444)
==6350==    by 0x597C563: clone (clone.S:100)
==6350== 
==6350== Invalid write of size 8
==6350==    at 0x1649F7DF: UnknownInlinedFun (list.h:62)
==6350==    by 0x1649F7DF: destroy_port (gstpipewiredeviceprovider.c:489)
==6350==    by 0x19975B87: pw_proxy_destroy (proxy.c:230)
==6350==    by 0x19975DB7: pw_proxy_remove (proxy.c:254)
==6350==    by 0x19940D08: UnknownInlinedFun (core.c:166)
==6350==    by 0x19940D08: UnknownInlinedFun (map.h:218)
==6350==    by 0x19940D08: UnknownInlinedFun (core.c:205)
==6350==    by 0x19940D08: proxy_core_removed (core.c:186)
==6350==    by 0x19975DB7: pw_proxy_remove (proxy.c:254)
==6350==    by 0x19941177: pw_core_disconnect (core.c:487)
==6350==    by 0x1649C777: gst_pipewire_core_release (gstpipewirecore.c:174)
==6350==    by 0x1649F3B6: gst_pipewire_device_provider_probe (gstpipewiredeviceprovider.c:624)
==6350==    by 0x48D1C8F: gst_device_provider_get_devices (gstdeviceprovider.c:424)
==6350==    by 0x48E6C79: gst_device_monitor_get_devices (gstdevicemonitor.c:447)
==6350==    by 0x1158CD: UnknownInlinedFun (CameraView.vala:162)
==6350==    by 0x1158CD: camera_main_window_constructor (MainWindow.vala:113)
==6350==    by 0x49DAA4B: g_object_new_with_custom_constructor (gobject.c:2163)
==6350==  Address 0x1974b408 is 296 bytes inside a block of size 304 free'd
==6350==    at 0x4845B2C: free (vg_replace_malloc.c:985)
==6350==    by 0x19940D08: UnknownInlinedFun (core.c:166)
==6350==    by 0x19940D08: UnknownInlinedFun (map.h:218)
==6350==    by 0x19940D08: UnknownInlinedFun (core.c:205)
==6350==    by 0x19940D08: proxy_core_removed (core.c:186)
==6350==    by 0x19975DB7: pw_proxy_remove (proxy.c:254)
==6350==    by 0x19941177: pw_core_disconnect (core.c:487)
==6350==    by 0x1649C777: gst_pipewire_core_release (gstpipewirecore.c:174)
==6350==    by 0x1649F3B6: gst_pipewire_device_provider_probe (gstpipewiredeviceprovider.c:624)
==6350==    by 0x48D1C8F: gst_device_provider_get_devices (gstdeviceprovider.c:424)
==6350==    by 0x48E6C79: gst_device_monitor_get_devices (gstdevicemonitor.c:447)
==6350==    by 0x1158CD: UnknownInlinedFun (CameraView.vala:162)
==6350==    by 0x1158CD: camera_main_window_constructor (MainWindow.vala:113)
==6350==    by 0x49DAA4B: g_object_new_with_custom_constructor (gobject.c:2163)
==6350==    by 0x49DCD29: UnknownInlinedFun (gobject.c:2243)
==6350==    by 0x49DCD29: g_object_new_valist (gobject.c:2584)
==6350==    by 0x49DD55E: g_object_new (gobject.c:2057)
==6350==  Block was alloc'd at
==6350==    at 0x4849E60: calloc (vg_replace_malloc.c:1595)
==6350==    by 0x1997575E: pw_proxy_new (proxy.c:80)
==6350==    by 0x19B1C46D: registry_marshal_bind.lto_priv.0 (protocol-native.c:1852)
==6350==    by 0x164A07D7: UnknownInlinedFun (core.h:517)
==6350==    by 0x164A07D7: registry_event_global (gstpipewiredeviceprovider.c:510)
==6350==    by 0x19B19BD1: registry_demarshal_global.lto_priv.0 (protocol-native.c:1826)
==6350==    by 0x19B07020: process_remote (module-protocol-native.c:1037)
==6350==    by 0x19B07807: on_remote_data (module-protocol-native.c:1071)
==6350==    by 0x164B0F15: loop_iterate (loop.c:496)
==6350==    by 0x1998AE16: do_loop (thread-loop.c:295)
==6350==    by 0x58F5896: start_thread (pthread_create.c:444)
==6350==    by 0x597C563: clone (clone.S:100)
==6350== 

(io.elementary.camera:6350): GStreamer-CRITICAL **: 01:25:12.142: gst_bin_add: assertion 'GST_IS_ELEMENT (element)' failed

(io.elementary.camera:6350): GStreamer-CRITICAL **: 01:25:12.168: gst_element_link_pads_full: assertion 'GST_IS_ELEMENT (dest)' failed

(io.elementary.camera:6350): GLib-GObject-CRITICAL **: 01:25:12.169: g_object_get: assertion 'G_IS_OBJECT (object)' failed
==6350== Use of uninitialised value of size 8
==6350==    at 0x4FFCDF4: UnknownInlinedFun (gtkcontainer.c:1862)
==6350==    by 0x4FFCDF4: gtk_container_add (gtkcontainer.c:1856)
==6350==    by 0x112E05: camera_widgets_camera_view_create_pipeline (CameraView.vala:259)
==6350==    by 0x113FDD: camera_widgets_camera_view_change_camera (CameraView.vala:189)
==6350==    by 0x4A6C80F: g_list_foreach (glist.c:1092)
==6350==    by 0x1158E2: UnknownInlinedFun (CameraView.vala:162)
==6350==    by 0x1158E2: camera_main_window_constructor (MainWindow.vala:113)
==6350==    by 0x49DAA4B: g_object_new_with_custom_constructor (gobject.c:2163)
==6350==    by 0x49DCD29: UnknownInlinedFun (gobject.c:2243)
==6350==    by 0x49DCD29: g_object_new_valist (gobject.c:2584)
==6350==    by 0x49DD55E: g_object_new (gobject.c:2057)
==6350==    by 0x110B1C: UnknownInlinedFun (MainWindow.vala:58)
==6350==    by 0x110B1C: UnknownInlinedFun (MainWindow.vala:57)
==6350==    by 0x110B1C: camera_application_real_activate (Application.vala:61)
==6350==    by 0x49E9E84: UnknownInlinedFun (gclosure.c:895)
==6350==    by 0x49E9E84: signal_emit_valist_unlocked (gsignal.c:3516)
==6350==    by 0x49E9F90: g_signal_emit_valist (gsignal.c:3355)
==6350==    by 0x49EA052: g_signal_emit (gsignal.c:3675)
==6350== 
==6350== Invalid read of size 8
==6350==    at 0x4FFCDF4: UnknownInlinedFun (gtkcontainer.c:1862)
==6350==    by 0x4FFCDF4: gtk_container_add (gtkcontainer.c:1856)
==6350==    by 0x112E05: camera_widgets_camera_view_create_pipeline (CameraView.vala:259)
==6350==    by 0x113FDD: camera_widgets_camera_view_change_camera (CameraView.vala:189)
==6350==    by 0x4A6C80F: g_list_foreach (glist.c:1092)
==6350==    by 0x1158E2: UnknownInlinedFun (CameraView.vala:162)
==6350==    by 0x1158E2: camera_main_window_constructor (MainWindow.vala:113)
==6350==    by 0x49DAA4B: g_object_new_with_custom_constructor (gobject.c:2163)
==6350==    by 0x49DCD29: UnknownInlinedFun (gobject.c:2243)
==6350==    by 0x49DCD29: g_object_new_valist (gobject.c:2584)
==6350==    by 0x49DD55E: g_object_new (gobject.c:2057)
==6350==    by 0x110B1C: UnknownInlinedFun (MainWindow.vala:58)
==6350==    by 0x110B1C: UnknownInlinedFun (MainWindow.vala:57)
==6350==    by 0x110B1C: camera_application_real_activate (Application.vala:61)
==6350==    by 0x49E9E84: UnknownInlinedFun (gclosure.c:895)
==6350==    by 0x49E9E84: signal_emit_valist_unlocked (gsignal.c:3516)
==6350==    by 0x49E9F90: g_signal_emit_valist (gsignal.c:3355)
==6350==    by 0x49EA052: g_signal_emit (gsignal.c:3675)
==6350==  Address 0x500 is not stack'd, malloc'd or (recently) free'd
==6350== 
==6350== 
==6350== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==6350==  Access not within mapped region at address 0x500
==6350==    at 0x4FFCDF4: UnknownInlinedFun (gtkcontainer.c:1862)
==6350==    by 0x4FFCDF4: gtk_container_add (gtkcontainer.c:1856)
==6350==    by 0x112E05: camera_widgets_camera_view_create_pipeline (CameraView.vala:259)
==6350==    by 0x113FDD: camera_widgets_camera_view_change_camera (CameraView.vala:189)
==6350==    by 0x4A6C80F: g_list_foreach (glist.c:1092)
==6350==    by 0x1158E2: UnknownInlinedFun (CameraView.vala:162)
==6350==    by 0x1158E2: camera_main_window_constructor (MainWindow.vala:113)
==6350==    by 0x49DAA4B: g_object_new_with_custom_constructor (gobject.c:2163)
==6350==    by 0x49DCD29: UnknownInlinedFun (gobject.c:2243)
==6350==    by 0x49DCD29: g_object_new_valist (gobject.c:2584)
==6350==    by 0x49DD55E: g_object_new (gobject.c:2057)
==6350==    by 0x110B1C: UnknownInlinedFun (MainWindow.vala:58)
==6350==    by 0x110B1C: UnknownInlinedFun (MainWindow.vala:57)
==6350==    by 0x110B1C: camera_application_real_activate (Application.vala:61)
==6350==    by 0x49E9E84: UnknownInlinedFun (gclosure.c:895)
==6350==    by 0x49E9E84: signal_emit_valist_unlocked (gsignal.c:3516)
==6350==    by 0x49E9F90: g_signal_emit_valist (gsignal.c:3355)
==6350==    by 0x49EA052: g_signal_emit (gsignal.c:3675)
==6350==  If you believe this happened as a result of a stack
==6350==  overflow in your program's main thread (unlikely but
==6350==  possible), you can try to increase the size of the
==6350==  main thread stack using the --main-stacksize= flag.
==6350==  The main thread stack size used in this run was 8388608.
==6350== 
==6350== HEAP SUMMARY:
==6350==     in use at exit: 4,900,736 bytes in 51,336 blocks
==6350==   total heap usage: 403,787 allocs, 352,451 frees, 32,704,825 bytes allocated
==6350== 
==6350== LEAK SUMMARY:
==6350==    definitely lost: 49,176 bytes in 3 blocks
==6350==    indirectly lost: 72 bytes in 3 blocks
==6350==      possibly lost: 22,873 bytes in 288 blocks
==6350==    still reachable: 4,433,207 bytes in 48,414 blocks
==6350==         suppressed: 0 bytes in 0 blocks
==6350== Rerun with --leak-check=full to see details of leaked memory
==6350== 
==6350== Use --track-origins=yes to see where uninitialised values come from
==6350== For lists of detected and suppressed errors, rerun with: -s
==6350== ERROR SUMMARY: 17 errors from 4 contexts (suppressed: 0 from 0)
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