linux-kernel - Re: WARNING: CPU: 1 PID: 2485 at drivers/net/wireless/intel/iwlwifi/pcie/trans.c:1752 iwl_trans_pcie_grab_nic

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Date:	Fri, 15 Apr 2016 04:16:02 +0000
From:	"Grumbach, Emmanuel" <emmanuel.grumbach@...el.com>
To:	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"bp@...en8.de" <bp@...en8.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linuxwifi <linuxwifi@...el.com>,
	"Dreyfuss, Haim" <haim.dreyfuss@...el.com>,
	"Coelho, Luciano" <luciano.coelho@...el.com>,
	"Berg, Johannes" <johannes.berg@...el.com>,
	"kvalo@...eaurora.org" <kvalo@...eaurora.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Sharon, Sara" <sara.sharon@...el.com>
Subject: Re: WARNING: CPU: 1 PID: 2485 at
 drivers/net/wireless/intel/iwlwifi/pcie/trans.c:1752
 iwl_trans_pcie_grab_nic_access+0x110/0x120 [iwlwifi]

On Fri, 2016-04-15 at 02:07 +0000, Borislav Petkov wrote:
> Hi,
> 
> so I'm seeing this when wlan0 tries to associate. On 4.6-rc2 + tip.
> After that, wifi is dead in the water. Anyone have a clue?
> 
> And 4.5 seems fine, I'm typing from it as we speak.
> ...

<snip>

> [  661.142657] ------------[ cut here ]------------
> [  661.142816] WARNING: CPU: 1 PID: 2485 at
> drivers/net/wireless/intel/iwlwifi/pcie/trans.c:1752
> iwl_trans_pcie_grab_nic_access+0x110/0x120 [iwlwifi]
> [  661.143231] Timeout waiting for hardware access (CSR_GP_CNTRL
> 0xffffffff)
> 

This means that we have an electrical issue that prevents us from
accessing the device over the PCI bus. BAR has been garbaged or alike.
Every time I tried to debug that from the driver side it has ...
failed. Because the "good" in the end did exhibit the problem. So,
unless you are ready to embark for a bisection journey (and hope that
this time when you type 'git bisect good' it is really 'good'), I can't
do much.
What I can suggest is to install our latest backport based tree on 4.5.
This will allow you to have an easily bisectable tree. But it might
very well be that 4.5 + latest driver (equivalent to 4.6 as far as
iwlwifi is concerned) will be fine.
The backport tree is here [1]. Unfortunately, that's the only thing I
can suggest for now.

[1] https://git.kernel.org/cgit/linux/kernel/git/iwlwifi/backport-iwlwi
fi.git/
> -- 
> Regards/Gruss,
>     Boris.
> 
> ECO tip #101: Trim your mails when you reply. Srsly.