[1087918.428919] BUG: unable to handle kernel NULL pointer dereference at 00000011
[1087918.429004] IP: [<c1193897>] kernfs_find_ns+0x37/0xe0
[1087918.429052] *pdpt = 000000001efe1001 *pde = 0000000000000000
[1087918.429097] Oops: 0000 [#1] SMP
[1087918.429136] Modules linked in: act_mirred pppoe pppox ppp_generic slhc iptable_filter xt_length xt_TCPMSS xt_tcpudp xt_mark xt_dscp iptable_mangle ip_tables x_tables ipv6 sch_sfq sch_htb cls_u32 sch_ingress sch_prio sch_tbf cls_flow cls_fw act_police ifb 8021q mrp garp stp llc softdog thermal parport_pc parport fan iTCO_wdt iTCO_vendor_support processor i2c_i801 i2c_core thermal_sys igb(O) lpc_ich hwmon dca ptp pps_core sd_mod usb_storage pata_acpi pcspkr ata_piix ata_generic libata ehci_pci ehci_hcd scsi_mod usbcore usb_common ext4 mbcache jbd2 crc16 vfat fat isofs
[1087918.429527] CPU: 0 PID: 11329 Comm: accel-pppd Tainted: G           O    4.1.12-i686 #1
[1087918.429605] Hardware name: MSI MS-7788/H61M-P20 (G3) (MS-7788), BIOS V1.6 04/17/2012
[1087918.429681] task: f4c4eda0 ti: dee70000 task.ti: dee70000
[1087918.429723] EIP: 0060:[<c1193897>] EFLAGS: 00210202 CPU: 0
[1087918.429766] EIP is at kernfs_find_ns+0x37/0xe0
[1087918.429806] EAX: 1cd82615 EBX: 00000001 ECX: 1cd82615 EDX: 9cd82615
[1087918.429850] ESI: 00000000 EDI: c14ac66e EBP: dee71e2c ESP: dee71e04
[1087918.429893]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[1087918.429934] CR0: 80050033 CR2: 00000011 CR3: 34a4fe40 CR4: 000406f0
[1087918.429977] Stack:
[1087918.430012]  dee71e2c c119369a de4d03f0 de4d03f0 f5425400 dee71e38 652917d5 cd040990
[1087918.430093]  cd040990 c1415808 dee71e50 c119444f c1520fc0 dee71e74 c1193193 dee71e4c
[1087918.430176]  00000000 c14ac66e c1521340 dee71e64 c1196a2e cd040990 c14157fc cffd8ab8
[1087918.430256] Call Trace:
[1087918.430296]  [<c119369a>] ? __kernfs_remove+0xaa/0x1c0
[1087918.430338]  [<c119444f>] ? kernfs_remove_by_name_ns+0x2f/0x90
[1087918.430381]  [<c1193193>] ? kernfs_put+0xd3/0x190
[1087918.430422]  [<c1196a2e>] ? remove_files.isra.1+0x2e/0x60
[1087918.430465]  [<c1196d5d>] ? sysfs_remove_group+0x3d/0xa0
[1087918.430507]  [<c1196dea>] ? sysfs_remove_groups+0x2a/0x40
[1087918.430549]  [<c1196dea>] ? sysfs_remove_groups+0x2a/0x40
[1087918.430593]  [<c12ab5b5>] ? device_del+0xe5/0x1d0
[1087918.430633]  [<c1328302>] ? netdev_unregister_kobject+0x52/0x70
[1087918.430676]  [<c12b5ae8>] ? pm_runtime_set_memalloc_noio+0x38/0x90
[1087918.430720]  [<c132830b>] ? netdev_unregister_kobject+0x5b/0x70
[1087918.430763]  [<c130d33f>] ? rollback_registered_many+0x1bf/0x280
[1087918.430807]  [<c10a7e3b>] ? do_futex+0xeb/0x860
[1087918.430848]  [<c130d424>] ? rollback_registered+0x24/0x40
[1087918.430889]  [<c130e627>] ? unregister_netdevice_queue+0x57/0xc0
[1087918.430933]  [<c130e6ad>] ? unregister_netdev+0x1d/0x30
[1087918.430977]  [<f9535614>] ? ppp_shutdown_interface+0xd4/0xf0 [ppp_generic]
[1087918.431020]  [<f9537107>] ? ppp_release+0x67/0x70 [ppp_generic]
[1087918.431064]  [<f95370fc>] ? ppp_release+0x5c/0x70 [ppp_generic]
[1087918.431109]  [<c1139fb4>] ? __fput+0x84/0x1b0
[1087918.431151]  [<c1063d21>] ? task_work_run+0x91/0xd0
[1087918.431193]  [<c13bb355>] ? work_notifysig+0x16/0x1d
[1087918.431234]  [<c13b0000>] ? dns_resolver_cmp+0x10/0x120
[1087918.431275] Code: 66 90 8b 58 28 89 d7 0f b7 50 3c 89 ce c1 ea 05 80 e2 01 85 c9 0f 95 c1 38 d1 75 58 89 f2 89 f8 e8 4f f3 ff ff 89 c1 85 db 74 1b <3b> 4b 10 72 38 8d 74 26 00 77 07 3b 73 0c 72 2d 76 17 8b 5b 04
[1087918.431445] EIP: [<c1193897>] kernfs_find_ns+0x37/0xe0 SS:ESP 0068:dee71e04
[1087918.431492] CR2: 0000000000000011
[1087918.431673] ---[ end trace 7a8ff82544442be5 ]---