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77595e462b
Before this CL, if the system resolver does a very slow DNS lookup for a particular host, all subsequent requests for that host will hang waiting for that lookup to complete. That is more or less expected when Dial is called with no deadline. When Dial has a deadline, though, we can accumulate a large number of goroutines waiting for that slow DNS lookup. Try to avoid this problem by restarting the DNS lookup when it is redone after a deadline is passed. This CL also avoids creating an extra goroutine purely to handle the deadline. No test because we would have to simulate a slow DNS lookup followed by a fast DNS lookup. Fixes #8602. LGTM=bradfitz R=bradfitz, mikioh.mikioh CC=golang-codereviews, r, rsc https://golang.org/cl/154610044
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For example, if you extracted the tar file into $HOME/go, you might
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export GOROOT=$HOME/go
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