Why does networkmanager change device state to unavailable?

Using a Yocto distribution with NetworkManager and NetworkManager-nmcli installed, I am not able to have my wifi wlan0 device leaving the unavailable state. The error message I have is: device (wlan0): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external') My question is how could I know which program is managing the device? I uninstalled and removed all sysvinit scripts that could create the network device and still have the same issue. I narrowed it down to the fact that when NetworkManager is started, it creates the wlan0 device and then switches it to unavailable as explained above. This is my /etc/network/interfaces # /etc/network/interfaces -- configuration file for ifup(8), ifdown(8) # The loopback interface auto lo iface lo inet loopback This is my /etc/NetworkManager/NetworkManager.conf [main] plugins=keyfile,ifupdown rc-manager=symlink dns=dnsmasq [ifupdown] managed=true The /usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf [keyfile] unmanaged-devices=*,except:type:wifi From my (probably poor) understanding, all these seem fine. I do not get why the wlan0 is still in "unavailable"?? Any help would be greatly appreciated! Thanks **EDIT** Folowing @thaller suggestion, I enabled the trace level log Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6226] platform-linux: do-change-link: success changing link: success Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6227] platform: (wlan0) link: setting hardware address to 02:42:58:70:A1:F9 Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6231] platform-linux: do-request-link: 3 Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6231] platform-linux: event-notification: RTM_NEWLINK, flags 0, seq 0: 3: wlan0 mtu 1500 arp 1 wifi? not-init addrgenmode none addr 02:42:58:70:A1:F9 brd FF:FF:FF:FF: Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6232] platform: (wlan0) signal: link changed: 3: wlan0 mtu 1500 arp 1 wifi? init addrgenmode none addr 02:42:58:70:A1:F9 brd FF:FF:FF:FF:FF:FF driver rtl8821au rx:78, Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6233] platform-linux: event-notification: RTM_NEWLINK, flags 0, seq 19: 3: wlan0 mtu 1500 arp 1 wifi? not-init addrgenmode none addr 02:42:58:70:A1:F9 brd FF:FF:FF:FF Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6234] platform-linux: do-change-link: success changing link: success Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6234] device[8ad453a3b5b754fb] (wlan0): hw-addr: hardware address now 02:42:58:70:A1:F9 Mar 10 13:12:33 nclab-kol-2021 daemon.info NetworkManager: [1646917953.6240] device (wlan0): set-hw-addr: set MAC address to 02:42:58:70:A1:F9 (scanning) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6242] device[8ad453a3b5b754fb] (wlan0): bringing up device 3 Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6242] platform: (wlan0) link: setting up Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6243] platform-linux: link: change 3: flags: set 0x1/0x1 ([up] / [up]) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6244] platform-linux: do-request-link: 3 Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6245] platform-linux: event-notification: RTM_NEWLINK, flags 0, seq 0: 3: wlan0 mtu 1500 arp 1 wifi? not-init addrgenmode none addr 02:42:58:70:A1:F Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6245] platform: (wlan0) signal: link changed: 3: wlan0 mtu 1500 arp 1 wifi? init addrgenmode none addr 02:42:58:70:A1:F9 brd FF:FF:FF:FF:FF:FF drive Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6247] platform-linux: event-notification: RTM_NEWLINK, flags 0, seq 21: 3: wlan0 mtu 1500 arp 1 wifi? not-init addrgenmode none addr 02:42:58:70:A1: Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6247] platform-linux: do-change-link: success changing link: success Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6248] device[8ad453a3b5b754fb] (wlan0): ip4-config: update (commit=1, new-config=(nil)) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6248] device[8ad453a3b5b754fb] (wlan0): ip4-config: clear IP Config instance (/org/freedesktop/NetworkManager/IP4Config/1) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6253] dns-mgr: (device_ip_config_changed): queueing DNS updates (1) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6255] dns-mgr: (device_ip_config_changed): DNS configuration did not change Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6255] dns-mgr: (device_ip_config_changed): no DNS changes to commit (0) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6256] dbus-object[db112265116d3c2f]: unexport: "/org/freedesktop/NetworkManager/IP4Config/1" Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6258] device[8ad453a3b5b754fb] (wlan0): ip6-config: update (commit=1, new-config=(nil)) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6259] device[8ad453a3b5b754fb] (wlan0): ip6-config: clear IP Config instance (/org/freedesktop/NetworkManager/IP6Config/1) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6263] dns-mgr: (device_ip_config_changed): queueing DNS updates (1) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6265] dns-mgr: (device_ip_config_changed): DNS configuration did not change Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6265] dns-mgr: (device_ip_config_changed): no DNS changes to commit (0) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6266] dbus-object[5827083ac52f43c8]: unexport: "/org/freedesktop/NetworkManager/IP6Config/1" Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6285] supplicant: (wlan0): creating new supplicant interface Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6289] device[8ad453a3b5b754fb] (wlan0): add_pending_action (2): 'waiting-for-supplicant' Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6290] device[8ad453a3b5b754fb] (wlan0): device not yet available for transition to DISCONNECTED Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6313] device[8ad453a3b5b754fb] (wlan0): connectivity state changed from UNKNOWN to NONE Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6316] manager: connectivity checking indicates NONE Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6323] dispatcher: (2) dispatching action 'connectivity-change' Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6327] device[8ad453a3b5b754fb] (wlan0): connectivity state changed from UNKNOWN to NONE Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6335] device[8ad453a3b5b754fb] (wlan0): remove_pending_action (1): 'in-state-change' Mar 10 13:12:33 nclab-kol-2021 daemon.info nm-dispatcher: req:2 'connectivity-change': new request (0 scripts) Mar 10 13:12:33 nclab-kol-2021 daemon.debug nm-dispatcher: req:2 'connectivity-change': environment: CONNECTIVITY_STATE=NONE Mar 10 13:12:33 nclab-kol-2021 daemon.debug nm-dispatcher: req:2 'connectivity-change': environment: NM_DISPATCHER_ACTION=connectivity-change Mar 10 13:12:33 nclab-kol-2021 daemon.info nm-dispatcher: req:2 'connectivity-change': completed: no scripts Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6347] create NMVpnManager singleton (6588803e3521b96d) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6347] manager: creating virtual devices... Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6348] setting up local loopback Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6349] platform: (lo) link: setting up Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6349] platform-linux: link: change 1: flags: set 0x1/0x1 ([up] / [up]) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6350] platform-linux: do-request-link: 1 Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6352] platform-linux: event-notification: RTM_NEWLINK, flags 0, seq 23: 1: lo mtu 65536 arp 772 loopback? not-init addrgenmode eui64 addr 00:00:00:00:0 Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6353] ethtool: ETHTOOL_GDRVINFO, lo: failed: Operation not supported Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6354] platform-linux: do-change-link: success changing link: success Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6366] firewall: D-Bus name for firewalld has no owner (firewall stopped) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6370] dns-sd-resolved[93c36e7af7f93bfa]: D-Bus name for systemd-resolved has no owner Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6384] dispatcher: (1) succeeded but no scripts invoked Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6390] dispatcher: (2) succeeded but no scripts invoked Mar 10 13:12:33 nclab-kol-2021 daemon.info NetworkManager: [1646917953.6397] ovsdb: Could not connect: No such file or directory Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6398] ovsdb: disconnecting from ovsdb, retry 0 Mar 10 13:12:33 nclab-kol-2021 daemon.info NetworkManager: [1646917953.6399] supplicant: wpa_supplicant stopped Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6402] device[53bb033d9641aa44] (lo): ip4-config: update (commit=0, new-config=0xaaaaf2bb8130) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6402] dbus-object[e01a38d512fcba77]: export: "/org/freedesktop/NetworkManager/IP4Config/2" Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6408] device[53bb033d9641aa44] (lo): ip4-config: set IP Config instance (/org/freedesktop/NetworkManager/IP4Config/2) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6418] dns-mgr: (device_ip_config_changed): queueing DNS updates (1) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6420] dns-mgr: (device_ip_config_changed): DNS configuration did not change Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6420] dns-mgr: (device_ip_config_changed): no DNS changes to commit (0) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6422] platform-linux: sysctl: reading '/proc/sys/net/ipv6/conf/lo/disable_ipv6': '0' Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6423] device[53bb033d9641aa44] (lo): ip6-config: update (commit=0, new-config=0xaaaaf2b9f370) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6424] dbus-object[d1948f7b92c13977]: export: "/org/freedesktop/NetworkManager/IP6Config/2" Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6429] device[53bb033d9641aa44] (lo): ip6-config: set IP Config instance (/org/freedesktop/NetworkManager/IP6Config/2) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6434] dns-mgr: (device_ip_config_changed): queueing DNS updates (1) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6436] dns-mgr: (device_ip_config_changed): DNS configuration did not change Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6436] dns-mgr: (device_ip_config_changed): no DNS changes to commit (0) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6437] device[c503cba53b9e71c5] (sit0): ip4-config: update (commit=0, new-config=0xaaaaf2bb84c0) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6438] dbus-object[db112265116d3c2f]: export: "/org/freedesktop/NetworkManager/IP4Config/3" Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6443] device[c503cba53b9e71c5] (sit0): ip4-config: set IP Config instance (/org/freedesktop/NetworkManager/IP4Config/3) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6448] dns-mgr: (device_ip_config_changed): queueing DNS updates (1) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6450] dns-mgr: (device_ip_config_changed): DNS configuration did not change Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6450] dns-mgr: (device_ip_config_changed): no DNS changes to commit (0) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6452] platform-linux: sysctl: reading '/proc/sys/net/ipv6/conf/sit0/disable_ipv6': '0' Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6453] device[c503cba53b9e71c5] (sit0): ip6-config: update (commit=0, new-config=0xaaaaf2b9f7b0) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6453] dbus-object[2c07d4e5110af889]: export: "/org/freedesktop/NetworkManager/IP6Config/3" Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6457] device[c503cba53b9e71c5] (sit0): ip6-config: set IP Config instance (/org/freedesktop/NetworkManager/IP6Config/3) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6463] dns-mgr: (device_ip_config_changed): queueing DNS updates (1) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6464] dns-mgr: (device_ip_config_changed): DNS configuration did not change Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6465] dns-mgr: (device_ip_config_changed): no DNS changes to commit (0) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6466] device[c1055a26277ac48d] (usb0): ip4-config: update (commit=0, new-config=0xaaaaf2bb85f0) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6467] dbus-object[9d6eaa32c97d075e]: export: "/org/freedesktop/NetworkManager/IP4Config/4" Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6472] device[c1055a26277ac48d] (usb0): ip4-config: set IP Config instance (/org/freedesktop/NetworkManager/IP4Config/4) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6483] dns-mgr: (device_ip_config_changed): queueing DNS updates (1) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6485] dns-mgr: (device_ip_config_changed): DNS configuration did not change Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6485] dns-mgr: (device_ip_config_changed): no DNS changes to commit (0) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6487] platform-linux: sysctl: reading '/proc/sys/net/ipv6/conf/usb0/disable_ipv6': '0' Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6488] device[c1055a26277ac48d] (usb0): ip6-config: update (commit=0, new-config=0xaaaaf2b9fae0) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6489] dbus-object[f2d73358dc9003e5]: export: "/org/freedesktop/NetworkManager/IP6Config/4" Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6495] device[c1055a26277ac48d] (usb0): ip6-config: set IP Config instance (/org/freedesktop/NetworkManager/IP6Config/4) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6501] dns-mgr: (device_ip_config_changed): queueing DNS updates (1) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6502] dns-mgr: (device_ip_config_changed): DNS configuration did not change Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6503] dns-mgr: (device_ip_config_changed): no DNS changes to commit (0) Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6506] manager: (lo): assume: don't assume because not managed Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6507] manager: (sit0): assume: don't assume because not managed Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6507] manager: (usb0): assume: don't assume because not managed Mar 10 13:12:33 nclab-kol-2021 daemon.debug NetworkManager: [1646917953.6508] manager: startup complete is waiting for device 'wlan0' (waiting-for-supplicant) I do not know what really to do with it. It seems that the network manager is creating the device than...