try "rfkill list" to list all radio devices, such as

$ rfkill list
0: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no
2: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no

run "rfkill block 2" to disable it, and "run kill unblock 2" to enable
it, assuming your wifi is also (2).

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https://bugs.launchpad.net/bugs/1872351

Title:
  Qualcomm Atheros QCA6174 Killer 1435 Wireless-AC: Disabling wifi
  causes kernel warning in __sta_info_destroy_part2

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