Comment 1 for bug 1672260

Observed the same crash on mainline as well (4.0.0.0-3044~kilo) with vlan sub-interface creation/deletion.

[18172.227193] Call Trace:
[18172.232588] [<ffffffff812341f1>] count_subheaders+0x31/0x70
[18172.238018] [<ffffffff812341f1>] count_subheaders+0x31/0x70
[18172.243232] [<ffffffff812341f1>] count_subheaders+0x31/0x70
[18172.248258] [<ffffffff812341f1>] count_subheaders+0x31/0x70
[18172.253115] [<ffffffff812341f1>] count_subheaders+0x31/0x70
[18172.257817] [<ffffffff812341f1>] count_subheaders+0x31/0x70
[18172.262338] [<ffffffff81234b26>] unregister_sysctl_table+0x26/0x90
[18172.266803] [<ffffffff8109f6dd>] partition_sched_domains+0x3d/0x390
[18172.271188] [<ffffffff811a6fb5>] ? __kmalloc+0x55/0x250
[18172.275460] [<ffffffff810f66ca>] rebuild_sched_domains_locked+0x4a/0x60
[18172.279699] [<ffffffff810f68ed>] update_flag+0x14d/0x1a0
[18172.283819] [<ffffffff810f6ac3>] cpuset_css_offline+0x33/0x60
[18172.287901] [<ffffffff810edbe7>] offline_css+0x27/0x50
[18172.291893] [<ffffffff810f132d>] css_killed_work_fn+0x2d/0xa0
[18172.295860] [<ffffffff81086fc8>] process_one_work+0x178/0x470
[18172.299815] [<ffffffff81087de1>] worker_thread+0x121/0x410
[18172.303716] [<ffffffff81087cc0>] ? rescuer_thread+0x430/0x430
[18172.307619] [<ffffffff8108ebc9>] kthread+0xc9/0xe0
[18172.311459] [<ffffffff8108eb00>] ? kthread_create_on_node+0x1c0/0x1c0
[18172.315260] [<ffffffff8173dca8>] ret_from_fork+0x58/0x90
[18172.318990] [<ffffffff8108eb00>] ? kthread_create_on_node+0x1c0/0x1c0
[18172.322706] Code: 89 e5 48 8b 40 e0 5d 48 83 78 18 00 0f 95 c0 0f b6 c0 c3 66 90 0f 1f 44 00 00 55 48 85 ff 48 89 e5 41 55 41 54 53 48 89 fb 74 4a <48> 83 3f 00 74 44 45 31 e4 45 31 ed eb 16 0f 1f 40 00 48 83 c3
[18172.334113] RIP [<ffffffff812341d6>] count_subheaders+0x16/0x70
[18172.337773] RSP <ffff88102573db98>