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I keep seeing these in the syslog:

Feb 29 10:52:22 hinkocmbp kernel: [1017930.886865] ------------[ cut here ]------------
Feb 29 10:52:22 hinkocmbp kernel: [1017930.886888] WARNING: CPU: 0 PID: 414 at /build/linux-NgsOGa/linux-4.2.0/net/wireless/sme.c:850 cfg80211_roamed+0x86/0xa0 [cfg80211]()
Feb 29 10:52:22 hinkocmbp kernel: [1017930.886890] Modules linked in: acpi_ipmi ipmi_devintf ipmi_msghandler btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace arc4 md4 nls_utf8 cifs fscache nvram msr rfcomm pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) bnep btusb btrtl btbcm btintel bluetooth vboxdrv(OE) binfmt_misc uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media snd_usb_audio snd_usbmidi_lib input_leds joydev bcm5974 applesmc input_polldev nls_iso8859_1 snd_hda_codec_hdmi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd snd_hda_codec_cirrus snd_hda_codec_generic wl(POE) snd_hda_intel snd_hda_codec cfg80211 snd_hda_core snd_seq_midi lpc_ich snd_seq_midi_event snd_hwdep bdc_pci snd_rawmidi snd_pcm snd_seq mei_me snd_seq_device mei snd_timer snd soundcore thunderbolt shpchp sbs acpi_als kfifo_buf sbshc industrialio apple_gmux mac_hid apple_bl parport_pc ppdev sunrpc lp parport autofs4 hid_logitech_hidpp hid_logitech_dj hid_apple hid_generic usbhid hid i915 i2c_algo_bit drm_kms_helper uas ahci drm libahci usb_storage firewire_ohci tg3 firewire_core ptp crc_itu_t pps_core video [last unloaded: ipmi_si]
Feb 29 10:52:22 hinkocmbp kernel: [1017930.886959] CPU: 0 PID: 414 Comm: wl_event_handle Tainted: P        W  OE   4.2.0-27-generic #32-Ubuntu
Feb 29 10:52:22 hinkocmbp kernel: [1017930.886960] Hardware name: Apple Inc. MacBookPro11,2/Mac-3CBD00234E554E41, BIOS MBP112.88Z.0138.B16.1509081314 09/08/2015
Feb 29 10:52:22 hinkocmbp kernel: [1017930.886962]  0000000000000000 00000000586b797e ffff8804686a7da8 ffffffff817eae99
Feb 29 10:52:22 hinkocmbp kernel: [1017930.886964]  0000000000000000 0000000000000000 ffff8804686a7de8 ffffffff8107b9c6
Feb 29 10:52:22 hinkocmbp kernel: [1017930.886966]  ffff8804680e4078 ffff88046b8ca000 ffff880206fac9c0 00000000000000a4
Feb 29 10:52:22 hinkocmbp kernel: [1017930.886968] Call Trace:
Feb 29 10:52:22 hinkocmbp kernel: [1017930.886973]  [<ffffffff817eae99>] dump_stack+0x45/0x57
Feb 29 10:52:22 hinkocmbp kernel: [1017930.886977]  [<ffffffff8107b9c6>] warn_slowpath_common+0x86/0xc0
Feb 29 10:52:22 hinkocmbp kernel: [1017930.886979]  [<ffffffff8107bafa>] warn_slowpath_null+0x1a/0x20
Feb 29 10:52:22 hinkocmbp kernel: [1017930.886989]  [<ffffffffc047a5d6>] cfg80211_roamed+0x86/0xa0 [cfg80211]
Feb 29 10:52:22 hinkocmbp kernel: [1017930.887016]  [<ffffffffc0708965>] wl_notify_roaming_status+0xc5/0x140 [wl]
Feb 29 10:52:22 hinkocmbp kernel: [1017930.887038]  [<ffffffffc0707fa4>] wl_event_handler+0x64/0x1e0 [wl]
Feb 29 10:52:22 hinkocmbp kernel: [1017930.887059]  [<ffffffffc0707f40>] ? wl_notify_scan_status+0x320/0x320 [wl]
Feb 29 10:52:22 hinkocmbp kernel: [1017930.887062]  [<ffffffff8109ae38>] kthread+0xd8/0xf0
Feb 29 10:52:22 hinkocmbp kernel: [1017930.887064]  [<ffffffff8109ad60>] ? kthread_create_on_node+0x1f0/0x1f0
Feb 29 10:52:22 hinkocmbp kernel: [1017930.887066]  [<ffffffff817f209f>] ret_from_fork+0x3f/0x70
Feb 29 10:52:22 hinkocmbp kernel: [1017930.887068]  [<ffffffff8109ad60>] ? kthread_create_on_node+0x1f0/0x1f0
Feb 29 10:52:22 hinkocmbp kernel: [1017930.887069] ---[ end trace 3ae35abf2bc2cf7a ]---

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

-- 
cfg80211 kernel module crashes
https://bugs.launchpad.net/bugs/1551148
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