make test failure

I get error after "make test"
go version: go1.7.1 darwin/amd64

log for panic:

2016/09/21 08:06:31 [INFO] serf: EventMemberReap:
panic: Fail in goroutine after TestSerf_ReapHandler_Shutdown has completed

goroutine 1028 [running]:
panic(0x430b60, 0xc42013c960)
/usr/local/go/src/runtime/panic.go:500 +0x1a1
testing.(_common).Fail(0xc4202c2300)
/usr/local/go/src/testing/testing.go:412 +0x11f
testing.(_common).FailNow(0xc4202c2300)
/usr/local/go/src/testing/testing.go:431 +0x2b
testing.(_common).Fatalf(0xc4202c2300, 0x4ca6b9, 0x7, 0x0, 0x0, 0x0)
/usr/local/go/src/testing/testing.go:496 +0x83
github.com/hashicorp/serf/serf.TestSerf_ReapHandler_Shutdown.func1(0xc420394180, 0xc4202c2300)
$GOPATH/src/github.com/hashicorp/serf/serf/serf_test.go:841 +0x78
created by github.com/hashicorp/serf/serf.TestSerf_ReapHandler_Shutdown
$GOPATH/go-work/src/github.com/hashicorp/serf/serf/serf_test.go:842 +0x7b
FAIL github.com/hashicorp/serf/serf 5.862s
ok github.com/hashicorp/serf/testutil 0.008s
make: *_\* [test] Error 1