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DOCKER_CLI_EXPERIMENTAL="1" docker version fails with panic #2543

Description

@qoo2p5

DOCKER_CLI_EXPERIMENTAL="1" docker version fails with panic.

Steps to reproduce the issue:

  1. git clone https://github.com/docker/cli.git && cd cli
  2. make -f docker.Makefile shell
  3. make binary
  4. DOCKER_CLI_EXPERIMENTAL="1" ./build/docker-linux-amd64

Describe the results you received:

[signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0xa275dd]

goroutine 1 [running]:
github.com/docker/cli/cli/command.(*DockerCli).ClientInfo(...)
	/go/src/github.com/docker/cli/cli/command/cli.go:149
github.com/docker/cli/cli/command.(*DockerCli).DefaultVersion(0xc0003b69c0, 0xc00014e7fc, 0x4)
	/go/src/github.com/docker/cli/cli/command/cli.go:89 +0x2d
github.com/docker/cli/cli/command/system.runVersion(0x20bff80, 0xc0003b69c0, 0xc00032b220, 0x0, 0x0)
	/go/src/github.com/docker/cli/cli/command/system/version.go:145 +0x123
github.com/docker/cli/cli/command/system.NewVersionCommand.func1(0xc0005f4dc0, 0x3075708, 0x0, 0x0, 0x0, 0x0)
	/go/src/github.com/docker/cli/cli/command/system/version.go:108 +0x3c
github.com/docker/cli/vendor/github.com/spf13/cobra.(*Command).execute(0xc0005f4dc0, 0xc0005b1430, 0x0, 0x0, 0xc0005f4dc0, 0xc0005b1430)
	/go/src/github.com/docker/cli/vendor/github.com/spf13/cobra/command.go:842 +0x460
github.com/docker/cli/vendor/github.com/spf13/cobra.(*Command).ExecuteC(0xc000414580, 0xc0005b1430, 0x1, 0x1)
	/go/src/github.com/docker/cli/vendor/github.com/spf13/cobra/command.go:950 +0x349
github.com/docker/cli/vendor/github.com/spf13/cobra.(*Command).Execute(...)
	/go/src/github.com/docker/cli/vendor/github.com/spf13/cobra/command.go:887
main.runDocker(0xc0003b69c0, 0x202c2a0, 0xc00000e020)
	/go/src/github.com/docker/cli/cmd/docker/docker.go:281 +0x1d1
main.main()
	/go/src/github.com/docker/cli/cmd/docker/docker.go:292 +0xf1

Describe the results you expected:

Experimental field: "1" is not valid, should be either enabled or disabled

Additional information you deem important (e.g. issue happens only occasionally):

None

Output of docker version:

Client:
 Version:           20.03.0-dev
 API version:       1.40
 Go version:        go1.13.11
 Git commit:        590f3271ef
 Built:             Sun May 24 19:44:56 2020
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.9
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.13.10
  Git commit:       9d988398e7
  Built:            Fri May 15 00:23:50 2020
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.2.13
  GitCommit:        7ad184331fa3e55e52b890ea95e65ba581ae3429
 runc:
  Version:          1.0.0-rc10
  GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683

Output of docker info:

Client:
 Context:    default
 Debug Mode: false

Server:
 Containers: 20
  Running: 1
  Paused: 0
  Stopped: 19
 Images: 78
 Server Version: 19.03.9
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 7ad184331fa3e55e52b890ea95e65ba581ae3429
 runc version: dc9208a3303feef5b3839f4323d9beb36df0a9dd
 init version: fec3683
 Security Options:
  apparmor
  seccomp
   Profile: default
 Kernel Version: 5.4.0-050400-generic
 Operating System: Ubuntu 18.04.4 LTS
 OSType: linux
 Architecture: x86_64
 CPUs: 20
 Total Memory: 31.41GiB
 Name: **hidden**
 ID: **hidden**
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

WARNING: No swap limit support

Additional environment details (AWS, VirtualBox, physical, etc.):

Doesn't matter.

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