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Today's Topics:
1. Re: Panic in rt2x00lib (Helmut Schaa)
2. Re: Panic in rt2x00lib (Helmut Schaa)
3. Re: Panic in rt2x00lib (TJ)
----------------------------------------------------------------------
Message: 1
Date: Mon, 10 Dec 2012 08:58:36 +0100
From: Helmut Schaa <[email protected]>
To: TJ <[email protected]>
Cc: [email protected]
Subject: Re: [rt2x00-users] Panic in rt2x00lib
Message-ID:
<CAGXE3d8fNWakd=0ol1dfst2zog7oyq_azajuuqukugzcr95...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Him
On Sun, Dec 9, 2012 at 11:22 AM, TJ <[email protected]> wrote:
> Using Linksys WMP600N "05:01.0 Network controller [0280]: Ralink corp. RT2800
> 802.11n PCI [1814:0601]" with hostapd in 802.11n mode is causing
> unpredictable but guaranteed kernel panics. The panics
> occur when 802.11g (not n) devices are communicating. There's no guaranteed
> way to reproduce but eventually the panic will occur.
>
> Using Ubuntu 12.04 with kernel 3.2.0-34-generic on 32-bit Pentium 4 hardware
> originally, this also affects 3.7rc8 (3.7.0-030700rc8-generic Ubuntu mainline
> build).
Are you using compat-wireless for mac80211/rt2x00?
> I noticed a discussion in this list back in November 2010 that seems to
> describe the fault, as best as I can understand it, may be related to
> adjusting the packet padding when packet resends are required.
>
> http://rt2x00.serialmonkey.com/pipermail/users_rt2x00.serialmonkey.com/2010-November/002457.html
The patch in question didn't get in, so this must be something
different. Could you try to do a bisect
to find the commit introducing this crash?
Helmut
------------------------------
Message: 2
Date: Mon, 10 Dec 2012 09:17:52 +0100
From: Helmut Schaa <[email protected]>
To: TJ <[email protected]>
Cc: [email protected]
Subject: Re: [rt2x00-users] Panic in rt2x00lib
Message-ID:
<cagxe3d-l9jhpe0nhlgp9fpcqgxxutjr_9t+vlqhqfisiyto...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
On Mon, Dec 10, 2012 at 8:58 AM, Helmut Schaa
<[email protected]> wrote:
> Him
>
> On Sun, Dec 9, 2012 at 11:22 AM, TJ <[email protected]> wrote:
>> Using Linksys WMP600N "05:01.0 Network controller [0280]: Ralink corp.
>> RT2800 802.11n PCI [1814:0601]" with hostapd in 802.11n mode is causing
>> unpredictable but guaranteed kernel panics. The panics
>> occur when 802.11g (not n) devices are communicating. There's no guaranteed
>> way to reproduce but eventually the panic will occur.
>>
>> Using Ubuntu 12.04 with kernel 3.2.0-34-generic on 32-bit Pentium 4 hardware
>> originally, this also affects 3.7rc8 (3.7.0-030700rc8-generic Ubuntu
>> mainline build).
>
> Are you using compat-wireless for mac80211/rt2x00?
>
>> I noticed a discussion in this list back in November 2010 that seems to
>> describe the fault, as best as I can understand it, may be related to
>> adjusting the packet padding when packet resends are required.
>>
>> http://rt2x00.serialmonkey.com/pipermail/users_rt2x00.serialmonkey.com/2010-November/002457.html
>
> The patch in question didn't get in, so this must be something
> different. Could you try to do a bisect
> to find the commit introducing this crash?
Actually I just checked insert_l2_pad and remove_l2_pad. And it seems possible
that insert_l2_pad moves both, the header and the payload while remove_l2_pad
will only move the header. Hence, if the skb is resent by mac80211 after passing
a failed tx status of such a "header+data moved skb" it might happen
that we don't
have enough headroom in the skb anymore for the resend.
Mind to give [1] a try?
Thanks,
Helmut
[1]
https://github.com/mirrors/openwrt/blob/master/package/mac80211/patches/606-rt2x00_no_realign.patch
------------------------------
Message: 3
Date: Mon, 10 Dec 2012 18:19:02 +0000
From: TJ <[email protected]>
To: [email protected]
Subject: Re: [rt2x00-users] Panic in rt2x00lib
Message-ID: <[email protected]>
Content-Type: text/plain; charset=UTF-8
On 10/12/12 08:17, Helmut Schaa wrote:
>
> Actually I just checked insert_l2_pad and remove_l2_pad. And it seems possible
> that insert_l2_pad moves both, the header and the payload while remove_l2_pad
> will only move the header. Hence, if the skb is resent by mac80211 after
> passing
> a failed tx status of such a "header+data moved skb" it might happen
> that we don't
> have enough headroom in the skb anymore for the resend.
>
> Mind to give [1] a try?
>
> [1]
> https://github.com/mirrors/openwrt/blob/master/package/mac80211/patches/606-rt2x00_no_realign.patch
>
I shall do. It might be a few days until I get an opportunity since the
affected system is a primary gateway server.
> Are you using compat-wireless for mac80211/rt2x00?
It's using the main-line kernel modules (no Ubuntu -cw- packages installed):
$ modinfo rt2x00lib
filename:
/lib/modules/3.7.0-030700rc8-generic/kernel/drivers/net/wireless/rt2x00/rt2x00lib.ko
license: GPL
description: rt2x00 library
version: 2.3.0
author: http://rt2x00.serialmonkey.com
srcversion: 9939FEA8C39CF23244C5DE0
depends: mac80211,cfg80211
intree: Y
vermagic: 3.7.0-030700rc8-generic SMP mod_unload modversions 686
$ modinfo mac80211
filename:
/lib/modules/3.7.0-030700rc8-generic/kernel/net/mac80211/mac80211.ko
license: GPL
description: IEEE 802.11 subsystem
srcversion: A7530D5435D8711D00F7434
depends: cfg80211
intree: Y
vermagic: 3.7.0-030700rc8-generic SMP mod_unload modversions 686
parm: max_nullfunc_tries:Maximum nullfunc tx tries before
disconnecting (reason 4). (int)
parm: max_probe_tries:Maximum probe tries before disconnecting
(reason 4). (int)
parm: probe_wait_ms:Maximum time(ms) to wait for probe response
before disconnecting (reason 4). (int)
parm: ieee80211_default_rc_algo:Default rate control algorithm for
mac80211 to use (charp)
------------------------------
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