------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.38/kernel/cgroup.c:4450 __css_put+0x78/0x90()
Hardware name: Aspire R3610
Modules linked in: cryptd aes_x86_64 aes_generic binfmt_misc parport_pc dm_crypt ppdev nvidia(P) snd_hda_codec_hdmi snd_hda_codec_realtek arc4 snd_usb_audio snd_usbmidi_lib snd_seq_midi snd_rawmidi snd_hda_intel snd_hda_codec snd_hwdep snd_seq_midi_event snd_seq snd_pcm ath5k ath mac80211 uvcvideo snd_timer videodev psmouse snd_seq_device snd_page_alloc snd v4l2_compat_ioctl32 cfg80211 shpchp lp serio_raw joydev i2c_nforce2 soundcore parport usbhid hid usb_storage uas ahci libahci forcedeth
Pid: 35, comm: kswapd0 Tainted: P            2.6.38-5-generic #32-Ubuntu
Call Trace:
 [<ffffffff8106574f>] ? warn_slowpath_common+0x7f/0xc0
 [<ffffffff810657aa>] ? warn_slowpath_null+0x1a/0x20
 [<ffffffff810b5488>] ? __css_put+0x78/0x90
 [<ffffffff8115ee48>] ? mem_cgroup_prepare_migration+0x108/0x1a0
 [<ffffffff8115850f>] ? unmap_and_move+0x9f/0x350
 [<ffffffff8114d4d0>] ? compaction_alloc+0x0/0x70
 [<ffffffff811589b2>] ? migrate_pages+0xa2/0x150
 [<ffffffff8114d6a4>] ? compact_zone+0xa4/0x220
 [<ffffffff81115c3d>] ? throttle_vm_writeout+0x3d/0xa0
 [<ffffffff8114d9e9>] ? compact_zone_order+0xa9/0xf0
 [<ffffffff815c0bee>] ? _raw_spin_lock+0xe/0x20
 [<ffffffff8111e573>] ? balance_pgdat+0x643/0x7a0
 [<ffffffff8111e803>] ? kswapd+0x133/0x1a0
 [<ffffffff8111e6d0>] ? kswapd+0x0/0x1a0
 [<ffffffff81086fa6>] ? kthread+0x96/0xa0
 [<ffffffff8100ce24>] ? kernel_thread_helper+0x4/0x10
 [<ffffffff81086f10>] ? kthread+0x0/0xa0
 [<ffffffff8100ce20>] ? kernel_thread_helper+0x0/0x10
---[ end trace 29884bf0fea3f4e4 ]---