I am seeing similar symptoms as Michael Leun, using NetworkManager and ath9k
built-in (not as a module):
Apr 5 20:09:14 mithril NetworkManager[2575]: <info> (wlan0): supplicant
connection state:
scanning -> associating
Apr 5 20:09:15 mithril kernel: wlan0: authenticate with xxx (try 1)
Apr 5 20:09:15 mithril kernel: wlan0: authenticate with xxx (try 2)
Apr 5 20:09:15 mithril kernel: wlan0: authenticate with xxx (try 3)
Apr 5 20:09:15 mithril kernel: wlan0: authentication with xxx timed out
Apr 5 20:09:17 mithril NetworkManager[2575]: <warn> (wlan0): link timed out.
Apr 5 20:09:25 mithril NetworkManager[2575]: <info> (wlan0): supplicant
connection state:
associating -> disconnected
Apr 5 20:09:25 mithril NetworkManager[2575]: <info> (wlan0): supplicant
connection state:
disconnected -> scanning
Apr 5 20:09:25 mithril kernel: ath: Failed to stop TX DMA, queues=0x001!
Reproducible 100% of the time. Reverting
db6a6a78d8602964c9dfb1d8ce18daefd92da0a7 fixes the problem.
Hope that helps,
Ortwin