deauth problem

[c t]

Hello.
I'm using hostapd on PowerPC Embedded board.
Kernel version is 2.6.27, and hostapd version is v0.6.9.
Wireless chip is Atheros AR9160-BC1E , and using compat-wireless-2009-01-26.

AP starts fine , but station always deauthed from AP
in 5 seconds , after completed connecting to AP.

Does anyone have same situation or solution ?
Can I solve this problem  on changing hostap.conf ?

hostap.conf
########################
interface=wlan0
driver=nl80211
hw_mode=g
ssid=aa001122
channel=3
ieee80211n=1
########################


Part of debug output
########################
mgmt::auth
authentication: STA=00:90:cc:fa:da:db auth_alg=0 auth_transaction=1
status_code=0 wep=0
wlan0: STA 00:90:cc:fa:da:db IEEE 802.11: authentication OK (open system)
wlan0: STA 00:90:cc:fa:da:db MLME:
MLME-AUTHENTICATE.indication(00:90:cc:fa:da:db, OPEN_SYSTEM)
wlan0: STA 00:90:cc:fa:da:db MLME: MLME-DELETEKEYS.request(00:90:cc:fa:da:db)
authentication reply: STA=00:90:cc:fa:da:db auth_alg=0
auth_transaction=2 resp=0 (IE len=0)
MGMT (TX callback) fail
mgmt::proberesp cb
MGMT (TX callback) fail
mgmt::proberesp cb
MGMT (TX callback) fail
mgmt::proberesp cb
MGMT (TX callback) fail
mgmt::proberesp cb
MGMT (TX callback) fail
mgmt::proberesp cb
eth0: link down
MGMT
mgmt::assoc_req
association request: STA=00:90:cc:fa:da:db capab_info=0x501 listen_interval=5
handle_assoc STA 00:90:cc:fa:da:db - no HT, num of non-HT stations 1
hostapd_ht_operation_update current operation mode=0x13
hostapd_ht_operation_update new operation mode=0x13 changes=0
  old AID 1
wlan0: STA 00:90:cc:fa:da:db IEEE 802.11: association OK (aid 1)
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
MGMT (TX callback) ACK
mgmt::auth cb
wlan0: STA 00:90:cc:fa:da:db IEEE 802.11: authenticated
eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
STA 00:90:cc:fa:da:db sent probe request for broadcast SSID
STA 00:90:cc:fa:da:db sent probe request for broadcast SSID
MGMT
mgmt::auth
authentication: STA=00:90:cc:fa:da:db auth_alg=0 auth_transaction=1
status_code=0 wep=0
wlan0: STA 00:90:cc:fa:da:db IEEE 802.11: authentication OK (open system)
wlan0: STA 00:90:cc:fa:da:db MLME:
MLME-AUTHENTICATE.indication(00:90:cc:fa:da:db, OPEN_SYSTEM)
wlan0: STA 00:90:cc:fa:da:db MLME: MLME-DELETEKEYS.request(00:90:cc:fa:da:db)
authentication reply: STA=00:90:cc:fa:da:db auth_alg=0
auth_transaction=2 resp=0 (IE len=0)
MGMT (TX callback) ACK
mgmt::assoc_resp cb
wlan0: STA 00:90:cc:fa:da:db IEEE 802.11: associated (aid 1)
wlan0: STA 00:90:cc:fa:da:db MLME: MLME-ASSOCIATE.indication(00:90:cc:fa:da:db)
wlan0: STA 00:90:cc:fa:da:db MLME: MLME-DELETEKEYS.request(00:90:cc:fa:da:db)
wlan0: STA 00:90:cc:fa:da:db RADIUS: starting accounting session
0000001D-00000000
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) fail
mgmt::proberesp cb
MGMT (TX callback) fail
mgmt::proberesp cb
eth0: link down
MGMT
mgmt::assoc_req
association request: STA=00:90:cc:fa:da:db capab_info=0x501 listen_interval=5
handle_assoc STA 00:90:cc:fa:da:db - no HT, num of non-HT stations 1
hostapd_ht_operation_update current operation mode=0x13
hostapd_ht_operation_update new operation mode=0x13 changes=0
  old AID 1
wlan0: STA 00:90:cc:fa:da:db IEEE 802.11: association OK (aid 1)
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
MGMT
mgmt::deauth
deauthentication: STA=00:90:cc:fa:da:db reason_code=0
wlan0: STA 00:90:cc:fa:da:db IEEE 802.11: deauthenticated
wlan0: STA 00:90:cc:fa:da:db MLME:
MLME-DEAUTHENTICATE.indication(00:90:cc:fa:da:db, 0)
wlan0: STA 00:90:cc:fa:da:db MLME: MLME-DELETEKEYS.request(00:90:cc:fa:da:db)
hostapd_ht_operation_update current operation mode=0x13
hostapd_ht_operation_update new operation mode=0x0 changes=2
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT (TX callback) ACK
mgmt::proberesp cb
0.eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:22:fb:5f:22:84 sent probe request for broadcast SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:22:fb:5f:22:84 sent probe request for broadcast SSID
STA 00:22:fb:5f:22:84 sent probe request for broadcast SSID
STA 00:22:fb:5f:22:84 sent probe request for broadcast SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for broadcast SSID
STA 00:90:cc:fa:da:db sent probe request for broadcast SSID
STA 00:90:cc:fa:da:db sent probe request for broadcast SSID
STA 00:90:cc:fa:da:db sent probe request for broadcast SSID
STA 00:90:cc:fa:da:db sent probe request for broadcast SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
STA 00:90:cc:fa:da:db sent probe request for our SSID
MGMT (TX callback) ACK
mgmt::assoc_resp cb
handle_assoc_cb: STA 00:90:cc:fa:da:db not found
MGMT (TX callback) ACK
mgmt::proberesp cb