On Wed, Jul 01, 2020 at 09:48:48PM -0700, Cong Wang wrote:

On Tue, Jun 30, 2020 at 3:48 PM Roman Gushchin [off-list ref] wrote:

quoted

Btw if we want to backport the problem but can't blame a specific commit,
we can always use something like "Cc: [off-list ref]    [3.1+]".

Sure, but if we don't know which is the right commit to blame, then how
do we know which stable version should the patch target? :)

I am open to all options here, including not backporting to stable at all.

It seems to be that the issue was there from bd1060a1d671 ("sock, cgroup: add sock->sk_cgroup"),
so I'd go with it. Otherwise we can go with 5.4+, as I understand before that it was
hard to reproduce it.

Thanks!