deadlock on read from socket with later

[toomish]

library(later)

serv <- serverSocket(2000)

f <- function() {
        sock <- socketConnection(port = 2000, blocking = TRUE, timeout = 1)
        recv <- readLines(sock)
        stopifnot(!length(recv))
        writeLines("timeout")
        close(sock)
}

later(f)
run_now()

f() called with later deadlock forever.
Without later will be timeout as expected after 1 second.

strace shows following constantly repeated lines:

pselect6(10, [4 6 9], [], NULL, {tv_sec=1, tv_nsec=0}, NULL) = 1 (in [4], left {tv_sec=0, tv_nsec=967908952})
...
read(4, "a", 256) 

Where 4, 6 are pipes and 9 is my socket descriptor.