serverSession: idleTimeMs times out while there is activity

[jrwren]

Thanks for your help improving the project!

Getting Help

Github issues are for bug reports and feature requests. For questions about
Linkerd, how to use it, or debugging assistance, start by
asking a question in the forums or join us on
Slack.

Full details at CONTRIBUTING.md.

Filing a Linkerd issue

Issue Type:

• Bug report
• Feature request

What happened:

linkerd timed out an active session, when the only serverSession setting set was idleTimeMs.

What you expected to happen:

No timeout as the session was not idle.

How to reproduce it (as minimally and precisely as possible):

Follow the getting started guide here: https://linkerd.io/1/getting-started/locally/
add this config:

    serverSession:
      idleTimeMs: 30000

Use a server on port 9999 which response slowly for more than the timeout. Here is one written in Go:
https://gist.github.com/jrwren/2c1329b9920eef5b7b398164b3f74875

Anything else we need to know?:

Environment:

• linkerd/namerd version, config files:
  linkerd 1.7.2 (1.7.5-5c1 crashes for me)

• Platform, version, and config files (Kubernetes, DC/OS, etc):
  macos

• Cloud provider or hardware configuration: