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net: panics on net.Listen("tcp", "") #3548

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remyoudompheng opened this issue Apr 18, 2012 · 7 comments

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@remyoudompheng
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commented Apr 18, 2012

What steps will reproduce the problem?
1. Run

package main

import (
      "fmt"
      "net"
)

func main() {
      _, err := net.Listen("tcp", "")
      fmt.Println(err)
}

What is the expected output? What do you see instead?

Expected:
missing port in address

Got:
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x38 pc=0x43750e]

goroutine 1 [running]:
net.favoriteAddrFamily(0x4d2624, 0x7f1c00000003, 0x0, 0x0, 0x0, ...)
    /build/src/release-build/src/pkg/net/ipsock_posix.go:100 +0xc3
net.internetSocket(0x4d2624, 0x7f1c00000003, 0x0, 0x0, 0x0, ...)
    /build/src/release-build/src/pkg/net/ipsock_posix.go:127 +0xd9
net.ListenTCP(0x4d2624, 0x7473696c00000003, 0x0, 0x70637400000003, 0x0, ...)
    /build/src/release-build/src/pkg/net/tcpsock_posix.go:302 +0xc2
net.Listen(0x4d2624, 0x70637400000003, 0x4d17e4, 0x0, 0x47fdf8, ...)
    /build/src/release-build/src/pkg/net/dial.go:188 +0x1e3
main.main()
    /tmp/test.go:9 +0x3d

goroutine 2 [syscall]:
created by runtime.main
    /build/src/release-build/src/pkg/runtime/proc.c:221
exit status 2
@davecheney

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commented Apr 20, 2012

Comment 1:

I starter to look into this last night. Unless someone else gets to this before me I'll
tackle it once issue #3507 is closed.
@remyoudompheng

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commented Apr 20, 2012

Comment 2:

I am told it should not give an error but listen on a wildcard address. I'm not sure
what is the expected behaviour
@davecheney

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commented Apr 20, 2012

Comment 3:

So net.Listen("tcp", "") is the equivalent of net.Listen("tcp", ":0"), so to speak ?
@ianlancetaylor

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commented Apr 23, 2012

Comment 4:

Labels changed: added priority-soon, removed priority-triage.

@mikioh

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commented Apr 24, 2012

Comment 5:

I'd prefer comment on favoriteAddrFamily, so this is a Wild-Wild listen.
@mikioh

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commented Apr 24, 2012

@mikioh

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commented Apr 25, 2012

Comment 7:

This issues was fixed by revision: b07591eb8077.

Status changed to Fixed.

@golang golang locked and limited conversation to collaborators Jun 24, 2016

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