Crash with 4.8-rc6 + time shift

Prepare for kernel 4.8.5 which was released today.

I hope that this one cures all the problems you have with the 4.8 series…
4.8 works for me since 4.8.4.

@thegreg @philm
I tried the kernel 4.8.4-1 just to see.
and I have the same error than you. it boot. but after the kde splash screen it block.
with the error I think I found the problem. that seems related with the broadcom wl drivers.
I uninstalled linux48-broadcom-wl and the system boot fine wihout any problems.

just to refresh here is the error:

28.10.16 23:16    kernel    BUG: unable to handle kernel NULL pointer dereference at           (null)
28.10.16 23:16    kernel    IP: [<ffffffffa079f0b4>] cfg80211_scan_done+0x34/0x110 [cfg80211]
28.10.16 23:16    kernel    PGD 0 
28.10.16 23:16    kernel    Oops: 0000 [#1] PREEMPT SMP
28.10.16 23:16    kernel    Modules linked in: btusb btrtl btbcm btintel bluetooth hid_generic hid_logitech_hidpp input_leds uas uvcvideo mousedev hid_logitech_dj hid_apple hid_appleir videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core bcm5974 videodev usbhid media hid usb_storage snd_hda_codec_hdmi joydev nls_iso8859_1 nls_cp437 vfat fat wl(O) iTCO_wdt iTCO_vendor_support intel_powerclamp coretemp kvm_intel applesmc led_class input_polldev kvm irqbypass crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd intel_cstate snd_hda_codec_cirrus i2c_i801 cfg80211 intel_ips i2c_smbus snd_hda_codec_generic tg3 ptp pps_core snd_hda_intel sbs i915 libphy rfkill battery snd_hda_codec sbshc acpi_als snd_hda_core kfifo_buf apple_gmux industrialio
28.10.16 23:16    kernel     apple_bl snd_hwdep fjes snd_pcm evdev snd_timer snd soundcore ac acpi_cpufreq mac_hid lpc_ich intel_agp tpm_tis tpm_tis_core intel_gtt shpchp tpm sch_fq_codel pci_stub vboxpci(O) vboxnetflt(O) vboxnetadp(O) vboxdrv(O) ip_tables x_tables ext4 crc16 jbd2 fscrypto mbcache sr_mod cdrom sd_mod uhci_hcd ahci libahci libata scsi_mod ehci_pci firewire_ohci ehci_hcd firewire_core crc_itu_t usbcore usb_common nouveau button video mxm_wmi wmi i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm
28.10.16 23:16    kernel    CPU: 2 PID: 352 Comm: wl_event_handle Tainted: G           O    4.8.4-1-MANJARO #1
28.10.16 23:16    kernel    Hardware name: Apple Inc. MacBookPro6,2/Mac-F22586C8, BIOS    MBP61.88Z.0057.B11.1509232013 09/23/15
28.10.16 23:16    kernel    task: ffff8802449b4e00 task.stack: ffff88023d178000
28.10.16 23:16    kernel    RIP: 0010:[<ffffffffa079f0b4>]  [<ffffffffa079f0b4>] cfg80211_scan_done+0x34/0x110 [cfg80211]
28.10.16 23:16    kernel    RSP: 0018:ffff88023d17be08  EFLAGS: 00010246
28.10.16 23:16    kernel    RAX: 0000000000000016 RBX: ffff88023c01d700 RCX: ffffea0008bfcb20
28.10.16 23:16    kernel    RDX: ffff88023c01d2a0 RSI: 0000000000000000 RDI: ffff88023d1f1000
28.10.16 23:16    kernel    RBP: ffff88023d17be20 R08: 0000000000000001 R09: ffffffffa0d295c0
28.10.16 23:16    kernel    R10: dead000000000200 R11: dead000000000100 R12: ffff88023d1f1000
28.10.16 23:16    kernel    R13: 0000000000000000 R14: 0000000000000016 R15: ffff88023646400c
28.10.16 23:16    kernel    FS:  0000000000000000(0000) GS:ffff88024fc80000(0000) knlGS:0000000000000000
28.10.16 23:16    kernel    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
28.10.16 23:16    kernel    CR2: 0000000000000000 CR3: 0000000002a06000 CR4: 00000000000006e0
28.10.16 23:16    kernel    Stack:
28.10.16 23:16    kernel     ffff88023c01d700 ffff880236466128 0000000000000000 ffff88023d17be78
28.10.16 23:16    kernel     ffffffffa0d29f2c ffff88023c01d700 000000013c01df20 0000000000000001
28.10.16 23:16    kernel     00000000c2affc8a ffff88023c01d700 ffff88023c01db08 ffff88023c331780
28.10.16 23:16    kernel    Call Trace:
28.10.16 23:16    kernel     [<ffffffffa0d29f2c>] wl_notify_scan_status+0x7c/0x320 [wl]
28.10.16 23:16    kernel     [<ffffffffa0d2660c>] wl_event_handler+0x7c/0x1e0 [wl]
28.10.16 23:16    kernel     [<ffffffffa0d26590>] ? wl_deinit_priv_mem+0xa0/0xa0 [wl]
28.10.16 23:16    kernel     [<ffffffff8109be38>] kthread+0xd8/0xf0
28.10.16 23:16    kernel     [<ffffffff8102c782>] ? __switch_to+0x2d2/0x630
28.10.16 23:16    kernel     [<ffffffff8160beff>] ret_from_fork+0x1f/0x40
28.10.16 23:16    kernel     [<ffffffff8109bd60>] ? kthread_worker_fn+0x170/0x170
28.10.16 23:16    kernel    Code: 41 55 41 54 49 89 f5 53 49 89 fc 66 66 66 66 90 49 8b 54 24 60 48 85 d2 0f 84 d9 00 00 00 4c 3b a2 78 fe ff ff 0f 85 92 00 00 00 <49> 8b 45 00 49 89 44 24 70 49 8b 45 08 41 c6 84 24 80 00 00 00 
28.10.16 23:16    kernel    RIP  [<ffffffffa079f0b4>] cfg80211_scan_done+0x34/0x110 [cfg80211]
28.10.16 23:16    kernel     RSP <ffff88023d17be08>
28.10.16 23:16    kernel    CR2: 0000000000000000
28.10.16 23:16    kernel    ---[ end trace a93ba2399f45bef9 ]---
28.10.16 23:16    kernel    BUG: unable to handle kernel paging request at 00000000c2affc8a
28.10.16 23:16    kernel    IP: [<ffffffff810bfd1b>] __wake_up_common+0x2b/0x80
28.10.16 23:16    kernel    PGD 0 
28.10.16 23:16    kernel    Oops: 0000 [#2] PREEMPT SMP
28.10.16 23:16    kernel    Modules linked in: btusb btrtl btbcm btintel bluetooth hid_generic hid_logitech_hidpp input_leds uas uvcvideo mousedev hid_logitech_dj hid_apple hid_appleir videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core bcm5974 videodev usbhid media hid usb_storage snd_hda_codec_hdmi joydev nls_iso8859_1 nls_cp437 vfat fat wl(O) iTCO_wdt iTCO_vendor_support intel_powerclamp coretemp kvm_intel applesmc led_class input_polldev kvm irqbypass crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd intel_cstate snd_hda_codec_cirrus i2c_i801 cfg80211 intel_ips i2c_smbus snd_hda_codec_generic tg3 ptp pps_core snd_hda_intel sbs i915 libphy rfkill battery snd_hda_codec sbshc acpi_als snd_hda_core kfifo_buf apple_gmux industrialio
28.10.16 23:16    kernel     apple_bl snd_hwdep fjes snd_pcm evdev snd_timer snd soundcore ac acpi_cpufreq mac_hid lpc_ich intel_agp tpm_tis tpm_tis_core intel_gtt shpchp tpm sch_fq_codel pci_stub vboxpci(O) vboxnetflt(O) vboxnetadp(O) vboxdrv(O) ip_tables x_tables ext4 crc16 jbd2 fscrypto mbcache sr_mod cdrom sd_mod uhci_hcd ahci libahci libata scsi_mod ehci_pci firewire_ohci ehci_hcd firewire_core crc_itu_t usbcore usb_common nouveau button video mxm_wmi wmi i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm
28.10.16 23:16    kernel    CPU: 2 PID: 352 Comm: wl_event_handle Tainted: G      D    O    4.8.4-1-MANJARO #1
28.10.16 23:16    kernel    Hardware name: Apple Inc. MacBookPro6,2/Mac-F22586C8, BIOS    MBP61.88Z.0057.B11.1509232013 09/23/15
28.10.16 23:16    kernel    task: ffff8802449b4e00 task.stack: ffff88023d178000
28.10.16 23:16    kernel    RIP: 0010:[<ffffffff810bfd1b>]  [<ffffffff810bfd1b>] __wake_up_common+0x2b/0x80
28.10.16 23:16    kernel    RSP: 0018:ffff88023d17be40  EFLAGS: 00010096
28.10.16 23:16    kernel    RAX: 0000000000000282 RBX: ffff88023d17bf10 RCX: 0000000000000000
28.10.16 23:16    kernel    RDX: 00000000c2affc8a RSI: 0000000000000003 RDI: ffff88023d17bf10
28.10.16 23:16    kernel    RBP: ffff88023d17be78 R08: 0000000000000000 R09: 6120656361727420
28.10.16 23:16    kernel    R10: 0000000000000000 R11: 00000000000003fb R12: ffff88023d17bf18
28.10.16 23:16    kernel    R13: 0000000000000282 R14: 0000000000000000 R15: 0000000000000003
28.10.16 23:16    kernel    FS:  0000000000000000(0000) GS:ffff88024fc80000(0000) knlGS:0000000000000000
28.10.16 23:16    kernel    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
28.10.16 23:16    kernel    CR2: 00000000c2affc8a CR3: 0000000002a06000 CR4: 00000000000006e0
28.10.16 23:16    kernel    Stack:
28.10.16 23:16    kernel     0000000100000000 0000000000000000 ffff88023d17bf10 ffff88023d17bf08
28.10.16 23:16    kernel     0000000000000282 0000000000000000 ffff8802449b4e00 ffff88023d17be88
28.10.16 23:16    kernel     ffffffff810bfdd3 ffff88023d17beb0 ffffffff810c0827 ffff8802449b5510
28.10.16 23:16    kernel    Call Trace:
28.10.16 23:16    kernel     [<ffffffff810bfdd3>] __wake_up_locked+0x13/0x20
28.10.16 23:16    kernel     [<ffffffff810c0827>] complete+0x37/0x50
28.10.16 23:16    kernel     [<ffffffff81079eef>] mm_release+0xbf/0x140
28.10.16 23:16    kernel     [<ffffffff81080bcf>] do_exit+0x7af/0xb50
28.10.16 23:16    kernel     [<ffffffff8160d497>] rewind_stack_do_exit+0x17/0x20
28.10.16 23:16    kernel     [<ffffffff8109bd60>] ? kthread_worker_fn+0x170/0x170
28.10.16 23:16    kernel    Code: 66 66 66 66 90 55 48 89 e5 41 57 41 56 41 55 41 54 4c 8d 67 08 53 41 89 f7 48 83 ec 10 89 55 cc 48 8b 57 08 4c 89 45 d0 49 39 d4 <48> 8b 32 74 40 48 8d 42 e8 4c 8d 6e e8 41 89 ce 8b 18 48 8b 4d 
28.10.16 23:16    kernel    RIP  [<ffffffff810bfd1b>] __wake_up_common+0x2b/0x80
28.10.16 23:16    kernel     RSP <ffff88023d17be40>
28.10.16 23:16    kernel    CR2: 00000000c2affc8a
28.10.16 23:16    kernel    ---[ end trace a93ba2399f45befa ]---
28.10.16 23:16    kernel    Fixing recursive fault but reboot is needed!
28.10.16 23:16    kernel    BUG: scheduling while atomic: wl_event_handle/352/0x00000003
28.10.16 23:16    kernel    Modules linked in: btusb btrtl btbcm btintel bluetooth hid_generic hid_logitech_hidpp input_leds uas uvcvideo mousedev hid_logitech_dj hid_apple hid_appleir videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core bcm5974 videodev usbhid media hid usb_storage snd_hda_codec_hdmi joydev nls_iso8859_1 nls_cp437 vfat fat wl(O) iTCO_wdt iTCO_vendor_support intel_powerclamp coretemp kvm_intel applesmc led_class input_polldev kvm irqbypass crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd intel_cstate snd_hda_codec_cirrus i2c_i801 cfg80211 intel_ips i2c_smbus snd_hda_codec_generic tg3 ptp pps_core snd_hda_intel sbs i915 libphy rfkill battery snd_hda_codec sbshc acpi_als snd_hda_core kfifo_buf apple_gmux industrialio
28.10.16 23:16    kernel     apple_bl snd_hwdep fjes snd_pcm evdev snd_timer snd soundcore ac acpi_cpufreq mac_hid lpc_ich intel_agp tpm_tis tpm_tis_core intel_gtt shpchp tpm sch_fq_codel pci_stub vboxpci(O) vboxnetflt(O) vboxnetadp(O) vboxdrv(O) ip_tables x_tables ext4 crc16 jbd2 fscrypto mbcache sr_mod cdrom sd_mod uhci_hcd ahci libahci libata scsi_mod ehci_pci firewire_ohci ehci_hcd firewire_core crc_itu_t usbcore usb_common nouveau button video mxm_wmi wmi i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm
28.10.16 23:16    kernel    CPU: 2 PID: 352 Comm: wl_event_handle Tainted: G      D    O    4.8.4-1-MANJARO #1
28.10.16 23:16    kernel    Hardware name: Apple Inc. MacBookPro6,2/Mac-F22586C8, BIOS    MBP61.88Z.0057.B11.1509232013 09/23/15
28.10.16 23:16    kernel     0000000000000086 00000000c2affc8a ffff88023d17be50 ffffffff81312330
28.10.16 23:16    kernel     ffff88024fc97f80 0000000000000009 ffff88023d17be60 ffffffff810a3434
28.10.16 23:16    kernel     ffff88023d17beb8 ffffffff81607bc0 00ffffff811760fd ffff880200000008
28.10.16 23:16    kernel    Call Trace:
28.10.16 23:16    kernel     [<ffffffff81312330>] dump_stack+0x63/0x83
28.10.16 23:16    kernel     [<ffffffff810a3434>] __schedule_bug+0x54/0x70
28.10.16 23:16    kernel     [<ffffffff81607bc0>] __schedule+0x600/0x780
28.10.16 23:16    kernel     [<ffffffff81607d7c>] schedule+0x3c/0x90
28.10.16 23:16    kernel     [<ffffffff81080d59>] do_exit+0x939/0xb50
28.10.16 23:16    kernel     [<ffffffff8160d497>] rewind_stack_do_exit+0x17/0x20
28.10.16 23:16    kernel     [<ffffffff8109bd60>] ? kthread_worker_fn+0x170/0x170

EDIT:
@philm
it seems they say on broadcom-wl-dkms AUR package that the kernel 4.8 need the broadcom wl driver v6.30.223.271-10 to fix the issue with cfg80211_scan_done() usage

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=839629

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