by moshevds:

Trying to compile the following code snippet with 6g will reproduce the
segmentation fault:
type A struct {a A}
func foo() {new(A).bar()}
func (a A) bar() {}

Without the method call, 6g correctly reports the invalid recursive type.

As far as I can tell, exportassignok() (go/src/cmd/gc/typecheck.c) gets
caught up in an endless recursion.

The bug also surfaces when chaining 2 or more types together.

Some other information:
GOARCH=amd64
GOBIN=~/bin
GOOS=linux
GOROOT=~/go
I'm at changeset 4031:b2ccee5ff169