RFR: 8373409: java/net/httpclient/http3/H3ErrorHandlingTest.java failed due to deadlock

[Daniel Jeliński]

On Fri, 12 Dec 2025 12:31:07 GMT, Daniel Jeliński <djelinski at openjdk.org> wrote:

> This PR fixes a deadlock between the `localConnectionIdManager` and the `connections` map by closing the manager before calling `connections.compute`.
> 
> No new tests; the issue requires a complex setup to reproduce, and the new code is easy enough to reason about. Existing tests continue to pass.

I checked all other uses of `CHM.compute` in the `java.net.http` module; most of them are trivially correct. The ones in `AltServiceRegistry` are not trivial, and might need to be replaced with something easier to reason about. I'll look into that.

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PR Comment: https://git.openjdk.org/jdk/pull/28788#issuecomment-3646319986