[Regression 2025-08-26] `- vzNAT: true` produces error `inspecting instance: [field networks[0].lima or field networks[0].socket must be set]`

[norio-nomura]

Description

With following entry in lima.yaml:

networks:
- vzNAT: true

limactl start prints error:

$ limactl start docker
WARN[0000] Both top-level 'rosetta' and 'vmOpts.vz.rosetta' are configured. Using vmOpts.vz.rosetta. Top-level 'rosetta' is deprecated. 
INFO[0000] Using the existing instance "docker"         
FATA[0000] errors inspecting instance: [field `networks[0].lima` or  field `networks[0].socket must be set] 

[AkihiroSuda]

Is this a recent regression?

[norio-nomura]

6aceec3 causes this.
That also broke limactl prune, limactl restart:

➜ ~14:28:10 14:28:21~ ((6aceec31)) limactl prune --keep-referred 
WARN[0000] Both top-level 'rosetta' and 'vmOpts.vz.rosetta' are configured. Using vmOpts.vz.rosetta. Top-level 'rosetta' is deprecated. 
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x58 pc=0x103051cbc]

goroutine 1 [running]:
main.locationsFromLimaYAML(0x0)
	/Users/norio/ghq/github.com/lima-vm/lima/cmd/limactl/prune.go:110 +0x2c
main.knownLocations({0x103642cb0, 0x104648f60})
	/Users/norio/ghq/github.com/lima-vm/lima/cmd/limactl/prune.go:83 +0x90
main.pruneAction(0x140004f5b08?, {0x140004d8900?, 0x4?, 0x1030bd571?})
	/Users/norio/ghq/github.com/lima-vm/lima/cmd/limactl/prune.go:52 +0xbc
github.com/spf13/cobra.(*Command).execute(0x140004f5b08, {0x140004d88e0, 0x2, 0x2})
	/Users/norio/go/pkg/mod/github.com/spf13/cobra@v1.9.1/command.go:1015 +0x7d4
github.com/spf13/cobra.(*Command).ExecuteC(0x140004f4008)
	/Users/norio/go/pkg/mod/github.com/spf13/cobra@v1.9.1/command.go:1148 +0x350
github.com/spf13/cobra.(*Command).Execute(...)
	/Users/norio/go/pkg/mod/github.com/spf13/cobra@v1.9.1/command.go:1071
main.executeWithPluginSupport(0x140004f4008?, {0x14000142010?, 0x3?, 0x3?})
	/Users/norio/ghq/github.com/lima-vm/lima/cmd/limactl/main.go:227 +0xbc
main.main()
	/Users/norio/ghq/github.com/lima-vm/lima/cmd/limactl/main.go:46 +0x54
➜ ~14:28:21 14:28:58~ ((6aceec31)) limactl restart docker
WARN[0000] Both top-level 'rosetta' and 'vmOpts.vz.rosetta' are configured. Using vmOpts.vz.rosetta. Top-level 'rosetta' is deprecated. 
WARN[0000] The instance is not running, continuing with the restart 
WARN[0000] Both top-level 'rosetta' and 'vmOpts.vz.rosetta' are configured. Using vmOpts.vz.rosetta. Top-level 'rosetta' is deprecated. 
INFO[0000] Starting the instance "docker" with  VM driver "" 
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x298 pc=0x1051ba650]

goroutine 1 [running]:
github.com/lima-vm/lima/v2/pkg/instance.Prepare({0x1058cecb0, 0x1068d4f60}, 0x14000568140)
	/Users/norio/ghq/github.com/lima-vm/lima/pkg/instance/start.go:84 +0x30
github.com/lima-vm/lima/v2/pkg/instance.Start({0x1058cecb0, 0x1068d4f60}, 0x14000568140, {0x0, 0x0}, 0x0, 0x0)
	/Users/norio/ghq/github.com/lima-vm/lima/pkg/instance/start.go:191 +0x1ac
github.com/lima-vm/lima/v2/pkg/instance.Restart({0x1058cecb0, 0x1068d4f60}, 0x14000568140)
	/Users/norio/ghq/github.com/lima-vm/lima/pkg/instance/restart.go:29 +0x68
main.restartAction(0x1400058db08, {0x1400054e960?, 0x4?, 0x105349571?})
	/Users/norio/ghq/github.com/lima-vm/lima/cmd/limactl/restart.go:48 +0xf0
github.com/spf13/cobra.(*Command).execute(0x1400058db08, {0x1400054e940, 0x2, 0x2})
	/Users/norio/go/pkg/mod/github.com/spf13/cobra@v1.9.1/command.go:1015 +0x7d4
github.com/spf13/cobra.(*Command).ExecuteC(0x1400056c008)
	/Users/norio/go/pkg/mod/github.com/spf13/cobra@v1.9.1/command.go:1148 +0x350
github.com/spf13/cobra.(*Command).Execute(...)
	/Users/norio/go/pkg/mod/github.com/spf13/cobra@v1.9.1/command.go:1071
main.executeWithPluginSupport(0x1400056c008?, {0x140001ba010?, 0x3?, 0x3?})
	/Users/norio/ghq/github.com/lima-vm/lima/cmd/limactl/main.go:227 +0xbc
main.main()
	/Users/norio/ghq/github.com/lima-vm/lima/cmd/limactl/main.go:46 +0x54

[norio-nomura]

limactl edit too:

$ ./hack/update-template.sh templates/_images/centos-stream-9.yaml
Processing templates/_images/centos-stream-9.yaml
{
  "location": "https://cloud.centos.org/centos/9-stream/x86_64/images/CentOS-Stream-GenericCloud-9-20250825.1.x86_64.qcow2",
  "arch": "x86_64",
  "digest": "sha256:54b86ad383c7ccdb296771acfe281b2d6cb130ada6c062f98374779834e21025"
}
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x104c5dd18]

goroutine 1 [running]:
github.com/lima-vm/lima/v2/pkg/driver/vz.(*LimaVzDriver).Validate(0x1400056b5c0, {0x0?, 0x0?})
	/Users/norio/ghq/github.com/lima-vm/lima/pkg/driver/vz/vz_driver_darwin.go:232 +0x198
github.com/lima-vm/lima/v2/pkg/driver/vz.(*LimaVzDriver).AcceptConfig(0x1400056b5c0, 0x140005abb08, {0x14000451c70?, 0x105025200?})
	/Users/norio/ghq/github.com/lima-vm/lima/pkg/driver/vz/vz_driver_darwin.go:208 +0x3a8
github.com/lima-vm/lima/v2/pkg/driverutil.validateConfigAgainstDriver(0x140005abb08, {0x14000451c70, 0x4f}, {0x104cf6b30, 0x2})
	/Users/norio/ghq/github.com/lima-vm/lima/pkg/driverutil/vm.go:41 +0x60
github.com/lima-vm/lima/v2/pkg/driverutil.ResolveVMType(0x105284170?, {0x14000451c70?, 0x140000c2800?})
	/Users/norio/ghq/github.com/lima-vm/lima/pkg/driverutil/vm.go:28 +0xd4
main.editAction(0x1400058cf08, {0x1400056c280?, 0x4?, 0x104cf7b16?})
	/Users/norio/ghq/github.com/lima-vm/lima/cmd/limactl/edit.go:124 +0x3e4
github.com/spf13/cobra.(*Command).execute(0x1400058cf08, {0x1400056c230, 0x5, 0x5})
	/Users/norio/go/pkg/mod/github.com/spf13/cobra@v1.9.1/command.go:1015 +0x7d4
github.com/spf13/cobra.(*Command).ExecuteC(0x1400057c008)
	/Users/norio/go/pkg/mod/github.com/spf13/cobra@v1.9.1/command.go:1148 +0x350
github.com/spf13/cobra.(*Command).Execute(...)
	/Users/norio/go/pkg/mod/github.com/spf13/cobra@v1.9.1/command.go:1071
main.executeWithPluginSupport(0x1400057c008?, {0x140001c0010?, 0x6?, 0x6?})
	/Users/norio/ghq/github.com/lima-vm/lima/cmd/limactl/main.go:249 +0xbc
main.main()
	/Users/norio/ghq/github.com/lima-vm/lima/cmd/limactl/main.go:68 +0xd8

[norio-nomura]

I have not done anything against these regressions.