Today I also had an oops thrown in for good measure after having used the system just fine for a number of hours. Mar 26 20:42:13 dolores kernel: [16405.704602] ------------[ cut here ]------------ Mar 26 20:42:13 dolores kernel: [16405.704605] WARNING: at /build/buildd/linux-2.6.28/fs/sysfs/group.c:138 sysfs_remove_group+0xd9/0xe0() Mar 26 20:42:13 dolores kernel: [16405.704608] sysfs group ffffffff80904c80 not found for kobject 'wlan0' Mar 26 20:42:13 dolores kernel: [16405.704610] Modules linked in: binfmt_misc ppdev bnep vboxnetflt vboxdrv bridge stp kvm_intel kvm video output xfs dm_crypt vhba coretemp it87 hwmon_vid sbp2 lp parport arc4 ecb snd_hda_intel tda18271 snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi tda8290 snd_seq_midi_event snd_seq tda10048 snd_timer rt73usb crc_itu_t snd_seq_device rt2x00usb rt2x00lib led_class input_polldev cx23885 snd lbm_cw_mac80211 cx2341x videobuf_dma_sg soundcore snd_page_alloc nvidia(P) serio_raw lirc_mceusb2 lbm_cw_cfg80211 lirc_dev videobuf_dvb dvb_core videobuf_core v4l2_common videodev v4l1_compat v4l2_compat_ioctl32 btcx_risc tveeprom usbhid usb_storage forcedeth ohci1394 ieee1394 fbcon tileblit font bitblit softcursor Mar 26 20:42:13 dolores kernel: [16405.704677] Pid: 41, comm: khubd Tainted: P 2.6.28-11-generic #37-Ubuntu Mar 26 20:42:13 dolores kernel: [16405.704679] Call Trace: Mar 26 20:42:13 dolores kernel: [16405.704685] [] warn_slowpath+0xb7/0xf0 Mar 26 20:42:13 dolores kernel: [16405.704689] [] ? __slab_free+0xac/0x110 Mar 26 20:42:13 dolores kernel: [16405.704694] [] ? ifind_fast+0x9c/0xa0 Mar 26 20:42:13 dolores kernel: [16405.704697] [] ? ilookup+0x36/0x50 Mar 26 20:42:13 dolores kernel: [16405.704701] [] ? release_sysfs_dirent+0x61/0xe0 Mar 26 20:42:13 dolores kernel: [16405.704704] [] ? sysfs_find_dirent+0x2d/0x40 Mar 26 20:42:13 dolores kernel: [16405.704707] [] sysfs_remove_group+0xd9/0xe0 Mar 26 20:42:13 dolores kernel: [16405.704713] [] device_remove_attrs+0x48/0xe0 Mar 26 20:42:13 dolores kernel: [16405.704717] [] device_del+0x100/0x1d0 Mar 26 20:42:13 dolores kernel: [16405.704722] [] netdev_unregister_kobject+0x27/0x30 Mar 26 20:42:13 dolores kernel: [16405.704726] [] rollback_registered+0xa6/0x130 Mar 26 20:42:13 dolores kernel: [16405.704729] [] unregister_netdevice+0x1d/0x70 Mar 26 20:42:13 dolores kernel: [16405.704747] [] ieee80211_remove_interfaces+0x7c/0xb0 [lbm_cw_mac80211] Mar 26 20:42:13 dolores kernel: [16405.704762] [] lbm_cw_ieee80211_unregister_hw+0x31/0xf0 [lbm_cw_mac80211] Mar 26 20:42:13 dolores kernel: [16405.704770] [] rt2x00lib_remove_hw+0x89/0xa0 [rt2x00lib] Mar 26 20:42:13 dolores kernel: [16405.704776] [] rt2x00lib_remove_dev+0x40/0x60 [rt2x00lib] Mar 26 20:42:13 dolores kernel: [16405.704783] [] rt2x00usb_disconnect+0x2a/0x70 [rt2x00usb] Mar 26 20:42:13 dolores kernel: [16405.704788] [] usb_unbind_interface+0x62/0x150 Mar 26 20:42:13 dolores kernel: [16405.704793] [] __device_release_driver+0x9d/0xe0 Mar 26 20:42:13 dolores kernel: [16405.704796] [] device_release_driver+0x2b/0x40 Mar 26 20:42:13 dolores kernel: [16405.704799] [] bus_remove_device+0xa5/0xe0 Mar 26 20:42:13 dolores kernel: [16405.704803] [] device_del+0x108/0x1d0 Mar 26 20:42:13 dolores kernel: [16405.704807] [] usb_disable_device+0xb9/0x140 Mar 26 20:42:13 dolores kernel: [16405.704811] [] usb_disconnect+0xbc/0x180 Mar 26 20:42:13 dolores kernel: [16405.704815] [] hub_port_connect_change+0x1be/0xab0 Mar 26 20:42:13 dolores kernel: [16405.704819] [] ? usb_free_urb+0x15/0x20 Mar 26 20:42:13 dolores kernel: [16405.704822] [] ? usb_start_wait_urb+0x91/0xe0 Mar 26 20:42:13 dolores kernel: [16405.704825] [] ? usb_control_msg+0xef/0x110 Mar 26 20:42:13 dolores kernel: [16405.704828] [] hub_events+0x2e3/0x660 Mar 26 20:42:13 dolores kernel: [16405.704832] [] hub_thread+0x3d/0x180 Mar 26 20:42:13 dolores kernel: [16405.704837] [] ? autoremove_wake_function+0x0/0x40 Mar 26 20:42:13 dolores kernel: [16405.704840] [] ? hub_thread+0x0/0x180 Mar 26 20:42:13 dolores kernel: [16405.704844] [] kthread+0x49/0x90 Mar 26 20:42:13 dolores kernel: [16405.704848] [] child_rip+0xa/0x11 Mar 26 20:42:13 dolores kernel: [16405.704852] [] ? kthread+0x0/0x90 Mar 26 20:42:13 dolores kernel: [16405.704855] [] ? child_rip+0x0/0x11 Mar 26 20:42:13 dolores kernel: [16405.704857] ---[ end trace 5fbf3f25165a0d94 ]--- Attached is the full kern.log