Object NM.ActiveConnection (0x560dd5e44d80), has been already deallocated
With GNOME Shell 3.30.2, NetworkManager for whatever reason could not connect to a wireless network. The icon in the panel was then still shown, despite deactivating the WiFi connection, and in the journal the errors below were logged.
Jan 13 15:58:09 ersatz wpa_supplicant[430]: nl80211: Failed to set IPv4 unicast in multicast filter
Jan 13 15:58:09 ersatz wpa_supplicant[430]: rfkill: WLAN hard blocked
Jan 13 15:58:09 ersatz wpa_supplicant[430]: rfkill: WLAN hard blocked
Jan 13 15:58:09 ersatz wpa_supplicant[430]: nl80211: Failed to open /proc/sys/net/ipv4/conf/p2p-dev-wlp2s0/drop_unicast_in_l2_multicast: No such file
Jan 13 15:58:09 ersatz wpa_supplicant[430]: nl80211: Failed to set IPv4 unicast in multicast filter
Jan 13 15:58:09 ersatz wpa_supplicant[430]: nl80211: Failed to open /proc/sys/net/ipv4/conf/p2p-dev-wlp2s0/drop_unicast_in_l2_multicast: No such file
Jan 13 15:58:09 ersatz wpa_supplicant[430]: nl80211: Failed to set IPv4 unicast in multicast filter
Jan 13 15:58:09 ersatz wpa_supplicant[430]: nl80211: deinit ifname=p2p-dev-wlp2s0 disabled_11b_rates=0
Jan 13 15:58:09 ersatz NetworkManager[11519]: <info> [1547391489.8609] audit: op="radio-control" arg="wireless-enabled" pid=777 uid=5272 result="succ
Jan 13 15:58:09 ersatz NetworkManager[11519]: <info> [1547391489.8614] manager: rfkill: WiFi now disabled by radio killswitch
Jan 13 15:58:09 ersatz gnome-shell[777]: Object NM.ActiveConnection (0x560dd5e44d80), has been already deallocated — impossible to access it. This mig
Jan 13 15:58:09 ersatz org.gnome.Shell.desktop[777]: == Stack trace for context 0x560dd36eb1f0 ==
Jan 13 15:58:09 ersatz org.gnome.Shell.desktop[777]: #0 560dd4e32cc8 i resource:///org/gnome/gjs/modules/overrides/GObject.js:468 (7f48964cc040 @
Jan 13 15:58:09 ersatz org.gnome.Shell.desktop[777]: #1 560dd4e32c20 i resource:///org/gnome/shell/ui/status/network.js:1827 (7f4895fe8040 @ 111)
Jan 13 15:58:09 ersatz org.gnome.Shell.desktop[777]: #2 7ffd5a44a7f0 b resource:///org/gnome/gjs/modules/_legacy.js:82 (7f48964b0b80 @ 71)
Jan 13 15:58:09 ersatz org.gnome.Shell.desktop[777]: #3 7ffd5a44a8c0 b self-hosted:979 (7f48964f01f0 @ 440)
Jan 13 15:58:09 ersatz org.gnome.Shell.desktop[777]: == Stack trace for context 0x560dd36eb1f0 ==
Jan 13 15:58:09 ersatz org.gnome.Shell.desktop[777]: #0 560dd4e32ca0 i resource:///org/gnome/shell/ui/status/network.js:1996 (7f4895fe89d0 @ 47)
Jan 13 15:58:09 ersatz org.gnome.Shell.desktop[777]: #1 7ffd5a449870 b resource:///org/gnome/gjs/modules/_legacy.js:82 (7f48964b0b80 @ 71)
Jan 13 15:58:09 ersatz org.gnome.Shell.desktop[777]: #2 560dd4e32c20 i resource:///org/gnome/shell/ui/status/network.js:1947 (7f4895fe8700 @ 95)
Jan 13 15:58:09 ersatz org.gnome.Shell.desktop[777]: #3 7ffd5a44a7f0 b resource:///org/gnome/gjs/modules/_legacy.js:82 (7f48964b0b80 @ 71)
Jan 13 15:58:09 ersatz org.gnome.Shell.desktop[777]: #4 7ffd5a44a8c0 b self-hosted:979 (7f48964f01f0 @ 440)
Jan 13 15:58:09 ersatz gnome-shell[777]: Object NM.ActiveConnection (0x560dd5e44d80), has been already deallocated — impossible to get any property fr
Jan 13 15:58:09 ersatz wpa_supplicant[430]: nl80211: deinit ifname=wlp2s0 disabled_11b_rates=0