linux-kernel - RE: [init_mac80211_hwsim] BUG: unable to handle kernel paging request at cd1aa02c

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Date:	Mon, 11 Nov 2013 13:23:25 +0000
From:	"Berg, Johannes" <johannes.berg@...el.com>
To:	"Wu, Fengguang" <fengguang.wu@...el.com>
CC:	Thomas Pedersen <thomas@...ybit.com>, Jouni Malinen <j@...fi>,
	"John W. Linville" <linville@...driver.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"Holtmann, Marcel" <marcel.holtmann@...el.com>
Subject: RE: [init_mac80211_hwsim] BUG: unable to handle kernel paging
 request at cd1aa02c

> [    5.543416] ieee80211 phy0: Failed to select rate control algorithm
> [    5.543993] ieee80211 phy0: Failed to initialize rate control algorithm
> [    5.556937] mac80211_hwsim: ieee80211_register_hw failed (-2)
> [    5.557669] BUG: unable to handle kernel paging request at cd1aa02c
> [    5.558381] IP: [<c09bd01b>] kobject_get+0x2b/0xb0
> [    5.558922] *pdpt = 0000000002c20001 *pde = 000000000fbfc067 *pte =
> 800000000d1aa060

Yeah this is a known bug in hwsim - if registration fails (here apparently because you have no rate scaling) then it crashes - the error path is broken. Luckily, this never actually happens in practice. I'm supposed to get some patches from Marcel which I think will (have to) fix this.

johannes
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