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~$ uname -a
Linux vsn 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux


[ 2774.388864] ------------[ cut here ]------------
[ 2774.388895] WARNING: CPU: 0 PID: 4322 at /build/buildd/linux-3.13.0/net/mac80211/sta_info.c:432 sta_info_insert_rcu+0xb7/0xe0 [mac80211]()
[ 2774.388899] Modules linked in: ipt_MASQUERADE xt_conntrack ipt_REJECT xt_tcpudp iptable_filter nf_nat_h323 nf_conntrack_h323 nf_nat_pptp nf_nat_proto_gre nf_conntrack_pptp nf_conntrack_proto_gre nf_nat_tftp nf_conntrack_tftp nf_nat_sip nf_conntrack_sip nf_nat_irc nf_conntrack_irc nf_nat_ftp nf_conntrack_ftp iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack ip_tables x_tables snd_hrtimer ctr ccm bnep rfcomm binfmt_misc nvidia(POF) snd_hda_codec_hdmi uvcvideo videobuf2_vmalloc snd_hda_codec_realtek videobuf2_memops videobuf2_core snd_hda_intel videodev snd_hda_codec intel_rapl x86_pkg_temp_thermal intel_powerclamp snd_hwdep coretemp mxm_wmi snd_pcm kvm_intel kvm snd_page_alloc arc4 ath9k snd_seq_midi crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_seq_midi_event ath9k_common ath9k_hw snd_rawmidi aesni_intel ath ath3k btusb snd_seq drm mac80211 snd_seq_device cfg80211 bluetooth aes_x86_64 snd_timer lrw gf128mul video snd joydev mac_hid lpc_ich wmi mei_me soundcore mei sony_laptop glue_helper serio_raw ablk_helper cryptd parport_pc ppdev lp parport hid_generic usbhid hid psmouse firewire_ohci r8169 ahci sdhci_pci firewire_core libahci mii sdhci crc_itu_t
[ 2774.388969] CPU: 0 PID: 4322 Comm: kworker/u32:1 Tainted: PF       W  O 3.13.0-32-generic #57-Ubuntu
[ 2774.388972] Hardware name: Sony Corporation VPCF23S1R/VAIO, BIOS R2150V3 07/22/2011
[ 2774.388984] Workqueue: phy0 ieee80211_iface_work [mac80211]
[ 2774.388986]  0000000000000009 ffff88009fd11ca8 ffffffff8171bcb4 0000000000000000
[ 2774.388989]  ffff88009fd11ce0 ffffffff810676cd ffff8801a5c79000 ffff8800c8b10600
[ 2774.388992]  00000000ffffffea ffff8801a5c79630 ffff8801a1abc000 ffff88009fd11cf0
[ 2774.388995] Call Trace:
[ 2774.389002]  [<ffffffff8171bcb4>] dump_stack+0x45/0x56
[ 2774.389006]  [<ffffffff810676cd>] warn_slowpath_common+0x7d/0xa0
[ 2774.389009]  [<ffffffff810677aa>] warn_slowpath_null+0x1a/0x20
[ 2774.389020]  [<ffffffffa0318067>] sta_info_insert_rcu+0xb7/0xe0 [mac80211]
[ 2774.389032]  [<ffffffffa0322eb5>] ieee80211_ibss_finish_sta+0x135/0x260 [mac80211]
[ 2774.389044]  [<ffffffffa032569b>] ieee80211_ibss_work+0xab/0x530 [mac80211]
[ 2774.389056]  [<ffffffffa0326bc6>] ieee80211_iface_work+0x1a6/0x360 [mac80211]
[ 2774.389060]  [<ffffffff810838f2>] process_one_work+0x182/0x450
[ 2774.389063]  [<ffffffff810846e1>] worker_thread+0x121/0x410
[ 2774.389066]  [<ffffffff810845c0>] ? rescuer_thread+0x430/0x430
[ 2774.389069]  [<ffffffff8108b3d2>] kthread+0xd2/0xf0
[ 2774.389072]  [<ffffffff8108b300>] ? kthread_create_on_node+0x1d0/0x1d0
[ 2774.389076]  [<ffffffff8172c5bc>] ret_from_fork+0x7c/0xb0
[ 2774.389079]  [<ffffffff8108b300>] ? kthread_create_on_node+0x1d0/0x1d0
[ 2774.389081] ---[ end trace 01b356ca4483a6eb ]---


Reported from: http://developer.ubuntu.com/?page_id=

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
network / create hotspot fail
https://bugs.launchpad.net/bugs/1355066
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