Date: Fri, 8 Oct 2010 15:20:08 +0000 From: Paul B Mahol <onemda@gmail.com> To: Alexey Dokuchaev <danfe@freebsd.org> Cc: Bernhard Schmidt <bschmidt@techwires.net>, net@freebsd.org Subject: Re: Monitor mode not working for iwi(4) on 7.X Message-ID: <AANLkTi=Tbromosm23qLoi2bKVCGB=AT6tX-90DNyB-Dv@mail.gmail.com> In-Reply-To: <20101008131849.GA54860@FreeBSD.org> References: <4763016D.7060100@janh.de> <20101006100335.GA26843@FreeBSD.org> <AANLkTimB4gRYYzO8UHAGHB9p0nEm5utvXTwWX%2Baypt5J@mail.gmail.com> <20101008131849.GA54860@FreeBSD.org>
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On 10/8/10, Alexey Dokuchaev <danfe@freebsd.org> wrote:
> On Thu, Oct 07, 2010 at 08:43:37PM +0200, Bernhard Schmidt wrote:
>> Try the attached patch, this is basically the code from stable/6
>> ported to head and stable/7. I did only some basic tests but monitor
>> mode seems to work and it is still possible to use the card in STA
>> mode.
>>
>> I'm not sure why that got lost, but there must be a reason I'm not
>> seeing right now. If someone has more knowledge about that, please
>> let me know, otherwise I intend to commit it this weekend.
>
> Unfortunately, I am getting instant panic when trying any of aircrack-ng
> suite utilities ("ifconfig iwi0 scan/list scan" works though):
>
> Fatal trap 12: page fault while in kernel mode
> fault virtual address = 0x0
> fault code = supervisor read, page not present
> instruction pointer = 0x20:0xc0768d42
> stack pointer = 0x28:0xe4112c80
> frame pointer = 0x28:0xe4112c98
> 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 = 35 (iwi0 taskq)
>
> (kgdb) bt
> ...
> #6 0xc060cae0 in trap_fatal (frame=0xe4112c40, eva=0)
> at /usr/src/sys/i386/i386/trap.c:941
> #7 0xc060cd90 in trap_pfault (frame=0xe4112c40, usermode=0, eva=0)
> at /usr/src/sys/i386/i386/trap.c:863
> #8 0xc060d7f7 in trap (frame=0xe4112c40) at
> /usr/src/sys/i386/i386/trap.c:541
> #9 0xc05f4d9b in calltrap () at /usr/src/sys/i386/i386/exception.s:166
> #10 0xc0768d42 in iwi_monitor_scan (arg=0xc3dcc000, npending=4)
> at /usr/src/sys/modules/iwi/../../dev/iwi/if_iwi.c:2744
> ...
> (kgdb) f 10
> #10 0xc0768d42 in iwi_monitor_scan (arg=0xc3dcc000, npending=4)
> at /usr/src/sys/modules/iwi/../../dev/iwi/if_iwi.c:2744
> 2744 struct iwi_softc *sc = ic->ic_ifp->if_softc;
> (kgdb) l
> 2739
> 2740 static void
> 2741 iwi_monitor_scan(void *arg, int npending)
> 2742 {
> 2743 struct ieee80211com *ic = arg;
> 2744 struct iwi_softc *sc = ic->ic_ifp->if_softc;
> 2745 IWI_LOCK_DECL;
> 2746
> 2747 IWI_LOCK(sc);
> 2748 (void) iwi_scanchan(sc, 2000, 0);
> (kgdb) p ((struct ieee80211com *)arg)->ic_ifp
> $1 = (struct ifnet *) 0x0
>
> Any suggestions?
7.X is buggy regarding tasqueue, I think (maybe it is net80211 bug and
not iwi fault).
Does it panic with tcpdump too?
Try to reproduce it on CURRENT.
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