Panic (invalid memory address or nil pointer dereference) when --component=node receives ControllerGetCapabilities

[n9]

I have misconfigured the driver: set --component=node for a controller.

And the container failed:

I0811 15:11:20.922168 main.go:72 will run node: true, controller: false, attacher: true
I0811 15:11:20.922220 main.go:78 connect to filer http://filer.seaweed:80
I0811 15:11:20.922228 driver.go:57 Driver: seaweedfs-csi-driver version: 1.0.0
I0811 15:11:20.924703 config.go:46 Reading : Config File "security" Not Found in "[/ /root/.seaweedfs /usr/local/etc/seaweedfs /etc/seaweedfs]"
I0811 15:11:20.924845 driver.go:131 Enabling volume access mode: MULTI_NODE_MULTI_WRITER
I0811 15:11:20.924853 driver.go:131 Enabling volume access mode: SINGLE_NODE_WRITER
I0811 15:11:20.924856 driver.go:131 Enabling volume access mode: SINGLE_NODE_MULTI_WRITER
I0811 15:11:20.924859 driver.go:131 Enabling volume access mode: SINGLE_NODE_SINGLE_WRITER
I0811 15:11:20.924882 driver.go:138 Enabling controller service capability: CREATE_DELETE_VOLUME
I0811 15:11:20.924886 driver.go:138 Enabling controller service capability: SINGLE_NODE_MULTI_WRITER
I0811 15:11:20.924889 driver.go:138 Enabling controller service capability: EXPAND_VOLUME
I0811 15:11:20.924892 driver.go:138 Enabling controller service capability: PUBLISH_UNPUBLISH_VOLUME
I0811 15:11:20.924896 driver.go:94 starting
I0811 15:11:20.925373 server.go:92 Listening for connections on address: &net.UnixAddr{Name:"/csi-socket/csi.sock", Net:"unix"}
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xb297be]

goroutine 55 [running]:
github.com/seaweedfs/seaweedfs-csi-driver/pkg/driver.(*ControllerServer).ControllerGetCapabilities(0x0, {0xc0000bb940?, 0x40da07?}, 0x10?)
	/go/src/github.com/seaweedfs/seaweedfs-csi-driver/pkg/driver/controllerserver.go:179 +0x5e
github.com/container-storage-interface/spec/lib/go/csi._Controller_ControllerGetCapabilities_Handler.func1({0xe08db0, 0xc00026a0c0}, {0xc784c0?, 0xc000074920})
	/go/pkg/mod/github.com/container-storage-interface/[email protected]/lib/go/csi/csi.pb.go:6546 +0x78
github.com/seaweedfs/seaweedfs-csi-driver/pkg/driver.logGRPC({0xe08db0, 0xc00026a0c0}, {0xc784c0, 0xc000074920}, 0xc000074940, 0xc000268108)
	/go/src/github.com/seaweedfs/seaweedfs-csi-driver/pkg/driver/utils.go:64 +0x132
github.com/container-storage-interface/spec/lib/go/csi._Controller_ControllerGetCapabilities_Handler({0xca5680?, 0x0}, {0xe08db0, 0xc00026a0c0}, 0xc000226d90, 0xd3fc50)
	/go/pkg/mod/github.com/container-storage-interface/[email protected]/lib/go/csi/csi.pb.go:6548 +0x138
google.golang.org/grpc.(*Server).processUnaryRPC(0xc0001523c0, {0xe0d1a0, 0xc0002421a0}, 0xc000206360, 0xc00032c6c0, 0x1350aa8, 0x0)
	/go/pkg/mod/google.golang.org/[email protected]/server.go:1360 +0xe23
google.golang.org/grpc.(*Server).handleStream(0xc0001523c0, {0xe0d1a0, 0xc0002421a0}, 0xc000206360, 0x0)
	/go/pkg/mod/google.golang.org/[email protected]/server.go:1737 +0xa36
google.golang.org/grpc.(*Server).serveStreams.func1.1()
	/go/pkg/mod/google.golang.org/[email protected]/server.go:982 +0x98
created by google.golang.org/grpc.(*Server).serveStreams.func1
	/go/pkg/mod/google.golang.org/[email protected]/server.go:980 +0x18c

I assume from the log that the provisioner sidecar called ControllerGetCapabilities. And the call failed on nil pointer dereference.
Line controllerserver.go:179 contains:

seaweedfs-csi-driver/pkg/driver/controllerserver.go

Line 179 in 1a149fe

Capabilities: cs.Driver.cscap,

The log contains 0x0:

github.com/seaweedfs/seaweedfs-csi-driver/pkg/driver.(*ControllerServer).ControllerGetCapabilities(0x0, {0xc0000bb940?, 0x40da07?}, 0x10?)

The first "argument" is cs:

seaweedfs-csi-driver/pkg/driver/controllerserver.go

Line 175 in 1a149fe

func (cs *ControllerServer) ControllerGetCapabilities(ctx context.Context, req *csi.ControllerGetCapabilitiesRequest) (*csi.ControllerGetCapabilitiesResponse, error) {

Therefore, it seems to me that cs is nil.

But as I used just --component=node (without --component=controller) this service should not be registered:

seaweedfs-csi-driver/pkg/driver/server.go

Lines 85 to 90 in 1a149fe

	if cs != nil {
	csi.RegisterControllerServer(server, cs)
	}
	if ns != nil {
	csi.RegisterNodeServer(server, ns)
	}

(I am not a real golang dev, but I would expect that it should fail with unknown gRPC method and not panic on invalid memory address or nil pointer dereference.)

Are the conditions above correct?

Or why gRPC called this method even if it has {not⁉} been registered?