linux-kernel - Re: [crash] BUG: unable to handle kernel NULL pointer dereference at 0000000000000370

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Message-ID: <20080721193425.GA29287@elte.hu>
Date:	Mon, 21 Jul 2008 21:34:25 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	Ian Schram <ischram@...enet.be>,
	David Miller <davem@...emloft.net>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	wireless <linux-wireless@...r.kernel.org>, j@...fi
Subject: Re: [crash] BUG: unable to handle kernel NULL pointer dereference
	at 0000000000000370


* Larry Finger <Larry.Finger@...inger.net> wrote:

> Ingo Molnar wrote:
>> * Ian Schram <ischram@...enet.be> wrote:
>>
>>> I was looking at this out of interest, but I'm in no way familiar 
>>> with the code.
>>
>> thanks Ian for the patch, i'll test it.
>>
>> Note that it was whitespace damaged, find below a tidied up version of  
>> the patch that i've applied to tip/out-of-tree.
>>
>> 	Ingo
>
> This patch may be needed to fix error handling in the hw_sim code, but 
> I get the crash even with that code disabled. I'm currently bisecting 
> to find the culprit.

ok. I just reactivated CONFIG_MAC80211_HWSIM, applied Ian's fix and the 
crash went away:

 calling  iwl4965_init+0x0/0x6c
 iwl4965: Intel(R) Wireless WiFi Link 4965AGN driver for Linux, 1.3.27kd
 iwl4965: Copyright(c) 2003-2008 Intel Corporation
 initcall iwl4965_init+0x0/0x6c returned 0 after 10 msecs
 calling  init_mac80211_hwsim+0x0/0x31c
 mac80211_hwsim: Initializing radio 0
 PM: Adding info for No Bus:hwsim0
 PM: Adding info for No Bus:phy0
 PM: Adding info for No Bus:wmaster0
 phy0: Failed to select rate control algorithm
 phy0: Failed to initialize rate control algorithm
 PM: Removing info for No Bus:wmaster0
 PM: Removing info for No Bus:phy0
 mac80211_hwsim: ieee80211_register_hw failed (-2)
 PM: Removing info for No Bus:hwsim0
 initcall init_mac80211_hwsim+0x0/0x31c returned -2 after 58 msecs
 initcall init_mac80211_hwsim+0x0/0x31c returned with error code -2
 calling  dmfe_init_module+0x0/0xea
 dmfe: Davicom DM9xxx net driver, version 1.36.4 (2002-01-17)
 initcall dmfe_init_module+0x0/0xea returned 0 after 5 msecs

So at least as far as the init_mac80211_hwsim() deinit crash goes:

Tested-by: Ingo Molnar <mingo@...e.hu>

	Ingo
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