[crac] RFR: 8377562: [CRaC] Add better logging to RemoteJmxTest [v2]

[Timofei Pushkin]

On Fri, 20 Feb 2026 09:54:41 GMT, Timofei Pushkin <tpushkin at openjdk.org> wrote:

>> Makes `RemoteJmxTest` log stderr of the child process.
>
> Timofei Pushkin has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains eight additional commits since the last revision:
> 
>  - Ensure resources live long enough in some tests
>  - Merge remote-tracking branch 'openjdk-crac/crac' into remote-jmx-test
>  - Always capture output
>  - Improve process synchronization in ImageScoreTest
>  - Make timed waiting more robust
>  - Merge remote-tracking branch 'openjdk-crac/crac' into remote-jmx-test
>  - Refactor CracProcess to allow multi-waiting
>  - Add better logging to RemoteJmxTest

I wondered why CRIU tests suddenly started passing even though https://github.com/openjdk/crac/pull/296 is not included here yet. Turns out they [reverted](https://github.com/actions/runner-images/pull/13706) the CI's kernel update that caused the issue.

Doesn't change anything for us, just noting.

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PR Comment: https://git.openjdk.org/crac/pull/295#issuecomment-3943562039