RFR: 8372344: QUIC transfer may deadlock if pacing rate is too high

[Daniel Fuchs]

On Fri, 21 Nov 2025 21:41:29 GMT, Daniel Jeliński <djelinski at openjdk.org> wrote:

> Modify the PacketTransmissionTask to update the current deadline (`now`) between loop iterations.
> 
> This fixes the deadlock issue which happened when the next deadline was equal to the current one, but no progress could be made because the pacer quota only increases as time passes.
> 
> No new test; the issue was extremely rare. Existing tests continue to pass.

Changes look OK.

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Marked as reviewed by dfuchs (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28462#pullrequestreview-3499822381