segmentation violation while dep ensure

[sas1024]

1. What version of Go are you using (go version)?
   go 1.8.1

2. What operating system and processor architecture are you using?
   Darwin/amd64

3. What did you do?
   I was updated my package and want to update this package dependency in another project.

4. What did you expect to see?
   dep ensure working.

5. What did you see instead?

$ dep ensure gitlab.devim.team/microservices/employeesvc@master

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x114d608]

goroutine 1 [running]:
github.com/golang/dep/internal/gps/pkgtree.wmToReach.func3(0xc4202bf6e0, 0x1, 0x1, 0xc42033eac1, 0x37)
        /Users/sas1024/dev/golang/src/github.com/golang/dep/internal/gps/pkgtree/pkgtree.go:632 +0x78
github.com/golang/dep/internal/gps/pkgtree.wmToReach.func4(0xc42033eac1, 0x37, 0xc4202bf6e0, 0x1, 0x1, 0xc4202bf601)
        /Users/sas1024/dev/golang/src/github.com/golang/dep/internal/gps/pkgtree/pkgtree.go:771 +0x462
github.com/golang/dep/internal/gps/pkgtree.wmToReach.func4(0xc42033e940, 0x3a, 0xc4202bf6e0, 0x1, 0x1, 0x0)
        /Users/sas1024/dev/golang/src/github.com/golang/dep/internal/gps/pkgtree/pkgtree.go:728 +0xd08
github.com/golang/dep/internal/gps/pkgtree.wmToReach(0xc420552238, 0xc420552201, 0xc4205521f8, 0xc4201704c8)
        /Users/sas1024/dev/golang/src/github.com/golang/dep/internal/gps/pkgtree/pkgtree.go:810 +0xd1c
github.com/golang/dep/internal/gps/pkgtree.PackageTree.ToReachMap(0xc420197a40, 0x2b, 0xc420223b60, 0x10001, 0xc420228390, 0x167f520, 0xc42045f5a0)
        /Users/sas1024/dev/golang/src/github.com/golang/dep/internal/gps/pkgtree/pkgtree.go:501 +0x2c0
github.com/golang/dep/internal/gps.(*solver).getImportsAndConstraintsOf(0xc42019a000, 0xc420197a40, 0x2b, 0x0, 0x0, 0x167f520, 0xc42045f5a0, 0xc420383f80, 0x3, 0x4, ...)
        /Users/sas1024/dev/golang/src/github.com/golang/dep/internal/gps/solver.go:537 +0x1f7
github.com/golang/dep/internal/gps.(*solver).check(0xc42019a000, 0xc420197a40, 0x2b, 0x0, 0x0, 0x167f520, 0xc42045f5a0, 0xc420383f80, 0x3, 0x4, ...)
        /Users/sas1024/dev/golang/src/github.com/golang/dep/internal/gps/satisfy.go:43 +0x1f0
github.com/golang/dep/internal/gps.(*solver).findValidVersion(0xc42019a000, 0xc4203766e0, 0xc420383f80, 0x3, 0x4, 0x0, 0xc420383f80)
        /Users/sas1024/dev/golang/src/github.com/golang/dep/internal/gps/solver.go:807 +0x2d5
github.com/golang/dep/internal/gps.(*solver).createVersionQueue(0xc42019a000, 0xc420197a40, 0x2b, 0x0, 0x0, 0xc420383f80, 0x3, 0x4, 0x0, 0x0, ...)
        /Users/sas1024/dev/golang/src/github.com/golang/dep/internal/gps/solver.go:780 +0xafc
github.com/golang/dep/internal/gps.(*solver).solve(0xc42019a000, 0x0, 0x0, 0x32)
        /Users/sas1024/dev/golang/src/github.com/golang/dep/internal/gps/solver.go:397 +0x471
github.com/golang/dep/internal/gps.(*solver).Solve(0xc42019a000, 0x47, 0x167b220, 0x16c8dc8, 0xc4200180c2)
        /Users/sas1024/dev/golang/src/github.com/golang/dep/internal/gps/solver.go:348 +0xab
main.(*ensureCommand).Run(0xc420137560, 0xc420133780, 0xc420010260, 0x1, 0x1, 0x0, 0x0)
        /Users/sas1024/dev/golang/src/github.com/golang/dep/cmd/dep/ensure.go:148 +0x3c8
main.(*Config).Run(0xc42006cf00, 0xc42006cf00)
        /Users/sas1024/dev/golang/src/github.com/golang/dep/cmd/dep/main.go:159 +0x8b3
main.main()
        /Users/sas1024/dev/golang/src/github.com/golang/dep/cmd/dep/main.go:44 +0x253

[sdboyer]

Thanks for the report! This is gonna be the same underlying problem as #351.

[sdboyer]

underlying issue has been band-aid-ed