cgo problem? ([Could not launch program: decoding dwarf section info at offset 0x0: too short])

[quarnster]

11:59 ~/code/go $ cat hello.go
package main

// #include <stdio.h>
// #include <stdlib.h>
// static void hack(char *str) { printf("%s", str); }
import "C"

import "unsafe"

func main() {
        cstr := C.CString("hello world!\n")
        defer C.free(unsafe.Pointer(cstr))
        C.hack(cstr)
}
11:59 ~/code/go $ go build hello.go
11:59 ~/code/go $ dlv ./hello
[Could not launch program: decoding dwarf section info at offset 0x0: too short]
11:59 ~/code/go $
dlv
Delve version 0.5.0.beta

flags:
  -v - Print version

Invoke with the path to a binary:

  dlv ./path/to/prog

or use the following commands:
  run - Build, run, and attach to program
  attach - Attach to running process

12:00 ~/code/go $ dlv -v -
flag provided but not defined: -v
Usage of dlv:
12:00 ~/code/go $ go version
go version go1.4 darwin/amd64
12:00 ~/code/go $ uname -a
Darwin Thunder 14.1.0 Darwin Kernel Version 14.1.0: Mon Dec 22 23:10:38 PST 2014; root:xnu-2782.10.72~2/RELEASE_X86_64 x86_64
12:01 ~/code/go $

[quarnster]

Appears to be related to Go#8973, building with go build -ldflags="-linkmode=internal" appears to work just fine.

Feel free to close this issue if you see nothing you'd like to fix here.

[derekparker]

Thanks, this surfaced another issue of the -v flag not working, fixed now.

I'll keep this issue open because I can probably get a fix in to Delve to handle this until 1.5 lands.

Also, it's preferred to use dlv run over building yourself, simply because run compiles the program to be a bit more debugger friendly.

[ahl]

I just hit this on c3ade94 (
could not attach to pid 39933: decoding dwarf section info at offset 0x0: too short

Even more concerning is that dlv killed the process I was trying to debug.

[aarzilli]

@ahl do you have steps we can follow to reproduce this or a binary to examine?

[ahl]

package main

import "fmt"

func main() {
    for {
        fmt.Println("all work and no play makes jack a dull boy")
    }
}

go run test.go and dlv attach $(pgrep test) on darwin:

could not attach to pid 68703: decoding dwarf section info at offset 0x0: too short

Perhaps you're not supposed to use dlv with go run? Irrespective "do no harm" is job one for a debugger and my process should not end up dead in any circumstance.

This also happens on a non-golang binary. Again, the debugger should never kill target process.

[gabriel]

This also happens if you use -ldflags -s to get macOS codesigning to work golang/go#11887

[xsank]

i use the idea to debug grafana project on windows,but meet the same problem.
could not launch process: decoding dwarf section info at offset 0x0: too short
after i solved this, and success use the dlv debugging, another trouble comes...

it always suspend in here from github.com/go-stack/stack/stack.go
here is my usage:

C:\Users\.IntelliJIdea15\config\plugins\Go\lib\dlv\windows\dlv.exe --listen=localhost:51358 --headless=true exec "C:\Program Files (x86)\JetBrains\IntelliJ IDEA 15.0.2\jre\jre\bin\bin\Build main.exe" --
GOROOT=C:/Go
GOPATH=D:/code/mine/go
C:/Go\bin\go.exe build -ldflags -linkmode=internal -o "C:\Program Files (x86)\JetBrains\IntelliJ IDEA 15.0.2\jre\jre\bin\bin\Build main.exe" -gcflags "-N -l" github.com/grafana/grafana/pkg/cmd/grafana-server
API server listening at: 127.0.0.1:51358  

without any warnings. but it just hang there and cannot move on.
IDEA:15.0.2
Go:1.7.3
OS:widnows 7

[aarzilli]

@xsank: this should be fixed by f6e8fb3 (see #594), update your dlv.

[xsank]

@aarzilli ,is there any windows release dlv i can use or i have to build it myself?

[xsank]

thank you for your help! @aarzilli

[aarzilli]

@sank: you have to build it yourself.

[aambati]

I am seeing this error in Visual Studio code Version 1.12.2 (1.12.2) on Mac:

2017/05/17 13:41:33 server.go:73: Using API v1
2017/05/17 13:41:33 debugger.go:97: launching process with args: [./debug.test]
could not launch process: decoding dwarf section info at offset 0x0: too short
Process exiting with code: 1

GOPATH env variable is set and dlv is installed in $GOPATH/bin directory

launch.json looks like this:

{
   "version": "0.2.0",
   "configurations": [
      {
         "name": "go test",
         "type": "go",
         "request": "launch",
         "mode": "test",
         "remotePath": "",
         "port": 5000,
         "host": "127.0.0.1",
         "program": "<set to directory that contains go test files>",
         "env": {},
         "args": [],
         "showLog": true
      }
   ]
}

I have tried adding GOPATH variable to "env" configuration property in launch.json but got the same error. I am using delve version 1.0.0-rc.1

[aarzilli]

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