Created attachment 221464 [details]
patch for epoll create

In function epoll_create_common calls epoll_fd_install when kern_kqueue success,
I guess this is to initialize the proc emuldata space.
But when epoll has allocated a descriptor equal to EPOLL_DEF_SZ, the above action will clear the user data of fd EPOLL_DEF_SZ.This should be an error.

static int
epoll_create_common(struct thread *td, int flags)
{
        int error;
 
        error = kern_kqueue(td, flags, NULL);
        if (error != 0)
                return (error);
 
        epoll_fd_install(td, EPOLL_DEF_SZ, 0);
 
        return (0);
}

In my scenario, the function epoll_fd_install will cause the electron gpu thread consumes a lot of cpu resources because the returned fd cannot be processed correctly.
My patch is in the attachment.