Kernel bugs

We have the CRIU-linux-next job to check all kernel changes before they move into the upstream kernel.

Caught bugs

	Dozen of bugs before the next line
20150928	skbuff: Fix skb checksum partial check.
20150316	tcp_metrics: fix wrong lockdep annotations
20160512	kernfs: kernfs_sop_show_path: don't return 0 after seq_dentry call
20161024	[ISSUE] mm: Add a user_ns owner to mm_struct and fix ptrace_may_access
20161114	BUG: unable to handle kernel NULL pointer dereference in __sk_mem_raise_allocated()
20161114	linux-next: net->netns_ids is used after calling idr_destroy for it