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

[Richard Jones]

The logic in util/qemu-sockets.c is very complicated, containing workarounds
for all sorts of broken/obsolete GAI implementations, so it's hard to tell
what's going on there.

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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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