Hello.

Trying to collect the trace, I got the following kernel trace appearing repeatedly in the system logs:

Jun  8 20:47:56 saguti-laptop kernel: [  227.846542] ------------[ cut here ]------------
Jun  8 20:47:56 saguti-laptop kernel: [  227.846567] WARNING: CPU: 2 PID: 135 at /home/kernel/COD/linux/drivers/net/wireless/ath/ath9k/hw.c:2776 ath9k_hw_gpio_get+0x161/0x1b0 [ath9k_hw]
Jun  8 20:47:56 saguti-laptop kernel: [  227.846569] Modules linked in: rfcomm fuse drbg ansi_cprng ctr ccm cpufreq_userspace cpufreq_ondemand cpufreq_powersave bnep cpufreq_conservative binfmt_misc nls_iso8859_1 vfat fat uvcvideo videobuf2_vmalloc ath3k videobuf2_memops videobuf2_v4l2 videobuf2_core videodev btusb btrtl btbcm btintel media bluetooth x86_pkg_temp_thermal nvram intel_powerclamp msr kvm_intel kvm arc4 acer_wmi irqbypass sparse_keymap ath9k joydev ath9k_common hid_multitouch ath9k_hw crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_hdmi ath mac80211 aesni_intel aes_x86_64 lrw input_leds cfg80211 snd_hda_codec_realtek gf128mul snd_hda_codec_generic snd_hda_intel glue_helper snd_hda_codec ablk_helper snd_hda_core snd_hwdep cryptd snd_pcm serio_raw snd_seq_midi snd_seq_midi_event sg snd_rawmidi snd_seq snd_seq_device snd_timer dw_dmac dw_dmac_core battery 8250_dw mei_me mei snd mac_hid spi_pxa2xx_platform ac i2c_designware_platform soundcore i2c_designware_core shpchp lpc_ich coretemp parport_pc ppdev lp parport autofs4 dm_mod sr_mod cdrom sd_mod hid_generic usbhid i915 ahci libahci crc32c_intel libata i2c_algo_bit drm_kms_helper syscopyarea xhci_pci ehci_pci sysfillrect r8169 xhci_hcd sysimgblt fb_sys_fops ehci_hcd mii drm thermal scsi_mod usbcore intel_gtt agpgart usb_common sdhci_acpi wmi sdhci i2c_hid fjes video led_class hid button
Jun  8 20:47:56 saguti-laptop kernel: [  227.846641] CPU: 2 PID: 135 Comm: kworker/u16:3 Tainted: G        W       4.7.0-040700rc2-generic #201606051831
Jun  8 20:47:56 saguti-laptop kernel: [  227.846643] Hardware name: Acer Aspire V3-472G/EA40_HB, BIOS V1.21 09/24/2014
Jun  8 20:47:56 saguti-laptop kernel: [  227.846647] Workqueue: events_power_efficient rfkill_poll
Jun  8 20:47:56 saguti-laptop kernel: [  227.846649]  0000000000000286 00000000fc97a9fd ffff88003539fd28 ffffffff813c88a3
Jun  8 20:47:56 saguti-laptop kernel: [  227.846651]  0000000000000000 0000000000000000 ffff88003539fd68 ffffffff8108089b
Jun  8 20:47:56 saguti-laptop kernel: [  227.846654]  00000ad8fc97a9fd ffff88025274c018 000000000000000b ffff880252de0720
Jun  8 20:47:56 saguti-laptop kernel: [  227.846656] Call Trace:
Jun  8 20:47:56 saguti-laptop kernel: [  227.846662]  [<ffffffff813c88a3>] dump_stack+0x63/0x90
Jun  8 20:47:56 saguti-laptop kernel: [  227.846665]  [<ffffffff8108089b>] __warn+0xcb/0xf0
Jun  8 20:47:56 saguti-laptop kernel: [  227.846667]  [<ffffffff810809cd>] warn_slowpath_null+0x1d/0x20
Jun  8 20:47:56 saguti-laptop kernel: [  227.846674]  [<ffffffffc07ee311>] ath9k_hw_gpio_get+0x161/0x1b0 [ath9k_hw]
Jun  8 20:47:56 saguti-laptop kernel: [  227.846679]  [<ffffffffc06b6553>] ath9k_rfkill_poll_state+0x33/0x60 [ath9k]
Jun  8 20:47:56 saguti-laptop kernel: [  227.846699]  [<ffffffffc07500b3>] ieee80211_rfkill_poll+0x33/0x40 [mac80211]
Jun  8 20:47:56 saguti-laptop kernel: [  227.846711]  [<ffffffffc05bb9fa>] cfg80211_rfkill_poll+0x2a/0xc0 [cfg80211]
Jun  8 20:47:56 saguti-laptop kernel: [  227.846713]  [<ffffffff817056f4>] rfkill_poll+0x24/0x50
Jun  8 20:47:56 saguti-laptop kernel: [  227.846716]  [<ffffffff8109a767>] process_one_work+0x167/0x470
Jun  8 20:47:56 saguti-laptop kernel: [  227.846718]  [<ffffffff8109aabb>] worker_thread+0x4b/0x4f0
Jun  8 20:47:56 saguti-laptop kernel: [  227.846721]  [<ffffffff8109aa70>] ? process_one_work+0x470/0x470
Jun  8 20:47:56 saguti-laptop kernel: [  227.846724]  [<ffffffff810a1178>] kthread+0xd8/0xf0
Jun  8 20:47:56 saguti-laptop kernel: [  227.846727]  [<ffffffff81719f5f>] ret_from_fork+0x1f/0x40
Jun  8 20:47:56 saguti-laptop kernel: [  227.846730]  [<ffffffff810a10a0>] ? kthread_create_on_node+0x1c0/0x1c0
Jun  8 20:47:56 saguti-laptop kernel: [  227.846732] ---[ end trace a452da9b1d5c6333 ]---
Jun  8 20:47:56 saguti-laptop kernel: [  227.846733] ------------[ cut here ]------------
Jun  8 20:47:56 saguti-laptop kernel: [  227.846740] WARNING: CPU: 2 PID: 135 at /home/kernel/COD/linux/drivers/net/wireless/ath/ath9k/hw.c:2796 ath9k_hw_gpio_get+0xc0/0x1b0 [ath9k_hw]
Jun  8 20:47:56 saguti-laptop kernel: [  227.846741] Modules linked in: rfcomm fuse drbg ansi_cprng ctr ccm cpufreq_userspace cpufreq_ondemand cpufreq_powersave bnep cpufreq_conservative binfmt_misc nls_iso8859_1 vfat fat uvcvideo videobuf2_vmalloc ath3k videobuf2_memops videobuf2_v4l2 videobuf2_core videodev btusb btrtl btbcm btintel media bluetooth x86_pkg_temp_thermal nvram intel_powerclamp msr kvm_intel kvm arc4 acer_wmi irqbypass sparse_keymap ath9k joydev ath9k_common hid_multitouch ath9k_hw crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_hdmi ath mac80211 aesni_intel aes_x86_64 lrw input_leds cfg80211 snd_hda_codec_realtek gf128mul snd_hda_codec_generic snd_hda_intel glue_helper snd_hda_codec ablk_helper snd_hda_core snd_hwdep cryptd snd_pcm serio_raw snd_seq_midi snd_seq_midi_event sg snd_rawmidi snd_seq snd_seq_device snd_timer dw_dmac dw_dmac_core battery 8250_dw mei_me mei snd mac_hid spi_pxa2xx_platform ac i2c_designware_platform soundcore i2c_designware_core shpchp lpc_ich coretemp parport_pc ppdev lp parport autofs4 dm_mod sr_mod cdrom sd_mod hid_generic usbhid i915 ahci libahci crc32c_intel libata i2c_algo_bit drm_kms_helper syscopyarea xhci_pci ehci_pci sysfillrect r8169 xhci_hcd sysimgblt fb_sys_fops ehci_hcd mii drm thermal scsi_mod usbcore intel_gtt agpgart usb_common sdhci_acpi wmi sdhci i2c_hid fjes video led_class hid button
Jun  8 20:47:56 saguti-laptop kernel: [  227.846792] CPU: 2 PID: 135 Comm: kworker/u16:3 Tainted: G        W       4.7.0-040700rc2-generic #201606051831
Jun  8 20:47:56 saguti-laptop kernel: [  227.846793] Hardware name: Acer Aspire V3-472G/EA40_HB, BIOS V1.21 09/24/2014
Jun  8 20:47:56 saguti-laptop kernel: [  227.846796] Workqueue: events_power_efficient rfkill_poll
Jun  8 20:47:56 saguti-laptop kernel: [  227.846797]  0000000000000286 00000000fc97a9fd ffff88003539fd28 ffffffff813c88a3
Jun  8 20:47:56 saguti-laptop kernel: [  227.846799]  0000000000000000 0000000000000000 ffff88003539fd68 ffffffff8108089b
Jun  8 20:47:56 saguti-laptop kernel: [  227.846801]  00000aecfc97a9fd ffff88025274c018 000000000000000b ffff880252de0720
Jun  8 20:47:56 saguti-laptop kernel: [  227.846803] Call Trace:
Jun  8 20:47:56 saguti-laptop kernel: [  227.846806]  [<ffffffff813c88a3>] dump_stack+0x63/0x90
Jun  8 20:47:56 saguti-laptop kernel: [  227.846808]  [<ffffffff8108089b>] __warn+0xcb/0xf0
Jun  8 20:47:56 saguti-laptop kernel: [  227.846810]  [<ffffffff810809cd>] warn_slowpath_null+0x1d/0x20
Jun  8 20:47:56 saguti-laptop kernel: [  227.846816]  [<ffffffffc07ee270>] ath9k_hw_gpio_get+0xc0/0x1b0 [ath9k_hw]
Jun  8 20:47:56 saguti-laptop kernel: [  227.846820]  [<ffffffffc06b6553>] ath9k_rfkill_poll_state+0x33/0x60 [ath9k]
Jun  8 20:47:56 saguti-laptop kernel: [  227.846835]  [<ffffffffc07500b3>] ieee80211_rfkill_poll+0x33/0x40 [mac80211]
Jun  8 20:47:56 saguti-laptop kernel: [  227.846845]  [<ffffffffc05bb9fa>] cfg80211_rfkill_poll+0x2a/0xc0 [cfg80211]
Jun  8 20:47:56 saguti-laptop kernel: [  227.846848]  [<ffffffff817056f4>] rfkill_poll+0x24/0x50
Jun  8 20:47:56 saguti-laptop kernel: [  227.846850]  [<ffffffff8109a767>] process_one_work+0x167/0x470
Jun  8 20:47:56 saguti-laptop kernel: [  227.846852]  [<ffffffff8109aabb>] worker_thread+0x4b/0x4f0
Jun  8 20:47:56 saguti-laptop kernel: [  227.846854]  [<ffffffff8109aa70>] ? process_one_work+0x470/0x470
Jun  8 20:47:56 saguti-laptop kernel: [  227.846857]  [<ffffffff810a1178>] kthread+0xd8/0xf0
Jun  8 20:47:56 saguti-laptop kernel: [  227.846860]  [<ffffffff81719f5f>] ret_from_fork+0x1f/0x40
Jun  8 20:47:56 saguti-laptop kernel: [  227.846863]  [<ffffffff810a10a0>] ? kthread_create_on_node+0x1c0/0x1c0
Jun  8 20:47:56 saguti-laptop kernel: [  227.846864] ---[ end trace a452da9b1d5c6334 ]---

How should I proceed?