Re: Trying to understand a kernel error

[Dan Williams <dcbw redhat com>]

On Mon, 2011-10-24 at 10:39 -0400, Bill C Riemers wrote:
> Last night, I tried using wifi from the comfortinn I am staying at for the week, and I repeatedly received a kernel error:
> 
> :WARNING: at drivers/net/wireless/iwlwifi/iwl-core.c:482 iwl_check_rxon_cmd+0x21
> 1/0x21f [iwlagn]()
> 
> Actually, looking at the respective line of code, it seems the module is complaining that channel number 6 is not a valid channel number...

Probably best to persue this via kernel development lists actually, it's
probably more of a kernel driver bug than an NM bug.  But some things
that come to mind: perhaps the AP's 802.11d IE is telling your card that
it cannot use some channels; often APs get this wrong.  Second, if this
happens generally, it could be rfkill related.  But actually, your
problem is apparently this block:

	if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK))
			== (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) {
		IWL_WARN(priv, "CCK and short slot\n");
		errors |= BIT(7);
	}

which is much more a kernel driver issue than an NM issue...  (0x40 = bit 7)

Dan

> Now here are the problems related to network manager:
>    1. I have no way of aborting the connection attempt.  In fact now when I'm in the hotel I have to have the wifi switched off otherwise it automatically tries to connect to comfortinn, and generates the error repeatedly, blocking me from doing anything else.
>    2. I'm not sure if the problem is a kernel bug, or network manager is passing invalid parameters.   There seems to be no way to open the connection in with the gnome interface to network manager.  I can only open the connection options for connections I'm actively connected to.   Is there a file on disk somewhere I can access, or an alternate UI?
> 
> BTW. This problem seems related to the settings used for comfort inn, as I have never had problems connecting to any other wifi network.
> 
> Regards,
> 
> Bill
> 
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