I should also mention this from select(2):

"An  fd_set  is  a  fixed size buffer.  Executing FD_CLR() or FD_SET()
with a value of fd that is negative or is equal to or larger than
FD_SETSIZE will result in undefined behavior.  Moreover, POSIX requires
fd to be a valid file descriptor."

-- 
RLIMIT_NOFILE > FD_SETSIZE seems to cause select() to corrupt the stack
https://bugs.launchpad.net/bugs/386558
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