From owner-freebsd-mobile@FreeBSD.ORG Fri Sep 26 17:55:10 2008 Return-Path: Delivered-To: freebsd-mobile@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 2527E106568C for ; Fri, 26 Sep 2008 17:55:10 +0000 (UTC) (envelope-from sam@freebsd.org) Received: from ebb.errno.com (ebb.errno.com [69.12.149.25]) by mx1.freebsd.org (Postfix) with ESMTP id CC7198FC20 for ; Fri, 26 Sep 2008 17:55:09 +0000 (UTC) (envelope-from sam@freebsd.org) Received: from trouble.errno.com (trouble.errno.com [10.0.0.248]) (authenticated bits=0) by ebb.errno.com (8.13.6/8.12.6) with ESMTP id m8QHt7xq094315 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 26 Sep 2008 10:55:09 -0700 (PDT) (envelope-from sam@freebsd.org) Message-ID: <48DD21FB.6060300@freebsd.org> Date: Fri, 26 Sep 2008 10:55:07 -0700 From: Sam Leffler Organization: FreeBSD Project User-Agent: Thunderbird 2.0.0.9 (X11/20071125) MIME-Version: 1.0 To: "Paul B. Mahol" References: <20080922132500.GA25677@zibbi.meraka.csir.co.za> <3a142e750809250741j7b9003e4q539618d1c9407def@mail.gmail.com> <20080925161338.GA69284@zibbi.meraka.csir.co.za> <3a142e750809251159p3f5f3bam11243b3f144859c2@mail.gmail.com> <20080926055522.GA13842@zibbi.meraka.csir.co.za> <3a142e750809261012r73e33b43w5996fa2f61dabd82@mail.gmail.com> In-Reply-To: <3a142e750809261012r73e33b43w5996fa2f61dabd82@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-DCC--Metrics: ebb.errno.com; whitelist Cc: freebsd-mobile@freebsd.org Subject: Re: setting bssid in adhoc mode X-BeenThere: freebsd-mobile@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Mobile computing with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Sep 2008 17:55:10 -0000 Paul B. Mahol wrote: > On 9/26/08, John Hay wrote: > >> On Thu, Sep 25, 2008 at 08:59:37PM +0200, Paul B. Mahol wrote: >> >>> On 9/25/08, John Hay wrote: >>> >>>> On Thu, Sep 25, 2008 at 04:41:30PM +0200, Paul B. Mahol wrote: >>>> >>>>> On 9/22/08, John Hay wrote: >>>>> >>>>>> Hi >>>>>> >>>>>> I'm trying out the new ath/wlan stuff in current. Should one still be >>>>>> able to set the bssid in adhoc mode? We normally lock the bssid in >>>>>> an adhoc network because of problems that the network split and does >>>>>> not merge, if you do not do it. >>>>>> >>>>>> What I have done is this: >>>>>> >>>>>> # ifconfig wlan0 create wlandev ath0 wlanmode adhoc >>>>>> # ifconfig wlan0 ssid ptamesh up >>>>>> >>>>>> Up to here works well. It will scan and if it finds another node with >>>>>> the >>>>>> same ssid, it will "lock" on that channel and use the correct bssid. >>>>>> >>>>>> If it does not find another node with the same ssid, it will start it >>>>>> own thing on channel 10. But it looks like one cannot set the bssid. >>>>>> >>>>>> # ifconfig wlan0 bssid 02:07:ca:fe:ba:be >>>>>> ifconfig: 02:07:ca:fe:ba:be: bad value >>>>>> >>>>> I had similar experience with STA mode, instead I use ap (ap is alias >>>>> for bssid, at least it works in STA mode) >>>>> I never bothered is this bug in manual page, ifconfig or in something >>>>> else >>>>> ... >>>>> >>>> Ah, thanks yes, "ifconfig wlan0 ap 02:07:ca:fe:ba:be" works just fine. >>>> Just do not try to unset it with "ifconfig wlan0 ap -". That is an >>>> alias for "panic now" :-) >>>> >>> Well, on my system it doesnt panic here. >>> So more info to debug "your" panic is required ... >>> >> I'll have to see if I can reproduce it. >> > > I managed to reproduce panic on recent CURRENT, with two cards in adhoc mode. > rum0 (usb2) & ndis0 (personal hacked version without usb code) > > I typed "ifconfig wlan0 ap -" several times. > > > bt: > > db:0:kdb.enter.unknown> run lockinfo > db:1:lockinfo> show locks > db:1:locks> show alllocks > Process 1471 (ifconfig) thread 0xc4028690 (100048) > Process 477 (syslogd) thread 0xc402b8c0 (100058) > db:1:alllocks> show lockedvnods > Locked vnodes > db:0:kdb.enter.unknown> show pcpu > cpuid = 1 > curthread = 0xc4028690: pid 1471 "ifconfig" > curpcb = 0xe64e1d90 > fpcurthread = none > idlethread = 0xc3cb1d20: pid 10 "idle: cpu1" > APIC ID = 1 > currentldt = 0x50 > spin locks held: > db:0:kdb.enter.unknown> bt > Tracing pid 1471 tid 100048 td 0xc4028690 > ieee80211_ht_adjust_channel(c46a8000,0,2,2,80000002,...) at > ieee80211_ht_adjust_channel+0x30 > adhoc_pick_bss(c4053000,c4113800,c0a1ebc3,23a,c3dd0108,...) at > adhoc_pick_bss+0x100 > ieee80211_check_scan(c4113800,2,7fffffff,0,0,...) at ieee80211_check_scan+0x20d > ieee80211_check_scan_current(c4113800,4,c0a1fb47,6c,c4113800,...) at > ieee80211_check_scan_current+0x45 > adhoc_newstate(c4113800,1,0,648,e64e1aa0,...) at adhoc_newstate+0x219 > ieee80211_new_state_locked(c4113800,0,c0a1e64c,49c,0,...) at > ieee80211_new_state_locked+0xc4 > ieee80211_init(c4113800,c0a24a64,6,c41adc00,1b9,...) at ieee80211_init+0x45 > ieee80211_ioctl_set80211(c3e1ec00,801c69ea,c48c4240,c0709084,c4028690,...) > at ieee80211_ioctl_set80211+0xe5 > in_control(c4158188,801c69ea,c48c4240,c3e1ec00,c4028690,...) at in_control+0xdc4 > ifioctl(c4158188,801c69ea,c48c4240,c4028690,801c69ea,...) at ifioctl+0x34a > soo_ioctl(c43c9d90,801c69ea,c48c4240,c41adc00,c4028690,...) at soo_ioctl+0x397 > kern_ioctl(c4028690,3,801c69ea,c48c4240,504110,...) at kern_ioctl+0x1dd > ioctl(c4028690,e64e1cf8,c,c06d3f58,c0702bf0,...) at ioctl+0x134 > syscall(e64e1d38) at syscall+0x283 > Xint0x80_syscall() at Xint0x80_syscall+0x20 > --- syscall (54, FreeBSD ELF32, ioctl), eip = 0x281a9a43, esp = > 0xbfbfe48c, ebp = 0xbfbfe4d8 --- > > here is panic message: > > Fatal trap 12: page fault while in kernel mode > cpuid = 1; apic id = 01 > fault virtual address = 0x0 > fault code = supervisor read, page not present > instruction pointer = 0x20:0xc0a0c5b0 > stack pointer = 0x28:0xe64e1980 > frame pointer = 0x28:0xe64e1990 > code segment = base 0x0, limit 0xfffff, type 0x1b > = DPL 0, pres 1, def32 1, gran 1 > processor eflags = interrupt enabled, resume, IOPL = 0 > current process = 1471 (ifconfig) > exclusive sleep mutex ndis0_com_lock (ndis0_com_lock) r = 1 > (0xc46a8014) locked @ > /usr/src/sys/modules/wlan/../../net80211/ieee80211_scan.c:570 > exclusive sleep mutex ndis0_com_lock (ndis0_com_lock) r = 1 > (0xc46a8014) locked @ > /usr/src/sys/modules/wlan/../../net80211/ieee80211_scan.c:570 > exclusive lockmgr bufwait (bufwait) r = 0 (0xd7d083c0) locked @ > /usr/src/sys/kern/vfs_bio.c:2443 > exclusive lockmgr ufs (ufs) r = 0 (0xc41a2058) locked @ > /usr/src/sys/kern/vfs_vnops.c:593 > > 0xc41a2000: tag ufs, type VREG > usecount 1, writecount 1, refcount 4 mountedhere 0 > flags () > v_object 0xc413aaa8 ref 0 pages 7 > lock type ufs: EXCL by thread 0xc402b8c0 (pid 477) > > ino 164881, on dev ad4s1d > Looks like adhoc_pick_channel returned NULL which was unexpected. Don't have a quick fix but it's possible no channel may be selected so the code is wrong. I rarely touch adhoc mode so this stuff is lightly tested. Sam