GMP lead developer Thorbjorn Granlund has reported the situation to the project’s mailing list and has temporarily blocked all Microsoft IP addresses as an emergency measure.
Further investigation revealed that the culprit was the GitHub Actions workflow associated with the FFmpeg-Builds project. A GitHub user updated a script in the project resulting in many similar requests overloading their GMP servers. Designed to run parallel tests on various computer architectures, it overloaded the GMP infrastructure.
Although GitHub tried to prevent such workflows from running on forked repositories, the protection mechanism in this case did not work.
GMP servers are now fully available after Microsoft took action to block network ranges.
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