sched_queue_test.go fails with wrong number of calls

[inercia]

sched_queue_test.go fails sometimes with "expected X and got X+/-1" errors.

--- FAIL: TestSchedCallsGap-4 (0.01s)
    sched_queue_test.go:62: Now: 1970-01-01 00:16:40 +0000 UTC - calls: 900
    util.go:134: Expected Number of calls 901 but got 900
        goroutine 33 [running]:
        github.com/weaveworks/weave/testing.stackTrace(0xc20809e000, 0x0, 0x0)
            /home/travis/gopath/src/github.com/weaveworks/weave/testing/util.go:143 +0x88
        github.com/weaveworks/weave/testing.StackTrace(0x0, 0x0)
            /home/travis/gopath/src/github.com/weaveworks/weave/testing/util.go:138 +0x35
        github.com/weaveworks/weave/testing.Fatalf(0xc208090090, 0x583170, 0x19, 0xc20806de08, 0x3, 0x3)
            /home/travis/gopath/src/github.com/weaveworks/weave/testing/util.go:134 +0x27
        github.com/weaveworks/weave/testing.AssertEqualInt(0xc208090090, 0x384, 0x385, 0x56c190, 0xf)
            /home/travis/gopath/src/github.com/weaveworks/weave/testing/util.go:51 +0x1b3
        github.com/weaveworks/weave/common.TestSchedCallsGap(0xc208090090)
            /home/travis/gopath/src/github.com/weaveworks/weave/common/sched_queue_test.go:63 +0x55c
        testing.tRunner(0xc208090090, 0x6201b8)
            /usr/local/go/src/testing/testing.go:447 +0xbf
        created by testing.RunTests
            /usr/local/go/src/testing/testing.go:555 +0xa8b
INFO: 2015/06/16 18:58:06.106500 TestSchedCallsStop starting
FAIL
coverage: 73.3% of statements
FAIL    github.com/weaveworks/weave/common  0.030s
ok      github.com/weaveworks/weave/ipam    7.379s  coverage: 67.5% of statements
ok      github.com/weaveworks/weave/ipam/paxos  3.669s  coverage: 96.4% of statements
ok      github.com/weaveworks/weave/ipam/ring   1.718s  coverage: 90.4% of statements
ok      github.com/weaveworks/weave/ipam/space  0.003s  coverage: 71.6% of statements
ok      github.com/weaveworks/weave/nameserver  18.372s coverage: 84.3% of statements
ok      github.com/weaveworks/weave/net 0.003s  coverage: 5.3% of statements
ok      github.com/weaveworks/weave/router  0.378s  coverage: 28.9% of statements
make: *** [tests] Error 1

[rade]

any clues yet?

[inercia]

nothing yet... it is a low-frequency bug (about 1 in 2000 runs of the unit tests), so it is difficult to try new things...

[inercia]

This will be gone once the gossip DNS is in place...

[rade]

This will be gone once the gossip DNS is in place...

but it's not in place yet. -> re-opening.