Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755042Ab0HCIid (ORCPT ); Tue, 3 Aug 2010 04:38:33 -0400 Received: from mail-pv0-f174.google.com ([74.125.83.174]:60270 "EHLO mail-pv0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751882Ab0HCIia (ORCPT ); Tue, 3 Aug 2010 04:38:30 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; b=MoK2Xx0EczGI+GUGZn30SstogdC1ImpGTY1JA9cA33wj2/y4HhA/Fjh8IxBw489Weg TwfTEDWIT4Lj4s2CGB2a/yLL8w+X6ZoIglGfLODSpbMl1WcFuu2U7/kTL6xXr+PKvx5p bSpSGYO0PqN877KW+r6QbLVjRcQWs6+FS3bbA= MIME-Version: 1.0 In-Reply-To: References: <1280460642.2173.3.camel@localhost.localdomain> Date: Tue, 3 Aug 2010 10:38:30 +0200 X-Google-Sender-Auth: jBtyBD45WgK6TxyWpDa3jyt0QdA Message-ID: Subject: Re: 2.6.33.6-rt26: oops From: John Kacur To: Fernando Lopez-Lezcano Cc: john stultz , Thomas Gleixner , LKML , rt-users , Steven Rostedt , Nick Piggin Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4587 Lines: 93 On Tue, Aug 3, 2010 at 10:18 AM, John Kacur wrote: > On Fri, Jul 30, 2010 at 5:30 AM, Fernando Lopez-Lezcano > wrote: >> Hi all... >> This may not be rt related but here it goes anyway. It happened when I >> tried to restart my iptables service (/sbin/service iptables start). I >> think a day or two ago I had another network related hang, but it was a >> complete hang (no clues left behind - power button to reset). >> >> -- Fernando >> >> >> >> Jul 29 18:27:57 localhost kernel: BUG: unable to handle kernel NULL >> pointer dereference at (null) >> Jul 29 18:27:57 localhost kernel: IP: [] exit_creds+0xc/0x54 >> Jul 29 18:27:57 localhost kernel: *pdpt = 0000000000a68001 *pde = >> 0000000000000000 >> Jul 29 18:27:57 localhost kernel: Oops: 0000 [#1] PREEMPT SMP >> Jul 29 18:27:57 localhost kernel: last sysfs >> file: /sys/devices/virtual/net/pan0/statistics/collisions >> Jul 29 18:27:57 localhost kernel: Modules linked in: snd_seq_midi >> snd_seq_midi_event snd_seq_dummy snd_usb_audio snd_usb_lib snd_rawmidi >> fuse rfcomm sco bridge stp llc bnep l2cap sunrpc cpufreq_ondemand >> acpi_cpufreq ip6t_REJECT nf_conntrack_ipv6 ip6table_filter ip6_tables >> ipv6 dm_multipath uinput arc4 snd_hda_codec_analog ecb iwl3945 >> snd_hda_intel snd_hda_codec iwlcore thinkpad_acpi btusb sdhci_pci sdhci >> mmc_core snd_hwdep e1000e snd_seq ohci1394 ricoh_mmc snd_seq_device >> snd_pcm snd_timer snd mac80211 i2c_i801 iTCO_wdt iTCO_vendor_support >> joydev cfg80211 bluetooth snd_page_alloc rfkill soundcore yenta_socket >> rsrc_nonstatic i915 drm_kms_helper drm i2c_algo_bit i2c_core video >> output [last unloaded: microcode] >> Jul 29 18:27:57 localhost kernel: >> Jul 29 18:27:57 localhost kernel: Pid: 6956, comm: sirq-rcu/1 Not >> tainted 2.6.33.6-147.2.4.rt26.1.fc12.ccrma.i686.rtPAE #1 6463CTO/6463CTO >> Jul 29 18:27:57 localhost kernel: EIP: 0060:[] EFLAGS: >> 00010287 CPU: 1 >> Jul 29 18:27:57 localhost kernel: EIP is at exit_creds+0xc/0x54 >> Jul 29 18:27:57 localhost kernel: EAX: 00000000 EBX: f0e1a430 ECX: >> f0e1a960 EDX: 00000000 >> Jul 29 18:27:57 localhost kernel: ESI: c410434c EDI: f0e1a960 EBP: >> f3321f38 ESP: f3321f34 >> Jul 29 18:27:57 localhost kernel: DS: 007b ES: 007b FS: 00d8 GS: 00e0 >> SS: 0068 preempt:00000000 >> Jul 29 18:27:57 localhost kernel: Process sirq-rcu/1 (pid: 6956, >> ti=f3320000 task=f2b92d30 task.ti=f3320000) >> Jul 29 18:27:57 localhost kernel: Stack: >> Jul 29 18:27:57 localhost kernel: f0e1a430 f3321f44 c043e974 c4104334 >> f3321f4c c043e9b4 f3321f70 c048507b >> Jul 29 18:27:57 localhost kernel: <0> 00000000 00000000 c099bbc0 >> 00000283 c4103fdc c0a5cfec 00000200 f3321f78 >> Jul 29 18:27:57 localhost kernel: <0> c0485192 f3321fa4 c044445e >> c0a5cfec f2b92d30 fffffdff 00000001 00000000 >> Jul 29 18:27:57 localhost kernel: Call Trace: >> Jul 29 18:27:57 localhost kernel: [] ? __put_task_struct >> +0x54/0x87 >> Jul 29 18:27:57 localhost kernel: [] ? __put_task_struct_cb >> +0xd/0xf >> Jul 29 18:27:57 localhost kernel: [] ? __rcu_process_callbacks >> +0x153/0x21a >> Jul 29 18:27:57 localhost kernel: [] ? rcu_process_callbacks >> +0x50/0x57 >> Jul 29 18:27:57 localhost kernel: [] ? run_ksoftirqd >> +0x138/0x236 >> Jul 29 18:27:57 localhost kernel: [] ? run_ksoftirqd+0x0/0x236 >> Jul 29 18:27:57 localhost kernel: [] ? kthread+0x5f/0x64 >> Jul 29 18:27:57 localhost kernel: [] ? kthread+0x0/0x64 >> Jul 29 18:27:57 localhost kernel: [] ? kernel_thread_helper >> +0x6/0x10 >> Jul 29 18:27:57 localhost kernel: Code: 00 00 00 89 f8 e8 cb d7 1d 00 89 >> f0 e8 bc fd ff ff 89 f0 e8 b5 fd ff ff 31 c0 5b 5e 5f 5d c3 55 89 e5 53 >> 89 c3 8b 80 0c 03 00 00 <8b> 00 8b 83 08 03 00 00 c7 83 08 03 00 00 00 >> 00 00 00 e8 8b fd >> Jul 29 18:27:57 localhost kernel: EIP: [] exit_creds+0xc/0x54 >> SS:ESP 0068:f3321f34 >> Jul 29 18:27:57 localhost kernel: CR2: 0000000000000000 >> Jul 29 18:27:57 localhost kernel: ---[ end trace ebf66505b4c2cac5 ]--- >> > > Is this easily reproducible? If so, can you try again with v2.6.33.6-rt28? > Thanks > Ugh, sorry for the noise, I didn't see the other thread in which Thomas says "Yeah, that's the iptables locking problem, which is fixed in rt27." More coffee needed. John -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/