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[Qemu-devel] [Bug 1814381] [NEW] qemu can't resolve ::1 when no network


From: Richard Jones
Subject: [Qemu-devel] [Bug 1814381] [NEW] qemu can't resolve ::1 when no network is available
Date: Sat, 02 Feb 2019 13:32:16 -0000

Public bug reported:

I'm not sure if this is a qemu thing or a getaddrinfo/glibc thing, or
even just something about my laptop.  However we have a test failure
in nbdkit which only occurs when my laptop is not connected to wifi or
other networking.  It boils down to:

  $ qemu-img info --image-opts "file.driver=nbd,file.host=::1,file.port=1234"
  qemu-img: Could not open 'file.driver=nbd,file.host=::1,file.port=1234': 
address resolution failed for ::1:1234: Address family for hostname not 
supported

In a successful case it should connect to a local NBD server on port
1234, but if you don't have that you will see:

  qemu-img: Could not open
'file.driver=nbd,file.host=::1,file.port=1234': Failed to connect
socket: Connection refused

I can ‘ping6 ::1’ fine.

It also works if I replace ‘::1’ with ‘localhost6’.

My /etc/hosts contains:

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

** Affects: qemu
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1814381

Title:
  qemu can't resolve ::1 when no network is available

Status in QEMU:
  New

Bug description:
  I'm not sure if this is a qemu thing or a getaddrinfo/glibc thing, or
  even just something about my laptop.  However we have a test failure
  in nbdkit which only occurs when my laptop is not connected to wifi or
  other networking.  It boils down to:

    $ qemu-img info --image-opts "file.driver=nbd,file.host=::1,file.port=1234"
    qemu-img: Could not open 'file.driver=nbd,file.host=::1,file.port=1234': 
address resolution failed for ::1:1234: Address family for hostname not 
supported

  In a successful case it should connect to a local NBD server on port
  1234, but if you don't have that you will see:

    qemu-img: Could not open
  'file.driver=nbd,file.host=::1,file.port=1234': Failed to connect
  socket: Connection refused

  I can ‘ping6 ::1’ fine.

  It also works if I replace ‘::1’ with ‘localhost6’.

  My /etc/hosts contains:

  127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
  ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

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