APPLIED: [BIONIC] UBUNTU: SAUCE: Fix non-prefaulted page deadlock (LP: #1754584)

[Thadeu Lima de Souza Cascardo]

I had to mangle the patch in order to apply it. As we chatted, that is what you
meant to send, so that's what I applied.

Applied to bionic master-next branch.

Thanks.
Cascardo.

Applied-to: bionic/master-next