Hi,
Running a 4.4.0-rc6 kernel i encountered the warning below.
--
Sander
[ 13.740472] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 13.936237] iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
[ 13.945391] iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
[ 13.947434] iwlwifi 0000:03:00.0: Radio type=0x2-0x1-0x0
[ 14.223990] iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
[ 14.232065] iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
[ 14.233570] iwlwifi 0000:03:00.0: Radio type=0x2-0x1-0x0
[ 14.328141] systemd-logind[2485]: Failed to start user service:
Unknown unit: user@117.service
[ 14.356634] systemd-logind[2485]: New session c1 of user lightdm.
[ 14.357320] ------------[ cut here ]------------
[ 14.357327] WARNING: CPU: 2 PID: 102 at net/netfilter/core.c:143
netfilter_net_exit+0x25/0x50()
[ 14.357328] nf_unregister_net_hook: hook not found!
[ 14.357371] Modules linked in: iptable_security(+) iptable_raw
iptable_filter ip_tables x_tables input_polldev bnep binfmt_misc nfsd
auth_rpcgss oid_registry nfs_acl nfs lockd grace fscache sunrpc uvcvideo
videobuf2_vmalloc iTCO_wdt arc4 videobuf2_memops iTCO_vendor_support
intel_rapl iosf_mbi videobuf2_v4l2 x86_pkg_temp_thermal intel_powerclamp
btusb coretemp snd_hda_codec_hdmi iwldvm videobuf2_core btrtl kvm_intel
v4l2_common mac80211 videodev btbcm snd_hda_codec_conexant btintel media
kvm snd_hda_codec_generic bluetooth psmouse thinkpad_acpi iwlwifi
snd_hda_intel pcspkr serio_raw snd_hda_codec nvram cfg80211 snd_hwdep
snd_hda_core rfkill i2c_i801 lpc_ich snd_pcm mfd_core snd_timer evdev
snd soundcore shpchp tpm_tis tpm algif_skcipher af_alg crct10dif_pclmul
crc32_pclmul crc32c_intel aesni_intel
[ 14.357380] ehci_pci sdhci_pci aes_x86_64 glue_helper ehci_hcd
e1000e lrw ablk_helper sg sdhci cryptd sd_mod ptp mmc_core usbcore
usb_common pps_core
[ 14.357383] CPU: 2 PID: 102 Comm: kworker/u16:3 Tainted: G U
4.4.0-rc6-x220-20151224+ #1
[ 14.357384] Hardware name: LENOVO 42912ZU/42912ZU, BIOS 8DET69WW
(1.39 ) 07/18/2013
[ 14.357390] Workqueue: netns cleanup_net
[ 14.357393] ffffffff81a27dfd ffffffff81359c69 ffff88030e7cbd40
ffffffff81060297
[ 14.357395] ffff88030e820d80 ffff88030e7cbd90 ffffffff81c962d8
ffffffff81c962e0
[ 14.357397] ffff88030e7cbdf8 ffffffff81060317 ffffffff81a2c010
ffff880300000018
[ 14.357398] Call Trace:
[ 14.357405] [<ffffffff81359c69>] ? dump_stack+0x40/0x57
[ 14.357408] [<ffffffff81060297>] ? warn_slowpath_common+0x77/0xb0
[ 14.357410] [<ffffffff81060317>] ? warn_slowpath_fmt+0x47/0x50
[ 14.357416] [<ffffffff816f9549>] ? mutex_lock+0x9/0x30
[ 14.357418] [<ffffffff81641b35>] ? netfilter_net_exit+0x25/0x50
[ 14.357421] [<ffffffff8160b78e>] ? ops_exit_list.isra.6+0x2e/0x60
[ 14.357424] [<ffffffff8160c3eb>] ? cleanup_net+0x1ab/0x280
[ 14.357427] [<ffffffff81074b33>] ? process_one_work+0x133/0x330
[ 14.357429] [<ffffffff81074d90>] ? worker_thread+0x60/0x470
[ 14.357430] [<ffffffff81074d30>] ? process_one_work+0x330/0x330
[ 14.357434] [<ffffffff81079c0a>] ? kthread+0xca/0xe0
[ 14.357436] [<ffffffff81079b40>] ?
kthread_create_on_node+0x170/0x170
[ 14.357439] [<ffffffff816fb5cf>] ? ret_from_fork+0x3f/0x70
[ 14.357441] [<ffffffff81079b40>] ?
kthread_create_on_node+0x170/0x170
[ 14.357443] ---[ end trace 9984cc4b0e89f818 ]---
[ 14.357443] ------------[ cut here ]------------
[ 14.357446] WARNING: CPU: 2 PID: 102 at net/netfilter/core.c:143
netfilter_net_exit+0x25/0x50()
[ 14.357446] nf_unregister_net_hook: hook not found!
[ 14.357472] Modules linked in: iptable_security(+) iptable_raw
iptable_filter ip_tables x_tables input_polldev bnep binfmt_misc nfsd
auth_rpcgss oid_registry nfs_acl nfs lockd grace fscache sunrpc uvcvideo
videobuf2_vmalloc iTCO_wdt arc4 videobuf2_memops iTCO_vendor_support
intel_rapl iosf_mbi videobuf2_v4l2 x86_pkg_temp_thermal intel_powerclamp
btusb coretemp snd_hda_codec_hdmi iwldvm videobuf2_core btrtl kvm_intel
v4l2_common mac80211 videodev btbcm snd_hda_codec_conexant btintel media
kvm snd_hda_codec_generic bluetooth psmouse thinkpad_acpi iwlwifi
snd_hda_intel pcspkr serio_raw snd_hda_codec nvram cfg80211 snd_hwdep
snd_hda_core rfkill i2c_i801 lpc_ich snd_pcm mfd_core snd_timer evdev
snd soundcore shpchp tpm_tis tpm algif_skcipher af_alg crct10dif_pclmul
crc32_pclmul crc32c_intel aesni_intel
[ 14.357478] ehci_pci sdhci_pci aes_x86_64 glue_helper ehci_hcd
e1000e lrw ablk_helper sg sdhci cryptd sd_mod ptp mmc_core usbcore
usb_common pps_core
[ 14.357480] CPU: 2 PID: 102 Comm: kworker/u16:3 Tainted: G U W
4.4.0-rc6-x220-20151224+ #1
[ 14.357481] Hardware name: LENOVO 42912ZU/42912ZU, BIOS 8DET69WW
(1.39 ) 07/18/2013
[ 14.357484] Workqueue: netns cleanup_net
[ 14.357486] ffffffff81a27dfd ffffffff81359c69 ffff88030e7cbd40
ffffffff81060297
[ 14.357488] ffff88030e820db8 ffff88030e7cbd90 ffffffff81c962d8
ffffffff81c962e0
[ 14.357489] ffff88030e7cbdf8 ffffffff81060317 ffffffff81a2c010
ffff880300000018
[ 14.357490] Call Trace:
[ 14.357493] [<ffffffff81359c69>] ? dump_stack+0x40/0x57
[ 14.357495] [<ffffffff81060297>] ? warn_slowpath_common+0x77/0xb0
[ 14.357497] [<ffffffff81060317>] ? warn_slowpath_fmt+0x47/0x50
[ 14.357499] [<ffffffff816f9549>] ? mutex_lock+0x9/0x30
[ 14.357501] [<ffffffff81641b35>] ? netfilter_net_exit+0x25/0x50
[ 14.357504] [<ffffffff8160b78e>] ? ops_exit_list.isra.6+0x2e/0x60
[ 14.357507] [<ffffffff8160c3eb>] ? cleanup_net+0x1ab/0x280
[ 14.357509] [<ffffffff81074b33>] ? process_one_work+0x133/0x330
[ 14.357511] [<ffffffff81074d90>] ? worker_thread+0x60/0x470
[ 14.357512] [<ffffffff81074d30>] ? process_one_work+0x330/0x330
[ 14.357514] [<ffffffff81079c0a>] ? kthread+0xca/0xe0
[ 14.357517] [<ffffffff81079b40>] ?
kthread_create_on_node+0x170/0x170
[ 14.357519] [<ffffffff816fb5cf>] ? ret_from_fork+0x3f/0x70
[ 14.357521] [<ffffffff81079b40>] ?
kthread_create_on_node+0x170/0x170
[ 14.357522] ---[ end trace 9984cc4b0e89f819 ]---
[ 14.357523] ------------[ cut here ]------------
--
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