Failed to deference *G (EOF)

[Karan Chaudhary]

Hi,

I'm trying to debug a production issue using coredump of Go program.

Go version: go1.11 linux/amd64

Delve: Build: $Id: 1990ba12450cab9425a2ae62e6ab988725023d5c $

Gdb version: 8.2

 

(dlv) goroutines
Command failed: error derefing *G EOF

But on local it seems to work fine with same config. 

Thank,

Karan

[Alessandro Arzilli]

See if https://github.com/derekparker/delve/pull/1354 solves the
problem. I imagine the problem is that the coredump was taken as the
list of goroutines changed (either that or it's incomplete, or for some
reason we can't read the core file correctly).

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[Karan Chaudhary]

Thanks for the clean fix alessandro .  

As a way to skip the problem I had done this.

diff --git a/pkg/proc/proc.go b/pkg/proc/proc.go
index 3e88943..14fab21 100644
--- a/pkg/proc/proc.go
+++ b/pkg/proc/proc.go
@@ -497,7 +497,9 @@ func GoroutinesInfo(dbp Process) ([]*G, error) {
                }
                g, err := gvar.parseG()
                if err != nil {
-                       return nil, err
+                       fmt.Println("bad g:", err)
+                       continue
+                       //return nil, err
                }
                if thg, allocated := threadg[g.ID]; allocated {
                        loc, err := thg.Thread.Location()