golang/go

cmd/compile: internal compiler error: newname nil

dvyukov opened this issue · 7 comments

dvyukov commented

gc crashes on the following program:

package a
import""
var?
go.go:3: internal compiler error: newname nil

go version devel +ef37184 Mon Jul 6 00:07:10 2015 +0000 linux/amd64

andrewchambers commented

@dvyukov Can I ask how you are finding these bugs? Go Fuzz/random program generation? Are you hand reducing the test cases too?

dvyukov commented

@andrewchambers Yes, go-fuzz. Here is the test:
https://github.com/dvyukov/go-fuzz/blob/master/examples/gotypes/main.go
You can add llgo to the party as well.
Unfortunately it is quite messy because of all of the existing bugs. But what you can do is to compare llgo only to go/types (and exclude gc and gccgo invocations). If/when you run go-fuzz use -workdir=examples/goast because that dir contains an excessive corpus of inputs.

dspezia commented

I cannot reproduce it with tip.

$ go version
go version devel +89a68e9 Sat Oct 3 16:37:18 2015 +0000 linux/amd64

$ go build fuz.go
can't load package:
fuz.go:2:7: invalid import path: ""
dvyukov commented

Maybe it is fixed? Can you reproduce on the specified revision?

dspezia commented

Actually, I cannot reproduce, even on the specified revision.

$ cat fuz.go
package a
import""
var?

$ go version
go version devel +ef37184 Mon Jul 6 00:07:10 2015 +0000 linux/amd64

$ go build fuz.go
can't load package:
fuz.go:2:7: invalid import path: ""
dspezia commented

Ok, I can produce the internal compiler error by invoking gc directly (go tool compile). It seems the error is caught by the go tool before gc is executed.

gopherbot commented

CL https://golang.org/cl/15268 mentions this issue.