I am now seeing a bunch of epoll_waits in the strace. Multiple master processes spawn.

4519 0.000000 epoll_wait(143, {}, 512, 500) = 0
4519 0.500833 epoll_wait(143, {}, 512, 500) = 0
4519 0.500785 epoll_wait(143, {}, 512, 500) = 0
4519 0.500756 epoll_wait(143, {}, 512, 500) = 0
4519 0.500742 epoll_wait(143, {}, 512, 500) = 0
4519 0.500760 epoll_wait(143, {}, 512, 500) = 0
4519 0.500815 epoll_wait(143, {}, 512, 500) = 0
4519 0.500792 epoll_wait(143, {}, 512, 500) = 0
4519 0.500727 epoll_wait(143, {}, 512, 500) = 0
4519 0.500760 epoll_wait(143, {}, 512, 500) = 0
4519 0.500754 epoll_wait(143, {}, 512, 500) = 0
4519 0.500702 epoll_wait(143, {}, 512, 500) = 0
4519 0.500742 epoll_wait(143, {}, 512, 500) = 0
4519 0.500751 epoll_wait(143, {}, 512, 500) = 0
4519 0.500786 epoll_wait(143, {}, 512, 500) = 0
4519 0.500764 epoll_wait(143, {}, 512, 500) = 0
4519 0.500743 epoll_wait(143, {}, 512, 500) = 0