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 ]---
---
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: hinkokocevar 1918 F.... pulseaudio
/dev/snd/controlC0: hinkokocevar 1918 F.... pulseaudio
/dev/snd/controlC1: hinkokocevar 1918 F.... pulseaudio
CurrentDesktop: XFCE
DistroRelease: Ubuntu 15.10
HibernationDevice: RESUME=UUID=21e13044-6484-46f2-aa2c-256b7f158491
MachineType: Apple Inc. MacBookPro11,2
NonfreeKernelModules: wl
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-27-generic.efi.signed root=UUID=e9920a54-14db-4634-b582-54432674a4ef ro noprompt persistent libata.force=noncq elevator=noop quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.2.0-27.32-generic 4.2.8-ckt1
RelatedPackageVersions:
linux-restricted-modules-4.2.0-27-generic N/A
linux-backports-modules-4.2.0-27-generic N/A
linux-firmware 1.149.3
RfKill: Can't open RFKILL control device: Permission denied
Tags: wily
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
Uname: Linux 4.2.0-27-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers
_MarkForUpload: True
dmi.bios.date: 09/08/2015
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP112.88Z.0138.B16.1509081314
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-3CBD00234E554E41
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro11,2
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-3CBD00234E554E41
dmi.modalias: dmi:bvnAppleInc.:bvrMBP112.88Z.0138.B16.1509081314:bd09/08/2015:svnAppleInc.:pnMacBookPro11,2:pvr1.0:rvnAppleInc.:rnMac-3CBD00234E554E41:rvrMacBookPro11,2:cvnAppleInc.:ct10:cvrMac-3CBD00234E554E41:
dmi.product.name: MacBookPro11,2
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:
apport-collect 1551148
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.