x/net/ipv4: operation not permitted on ipv4.PacketConn.SetTTL()

[webfrank]

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

1.9.2

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

linux/arm darwin/amd64

What did you do?

Just try the simple.go example of https://github.com/kanocz/tracelib

What did you expect to see?

Complete traceroute

What did you see instead?

operation not permitted error

If I compile the same example with go 1.8.3 works perfectly

[bradfitz]

/cc @mikioh

[mikioh]

You need to update your local copy of x/net because of #19209.