Jun 05 17:06:26 ubuntu dockerd[21486]: time="2017-06-05T17:06:26.222068186-07:00" level=debug msg="Calling POST /v1.30/networks/create"
Jun 05 17:06:26 ubuntu dockerd[21486]: time="2017-06-05T17:06:26.222312544-07:00" level=debug msg="form data: {\"Attachable\":false,\"CheckDuplicate\":true,\"ConfigFrom\":null,\"ConfigOnly\":false,\"Driver\":\"overlay\",\"EnableIPv6\":false,\"IPAM\":null,\"Ingress\":false,\"Internal\":false,\"Labels\":null,\"Name\":\"TestInternalLB291dd285-5d02-4ed6-adfb-ab674e888299\",\"Options\":null,\"Scope\":\"\"}"
Jun 05 17:06:26 ubuntu dockerd[21486]: panic: runtime error: invalid memory address or nil pointer dereference
Jun 05 17:06:26 ubuntu dockerd[21486]: [signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x12655b2]
Jun 05 17:06:26 ubuntu dockerd[21486]: goroutine 4680 [running]:
Jun 05 17:06:26 ubuntu dockerd[21486]: github.com/docker/docker/vendor/github.com/docker/swarmkit/manager/allocator.(*Allocator).IsBuiltInNetworkDriver(0x0, 0xc42126f694, 0x7, 0x0)
Jun 05 17:06:26 ubuntu dockerd[21486]:         /go/src/github.com/docker/docker/vendor/github.com/docker/swarmkit/manager/allocator/network.go:1077 +0x22
Jun 05 17:06:26 ubuntu dockerd[21486]: github.com/docker/docker/vendor/github.com/docker/swarmkit/manager/controlapi.validateDriver(0xc4214a7560, 0x0, 0x2713b60, 0xc42042fe60, 0x1ab1692, 0xd, 0x0, 0x0)
Jun 05 17:06:26 ubuntu dockerd[21486]:         /go/src/github.com/docker/docker/vendor/github.com/docker/swarmkit/manager/controlapi/common.go:114 +0x81
Jun 05 17:06:26 ubuntu dockerd[21486]: github.com/docker/docker/vendor/github.com/docker/swarmkit/manager/controlapi.validateNetworkSpec(0xc421b8cf00, 0x0, 0x2713b60, 0xc42042fe60, 0xc4216c1988, 0xed0e0a)
Jun 05 17:06:26 ubuntu dockerd[21486]:         /go/src/github.com/docker/docker/vendor/github.com/docker/swarmkit/manager/controlapi/network.go:95 +0x1b7
Jun 05 17:06:26 ubuntu dockerd[21486]: github.com/docker/docker/vendor/github.com/docker/swarmkit/manager/controlapi.(*Server).CreateNetwork(0xc421097780, 0x7f42e23b1128, 0xc421e42fc0, 0xc422602770, 0x1, 0x1, 0x7f42e23b1128)
Jun 05 17:06:26 ubuntu dockerd[21486]:         /go/src/github.com/docker/docker/vendor/github.com/docker/swarmkit/manager/controlapi/network.go:110 +0x58
Jun 05 17:06:26 ubuntu dockerd[21486]: github.com/docker/docker/vendor/github.com/docker/swarmkit/api.(*raftProxyControlServer).CreateNetwork(0xc42037b9a0, 0x7f42e23b1128, 0xc421e42f30, 0xc422602770, 0xc42037b9a0, 0x1aec295, 0xd)
Jun 05 17:06:26 ubuntu dockerd[21486]:         /go/src/github.com/docker/docker/vendor/github.com/docker/swarmkit/api/control.pb.go:6423 +0x1bb
Jun 05 17:06:26 ubuntu dockerd[21486]: github.com/docker/docker/vendor/github.com/docker/swarmkit/api._Control_CreateNetwork_Handler.func1(0x7f42e23b1128, 0xc421e42f30, 0x1993940, 0xc422602770, 0xc42270fae0, 0xc420341540, 0xc42126f6a0, 0xc421ce1af8)
Jun 05 17:06:26 ubuntu dockerd[21486]:         /go/src/github.com/docker/docker/vendor/github.com/docker/swarmkit/api/control.pb.go:3092 +0x86
Jun 05 17:06:26 ubuntu dockerd[21486]: github.com/docker/docker/vendor/github.com/grpc-ecosystem/go-grpc-prometheus.UnaryServerInterceptor(0x7f42e23b1128, 0xc421e42f30, 0x1993940, 0xc422602770, 0xc4214a75a0, 0xc4214a75c0, 0x0, 0xc421ce1b70, 0x4124a8, 0x50)
Jun 05 17:06:26 ubuntu dockerd[21486]:         /go/src/github.com/docker/docker/vendor/github.com/grpc-ecosystem/go-grpc-prometheus/server.go:29 +0xa4
Jun 05 17:06:26 ubuntu dockerd[21486]: github.com/docker/docker/vendor/github.com/docker/swarmkit/api._Control_CreateNetwork_Handler(0x1a778a0, 0xc42037b9a0, 0x7f42e23b1128, 0xc421e42f30, 0xc42270fa90, 0x1b30018, 0x0, 0x0, 0x2761f80, 0x1209)
Jun 05 17:06:26 ubuntu dockerd[21486]:         /go/src/github.com/docker/docker/vendor/github.com/docker/swarmkit/api/control.pb.go:3094 +0x177
Jun 05 17:06:26 ubuntu dockerd[21486]: github.com/docker/docker/vendor/google.golang.org/grpc.(*Server).processUnaryRPC(0xc420341500, 0x271a860, 0xc4201b6000, 0xc422702d20, 0xc420ac5530, 0x26e8150, 0xc421e42f00, 0x0, 0x0)
Jun 05 17:06:26 ubuntu dockerd[21486]:         /go/src/github.com/docker/docker/vendor/google.golang.org/grpc/server.go:638 +0xb5c
Jun 05 17:06:26 ubuntu dockerd[21486]: github.com/docker/docker/vendor/google.golang.org/grpc.(*Server).handleStream(0xc420341500, 0x271a860, 0xc4201b6000, 0xc422702d20, 0xc421e42f00)
Jun 05 17:06:26 ubuntu dockerd[21486]:         /go/src/github.com/docker/docker/vendor/google.golang.org/grpc/server.go:796 +0x1261
Jun 05 17:06:26 ubuntu dockerd[21486]: github.com/docker/docker/vendor/google.golang.org/grpc.(*Server).serveStreams.func1.1(0xc420a44b00, 0xc420341500, 0x271a860, 0xc4201b6000, 0xc422702d20)
Jun 05 17:06:26 ubuntu dockerd[21486]:         /go/src/github.com/docker/docker/vendor/google.golang.org/grpc/server.go:449 +0xa9
Jun 05 17:06:26 ubuntu dockerd[21486]: created by github.com/docker/docker/vendor/google.golang.org/grpc.(*Server).serveStreams.func1
Jun 05 17:06:26 ubuntu dockerd[21486]:         /go/src/github.com/docker/docker/vendor/google.golang.org/grpc/server.go:450 +0xa1
Jun 05 17:06:26 ubuntu systemd[1]: docker.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
Jun 05 17:06:26 ubuntu systemd[1]: docker.service: Unit entered failed state.
Jun 05 17:06:26 ubuntu systemd[1]: docker.service: Failed with result 'exit-code'.
Jun 05 17:06:26 ubuntu systemd[1]: docker.service: Service hold-off time over, scheduling restart.
Jun 05 17:06:26 ubuntu systemd[1]: Stopped Docker Application Container Engine.

func (a *Allocator) IsBuiltInNetworkDriver(name string) bool {
	return a.netCtx.nwkAllocator.IsBuiltInDriver(name)
}