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Date: Wed, 08 Apr 2009 15:27:02 +0800
From: Wang Chen <wangchen@cn.fujitsu.com>
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To: Alessandro Suardi <alessandro.suardi@gmail.com>,
       Rusty Russell <rusty@rustcorp.com.au>, Ingo Molnar <mingo@elte.hu>
CC: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Microcode driver causing WARNING in 2.6.29-git13/14 on Dell E6400
References: <5a4c581d0904070407k6ba559bcra4a79b5e3e49725f@mail.gmail.com>
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Alessandro Suardi said the following on 2009-4-7 19:07:
> Dell Latitude E6400, F10-uptodate as of yesterday, 2.6.29-git14 plus
>  Vegard Nossum's fix to acpi/battery.c to allow booting (this specific
>  WARNING was also printed during -git13 boot, which would eventually
>  hang prior to Vegard's patch).
> 
> dmesg excerpt:
> 
> 
> 
> Adding 4096532k swap on /dev/sda5.  Priority:-1 extents:1 across:4096532k
> SELinux: initialized (dev binfmt_misc, type binfmt_misc), uses genfs_contexts
> platform microcode: firmware: requesting intel-ucode/06-17-06
> platform microcode: firmware: requesting intel-ucode/06-17-06
> Microcode Update Driver: v2.00 <tigran@aivazian.fsnet.co.uk>, Peter Oruba
> ------------[ cut here ]------------
> WARNING: at fs/sysfs/group.c:138 sysfs_remove_group+0x60/0xef()
> Hardware name: Latitude E6400
> sysfs group ffffffffa0136850 not found for kobject 'cpu0'
> Modules linked in: microcode(-) snd_hda_codec_intelhdmi snd_hda_intel
> snd_hda_codec snd_hwdep snd_seq_dummy snd_seq_oss snd_seq_midi_event
> snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd
> battery pcspkr video dell_laptop firewire_ohci rfkill i2c_i801 ac
> firewire_core dcdbas soundcore usb_storage crc_itu_t output i2c_core
> joydev snd_page_alloc [last unloaded: scsi_wait_scan]
> Pid: 2570, comm: rmmod Not tainted 2.6.29-git14 #1
> Call Trace:
>  [<ffffffff81047c2e>] warn_slowpath+0xcc/0x11c
>  [<ffffffff811b4fd5>] ? kobject_release+0x6d/0x8c
>  [<ffffffff811b4f68>] ? kobject_release+0x0/0x8c
>  [<ffffffff8113f208>] sysfs_remove_group+0x60/0xef
>  [<ffffffffa01344b4>] mc_sysdev_remove+0x42/0x5f [microcode]
>  [<ffffffff8125970b>] sysdev_driver_unregister+0x6c/0xb8
>  [<ffffffffa0134f9a>] microcode_exit+0x47/0x87 [microcode]
>  [<ffffffff81075317>] sys_delete_module+0x1cb/0x246
>  [<ffffffff813c2b09>] ? trace_hardirqs_on_thunk+0x3a/0x3c
>  [<ffffffff8100bf6b>] system_call_fastpath+0x16/0x1b
> ---[ end trace 13427fb4ef873fae ]---
> ------------[ cut here ]------------
> WARNING: at fs/sysfs/group.c:138 sysfs_remove_group+0x60/0xef()
> Hardware name: Latitude E6400
> sysfs group ffffffffa0136850 not found for kobject 'cpu1'
> Modules linked in: microcode(-) snd_hda_codec_intelhdmi snd_hda_intel
> snd_hda_codec snd_hwdep snd_seq_dummy snd_seq_oss snd_seq_midi_event
> snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd
> battery pcspkr video dell_laptop firewire_ohci rfkill i2c_i801 ac
> firewire_core dcdbas soundcore usb_storage crc_itu_t output i2c_core
> joydev snd_page_alloc [last unloaded: scsi_wait_scan]
> Pid: 2570, comm: rmmod Tainted: G        W  2.6.29-git14 #1
> Call Trace:
>  [<ffffffff81047c2e>] warn_slowpath+0xcc/0x11c
>  [<ffffffff811b4fd5>] ? kobject_release+0x6d/0x8c
>  [<ffffffff811b4f68>] ? kobject_release+0x0/0x8c
>  [<ffffffff8113f208>] sysfs_remove_group+0x60/0xef
>  [<ffffffffa01344b4>] mc_sysdev_remove+0x42/0x5f [microcode]
>  [<ffffffff8125970b>] sysdev_driver_unregister+0x6c/0xb8
>  [<ffffffffa0134f9a>] microcode_exit+0x47/0x87 [microcode]
>  [<ffffffff81075317>] sys_delete_module+0x1cb/0x246
>  [<ffffffff813c2b09>] ? trace_hardirqs_on_thunk+0x3a/0x3c
>  [<ffffffff8100bf6b>] system_call_fastpath+0x16/0x1b
> ---[ end trace 13427fb4ef873faf ]---
> Microcode Update Driver: v2.00 removed.
> 
> 
> System seems to work at the moment (apart from unrelated X/VT
>  issues I plan to report in a detailed fashion by the end of this week).
> 

I encounter this warning too.
Seems commit af5c820a3169e81af869c113e18ec7588836cd50 intends to hunt
this warning when microcode_init_cpu() failed.

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