Simply upgrading eslint-pluginand parser from 2.3.3 to 2.4.0 causes eslint to hang at the end of the processing.

npx eslint --cache --report-unused-disable-directives "./**/*.{js,jsx,ts,tsx}"

I've enabled basic debugging DEBUG=eslint:cli-engine and the last message is eslint:cli-engine Linting complete in: 110453ms +219ms and then the eslint command does not seem to return (within several minutes) and I can only kill the process.
I have tried this without any change to the sources to be parsed or the configuration and simply upgrading to 2.4.0 makes eslint hang and after moving back to 2.3.3 it does no longer hang.

(I'm aware that I should upload a reproducible test case but given the nature of this problem this seems not possible right now)

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