Re: nf_unregister_net_hook: hook not found!

From: Eric W. Biederman
Date: Tue Dec 29 2015 - 21:50:25 EST

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


> 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@xxxxxxxxxxx
>> [ 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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