RFR: 8268361: Fix the infinite loop in next_line [v4]

[Serguei Spitsyn]

On Wed, 9 Jun 2021 14:45:35 GMT, UncleNine <github.com+1964054+UncleNine at openjdk.org> wrote:

>> If the /proc/stat mount point is changed in container environment, the while loop may lead to 100% cpu usage.
>
> UncleNine has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR.

It looks okay to me.
Thanks,
Serguei

-------------

Marked as reviewed by sspitsyn (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/4378