This seems to be an old bug, which is also mentioned elsewhere:
https://unix.stackexchange.com/questions/26126/spoofed-mac-address-ignored-by-wpa-supplicant
https://bugs.launchpad.net/neutron/+bug/1193972
Another symptom of this bug is probably inability to connect if you need
the changed MAC address to successfully authenticate.
As a workaround, use:
pre-up ifconfig wlan0 hw ether xx:xx:xx:xx:xx:xx
Instead of:
hwaddress ether xx:xx:xx:xx:xx:xx
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https://bugs.launchpad.net/bugs/1647709
Title:
Can't connect to WiFi if setting MAC address, RTNETLINK answers:
Device or resource busy
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