hostpad failed when station active

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Hello list,

I am trying to enable software AP in linux along with wifi station. The compiled 4.4.13 kernel already provides the required drivers

~~~
#lsmod | grep 80211

mac80211    630784  1 ath9k
cfg80211      548864  4 ath,ath9k_common,ath9k,mac80211
~~~


No issue to start the AP alone with the minimal hostapd configuration

~~~
interface=sw_ap
driver=nl80211
ssid=test
channel=6
wmm_enabled=1
hw_mode=g
~~~

but failed when virtual station is already up. Then hostapd gives following errors

~~~
nl80211: send_mlme - da= ff:ff:ff:ff:ff:ff noack=0 freq=0 no_cck=0 offchanok=0 wait_time=0 fc=0xc0 (WLAN_FC_STYPE_DEAUTH) nlmode=3
nl80211: send_mlme -> send_frame
nl80211: send_frame - Use bss->freq=2412
nl80211: send_frame -> send_frame_cmd
nl80211: Frame command failed: ret=-16 (Device or resource busy) (freq=2412 wait=0)
~~~~

"iw list" suggests

```
    Supported interface modes:
         * IBSS
         * managed
         * AP
         * AP/VLAN
         * WDS
         * monitor
         * mesh point
         * P2P-client
         * P2P-GO
         * Unknown mode (11)
````

Have I missed anything ?
hostapd   version 2.3

regards,
Bob





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