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Date:	Wed, 30 Dec 2015 01:12:59 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Sander Eikelenboom <linux@...elenboom.it>
Cc:	netdev@...r.kernel.org, netfilter@...r.kernel.org,
	linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: nf_unregister_net_hook: hook not found!

On Mon, Dec 28, 2015 at 09:05:03PM +0100, Sander Eikelenboom wrote:
> Hi,
> 
> Running a 4.4.0-rc6 kernel i encountered the warning below.

Cc'ing Eric Biederman.

@Sander, could you provide a way to reproduce this?

Thanks.

> [   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@....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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