net/http: race in http2Transport [1.14 backport]

[dmitshur]

@answer1991 requested issue #31192 to be considered for backport to the next 1.14 minor release.

Kubernetes team had already announced GOAWAY feature in Kubernetes v1.19 release notes. However, if Kubernetes enable GOAWAY feature, the client will receive unexpected 500 status code errors which I described at #41234, and there is no workaround. I think backport is necessary.

@gopherbot ple​ase backport, as Kubernetes is affected and there is no workaround.

(The corresponding 1.15 backport request is #42539.)

[answer1991]

We should also backport #42498.

[cagedmantis]

We are taking a little more time to review this before deciding.

[toothrot]

This is a serious issue with no workaround. Approved.

[dmitshur]

To resolve this backport issue, CL 253259 (for #31192) and CL 269058 (for #42498) will need to be backported to the x/net's release-branch.go1.14 branch, and then the bundled copy of golang.org/x/net/http2 in net/http needs to be updated. The process is described in https://golang.org/wiki/MinorReleases#making-cherry-pick-cls.

[gopherbot]

Change https://golang.org/cl/288114 mentions this issue: [release-branch.go1.14] http2: send a nil error if we cancel a delayed body write