Description:
hostapd-0.6.10-1 is broken for me (ath9k). I confirmed it is a upstream bug (http://w1.fi/bugz/show_bug.cgi?id=344). hostapd-0.6.9-2 works fine.

Additional info:
* hostapd output
Configuration file: /etc/hostapd/hostapd.conf.bkp
ctrl_interface_group=0
Opening raw packet socket for ifindex -1216465354
BSS count 1, BSSID mask ff:ff:ff:ff:ff:ff (0 bits)
SIOCGIWRANGE: WE(compiled)=22 WE(source)=21 enc_capa=0xf
nl80211: Added 802.11b mode based on 802.11g information
RATE[0] rate=10 flags=0x2
RATE[1] rate=20 flags=0x6
RATE[2] rate=55 flags=0x6
RATE[3] rate=110 flags=0x6
RATE[4] rate=60 flags=0x0
RATE[5] rate=90 flags=0x0
RATE[6] rate=120 flags=0x0
RATE[7] rate=180 flags=0x0
RATE[8] rate=240 flags=0x0
RATE[9] rate=360 flags=0x0
RATE[10] rate=480 flags=0x0
RATE[11] rate=540 flags=0x0
Passive scanning not supported
Mode: IEEE 802.11g Channel: 1 Frequency: 2412 MHz
Flushing old station entries
Deauthenticate all stations
Using interface wlan0 with hwaddr 00:24:23:09:1f:f4 and ssid 'XXXXXXXXXX'
SSID - hexdump_ascii(len=9):
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx XXXXXXXXXX
PSK (ASCII passphrase) - hexdump_ascii(len=13):
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxx
PSK (from passphrase) - hexdump(len=32): xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Could not set DTIM period for kernel driver
wlan0: Unable to setup interface.
rmdir[ctrl_interface]: No such file or directory