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Discovered by ayushranjan@:
VFS2 was employing the following algorithm for fetching ready events from an
epoll instance:
- Create a statically sized EpollEvent slice on the stack of size 16.
- Pass that to EpollInstance.ReadEvents() to populate.
- EpollInstance.ReadEvents() requeues level-triggered events that it returns
back into the ready queue.
- Write the results to usermem.
- If the number of results were = 16 then recall EpollInstance.ReadEvents() in
the hopes of getting more. But this will cause duplication of the "requeued"
ready level-triggered events.
So if the ready queue has >= 16 ready events, the EpollWait for loop will spin
until it fills the usermem with `maxEvents` events.
Fixes #3521
PiperOrigin-RevId: 331840527
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