I know nginx 1.7.4 fixes a bug about DNS resolver, but i do not quite understand why this would lead to a request hang, Because there is a timeout handling, at a specified time if there is no response the timeout callback will be called，so why here can lead to request hang，
Could someone show me a example about how lead to request hang? I ask this,because i recently encountered a problem online product(it use nginx-1.7.2), may be caused by this problem -- ywsample :)
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