Microcode driver causing WARNING in 2.6.29-git13/14 on Dell E6400

[Alessandro Suardi]

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@xxxxxxxxxxxxxxxxxxxx>, 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).

--alessandro

 "Sun keeps rising in the west / I keep on waking fully confused"

   (The Replacements, "Within Your Reach")
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