Update: I went to cell phone to see your crash image. An assertion in AR9003 chipset processing occurred because of invalid values on general purpose input/output ports.
The most recent update to this driver is in -current (after 5.2), and the patch log states:
Quote:
Fix hardware kill switch detection for the ar9300 chip family. The driver was checking the wrong bits of eeprom to determine rfkill switch pin and polarity, and was reading the wrong register to determine rfkill gpio pin state. ok kettenis@
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I recommend repairing your system from single user mode as I described above, then "upgrading" to a recent snapshot, and then trying to set your athn(4) NIC to AP mode again in -current.