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看样子好像是无线网卡方面的问题，暂不影响使用，无线网卡在启动后也能正常使用。
硬件信息如下：
07:00.0 Ethernet controller: Qualcomm Atheros QCA8171 Gigabit Ethernet (rev 10)
08:00.0 Network controller: Broadcom Corporation BCM43142 802.11b/g/n (rev 01)
系统内核版本：
$ uname -a
Linux myhost 3.13.0-44-generic #73-Ubuntu SMP Tue Dec 16 00:22:43 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
/var/log/kern.log中部分日志如下：
Dec 28 21:43:32 myhost kernel: [16670.059143] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
Dec 28 21:43:32 myhost kernel: [16670.059146] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Dec 28 21:43:32 myhost kernel: [16670.059148] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Dec 28 21:43:35 myhost kernel: [16672.565454] ————[ cut here ]————
Dec 28 21:43:35 myhost kernel: [16672.565476] WARNING: CPU: 4 PID: 454 at /build/buildd/linux-3.13.0/net/wireless/sme.c:797 cfg80211_roamed+0x89/0x90 cfg80211
Dec 28 21:43:35 myhost kernel: [16672.565488] Modules linked in: usb_storage bnep rfcomm nls_iso8859_1 snd_hda_codec_hdmi snd_hda_codec_realtek uvcvideo videobuf2_vmalloc btusb videobuf2_memops bluetooth videobuf2_core videodev x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel lib80211_crypt_tkip aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd joydev serio_raw snd_hda_intel snd_hda_codec snd_hwdep lpc_ich snd_pcm wl(POX) snd_page_alloc lib80211 nouveau snd_seq_midi i915 snd_seq_midi_event snd_rawmidi cfg80211 snd_seq snd_seq_device mxm_wmi snd_timer ttm mei_me drm_kms_helper mei snd drm soundcore i2c_algo_bit parport_pc ppdev lp parport ideapad_laptop sparse_keymap video wmi mac_hid hid_generic usbhid hid ahci psmouse alx libahci mdio
Dec 28 21:43:35 myhost kernel: [16672.565585] CPU: 4 PID: 454 Comm: wl_event_handle Tainted: P OX 3.13.0-40-generic #69-Ubuntu
Dec 28 21:43:35 myhost kernel: [16672.565596] Hardware name: LENOVO 20435/BIQY0, BIOS 74CN52WW(V3.57) 05/05/2014
Dec 28 21:43:35 myhost kernel: [16672.565599] 0000000000000009 ffff880087eb7d88 ffffffff8171f226 0000000000000000
Dec 28 21:43:35 myhost kernel: [16672.565610] ffff880087eb7dc0 ffffffff810677cd ffff880168fa5000 ffff8801389890c0
Dec 28 21:43:35 myhost kernel: [16672.565623] 000000000000009b ffff880118240e80 0000000000000001 ffff880087eb7dd0
Dec 28 21:43:35 myhost kernel: [16672.565630] Call Trace:
Dec 28 21:43:35 myhost kernel: [16672.565641] [] dump_stack+0x45/0x56
Dec 28 21:43:35 myhost kernel: [16672.565649] [] warn_slowpath_common+0x7d/0xa0
Dec 28 21:43:35 myhost kernel: [16672.565655] [] warn_slowpath_null+0x1a/0x20
Dec 28 21:43:35 myhost kernel: [16672.565680] [] cfg80211_roamed+0x89/0x90 [cfg80211]
Dec 28 21:43:35 myhost kernel: [16672.565753] [] wl_bss_connect_done.isra.21+0x98/0x1a0 [wl]
Dec 28 21:43:35 myhost kernel: [16672.565819] [] wl_notify_connect_status+0x1fc/0x410 [wl]
Dec 28 21:43:35 myhost kernel: [16672.565882] [] wl_event_handler+0x55/0x220 [wl]
Dec 28 21:43:35 myhost kernel: [16672.565944] [] ? wl_get_assoc_ies+0x240/0x240 [wl]
Dec 28 21:43:35 myhost kernel: [16672.565951] [] kthread+0xd2/0xf0
Dec 28 21:43:35 myhost kernel: [16672.565957] [] ? kthread_create_on_node+0x1c0/0x1c0
Dec 28 21:43:35 myhost kernel: [16672.565963] [] ret_from_fork+0x7c/0xb0
Dec 28 21:43:35 myhost kernel: [16672.565970] [] ? kthread_create_on_node+0x1c0/0x1c0
Dec 28 21:43:35 myhost kernel: [16672.565974] —[ end trace 0a49816fbc002f01 ]—
Dec 29 10:35:04 myhost kernel: [63012.837849] cfg80211: Calling CRDA to update world regulatory domain
Dec 29 10:35:04 myhost kernel: [63012.917091] cfg80211: World regulatory domain updated:
Dec 29 10:35:04 myhost kernel: [63012.917094] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
Dec 29 10:35:04 myhost kernel: [63012.917095] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Dec 29 10:35:04 myhost kernel: [63012.917097] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Dec 29 10:35:04 myhost kernel: [63012.917098] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
Dec 29 10:35:04 myhost kernel: [63012.917099] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Dec 29 10:35:04 myhost kernel: [63012.917100] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Jan 20 20:35:06 myhost kernel: [ 0.000000] CPU0 microcode updated early to revision 0x1a, date = 2014-05-23
Jan 20 20:35:06 myhost kernel: [ 0.000000] Initializing cgroup subsys cpuset
Jan 20 20:35:06 myhost kernel: [ 0.000000] Initializing cgroup subsys cpu
Jan 20 20:35:06 myhost kernel: [ 0.000000] Initializing cgroup subsys cpuacct
Jan 20 20:35:06 myhost kernel: [ 0.000000] Linux version 3.13.0-40-generic (buildd@comet) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #69-Ubuntu SMP Thu Nov 13 17:53:56 UTC 2014 (Ubuntu 3.13.0-40.69-generic 3.13.11.10)
先记录在这里，待空了再解决。
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原文地址：http://my.oschina.net/u/565856/blog/378217
