net/http/httptrace: panic on GotConn [1.13 backport]

[gopherbot]

@cuonglm requested issue #34282 to be considered for backport to the next 1.13 minor release.

@gopherbot please consider this for backport 1.13

[toothrot]

@cuonglm Could you please provide a short rationale about why the backport might be needed to 1.13? See https://golang.org/wiki/MinorReleases, which describes the process.

[cuonglm]

@toothrot This is a regression from 1.12, and bug introduce in 1.13. It should be backport to 1.13.1, otherwise, user code which built with go1.13 will be broken, example see grafana/k6#1153

[cuonglm]

@mvdan @bradfitz Should this issue be backport?

[bradfitz]

SGTM.

[cuonglm]

@tmthrgd would you mind creating CL with the cherry pick.

[tmthrgd]

@cuonglm I'm not sure how to do that, sorry. If someone else wants to create the cherry pick CL that would be appreciated.

[ALTree]

@tmthrgd See: https://github.com/golang/go/wiki/MinorReleases#making-cherry-pick-cls

[gopherbot]

Change https://golang.org/cl/196579 mentions this issue: [release-branch.go1.13] net/http: fix HTTP/2 idle pool tracing

[tmthrgd]

Thanks @ALTree, that was simple enough to follow.

[gopherbot]

Closed by merging a055bb9 to release-branch.go1.13.