TestPingCalledOnceOnlyForSeveralWorkers fails

[Aaron Bentley]

E.g. http://reports.vapour.ws/releases/2653/job/run-unit-tests-trusty-ppc64el-lxc/attempt/451

This fails very, very frequently for us.

ok github.com/juju/juju/worker/rsyslog 9.482s

----------------------------------------------------------------------
FAIL: singular_test.go:133: com_juju_juju_worker_singular_test.TestPingCalledOnceOnlyForSeveralWorkers.pN55_github.com_juju_juju_worker_singular_test.singularSuite

[LOG] 0:00.000 INFO juju.worker.singular runner created; isMaster false
[LOG] 0:00.000 INFO juju.worker.singular standby "worker0"
[LOG] 0:00.003 INFO juju.worker.singular standby "worker1"
[LOG] 0:00.003 INFO juju.worker.singular standby "worker2"
[LOG] 0:00.003 INFO juju.worker start "worker0"
[LOG] 0:00.004 INFO juju.worker start "worker1"
[LOG] 0:00.004 INFO juju.worker.singular standby "worker3"
[LOG] 0:00.004 INFO juju.worker start "worker2"
[LOG] 0:00.005 INFO juju.worker.singular standby "worker4"
[LOG] 0:00.005 INFO juju.worker start "worker3"
[LOG] 0:00.005 INFO juju.worker start "worker4"
singular_test.go:166:
    c.Assert(n, gc.Equals, 1)
... obtained int = 2
... expected int = 1

OOPS: 3 passed, 1 skipped, 1 FAILED
--- FAIL: TestPackage (0.14 seconds)
FAIL

[Aaron Bentley (abentley)]

Seen also in 1.24
http://reports.vapour.ws/releases/2729/job/run-unit-tests-trusty-ppc64el-lxc/attempt/527

1.23
http://reports.vapour.ws/releases/2713/job/run-unit-tests-trusty-ppc64el-lxc/attempt/511

[Curtis Hovey (sinzui)]

This issue has grown worse. We now see it in non-lxc ppc64el test runs, and may be the singular reason 1.24.2 is not blessed.

http://reports.vapour.ws/releases/2838/job/run-unit-tests-trusty-ppc64el/attempt/3453
http://reports.vapour.ws/releases/2838/job/run-unit-tests-trusty-ppc64el/attempt/3446
http://reports.vapour.ws/releases/2838/job/run-unit-tests-trusty-ppc64el/attempt/3445

[Curtis Hovey (sinzui)]

This is a link to all the recent occurrences of this bug
    http://reports.vapour.ws/releases/issue/555645da749a5650fa59f346