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From: Krishna Chaitanya <chaitanya.mgit@gmail.com>
Date: Sat, 15 Mar 2014 21:03:54 +0530
Message-ID: <CABPxzYJXQR=t6u33uFT5dU2y6sKK1QhCbBn+t4TmmNfVhNk5gw@mail.gmail.com> (sfid-20140315_163437_281431_68E0432B)
Subject: Re: [mac80211_hwsim] BUG: unable to handle kernel paging request at ce1db404
To: Johannes Berg <johannes@sipsolutions.net>
Cc: Martin Pitt <martin.pitt@ubuntu.com>,
	Fengguang Wu <fengguang.wu@intel.com>,
	linux-wireless <linux-wireless@vger.kernel.org>,
	netdev <netdev@vger.kernel.org>, linux-kernel@vger.kernel.org
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Sender: linux-wireless-owner@vger.kernel.org

On Sat, Mar 15, 2014 at 8:50 PM, Johannes Berg
<johannes@sipsolutions.net> wrote:
>
> On Thu, 2014-03-13 at 02:15 +0530, Krishna Chaitanya wrote:
>
> > From the logs it looks like "rate_control_alloc" is failed,
> > causing ieee80211_register_hw to fail triggering the crash.
>
> Yes.
>
> > what RC are u using? Default should be minstrel, i dont see
> > a reason for rc alloc to fail (remote reason kmalloc failure),
> > so did you disable RC completely? No prints either w.r.t RC either in
> > dmesg?
>
> Pay attention to the .config.
>
Missed the attachment, thanks for pointing.
As guessed the rate control is empty causing the registration fail.

CONFIG_MAC80211=y
# CONFIG_MAC80211_RC_PID is not set
# CONFIG_MAC80211_RC_MINSTREL is not set
CONFIG_MAC80211_RC_DEFAULT=""