Is "Wireless event: new AP ..." called when start wpa_supplicant?

[hong zhang]

List,

After traffic runs for 20 mins, I see multiple "Wireless event: new AP:...."
such as
wpa_supplicant( 5744): Wireless event: cmd=0x8b15 len=20

wpa_supplicant( 5744): Wireless event: new AP: 00:1e:13:84:29:33

Then disconnected after getting 
wpa_supplicant( 5744): Wireless event: new AP: 00:00:00:00:00:00


I trace the wpa_supplicant source codes, see call trace is 
wpa_driver_wext_init()==>wpa_driver_wext_event_receive()==>wpa_driver_wext_event_rtm_newlink()==>wpa_driver_wext_event_wireless()==> "new AP: ....".

Does it means it has second wpa_supplicant is executed? But "ps -A" does not show second wpa_supplicant.

Any help will be appreciated.

---henry