Docker crash https://github.com/dotcloud/docker/issues/2649

gistfile1.txt

```
2013/11/22 18:15:26 2c9e825beb3b2c37d0a4d9c5625e10384bc6433c4a08a19b2092820a783bae4a: Failed to umount filesystem: Umount: Failed to umount /var/lib/docker/containers/2c9e825beb3b2c37d0a4d9c5625e10384bc6433c
4a08a19b2092820a783bae4a/rootfs
panic: runtime error: close of closed channel

goroutine 24 [running]:
runtime.panic(0x8eb1e0, 0x101f915)
        /usr/local/go/src/pkg/runtime/panic.c:266 +0xb6
github.com/dotcloud/docker.(*Container).monitor(0xc210062c40)
        /go/src/github.com/dotcloud/docker/container.go:1232 +0x512
created by github.com/dotcloud/docker.(*Container).Start
        /go/src/github.com/dotcloud/docker/container.go:990 +0x24f8

goroutine 1 [chan receive]:
github.com/dotcloud/docker.(*Server).Daemon(0xc2100baf00, 0x0, 0x0)
        /go/src/github.com/dotcloud/docker/server.go:91 +0x682
github.com/dotcloud/docker.JobServeApi(0xc21000b2d0, 0x0, 0x0)
        /go/src/github.com/dotcloud/docker/server.go:45 +0xaf
github.com/dotcloud/docker/engine.(*Job).Run(0xc21000b2d0, 0x0, 0x0)
        /go/src/github.com/dotcloud/docker/engine/job.go:46 +0x45d
main.main()
        /go/src/github.com/dotcloud/docker/docker/docker.go:85 +0x11e3

goroutine 3 [syscall]:
os/signal.loop()
        /usr/local/go/src/pkg/os/signal/signal_unix.go:21 +0x1e
created by os/signal.init·1
        /usr/local/go/src/pkg/os/signal/signal_unix.go:27 +0x31

goroutine 5 [select]:
github.com/dotcloud/docker.(*IPAllocator).run(0xc2100ab090)
        /go/src/github.com/dotcloud/docker/network.go:434 +0x377
created by github.com/dotcloud/docker.newIPAllocator
        /go/src/github.com/dotcloud/docker/network.go:488 +0xdd

goroutine 6 [select]:
github.com/dotcloud/docker.(*PortAllocator).runFountain(0xc210084c20)
        /go/src/github.com/dotcloud/docker/network.go:327 +0xc4
created by github.com/dotcloud/docker.newPortAllocator
        /go/src/github.com/dotcloud/docker/network.go:380 +0xc8

goroutine 7 [select]:
github.com/dotcloud/docker.(*PortAllocator).runFountain(0xc210084c40)
        /go/src/github.com/dotcloud/docker/network.go:327 +0xc4
created by github.com/dotcloud/docker.newPortAllocator
        /go/src/github.com/dotcloud/docker/network.go:380 +0xc8

goroutine 8 [chan receive]:
database/sql.(*DB).connectionOpener(0xc2100a2080)
        /usr/local/go/src/pkg/database/sql/sql.go:574 +0x3e
created by database/sql.Open
        /usr/local/go/src/pkg/database/sql/sql.go:436 +0x24d

goroutine 10 [syscall]:
runtime.goexit()
        /usr/local/go/src/pkg/runtime/proc.c:1394

goroutine 40 [chan receive]:
github.com/dotcloud/docker.func·046()
        /go/src/github.com/dotcloud/docker/server.go:63 +0x3b
created by github.com/dotcloud/docker.(*Server).Daemon
        /go/src/github.com/dotcloud/docker/server.go:68 +0x2c9

goroutine 41 [IO wait]:
net.runtime_pollWait(0x7fa2e5f962a8, 0x72, 0x0)
        /usr/local/go/src/pkg/runtime/netpoll.goc:116 +0x6a
net.(*pollDesc).Wait(0xc210134a70, 0x72, 0x7fa2e5f94110, 0xb)
        /usr/local/go/src/pkg/net/fd_poll_runtime.go:81 +0x34
net.(*pollDesc).WaitRead(0xc210134a70, 0xb, 0x7fa2e5f94110)
        /usr/local/go/src/pkg/net/fd_poll_runtime.go:86 +0x30
net.(*netFD).accept(0xc210134a10, 0xa2de68, 0x0, 0x7fa2e5f94110, 0xb)
        /usr/local/go/src/pkg/net/fd_unix.go:382 +0x2c2
net.(*UnixListener).AcceptUnix(0xc21000a9a0, 0x58dcbb, 0x7fa2e5e02d90, 0x58dcbb)
        /usr/local/go/src/pkg/net/unixsock_posix.go:283 +0x4b
net.(*UnixListener).Accept(0xc21000a9a0, 0x0, 0x0, 0x0, 0x0)
        /usr/local/go/src/pkg/net/unixsock_posix.go:294 +0x4b
net/http.(*Server).Serve(0xc2100e9be0, 0x7fa2e5f9c0d0, 0xc21000a9a0, 0x0, 0x0)
        /usr/local/go/src/pkg/net/http/server.go:1622 +0x91
github.com/dotcloud/docker.ListenAndServe(0xc210081e60, 0x4, 0xc210081e67, 0x14, 0xc2100baf00, ...)
        /go/src/github.com/dotcloud/docker/api.go:1136 +0x57c
github.com/dotcloud/docker.func·047()
        /go/src/github.com/dotcloud/docker/server.go:87 +0x89
created by github.com/dotcloud/docker.(*Server).Daemon
        /go/src/github.com/dotcloud/docker/server.go:88 +0x633

goroutine 26 [finalizer wait]:
runtime.park(0x411c30, 0x1038f50, 0x1021988)
        /usr/local/go/src/pkg/runtime/proc.c:1342 +0x66
runfinq()
        /usr/local/go/src/pkg/runtime/mgc0.c:2276 +0x84
runtime.goexit()
        /usr/local/go/src/pkg/runtime/proc.c:1394

goroutine 34 [sleep]:
time.Sleep(0x989680)
        /usr/local/go/src/pkg/runtime/time.goc:31 +0x31
github.com/dotcloud/docker.Unmount(0xc2100b80e0, 0x62, 0x62, 0xc2100ba730)
        /go/src/github.com/dotcloud/docker/mount.go:33 +0x291
github.com/dotcloud/docker.(*Container).Unmount(0xc210062a80, 0x0, 0x0)
        /go/src/github.com/dotcloud/docker/container.go:1442 +0xc8
github.com/dotcloud/docker.(*Container).cleanup(0xc210062a80)
        /go/src/github.com/dotcloud/docker/container.go:1273 +0x617
github.com/dotcloud/docker.(*Container).monitor(0xc210062a80)
        /go/src/github.com/dotcloud/docker/container.go:1224 +0x482
created by github.com/dotcloud/docker.(*Container).Start
        /go/src/github.com/dotcloud/docker/container.go:990 +0x24f8
```