From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755615AbYGUTnr (ORCPT ); Mon, 21 Jul 2008 15:43:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753538AbYGUTnf (ORCPT ); Mon, 21 Jul 2008 15:43:35 -0400 Received: from mtiwmhc11.worldnet.att.net ([204.127.131.115]:35026 "EHLO mtiwmhc11.worldnet.att.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753028AbYGUTne (ORCPT ); Mon, 21 Jul 2008 15:43:34 -0400 Message-ID: <4884E6E6.7010800@lwfinger.net> Date: Mon, 21 Jul 2008 14:43:34 -0500 From: Larry Finger User-Agent: Thunderbird 2.0.0.12 (X11/20071114) MIME-Version: 1.0 To: Ingo Molnar CC: Ian Schram , David Miller , torvalds@linux-foundation.org, akpm@linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, wireless , j@w1.fi Subject: Re: [crash] BUG: unable to handle kernel NULL pointer dereference at 0000000000000370 References: <20080721134506.GA27598@elte.hu> <20080721143023.GA32451@elte.hu> <20080721150446.GA17746@elte.hu> <20080721.082419.70392960.davem@davemloft.net> <4884D2F1.2030704@telenet.be> <20080721190646.GA19044@elte.hu> <4884DFEE.4060003@lwfinger.net> <20080721193425.GA29287@elte.hu> In-Reply-To: <20080721193425.GA29287@elte.hu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Ingo Molnar wrote: > * Larry Finger wrote: > >> Ingo Molnar wrote: >>> * Ian Schram 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 Yes, I'm chasing a distinct bug. The header for mine is Jul 21 12:19:37 larrylap kernel: kernel BUG at net/core/dev.c:1328! Jul 21 12:19:37 larrylap kernel: invalid opcode: 0000 [1] SMP Jul 21 12:19:37 larrylap kernel: CPU 0 Jul 21 12:19:37 larrylap kernel: Modules linked in: af_packet rfkill_input nfs lockd nfs_acl sunrpc cpufreq_conservative cpu freq_userspace cpufreq_powersave powernow_k8 fuse loop dm_mod arc4 ecb crypto_blkcipher b43 firmware_class rfkill mac80211 c fg80211 snd_hda_intel snd_pcm snd_timer led_class snd k8temp input_polldev sr_mod soundcore button battery hwmon cdrom force deth ac serio_raw ssb snd_page_alloc sg ehci_hcd sd_mod ohci_hcd usbcore edd fan thermal processor ext3 mbcache jbd pata_amd ahci libata scsi_mod dock Jul 21 12:19:37 larrylap kernel: Pid: 2057, comm: b43 Not tainted 2.6.26-Linus-git-05253-g14b395e #1 Jul 21 12:19:37 larrylap kernel: RIP: 0010:[] [] __netif_schedule+0x12/0x75 Jul 21 12:19:37 larrylap kernel: RSP: 0000:ffff8800b9ae1de0 EFLAGS: 00010246 With an invalid opcode, mine is likely due to stack corruption. Larry