RFR: 8376479: Http3 test server thread deadlock in ThrowingPublishersInRequest

[Daniel Jeliński]

On Tue, 27 Jan 2026 13:54:07 GMT, Daniel Jeliński <djelinski at openjdk.org> wrote:

> This fixes a deadlock between the thread that reads from the RequestBodyInputStream and the thread that tries to close it in response to a stream reset. See the linked JBS ticket for details.
> 
> Tier1 and tier2 tests continue to pass. I verified that with this change there are no busy threads at the end of the test.

Thanks @vy @dfuch for the reviews.

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PR Review: https://git.openjdk.org/jdk/pull/29448#pullrequestreview-3712406311