[38781.331993] ath9k 0000:02:00.0 wlan2: disabling HT as WMM/QoS is not supported by the AP
[38781.331995] ath9k 0000:02:00.0 wlan2: disabling VHT as WMM/QoS is not supported by the AP
[38781.333807] wlan2: associate with c0:25:06:94:4a:b5 (try 1/3)
[38781.337856] wlan2: RX AssocResp from c0:25:06:94:4a:b5 (capab=0x411 status=0 aid=3)
[38781.338020] wlan2: associated
[38781.338062] IPv6: ADDRCONF(NETDEV_CHANGE): wlan2: link becomes ready
[38785.348352] xhci_hcd 0000:00:14.0: Timeout while waiting for address device command
[38785.348405] ------------[ cut here ]------------
[38785.348425] WARNING: CPU: 0 PID: 0 at /build/linux-zODV55/linux-3.13.0/drivers/usb/host/xhci-ring.c:1590 handle_cmd_completion+0xe56/0xe60()
[38785.348429] Modules linked in: hid_generic usbhid hid usb_storage ctr ccm pci_stub vboxpci(OX) vboxnetadp(OX) vboxnetflt(OX) vboxdrv(OX) cuse nfnetlink_queue nfnetlink_log nfnetlink bbswitch(OX) dm_crypt bnep rfcomm rts5139(C) uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev intel_rapl x86_pkg_temp_thermal binfmt_misc intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul arc4 aesni_intel ath9k ath9k_common aes_x86_64 lrw ath9k_hw gf128mul glue_helper ablk_helper cryptd ath mac80211 joydev snd_hda_codec_hdmi snd_hda_codec_conexant ath3k snd_seq_midi btusb snd_seq_midi_event serio_raw snd_rawmidi lpc_ich bluetooth snd_hda_intel cfg80211 snd_hda_codec snd_hwdep snd_pcm snd_seq shpchp snd_seq_device snd_page_alloc snd_timer mei_me snd mei soundcore ideapad_laptop sparse_keymap parport_pc ppdev wmi mac_hid lp parport btrfs xor raid6_pq libcrc32c i915 ahci psmouse libahci r8169 mii i2c_algo_bit drm_kms_helper video drm [last unloaded: nvidia]
[38785.348551] CPU: 0 PID: 0 Comm: swapper/0 Tainted: P C OX 3.13.0-86-generic #131-Ubuntu
[38785.348555] Hardware name: LENOVO 20354/Lancer 5A5, BIOS 9BCN29WW 10/20/2014
[38785.348558] 0000000000000000 ffff88014f203d90 ffffffff8172a394 0000000000000000
[38785.348566] 0000000000000009 ffff88014f203dc8 ffffffff810699bd ffff880143f26250
[38785.348572] ffff880143f241b0 000000000000000e 0000000143f241b0 ffff880143f3a000
[38785.348579] Call Trace:
[38785.348583] <IRQ> [<ffffffff8172a394>] dump_stack+0x64/0x82
[38785.348603] [<ffffffff810699bd>] warn_slowpath_common+0x7d/0xa0
[38785.348610] [<ffffffff81069a9a>] warn_slowpath_null+0x1a/0x20
[38785.348618] [<ffffffff81585286>] handle_cmd_completion+0xe56/0xe60
[38785.348625] [<ffffffff81586b9b>] xhci_irq+0x33b/0xa50
[38785.348636] [<ffffffff810aa7e5>] ? rebalance_domains+0x155/0x250
[38785.348644] [<ffffffff815872c1>] xhci_msi_irq+0x11/0x20
[38785.348653] [<ffffffff810c2a3e>] handle_irq_event_percpu+0x4e/0x220
[38785.348659] [<ffffffff810c2c4d>] handle_irq_event+0x3d/0x60
[38785.348667] [<ffffffff810c5717>] handle_edge_irq+0x77/0x130
[38785.348679] [<ffffffff81016e9e>] handle_irq+0x1e/0x30
[38785.348690] [<ffffffff8173d31d>] do_IRQ+0x4d/0xc0
[38785.348698] [<ffffffff8173292d>] common_interrupt+0x6d/0x6d
[38785.348701] <EOI> [<ffffffff815db462>] ? cpuidle_enter_state+0x52/0xc0
[38785.348718] [<ffffffff815db458>] ? cpuidle_enter_state+0x48/0xc0
[38785.348726] [<ffffffff815db5ac>] cpuidle_idle_call+0xdc/0x220
[38785.348736] [<ffffffff8101e4de>] arch_cpu_idle+0xe/0x30
[38785.348742] [<ffffffff810c1e65>] cpu_startup_entry+0xc5/0x2b0
[38785.348752] [<ffffffff81718497>] rest_init+0x77/0x80
[38785.348763] [<ffffffff81d34f70>] start_kernel+0x438/0x443
[38785.348770] [<ffffffff81d34941>] ? repair_env_string+0x5c/0x5c
[38785.348778] [<ffffffff81d34120>] ? early_idt_handler_array+0x120/0x120
[38785.348787] [<ffffffff81d345ee>] x86_64_start_reservations+0x2a/0x2c
[38785.348794] [<ffffffff81d34733>] x86_64_start_kernel+0x143/0x152
[38785.348798] ---[ end trace 1155aaf61c53ace8 ]---
[38785.552636] usb 2-7: Device not responding to set address.
[38785.756622] usb 2-7: device not accepting address 15, error -71
[38785.868666] usb 2-7: new full-speed USB device number 16 using xhci_hcd
[38785.886251] usb 2-7: New USB device found, idVendor=0cf3, idProduct=3004
[38785.886261] usb 2-7: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[38786.412978] xhci_hcd 0000:00:14.0: xHCI host not responding to stop endpoint command.
[38786.412988] xhci_hcd 0000:00:14.0: Assuming host is dying, halting host.
[38786.413038] xhci_hcd 0000:00:14.0: HC died; cleaning up
[38786.413092] usb 2-3: USB disconnect, device number 11
[38786.413110] usb 2-3.3: USB disconnect, device number 12
[38786.461748] usb 2-4: USB disconnect, device number 2
[38786.673935] usb 2-6: USB disconnect, device number 3
[38786.717680] usb 2-7: USB disconnect, device number 16
[38873.338271] mce: [Hardware Error]: Machine check events logged