Re: nf_unregister_net_hook: hook not found!

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

On 2015-12-30 03:39, ebiederm@xxxxxxxxxxxx wrote:
> Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> writes:
>
> > 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?
>
> I am on vacation until the new year, but if this is reproducible we
> should be able to print out reg, reg->pf, reg->hooknum, reg->hook
> to figure out which hook is having something very weird happen to it.
>
> This is happening in some network namespace exit.
>
> Eric

Unfortunately i have found no way to reproduce,
13 seconds implies it was at boot, but i only have seen this once.

--
Sander

> > 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@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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