[PC-BSD Dev] PC-BSD 8.x WiFi kernel panic issues on Pentium-M

Kris Moore kris at pcbsd.org
Mon Jan 31 10:55:10 PST 2011


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On 01/29/2011 13:48, Rick wrote:
> On 2011/01/26 9:31, Kris Moore wrote:
>> On 01/26/2011 12:25, Rick wrote:
>>> On 2011/01/26 8:53, Kris Moore wrote:
>>>> On 01/24/2011 19:44, Rick wrote:
>>>>> I'm having a wifi issue very similar to the one reported here:
>>>>> http://lists.pcbsd.org/pipermail/testing/2011-January/004809.html
>>>>
>>>>> A short time after enabling wireless networking, the system panics and
>>>>> reboots.  Each time rc.conf is wiped out.
>>>>> I've tried i386 PC-BSD 8.1 and 8.2-RC2 and have this problem on two
>>>>> similar laptops: Dell D610 and HP nc6000.  Both laptops are Pentium-M
>>>>> class, 1GB RAM, mini-PCI.  I have tried an Intel NIC, Broadcom
>> NIC, and
>>>>> Ralink NIC with the same results.
>>>>
>>>>> Is this a known-issue?  Is there something I can do to help
>> troubleshoot
>>>>> this problem?
>>>>
>>>>> Thanks,
>>>>> Rick
>>>>
>>>> This is a known problem in the 8.x series, for whatever reason
>>>> restarting the wireless networking sometimes causes a kernel panic, and
>>>> any stuff not synced to disk is lost. FWIW it seems to be fixed/better
>>>> on 9.
>>>>
>>> _______________________________________________
>>> Dev mailing list
>>> Dev at lists.pcbsd.org
>>> http://lists.pcbsd.org/mailman/listinfo/dev
>>
>>
>>
>>> I'll grab a 9-current snapshot and give it a try.  I haven't had this
>>> problem with 8.x before, though, and it happens when turning wireless
>>> networking on for the first time as well as restarting.
>>
>>> Also this happens every time on these two laptops--it's not an
>>> intermittent problem.
>>
>>> Thanks,
>>> Rick
>>
>> On my systems here, its kinda hit-n-miss.
>>
>> A way to confirm this problem is to try simply running "/etc/rc.d/netif
>> restart" from the console. Do you see a kernel panic happen shortly
>> after that?
>>
>> If so, what wifi chipset do you have? It may be worth reporting this to
>> the FreeBSD PR system.
>>
>> http://www.freebsd.org/send-pr.html
>>
>>
> 
> I've done some more testing and research.  I've tried this with Atheros,
> Ralink, Intel, and Broadcom chipsets and also three different
> laptops.  running netif restart from a PC-BSD terminal window will cause
> the panic.  Booting to single user mode, however, everything works
> fine.  It turns out that the problem only happens when devd is also
> running.  Devd in turn is calling pccard_ether.  So I tried booting into
> single user mode, do mount -a, and call pccard_ether twice without
> loading devd and sure enough, that causes the panic quite reliably.
> After doing some more research, I came across a PR and some good
> discussion about this topic:
> 
> http://forum.nginx.org/read.php?23,79546
> http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/144755    <-- Best info
> http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/137776
> 
> To summarize:
> "Can you check if wpa_supplicant gets started twice after
> "/etc/rc.d/netif restart"?
> 
> I have the feeling that this is a more or less known issue, a race
> between devd (/etc/pccard_ether) and /etc/rc.d/netif. There is a small
> window (a few ms) where this can happen and our net80211 isn't capable
> of handling two running wpa_supplicants on the same interface. Which
> leads to all kind of weird issues, .e.g. panics."
> 
> "Please give the attached patch a try. It does not prevent
> wpa_supplicant from starting twice (for that you can define
> ctrl_interface= in wpa_supplicant.conf), but should no longer panic."
> 
> 
> Sure enough, I could see two copies of wpa_supplicant running on the
> same interface just before my kernel panic, so I decided to try adding
> the suggested option to wpa_supplicant.conf:
> 
> ctrl_interface=/var/run/wpa_supplicant
> 
> 
> This does prevent wpa_supplicant from being invoked twice and the kernel
> panics have stopped.
> 
> I'd like to patch wificonfigwidgetbase.cpp to stream this out to the top
> of wpa_supplicant.conf, but I'm not a QT developer and I'm having a hard
> time getting netmanager to compile.  Is there a quick rundown anywhere
> on building these sources?  I'm doing "qmake -spec freebsd-g++" and then
> "make" but it seems that some ui_dialog*.h files are missing.
> 
> Regards,
> Rick

Great investigative work!

I've added this "ctrl_interface=/var/run/wpa_supplicant" fix to our GUI
for 8.2/9, we'll see if that indeed fixes the kernel panics.

In the meantime, if you want to get a QT4 app to build, you can do so
with the following steps:

% qmake-qt4 *.pro
% make


- -- 
Kris Moore
PC-BSD Software
iXsystems
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