Comment 34 for bug 1159306

Happened to me in saucy as well.

------------[ cut here ]------------
 WARNING: CPU: 2 PID: 502 at /build/buildd/linux-3.11.0/net/wireless/sme.c:795 cfg80211_roamed+0x89/0x90 [cfg80211]()
 Modules linked in: hid_generic usbhid hid snd_hrtimer cuse parport_pc ppdev bnep rfcomm bluetooth x86_pkg_temp_thermal intel_powerclamp coretemp joydev kvm_intel kvm uvcvideo crct10dif_pclmul lib80211_crypt_tkip crc32_pclmul ghash_clmulni_intel snd_hda_codec_hdmi snd_hda_codec_realtek cryptd videobuf2_vmalloc videobuf2_memops videobuf2_core wl(POF) snd_hda_intel videodev snd_hda_codec thinkpad_acpi snd_hwdep snd_pcm nvram snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer lib80211 snd cfg80211 psmouse soundcore lp rtsx_pci_ms memstick mac_hid mei_me wmi serio_raw mei lpc_ich microcode parport rtsx_pci_sdmmc i915 ahci libahci i2c_algo_bit rtsx_pci drm_kms_helper r8169 mii drm video
CPU: 2 PID: 502 Comm: wl_event_handle Tainted: PF W O 3.11.0-20-generic-tuxonice #35~ppa1-Ubuntu
 Hardware name: LENOVO 34641K7/34641K7, BIOS H2ET66WW(1.66) 12/05/2012
  0000000000000009 ffff880102df9d88 ffffffff816fe00e 0000000000000000
  ffff880102df9dc0 ffffffff81061e2d ffff88011675d000 ffff88008965c200
  0000000000000035 ffff880007f3dba0 0000000000000001 ffff880102df9dd0
 Call Trace:
  [<ffffffff816fe00e>] dump_stack+0x45/0x56
  [<ffffffff81061e2d>] warn_slowpath_common+0x7d/0xa0
  [<ffffffff81061f0a>] warn_slowpath_null+0x1a/0x20
  [<ffffffffa0263429>] cfg80211_roamed+0x89/0x90 [cfg80211]
  [<ffffffffa04854c5>] wl_bss_connect_done.isra.21+0x105/0x1b0 [wl]
  [<ffffffffa0485774>] wl_notify_connect_status+0x204/0x420 [wl]
  [<ffffffffa0484a95>] wl_event_handler+0x55/0x1f0 [wl]
  [<ffffffffa0484a40>] ? wl_cfg80211_scan+0x380/0x380 [wl]
  [<ffffffff810848f0>] kthread+0xc0/0xd0
  [<ffffffff81084830>] ? kthread_create_on_node+0x120/0x120
  [<ffffffff8170ddec>] ret_from_fork+0x7c/0xb0
  [<ffffffff81084830>] ? kthread_create_on_node+0x120/0x120
 ---[ end trace 47c021048dc4f1c3 ]---

Broadcom Wireless Driver: bcmwl-kernel-source_6.20.155.1+bdcom-0ubuntu6_amd64