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</o:shapelayout></xml><![endif]--></head><body lang=KO link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hi, all<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>On an embedded ARM system(with Kernel is 3.10) I have issues(segmentation fault) to remove P2P group interface. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>The test sequences are as follows:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>1. Run the wpa_supplicant daemon: wpa_supplicant -Dnl80211 -iwlan0 -c p2p.conf -u -dd<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>2. Create the P2P GO : wpa_cli -iwlan0 p2p_group_add <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>3. Remove P2P group interface : wpa_cli -iwlan0 p2p_group_remove p2p-wlan0-0<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Running wpa_supplicant I got:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>===============================================================================<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>...<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>dbus: fi.w1.wpa_supplicant1.Interface.P2PDevice.Disconnect (/fi/w1/wpa_supplicant1/Interfaces/3)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>wlan0: P2P-GROUP-REMOVED p2p-wlan0-0 GO reason=REQUESTED<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>dbus: Unregister group object '/fi/w1/wpa_supplicant1/Interfaces/3/Groups/QX'<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>P2P: Remove group interface p2p-wlan0-0<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>p2p-wlan0-0: Removing interface p2p-wlan0-0<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>p2p-wlan0-0: Request to deauthenticate - bssid=02:90:4c:c5:92:38 pending_bssid=00:00:00:00:00:00 reason=3 state=COMPLETED<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>wpa_driver_nl80211_disconnect(reason_code=3)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>p2p-wlan0-0: nl80211: MLME command failed: reason=3 ret=-95 (Operation not supported)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>p2p-wlan0-0: Event DEAUTH (12) received<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>p2p-wlan0-0: Deauthentication notification<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>p2p-wlan0-0: * reason 3 (locally generated)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Deauthentication frame IE(s) - hexdump(len=0): [NULL]<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>p2p-wlan0-0: Ignore deauth event in AP mode<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>p2p-wlan0-0: No keys have been configured - skip key clearing<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>p2p-wlan0-0: Flushing old station entries<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>p2p-wlan0-0: Deauthenticate all stations<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>¡¦<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>p2p-wlan0-0: State: COMPLETED -> DISCONNECTED<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>wpa_driver_nl80211_set_operstate: operstate 1->0 (DORMANT)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>netlink: Operstate: linkmode=-1, operstate=5<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>EAPOL: External notification - portEnabled=0<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>EAPOL: Supplicant port status: Unauthorized<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>EAPOL: External notification - portValid=0<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>EAPOL: Supplicant port status: Unauthorized<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>EAPOL: External notification - EAP success=0<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>EAPOL: Supplicant port status: Unauthorized<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>p2p-wlan0-0: No keys have been configured - skip key clearing<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>dbus: Unregister network object '/fi/w1/wpa_supplicant1/Interfaces/3/Networks/0'<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>dbus: wpa_dbus_unregister_object_per_iface: Could not obtain object's private data: /fi/w1/wpa_supplicant1/Interfaces/3/Networks/0<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Segmentation fault<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>============================================================================================<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I debugged it and I found the problem.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>It is to unregister Network's path which is not object path.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I can see the obect path related P2P after creating the P2P GO<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>- /fi/w1/wpa_supplicant1/Interfaces/3/<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>It is the object path related to p2p-wlan0-0 and /fi/w1/wpa_supplicant1/Interfaces/3/Networks/0 is not object path. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>In wpa_dbus_unregister_object_per_iface() in dbus_new_helper.c,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>===============================================================================================<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>...<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>if (!dbus_connection_unregister_object_path(con, path)) -> Segmentation fault point<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> return -1;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>...<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>================================================================================================<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Why do '/fi/w1/wpa_supplicant1/Interfaces/3/Networks/0' unregister ? <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>As I mention before, it is not object path.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>In x86 system(ubuntu 12.04), there are not segmentation fault and it works fine however I can see unknown message which is not created by wpa_supplicant as bellow:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>=================================================================================================<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>...<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>dbus: Unregister network object '/fi/w1/wpa_supplicant1/Interfaces/3/Networks/0'<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>dbus: wpa_dbus_unregister_object_per_iface: Could not obtain object's private data: /fi/w1/wpa_supplicant1/Interfaces/3/Networks/0<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Attempted to unregister path (path[0] = fi path[1] = w1) which isn't registered --> unknown message<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>p2p-wlan0-0: Cancelling scan request<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>p2p-wlan0-0: Cancelling authentication timeout<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>...<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>====================================================================================================<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I think if the value of path is not object path, it is not necessary to do dbus_connection_unregister_object_path(con, path).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I changed the source code and both system work fine.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>==================================================================================================================================<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>diff -urN A/wpa_supplicant/dbus/dbus_new_helpers.c B/wpa_supplicant/dbus/dbus_new_helpers.c<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>--- A/wpa_supplicant/dbus/dbus_new_helpers.c <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>+++ B/wpa_supplicant/dbus/dbus_new_helpers.c <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>@@ -590,6 +590,7 @@<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> if (!obj_desc) {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> wpa_printf(MSG_ERROR, "dbus: %s: Could not obtain object's "<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> "private data: %s", __func__, path);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>+ return 0;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> } else {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> eloop_cancel_timeout(flush_object_timeout_handler, con,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> obj_desc); <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>==================================================================================================================================<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I don't know exactly why dbus_connection_unregister_object_path(con, path) generates segmentation fault in my ARM system.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>However, I think if path is not object path, we don't need dbus_connection_unregister_object_path(con, path).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Is it a bug or do I make a mistake?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>It would be great if you can take a look at the patch and tell me what you think about it.<o:p></o:p></span></p><p class=MsoNormal><b><span lang=EN-US><o:p> </o:p></span></b></p><p class=MsoNormal><span lang=EN-US>BTW, I attached the patch file.<o:p></o:p></span></p><p class=MsoNormal><b><span lang=EN-US><o:p> </o:p></span></b></p><p class=MsoNormal><span lang=EN-US>Best Regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Sungho<o:p></o:p></span></p></div></body></html>