panic due to double-close of channel

I'm not sure what's going on here, but clearly fleet should never try to close an already-closed channel: From https://github.com/coreos/fleet/issues/1044:

```
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: ERROR server.go:169: Server monitor triggered: Monitor timed out before successful heartbeat
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: panic: runtime error: close of closed channel
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: goroutine 11048 [running]:
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: runtime.panic(0x77e400, 0x9bf155)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/runtime/panic.c:279 +0xf5
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: github.com/coreos/fleet/server.(*Server).Monitor(0xc208455560)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/server/server.go:171 +0xfb
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: created by github.com/coreos/fleet/server.(*Server).Run
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/server/server.go:152 +0x10e
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: goroutine 16 [chan receive]:
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: main.listenForSignals(0xc2080a5650)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/fleetd/fleet.go:189 +0x16d
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: main.main()
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/fleetd/fleet.go:121 +0xf2b
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: goroutine 19 [finalizer wait]:
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: runtime.park(0x416b60, 0x9c3dd0, 0x9c2029)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/runtime/proc.c:1369 +0x89
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: runtime.parkunlock(0x9c3dd0, 0x9c2029)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/runtime/proc.c:1385 +0x3b
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: runfinq()
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/runtime/mgc0.c:2644 +0xcf
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: runtime.goexit()
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/runtime/proc.c:1445
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: goroutine 20 [syscall]:
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: os/signal.loop()
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/os/signal/signal_unix.go:21 +0x1e
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: created by os/signal.init·1
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/os/signal/signal_unix.go:27 +0x32
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: goroutine 21 [IO wait, 17 minutes]:
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.runtime_pollWait(0x7fef8134ac10, 0x72, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/runtime/netpoll.goc:146 +0x66
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*pollDesc).Wait(0xc208037f00, 0x72, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/fd_poll_runtime.go:84 +0x46
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*pollDesc).WaitRead(0xc208037f00, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/fd_poll_runtime.go:89 +0x42
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*netFD).readMsg(0xc208037ea0, 0xc2083a0570, 0x10, 0x10, 0xc20809f220, 0x1000, 0x1000, 0xffffffffffffffff, 0x0, 0x0, ...)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/fd_unix.go:296 +0x47f
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*UnixConn).ReadMsgUnix(0xc2080480c0, 0xc2083a0570, 0x10, 0x10, 0xc20809f220, 0x1000, 0x1000, 0xc208234000, 0xb97a, 0xb97a, ...)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/unixsock_posix.go:154 +0x16c
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus.(*oobReader).Read(0xc20809f200, 0xc2083a0570, 0x10, 0x10, 0x1, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus/transport_unix.go:21 +0xc9
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: io.ReadAtLeast(0x7fef8134adf8, 0xc20809f200, 0xc2083a0570, 0x10, 0x10, 0x10, 0x0, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/io/io.go:289 +0xf7
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: io.ReadFull(0x7fef8134adf8, 0xc20809f200, 0xc2083a0570, 0x10, 0x10, 0xb97a, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/io/io.go:307 +0x71
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus.(*unixTransport).ReadMessage(0xc208001730, 0xc20800f470, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus/transport_unix.go:85 +0x198
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus.(*Conn).inWorker(0xc208003e60)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus/conn.go:241 +0x57
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: created by github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus.(*Conn).Auth
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus/auth.go:118 +0xd2a
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: goroutine 22 [chan receive, 17 minutes]:
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus.(*Conn).outWorker(0xc208003e60)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus/conn.go:363 +0x54
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: created by github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus.(*Conn).Auth
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus/auth.go:119 +0xd45
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: goroutine 23 [IO wait]:
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.runtime_pollWait(0x7fef8134ab60, 0x72, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/runtime/netpoll.goc:146 +0x66
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*pollDesc).Wait(0xc208036ae0, 0x72, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/fd_poll_runtime.go:84 +0x46
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*pollDesc).WaitRead(0xc208036ae0, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/fd_poll_runtime.go:89 +0x42
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*netFD).readMsg(0xc208036a80, 0xc2082bcd00, 0x10, 0x10, 0xc20813f620, 0x1000, 0x1000, 0xffffffffffffffff, 0x0, 0x0, ...)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/fd_unix.go:296 +0x47f
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*UnixConn).ReadMsgUnix(0xc208048018, 0xc2082bcd00, 0x10, 0x10, 0xc20813f620, 0x1000, 0x1000, 0xc2081acb90, 0x49, 0x49, ...)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/unixsock_posix.go:154 +0x16c
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus.(*oobReader).Read(0xc20813f600, 0xc2082bcd00, 0x10, 0x10, 0x1, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus/transport_unix.go:21 +0xc9
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: io.ReadAtLeast(0x7fef8134adf8, 0xc20813f600, 0xc2082bcd00, 0x10, 0x10, 0x10, 0x0, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/io/io.go:289 +0xf7
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: io.ReadFull(0x7fef8134adf8, 0xc20813f600, 0xc2082bcd00, 0x10, 0x10, 0x49, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/io/io.go:307 +0x71
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus.(*unixTransport).ReadMessage(0xc2080015f0, 0xc2080a6000, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus/transport_unix.go:85 +0x198
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus.(*Conn).inWorker(0xc20808e120)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus/conn.go:241 +0x57
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: created by github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus.(*Conn).Auth
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus/auth.go:118 +0xd2a
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: goroutine 24 [chan receive, 19 minutes]:
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus.(*Conn).outWorker(0xc20808e120)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus/conn.go:363 +0x54
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: created by github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus.(*Conn).Auth
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus/auth.go:119 +0xd45
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: goroutine 25 [chan receive]:
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: github.com/coreos/fleet/Godeps/_workspace/src/github.com/coreos/go-systemd/dbus.func·001()
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/Godeps/_workspace/src/github.com/coreos/go-systemd/dbus/subscription.go:66 +0x60
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: created by github.com/coreos/fleet/Godeps/_workspace/src/github.com/coreos/go-systemd/dbus.(*Conn).dispatch
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/Godeps/_workspace/src/github.com/coreos/go-systemd/dbus/subscription.go:98 +0xc3
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: goroutine 26 [IO wait, 19 minutes]:
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.runtime_pollWait(0x7fef8134aab0, 0x72, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/runtime/netpoll.goc:146 +0x66
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*pollDesc).Wait(0xc208037b80, 0x72, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/fd_poll_runtime.go:84 +0x46
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*pollDesc).WaitRead(0xc208037b80, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/fd_poll_runtime.go:89 +0x42
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*netFD).accept(0xc208037b20, 0x87c188, 0x0, 0x7fef81349440, 0xb)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/fd_unix.go:419 +0x343
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*UnixListener).AcceptUnix(0xc2080b24a0, 0x18, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/unixsock_posix.go:293 +0x73
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*UnixListener).Accept(0xc2080b24a0, 0x0, 0x0, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/unixsock_posix.go:304 +0x4b
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net/http.(*Server).Serve(0xc208004300, 0x7fef8134b2b0, 0xc2080b24a0, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/http/server.go:1698 +0x91
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net/http.Serve(0x7fef8134b2b0, 0xc2080b24a0, 0x7fef8134c5b0, 0xc20804a000, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/http/server.go:1576 +0x7c
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: github.com/coreos/fleet/api.func·001()
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/api/server.go:35 +0x78
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: created by github.com/coreos/fleet/api.(*Server).Serve
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/api/server.go:39 +0xf5
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: goroutine 11408 [select]:
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: github.com/coreos/fleet/agent.(*UnitStatePublisher).Run(0xc2084ed580, 0xc2084543c0, 0xc208454360)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/agent/unit_state.go:105 +0x287
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: created by github.com/coreos/fleet/server.(*Server).Run
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/server/server.go:161 +0x25f
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: goroutine 1463 [IO wait, 15 minutes]:
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.runtime_pollWait(0x7fef81354a28, 0x72, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/runtime/netpoll.goc:146 +0x66
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*pollDesc).Wait(0xc208587950, 0x72, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/fd_poll_runtime.go:84 +0x46
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*pollDesc).WaitRead(0xc208587950, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/fd_poll_runtime.go:89 +0x42
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*netFD).readMsg(0xc2085878f0, 0xc20851aae0, 0x10, 0x10, 0xc20837e020, 0x1000, 0x1000, 0xffffffffffffffff, 0x0, 0x0, ...)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/fd_unix.go:296 +0x47f
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: net.(*UnixConn).ReadMsgUnix(0xc20858c180, 0xc20851aae0, 0x10, 0x10, 0xc20837e020, 0x1000, 0x1000, 0xc2085d6000, 0x1, 0x30000000000b95e, ...)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /usr/lib/go/src/pkg/net/unixsock_posix.go:154 +0x16c
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus.(*oobReader).Read(0xc20837e000, 0xc20851aae0, 0x10, 0x10, 0x1, 0x0, 0x0)
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: /build/amd64-usr/var/tmp/portage/app-admin/fleet-0.8.3/work/fleet-0.8.3/gopath/src/github.com/coreos/fleet/Godeps/_workspace/src/github.com/godbus/dbus/transport_unix.go:21 +0xc9
Dec 02 18:26:05 ip-172-31-24-115.eu-west-1.compute.internal fleetd[570]: io.ReadAtLeast(0x7fef8134adf8, 0xc20837e000, 0xc20851aae0, 0x10, 0x10, 0x10, 0x0, 0x0, 0x0)

...
```