Why MySQL 8.4 Fails with io_setup() EAGAIN and How to Fix It

When upgrading MySQL 8.0 to 8.4 on a host running multiple instances, some instances fail to start with a series of InnoDB errors caused by io_setup() returning EAGAIN, which can be resolved by increasing the system's aio‑max‑nr limit and adjusting InnoDB I/O thread settings.

AIODatabase ConfigurationEAGAIN

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