Tests fail using the mongo package from raring, or ppa

[Dave Cheney]

The version of mongo that we install for Raring (from the archive) or Quantal & Precise (from PPA) does not pass unit tests.

This is a serious problem.

[Данило Шеган (danilo)]

This is a "go test ./..." run on raring with packaged mongodb (2.2.4-0ubuntu1) on arm64.

All the tests pass successfully with our tarball mongodb 2.2.0.

[Dave Cheney (dave-cheney)]

I've been chasing this off and on for a few days now. Here is what I know so far

1. there were some races, i've fixed those

2. this absolutely happens with the packaged mongo, and absolutely does not happen with our tarball

3. it is not actually a problem with TLS, i've added debugging to crypto/tls and we are negotiating the same ciphers

4. i believe it is either

  a. a race between cleaning up the mongo server and the cleanup actions themselves that try to remove the juju and presence tables. once they fail, then the next test does not run cleanly, and more failures propagate from that.

  b. a packet we send to mongo which isn't valid for 2.2.4, causing it to slam the connection closed.

5. if I run the tests under the race detector, they pass, which gives me more ammunition to think it is a race on the cleanup actions of the test.

[Andrew Wilkins (axwalk)]

FWIW, I have not had any issues with the packaged version in Raring (amd64).

[Dave Cheney (dave-cheney)]

Confirmed. Thank you.