Invalid memory address or nil pointer dereference when running dep ensure

[sorcix]

What version of Go and dep are you using?

• go go1.9rc2 linux/amd64
• dep v0.3.0-132-g2097d86

What dep command did you run?

dep ensure

What did you expect to see?

No errors

What did you see instead?

dep ensure
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x38 pc=0x75a336]

goroutine 75 [running]:
github.com/golang/dep/internal/gps.stripVendor(0xc42019aff0, 0x46, 0x0, 0x0, 0xb06fa0, 0xc4203502d0, 0xc420619d58, 0xc420294001)
	/go/src/github.com/golang/dep/internal/gps/strip_vendor.go:12 +0x26
path/filepath.Walk(0xc42019aff0, 0x46, 0x8f5a48, 0x13, 0xc420619d78)
	/usr/local/go/src/path/filepath/path.go:401 +0x76
github.com/golang/dep/internal/gps.WriteDepTree.func1(0xc420168460, 0x18, 0xc42031abe0, 0xb0f480, 0xc42005b860, 0xc42024a120, 0x446501, 0xc4204b8160, 0xc4201ccb40, 0x2d, ...)
	/go/src/github.com/golang/dep/internal/gps/result.go:82 +0x44b
created by github.com/golang/dep/internal/gps.WriteDepTree
	/go/src/github.com/golang/dep/internal/gps/result.go:73 +0x242

My Gopkg.toml:

[[constraint]]                                                                                                                                                                                                                              
  name = "my-private-gitlab.com/group/project"
  branch = "master"
  source = "ssh://[email protected]/group/project.git"

[[constraint]]
  name = "github.com/urfave/cli"

[sdboyer]

hi, thanks for the bug report, and sorry about that 😢

@ibrasho i'm gonna guess this is is a product of parallelizing writes

[ibrasho]

@sdboyer I think I fixed this in #1020 (check this).

If the initial os.Lstat fail, the os.FileInfo param will be nil. I'm not sure why this started happening when parallelizing WriteDepTree but not when it was sequential?

[ashishtiwari1993]

@sdboyer facing same issue. Check here https://stackoverflow.com/questions/48424609/lastinsertid-go-redis-library-gives-error . You guess right above it with parallelism, In which i am continuously inserting data in forever loop with 10 goroutines . Is there any solution ? I have latest go and mysql driver.