Use IP address instead of hostname to avoid a bug in libc #480
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On certain linux systems there seems to be a bug in libc which causes deadlock of Ruby interpreter.
It only happens when ruby tries to resolve a hostname and its specifically triggered with many short-lived Ruby processes e.g. Resque.
See issue - #466 - where the solution was to use IP address instead of hostname.
Also this comment that contains GDB trace of all threads seems to directly point to libc call to resolve hostname.