Running that kernel I received a warning and then an Oops. Aug 28 11:32:58 impulse kernel: [ 610.766544] ------------[ cut here ]------------ Aug 28 11:32:58 impulse kernel: [ 610.766554] WARNING: CPU: 1 PID: 3487 at /home/apw/COD/linux/include/linux/kref.h:47 kobject_get+0x42/0x50() Aug 28 11:32:58 impulse kernel: [ 610.766555] Modules linked in: rpcsec_gss_krb5 nfsv4 nfsv3 hid_magicmouse hidp xt_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp ip6table_filter ip6_tables iptable_filter ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack ip_tables x_tables bridge stp llc autofs4 dm_crypt snd_hda_codec_hdmi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd eeepc_wmi asus_wmi parport_pc sparse_keymap ppdev rfcomm bnep microcode psmouse serio_raw snd_hda_codec_realtek btusb snd_seq_midi joydev bluetooth snd_seq_midi_event snd_rawmidi snd_hda_intel snd_hda_codec snd_hwdep snd_pcm lpc_ich snd_seq snd_page_alloc snd_seq_device snd_timer snd dm_snapshot soundcore mei_me mei lp parport mac_hid nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache ext2 btrfs xor zlib_deflate raid6_pq libcrc32c hid_microsoft usb_storage hid_gen Aug 28 11:32:58 impulse kernel: eric usbhid hid nouveau mxm_wmi i2c_algo_bit ttm drm_kms_helper ahci r8169 libahci drm mii video wmi Aug 28 11:32:58 impulse kernel: [ 610.766625] CPU: 1 PID: 3487 Comm: gnome-control-c Not tainted 3.11.0-031100rc4-generic #201308041735 Aug 28 11:32:58 impulse kernel: [ 610.766626] Hardware name: System manufacturer System Product Name/P8Z77-V LX, BIOS 1106 07/27/2012 Aug 28 11:32:58 impulse kernel: [ 610.766628] 000000000000002f ffff8803e0201ca8 ffffffff8171e4eb 0000000000000007 Aug 28 11:32:58 impulse kernel: [ 610.766631] 0000000000000000 ffff8803e0201ce8 ffffffff8106532c ffff88040e001700 Aug 28 11:32:58 impulse kernel: [ 610.766633] ffff880404d85800 ffff8804060c0b40 0000000000000282 ffff88040626e8a0 Aug 28 11:32:58 impulse kernel: [ 610.766636] Call Trace: Aug 28 11:32:58 impulse kernel: [ 610.766641] [] dump_stack+0x46/0x58 Aug 28 11:32:58 impulse kernel: [ 610.766645] [] warn_slowpath_common+0x8c/0xc0 Aug 28 11:32:58 impulse kernel: [ 610.766648] [] warn_slowpath_null+0x1a/0x20 Aug 28 11:32:58 impulse kernel: [ 610.766651] [] kobject_get+0x42/0x50 Aug 28 11:32:58 impulse kernel: [ 610.766656] [] ? __alloc_skb+0x87/0x2a0 Aug 28 11:32:58 impulse kernel: [ 610.766659] [] get_device+0x19/0x20 Aug 28 11:32:58 impulse kernel: [ 610.766662] [] usb_get_dev+0x22/0x30 Aug 28 11:32:58 impulse kernel: [ 610.766665] [] usb_hcd_unlink_urb+0x40/0xf0 Aug 28 11:32:58 impulse kernel: [ 610.766668] [] usb_kill_urb.part.5+0x1f/0xa0 Aug 28 11:32:58 impulse kernel: [ 610.766672] [] ? kmem_cache_free+0x121/0x180 Aug 28 11:32:58 impulse kernel: [ 610.766687] [] ? hci_dev_do_close+0x182/0x430 [bluetooth] Aug 28 11:32:58 impulse kernel: [ 610.766689] [] usb_kill_urb+0x31/0x40 Aug 28 11:32:58 impulse kernel: [ 610.766692] [] usb_kill_anchored_urbs+0x51/0x80 Aug 28 11:32:58 impulse kernel: [ 610.766697] [] btusb_close+0x6d/0xe0 [btusb] Aug 28 11:32:58 impulse kernel: [ 610.766706] [] hci_dev_do_close+0x196/0x430 [bluetooth] Aug 28 11:32:58 impulse kernel: [ 610.766716] [] hci_rfkill_set_block+0x2f/0x60 [bluetooth] Aug 28 11:32:58 impulse kernel: [ 610.766720] [] rfkill_set_block+0x91/0x140 Aug 28 11:32:58 impulse kernel: [ 610.766723] [] rfkill_fop_write+0xe3/0x160 Aug 28 11:32:58 impulse kernel: [ 610.766726] [] vfs_write+0xce/0x200 Aug 28 11:32:58 impulse kernel: [ 610.766729] [] SyS_write+0x52/0xa0 Aug 28 11:32:58 impulse kernel: [ 610.766732] [] tracesys+0xe1/0xe6 Aug 28 11:32:58 impulse kernel: [ 610.766734] ---[ end trace 91e07bfeb35c827c ]--- Aug 28 11:32:58 impulse kernel: [ 610.766741] BUG: unable to handle kernel NULL pointer dereference at 0000000000000138 Aug 28 11:32:58 impulse kernel: [ 610.766755] IP: [] usb_rh_urb_dequeue+0x6f/0x110 Aug 28 11:32:58 impulse kernel: [ 610.766761] PGD 0 Aug 28 11:32:58 impulse kernel: [ 610.766765] Oops: 0000 [#1] SMP Aug 28 11:32:58 impulse kernel: [ 610.766770] Modules linked in: rpcsec_gss_krb5 nfsv4 nfsv3 hid_magicmouse hidp xt_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp ip6table_filter ip6_tables iptable_filter ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack ip_tables x_tables bridge stp llc autofs4 dm_crypt snd_hda_codec_hdmi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd eeepc_wmi asus_wmi parport_pc sparse_keymap ppdev rfcomm bnep microcode psmouse serio_raw snd_hda_codec_realtek btusb snd_seq_midi joydev bluetooth snd_seq_midi_event snd_rawmidi snd_hda_intel snd_hda_codec snd_hwdep snd_pcm lpc_ich snd_seq snd_page_alloc snd_seq_device snd_timer snd dm_snapshot soundcore mei_me mei lp parport mac_hid nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache ext2 btrfs xor zlib_deflate raid6_pq libcrc32c hid_microsoft usb_storage hid_gen Aug 28 11:32:58 impulse kernel: eric usbhid hid nouveau mxm_wmi i2c_algo_bit ttm drm_kms_helper ahci r8169 libahci drm mii video wmi Aug 28 11:32:58 impulse kernel: [ 610.766908] CPU: 1 PID: 3487 Comm: gnome-control-c Tainted: G W 3.11.0-031100rc4-generic #201308041735 Aug 28 11:32:58 impulse kernel: [ 610.766914] Hardware name: System manufacturer System Product Name/P8Z77-V LX, BIOS 1106 07/27/2012 Aug 28 11:32:58 impulse kernel: [ 610.766919] task: ffff8803df294650 ti: ffff8803e0200000 task.ti: ffff8803e0200000 Aug 28 11:32:58 impulse kernel: [ 610.766924] RIP: 0010:[] [] usb_rh_urb_dequeue+0x6f/0x110 Aug 28 11:32:58 impulse kernel: [ 610.766932] RSP: 0018:ffff8803e0201cf8 EFLAGS: 00010002 Aug 28 11:32:58 impulse kernel: [ 610.766936] RAX: 0000000000000000 RBX: ffff8804060c0b40 RCX: ffff8804060c0490 Aug 28 11:32:58 impulse kernel: [ 610.766943] RDX: ffff8804060c0b60 RSI: ffff8804060c0480 RDI: ffffffff81fbede8 Aug 28 11:32:58 impulse kernel: [ 610.766948] RBP: ffff8803e0201d38 R08: 000000000000000a R09: 0000000000000000 Aug 28 11:32:58 impulse kernel: [ 610.766953] R10: 0000000000000412 R11: 0000000000000411 R12: 0000000000000000 Aug 28 11:32:58 impulse kernel: [ 610.766957] R13: 0000000000000286 R14: 0000000000000000 R15: 00000000fffffffe Aug 28 11:32:58 impulse kernel: [ 610.766963] FS: 00007f615d331980(0000) GS:ffff88041ec80000(0000) knlGS:0000000000000000 Aug 28 11:32:58 impulse kernel: [ 610.766968] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Aug 28 11:32:58 impulse kernel: [ 610.766972] CR2: 0000000000000138 CR3: 00000003dfb23000 CR4: 00000000001407e0 Aug 28 11:32:58 impulse kernel: [ 610.766977] Stack: Aug 28 11:32:58 impulse kernel: [ 610.766979] ffff8803e0201d18 ffffffff81368c62 ffffffff8160d567 00000000fffffffe Aug 28 11:32:58 impulse kernel: [ 610.766987] ffff8804060c0b40 0000000000000282 ffff88040626e8a0 00007fff660b9f40 Aug 28 11:32:58 impulse kernel: [ 610.766994] ffff8803e0201d48 ffffffff81534f35 ffff8803e0201d78 ffffffff81536a02 Aug 28 11:32:58 impulse kernel: [ 610.767002] Call Trace: Aug 28 11:32:58 impulse kernel: [ 610.767007] [] ? kobject_get+0x42/0x50 Aug 28 11:32:58 impulse kernel: [ 610.767013] [] ? __alloc_skb+0x87/0x2a0 Aug 28 11:32:58 impulse kernel: [ 610.767018] [] unlink1+0x25/0x30 Aug 28 11:32:58 impulse kernel: [ 610.767023] [] usb_hcd_unlink_urb+0x62/0xf0 Aug 28 11:32:58 impulse kernel: [ 610.767028] [] usb_kill_urb.part.5+0x1f/0xa0 Aug 28 11:32:58 impulse kernel: [ 610.767034] [] ? kmem_cache_free+0x121/0x180 Aug 28 11:32:58 impulse kernel: [ 610.767046] [] ? hci_dev_do_close+0x182/0x430 [bluetooth] Aug 28 11:32:58 impulse kernel: [ 610.767052] [] usb_kill_urb+0x31/0x40 Aug 28 11:32:58 impulse kernel: [ 610.767057] [] usb_kill_anchored_urbs+0x51/0x80 Aug 28 11:32:58 impulse kernel: [ 610.767065] [] btusb_close+0x6d/0xe0 [btusb] Aug 28 11:32:58 impulse kernel: [ 610.767079] [] hci_dev_do_close+0x196/0x430 [bluetooth] Aug 28 11:32:58 impulse kernel: [ 610.767091] [] hci_rfkill_set_block+0x2f/0x60 [bluetooth] Aug 28 11:32:58 impulse kernel: [ 610.767098] [] rfkill_set_block+0x91/0x140 Aug 28 11:32:58 impulse kernel: [ 610.767104] [] rfkill_fop_write+0xe3/0x160 Aug 28 11:32:58 impulse kernel: [ 610.767110] [] vfs_write+0xce/0x200 Aug 28 11:32:58 impulse kernel: [ 610.767115] [] SyS_write+0x52/0xa0 Aug 28 11:32:58 impulse kernel: [ 610.767120] [] tracesys+0xe1/0xe6 Aug 28 11:32:58 impulse kernel: [ 610.767124] Code: 6b 0f 1f 00 48 8b 00 48 39 c8 74 60 48 39 d0 75 f3 8b 43 18 41 bc f0 ff ff ff 85 c0 75 23 44 89 7b 18 45 31 e4 f6 46 02 0f 74 16 <41> f6 86 38 01 00 00 08 74 44 45 31 e4 49 39 9e f8 00 00 00 74 Aug 28 11:32:58 impulse kernel: [ 610.767186] RIP [] usb_rh_urb_dequeue+0x6f/0x110 Aug 28 11:32:58 impulse kernel: [ 610.767192] RSP Aug 28 11:32:58 impulse kernel: [ 610.767195] CR2: 0000000000000138 Aug 28 11:32:58 impulse kernel: [ 610.772266] ---[ end trace 91e07bfeb35c827d ]--- Aug 28 11:33:26 impulse kernel: [ 639.100626] RPC: AUTH_GSS upcall timed out. Aug 28 11:33:26 impulse kernel: [ 639.100626] Please check user daemon is running. Aug 28 11:54:00 impulse kernel: [ 1871.610746] (null): USB disconnect, device number 0 Aug 28 11:54:01 impulse kernel: [ 1872.414539] BUG: unable to handle kernel NULL pointer dereference at (null) Aug 28 11:54:01 impulse kernel: [ 1872.414548] IP: [] __mutex_lock_slowpath+0xdc/0x1b0 Aug 28 11:54:01 impulse kernel: [ 1872.414555] PGD 0 Aug 28 11:54:01 impulse kernel: [ 1872.414557] Oops: 0002 [#2] SMP Aug 28 11:54:01 impulse kernel: [ 1872.414560] Modules linked in: rpcsec_gss_krb5 nfsv4 nfsv3 hid_magicmouse hidp xt_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp ip6table_filter ip6_tables iptable_filter ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack ip_tables x_tables bridge stp llc autofs4 dm_crypt snd_hda_codec_hdmi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd eeepc_wmi asus_wmi parport_pc sparse_keymap ppdev rfcomm bnep microcode psmouse serio_raw snd_hda_codec_realtek btusb snd_seq_midi joydev bluetooth snd_seq_midi_event snd_rawmidi snd_hda_intel snd_hda_codec snd_hwdep snd_pcm lpc_ich snd_seq snd_page_alloc snd_seq_device snd_timer snd dm_snapshot soundcore mei_me mei lp parport mac_hid nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache ext2 btrfs xor zlib_deflate raid6_pq libcrc32c hid_microsoft usb_storage hid_gen Aug 28 11:54:01 impulse kernel: eric usbhid hid nouveau mxm_wmi i2c_algo_bit ttm drm_kms_helper ahci r8169 libahci drm mii video wmi Aug 28 11:54:01 impulse kernel: [ 1872.414645] CPU: 2 PID: 38 Comm: khubd Tainted: G D W 3.11.0-031100rc4-generic #201308041735 Aug 28 11:54:01 impulse kernel: [ 1872.414649] Hardware name: System manufacturer System Product Name/P8Z77-V LX, BIOS 1106 07/27/2012 Aug 28 11:54:01 impulse kernel: [ 1872.414652] task: ffff88040805ddc0 ti: ffff880408194000 task.ti: ffff880408194000 Aug 28 11:54:01 impulse kernel: [ 1872.414655] RIP: 0010:[] [] __mutex_lock_slowpath+0xdc/0x1b0 Aug 28 11:54:01 impulse kernel: [ 1872.414660] RSP: 0018:ffff880408195c18 EFLAGS: 00010246 Aug 28 11:54:01 impulse kernel: [ 1872.415468] RAX: 0000000000000000 RBX: ffff880404d858e8 RCX: 0000000000000000 Aug 28 11:54:01 impulse kernel: [ 1872.416530] RDX: ffff880408195c30 RSI: ffff880408195c48 RDI: ffff880404d858ec Aug 28 11:54:01 impulse kernel: [ 1872.417594] RBP: ffff880408195c88 R08: 000000000000000a R09: 0000000000000000 Aug 28 11:54:01 impulse kernel: [ 1872.418679] R10: 0000000000000442 R11: 0000000000000441 R12: ffff880404d858ec Aug 28 11:54:01 impulse kernel: [ 1872.419720] R13: ffff88040805ddc0 R14: ffff880404d85908 R15: ffff880404d858f0 Aug 28 11:54:01 impulse kernel: [ 1872.420740] FS: 0000000000000000(0000) GS:ffff88041ed00000(0000) knlGS:0000000000000000 Aug 28 11:54:01 impulse kernel: [ 1872.421716] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Aug 28 11:54:01 impulse kernel: [ 1872.422667] CR2: 0000000000000000 CR3: 0000000001c0d000 CR4: 00000000001407e0 Aug 28 11:54:01 impulse kernel: [ 1872.423583] Stack: Aug 28 11:54:01 impulse kernel: [ 1872.424463] ffff880404d85800 ffff880404d85888 0000000000000000 ffff880404d858f0 Aug 28 11:54:01 impulse kernel: [ 1872.425346] 0000000000000000 ffffffff81483073 0000000000000000 ffff880400000001 Aug 28 11:54:01 impulse kernel: [ 1872.426227] ffff880408195cb8 ffff880404d858e8 ffff880404d85888 0000000000000000 Aug 28 11:54:01 impulse kernel: [ 1872.427095] Call Trace: Aug 28 11:54:01 impulse kernel: [ 1872.427949] [] ? _dev_info+0x53/0x60 Aug 28 11:54:01 impulse kernel: [ 1872.428806] [] mutex_lock+0x2a/0x41 Aug 28 11:54:01 impulse kernel: [ 1872.429659] [] usb_disconnect+0x5a/0x1d0 Aug 28 11:54:01 impulse kernel: [ 1872.430515] [] ? usb_alloc_urb+0x1e/0x50 Aug 28 11:54:01 impulse kernel: [ 1872.431363] [] ? usb_alloc_urb+0x1e/0x50 Aug 28 11:54:01 impulse kernel: [ 1872.432215] [] hub_port_connect_change+0xe6/0x970 Aug 28 11:54:01 impulse kernel: [ 1872.433066] [] ? usb_control_msg+0xea/0x110 Aug 28 11:54:01 impulse kernel: [ 1872.433919] [] hub_events+0x2e0/0x810 Aug 28 11:54:01 impulse kernel: [ 1872.434789] [] ? default_spin_lock_flags+0x9/0x10 Aug 28 11:54:01 impulse kernel: [ 1872.435632] [] hub_thread+0x35/0x160 Aug 28 11:54:01 impulse kernel: [ 1872.436469] [] ? add_wait_queue+0x60/0x60 Aug 28 11:54:01 impulse kernel: [ 1872.437316] [] ? hub_events+0x810/0x810 Aug 28 11:54:01 impulse kernel: [ 1872.438147] [] kthread+0xc0/0xd0 Aug 28 11:54:01 impulse kernel: [ 1872.438972] [] ? flush_kthread_worker+0xb0/0xb0 Aug 28 11:54:01 impulse kernel: [ 1872.439795] [] ret_from_fork+0x7c/0xb0 Aug 28 11:54:01 impulse kernel: [ 1872.440619] [] ? flush_kthread_worker+0xb0/0xb0 Aug 28 11:54:01 impulse kernel: [ 1872.441437] Code: 7f 9d 0f 1f 44 00 00 4c 8d 63 04 4c 8d 7b 08 4c 89 e7 e8 78 2e 00 00 48 8b 43 10 48 8d 55 a8 4c 89 7d a8 48 89 53 10 48 89 45 b0 <48> 89 10 8b 03 4c 89 6d b8 85 c0 78 0c b8 ff ff ff ff 87 03 83 Aug 28 11:54:01 impulse kernel: [ 1872.443250] RIP [] __mutex_lock_slowpath+0xdc/0x1b0 Aug 28 11:54:01 impulse kernel: [ 1872.444132] RSP Aug 28 11:54:01 impulse kernel: [ 1872.445007] CR2: 0000000000000000 Aug 28 11:54:01 impulse kernel: [ 1872.445887] ---[ end trace 91e07bfeb35c827e ]---