linux-kernel - Re: WARNING: at net/mac80211/scan.c:267 ieee80211_scan

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Message-Id: <1253122055.26521.431.camel@rc-desk>
Date:	Wed, 16 Sep 2009 10:27:35 -0700
From:	reinette chatre <reinette.chatre@...el.com>
To:	Maciej Rutecki <maciej.rutecki@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Wireless List <linux-wireless@...r.kernel.org>,
	"ilw@...ux.intel.com" <ilw@...ux.intel.com>,
	"Zhu, Yi" <yi.zhu@...el.com>
Subject: Re: WARNING: at net/mac80211/scan.c:267
 ieee80211_scan_completed+0x299/0x2b0 	[mac80211]()

Hi Maciej,

> Steps to reproduce:
> 1. Connect to the wireless network (WPA2), it takes long time (longer
> than in 2.6.31)
> 2. Connect to another wireless network:
> 3. Connect fails with error:

The important information is not what you posted here, but still in the
dmesg file you provided. In that log we see the following right before
the warnings:

[  163.126590] wlan0: direct probe to AP 00:1b:11:f6:0f:28 (try 1)
[  163.130027] wlan0 direct probe responded
[  163.130032] wlan0: authenticate with AP 00:1b:11:f6:0f:28 (try 1)
[  163.131924] wlan0: authenticated
[  163.131952] wlan0: associate with AP 00:1b:11:f6:0f:28 (try 1)
[  163.134325] wlan0: RX ReassocResp from 00:1b:11:f6:0f:28 (capab=0x431 status=0 aid=1)
[  163.134331] wlan0: associated
[  163.155938] wlan0: deauthenticating by local choice (reason=3)

It shows that association was successful, but something in userspace requested a disconnect. 

> 
> [  163.208063] ------------[ cut here ]------------
> [  163.208114] WARNING: at net/mac80211/scan.c:267
> ieee80211_scan_completed+0x299/0x2b0 [mac80211]()

I cannot get an exact line match based on the kernel information you
provided. I assume it is the first warning in
ieee80211_scan_completed(). This is not serious as it indicates that
mac80211 received a "scan completed" indication when it was not
scanning. 


> [  163.232845] ------------[ cut here ]------------
> [  163.232908] WARNING: at net/wireless/core.c:613
> wdev_cleanup_work+0xbb/0xe0 [cfg80211]()

This warning has just been reported in linux-wireless also. Perhaps you
can follow its discussion there. See
http://thread.gmane.org/gmane.linux.kernel.wireless.general/39607

Reinette


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