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Fails to start due to invalid memory address or nil pointer dereference #80

@SliceCraft

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@SliceCraft

I've been using wsl2host for a few months now and it worked fine until I noticed it was acting weird today.
Multiple times today I've had issues where a domain isn't pointing to an ip.
While checking the event viewer I noticed a lot of errors.
I assumed this might have to do with an update so I ran build.bat on the latest commit and used that executable to try again.
Unfortunately without any luck.
Below the output of 3 separate attempts at running wsl2host debug.

C:\Users\Slice\Documents\wsl2host>wsl2host.exe debug
wsl2host.info(1): starting wsl2host service
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x0 pc=0xfcccd7]

goroutine 1 [running]:
github.com/shayne/go-wsl2-host/cmd/wsl2host/pkg/service.updateHostIP({0x102fc68, 0xc000040640}, {0xc0001c0038, 0x1, 0xc00007bc58?})
        C:/Users/Slice/Documents/wsl2host/git/go-wsl2-host/cmd/wsl2host/pkg/service/service.go:109 +0x437
github.com/shayne/go-wsl2-host/cmd/wsl2host/pkg/service.Run({0x102fc68, 0xc000040640})
        C:/Users/Slice/Documents/wsl2host/git/go-wsl2-host/cmd/wsl2host/pkg/service/service.go:40 +0x76
github.com/shayne/go-wsl2-host/cmd/wsl2host/internal.(*windowserver).Execute(0xc0000521e0?, {0xc000040660, 0x1, 0x1}, 0xc000052120, 0x4?)
        C:/Users/Slice/Documents/wsl2host/git/go-wsl2-host/cmd/wsl2host/internal/service.go:34 +0x2f8
golang.org/x/sys/windows/svc/debug.Run({0xffb213, 0x8}, {0x102f628, 0x113e5b8})
        C:/Users/Slice/go/pkg/mod/golang.org/x/sys@v0.0.0-20190626221950-04f50cda93cb/windows/svc/debug/service.go:40 +0x144
github.com/shayne/go-wsl2-host/cmd/wsl2host/internal.RunService({0xffb213, 0x8}, 0x1)
        C:/Users/Slice/Documents/wsl2host/git/go-wsl2-host/cmd/wsl2host/internal/service.go:82 +0x210
main.main()
        C:/Users/Slice/Documents/wsl2host/git/go-wsl2-host/cmd/wsl2host/main.go:42 +0x14e

C:\Users\Slice\Documents\wsl2host>wsl2host.exe debug
wsl2host.info(1): starting wsl2host service
wsl2host.error(1): failed to get infos: failed to get IP for distro "Ubuntu": exit status 1
wsl2host.error(1): failed to get infos: failed to get IP for distro "Ubuntu": exit status 1
wsl2host.error(1): failed to get infos: failed to get IP for distro "Ubuntu": exit status 1
wsl2host.error(1): failed to get infos: failed to get IP for distro "Ubuntu": exit status 1
wsl2host.error(1): failed to get infos: failed to get IP for distro "Ubuntu": exit status 1
wsl2host.error(1): failed to get infos: failed to get IP for distro "Ubuntu": exit status 1
wsl2host.error(1): failed to get infos: failed to get IP for distro "Ubuntu": exit status 1
wsl2host.error(1): failed to get infos: failed to get IP for distro "Ubuntu": exit status 1
wsl2host.error(1): failed to get infos: failed to get IP for distro "Ubuntu": exit status 1
wsl2host.error(1): failed to get infos: failed to get IP for distro "Ubuntu": exit status 1
wsl2host.error(1): failed to get infos: failed to get IP for distro "Ubuntu": exit status 1
wsl2host.error(1): failed to get infos: failed to get IP for distro "Ubuntu": exit status 1
wsl2host.info(1): wsl2host-0
wsl2host.info(1): wsl2host service stopped

C:\Users\Slice\Documents\wsl2host>wsl2host.exe debug
wsl2host.info(1): starting wsl2host service
wsl2host.error(1): failed to get infos: failed to get IP for distro "Ubuntu": exit status 1
wsl2host.error(1): failed to get infos: failed to get IP for distro "Ubuntu": exit status 1
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x0 pc=0xfcccd7]

goroutine 1 [running]:
github.com/shayne/go-wsl2-host/cmd/wsl2host/pkg/service.updateHostIP({0x102fc68, 0xc000040640}, {0xc00000a070, 0x1, 0xffa39a?})
        C:/Users/Slice/Documents/wsl2host/git/go-wsl2-host/cmd/wsl2host/pkg/service/service.go:109 +0x437
github.com/shayne/go-wsl2-host/cmd/wsl2host/pkg/service.Run({0x102fc68, 0xc000040640})
        C:/Users/Slice/Documents/wsl2host/git/go-wsl2-host/cmd/wsl2host/pkg/service/service.go:40 +0x76
github.com/shayne/go-wsl2-host/cmd/wsl2host/internal.(*windowserver).Execute(0xc0000521e0?, {0xc000040660, 0x1, 0x1}, 0xc000052120, 0x4?)
        C:/Users/Slice/Documents/wsl2host/git/go-wsl2-host/cmd/wsl2host/internal/service.go:34 +0x2f8
golang.org/x/sys/windows/svc/debug.Run({0xffb213, 0x8}, {0x102f628, 0x113e5b8})
        C:/Users/Slice/go/pkg/mod/golang.org/x/sys@v0.0.0-20190626221950-04f50cda93cb/windows/svc/debug/service.go:40 +0x144
github.com/shayne/go-wsl2-host/cmd/wsl2host/internal.RunService({0xffb213, 0x8}, 0x1)
        C:/Users/Slice/Documents/wsl2host/git/go-wsl2-host/cmd/wsl2host/internal/service.go:82 +0x210
main.main()
        C:/Users/Slice/Documents/wsl2host/git/go-wsl2-host/cmd/wsl2host/main.go:42 +0x14e

C:\Users\Slice\Documents\wsl2host>

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