epoll regression on linux 6.15-rc6: epoll_pwait2 will block indefinitely

epoll_regression.cpp

#include <sys/epoll.h>
#include <unistd.h>
#include <iostream>

int main()
{
  auto epollfd = epoll_create1(0);
  struct epoll_event events[16];

  
  while (true)
  {
    std::cout << "enter" << std::endl;

    const struct timespec timeout = {0, 1000}; // 1us
    epoll_pwait2 (epollfd, events, 16, &timeout, nullptr);
    
    std::cout << "exit" << std::endl;
  }

  close(epollfd);
  return 0;
}