setting bssid in adhoc mode

[Paul B. Mahol]

On 9/26/08, John Hay <jhay at meraka.org.za> wrote:
> On Thu, Sep 25, 2008 at 08:59:37PM +0200, Paul B. Mahol wrote:
>> On 9/25/08, John Hay <jhay at meraka.org.za> wrote:
>> > On Thu, Sep 25, 2008 at 04:41:30PM +0200, Paul B. Mahol wrote:
>> >> On 9/22/08, John Hay <jhay at meraka.org.za> 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