linux-kernel - Re: Kernel 4.8.7 crashing

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Date:   Mon, 14 Nov 2016 09:18:55 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Ashton Holmes <scoopta@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: Kernel 4.8.7 crashing

(Really Cc'ing netdev.. ;-p )

On Mon, Nov 14, 2016 at 9:18 AM, Cong Wang <xiyou.wangcong@...il.com> wrote:
> Cc'ing netdev.
>
> On Sat, Nov 12, 2016 at 2:17 PM, Ashton Holmes <scoopta@...il.com> wrote:
>> I upgraded to 4.8.7 and the system boots and my root partition gets
>> decrypted but right after that both of my monitors turn off and
>> looking at syslog from 4.8.6 shows the following:
>>
>> Nov 12 11:54:24 user-desktop kernel: [   19.853197] ------------[ cut
>> here ]------------
>> Nov 12 11:54:24 user-desktop kernel: [   19.853206] WARNING: CPU: 2
>> PID: 177 at fs/proc/proc_sysctl.c:1607 ops_exit_list.isra.4+0x33/0x60
>
> Probably this warning in source code:
>
> void retire_sysctl_set(struct ctl_table_set *set)
> {
>         WARN_ON(!RB_EMPTY_ROOT(&set->dir.root));
> }
>
>
>> Nov 12 11:54:24 user-desktop kernel: [   19.853210] Modules linked in:
>> amdgpu eeepc_wmi i2c_algo_bit asus_wmi drm_kms_helper video rfkill
>> snd_hda_codec_realtek ttm snd_hda_codec_generic snd_hda_codec_hdmi drm
>> snd_hda_intel snd_usb_audio sparse_keymap snd_hda_codec mxm_wmi
>> snd_usbmidi_lib snd_hda_core efi_pstore snd_hwdep snd_rawmidi evdev
>> snd_seq_device joydev snd_pcm serio_raw pcspkr efivars fam15h_power
>> k10temp snd_timer snd sp5100_tco i2c_piix4 sg soundcore i2c_core
>> shpchp tpm_infineon tpm_tis tpm_tis_core tpm wmi button it87 hwmon_vid
>> autofs4 ext4 crc16 jbd2 mbcache algif_skcipher af_alg dm_crypt dm_mod
>> hid_generic usbhid hid sr_mod cdrom sd_mod ohci_pci crct10dif_pclmul
>> crc32_pclmul crc32c_intel aesni_intel aes_x86_64 glue_helper lrw
>> gf128mul ablk_helper cryptd psmouse ohci_hcd ahci libahci ehci_pci
>> ehci_hcd libata xhci_pci xhci_hcd e1000e usbcore scsi_mod ptp
>> usb_common pps_core
>> Nov 12 11:54:24 user-desktop kernel: [   19.853264] CPU: 2 PID: 177
>> Comm: kworker/u16:2 Not tainted 4.8.7 #1
>> Nov 12 11:54:24 user-desktop kernel: [   19.853267] Hardware name: To
>> be filled by O.E.M. To be filled by O.E.M./CROSSHAIR V FORMULA-Z, BIOS
>> 2201 03/23/2015
>> Nov 12 11:54:24 user-desktop kernel: [   19.853273] Workqueue: netns cleanup_net
>> Nov 12 11:54:24 user-desktop kernel: [   19.853276]  0000000000000286
>> 00000000b98071d2 ffffffff81302a8f 0000000000000000
>> Nov 12 11:54:24 user-desktop kernel: [   19.853281]  0000000000000000
>> ffffffff81076f54 ffff880814f88040 ffff8808140efdf0
>> Nov 12 11:54:24 user-desktop kernel: [   19.853285]  ffffffff818f11d8
>> ffffffff818f11e0 ffff8808140efde0 0000000000000200
>> Nov 12 11:54:24 user-desktop kernel: [   19.853290] Call Trace:
>> Nov 12 11:54:24 user-desktop kernel: [   19.853295]
>> [<ffffffff81302a8f>] ? dump_stack+0x5c/0x7d
>> Nov 12 11:54:24 user-desktop kernel: [   19.853299]
>> [<ffffffff81076f54>] ? __warn+0xc4/0xe0
>> Nov 12 11:54:24 user-desktop kernel: [   19.853302]
>> [<ffffffff8149e243>] ? ops_exit_list.isra.4+0x33/0x60
>> Nov 12 11:54:24 user-desktop kernel: [   19.853305]
>> [<ffffffff8149f230>] ? cleanup_net+0x1b0/0x290
>> Nov 12 11:54:24 user-desktop kernel: [   19.853309]
>> [<ffffffff8108fefd>] ? process_one_work+0x14d/0x410
>> Nov 12 11:54:24 user-desktop kernel: [   19.853312]
>> [<ffffffff81090cc2>] ? worker_thread+0x62/0x490
>> Nov 12 11:54:24 user-desktop kernel: [   19.853315]
>> [<ffffffff81090c60>] ? rescuer_thread+0x340/0x340
>> Nov 12 11:54:24 user-desktop kernel: [   19.853318]
>> [<ffffffff81095f3f>] ? kthread+0xdf/0x100
>> Nov 12 11:54:24 user-desktop kernel: [   19.853322]
>> [<ffffffff8102b78b>] ? __switch_to+0x2bb/0x710
>> Nov 12 11:54:24 user-desktop kernel: [   19.853325]
>> [<ffffffff815a371f>] ? ret_from_fork+0x1f/0x40
>> Nov 12 11:54:24 user-desktop kernel: [   19.853328]
>> [<ffffffff81095e60>] ? kthread_park+0x50/0x50
>> Nov 12 11:54:24 user-desktop kernel: [   19.853331] ---[ end trace
>> c4840b46b58dbe12 ]---
>
> Looks like net->sysctls is not empty when unregistering,
> perhaps unregister_net_sysctl_table() is missing somewhere.