KALI – How to fix ‘ioctl(SIOCSIWMODE) failed: Device or resource busy ‘ problem.
Airmon-ng and airodump-ng may fix to one channel and refuse to return to the default channel hopping mode.
ioctl(SIOSCISWMODE) failed: Device or resource busy
sudo ifconfig wlan2 down
sudo iwconfig wlan2 mode monitor
sudo ifconfig wlan2 up
sudo iwconfig wlan2
Now Check your work:
Airodump will now channel hop to find new basestations, rather than being fixed to one channel.