[Qemu-devel] [Bug 1770417] Re: Qemu can not parse long fqdns during drive-mirror

[ChristianEhrhardt]

As Daniel asked in [1] making this abug report against Qemu (upstream).

[1]: https://bugzilla.redhat.com/show_bug.cgi?id=1568939

** Bug watch added: Red Hat Bugzilla #1568939
   https://bugzilla.redhat.com/show_bug.cgi?id=1568939

** Also affects: qemu
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1770417

Title:
  Qemu can not parse long fqdns during drive-mirror

Status in QEMU:
  New
Status in qemu package in Ubuntu:
  Confirmed

Bug description:
  During migration of an openstack booted instance, I got the following
  error:

  Apr 12 10:55:22 cmp1 libvirtd[4133]: 2018-04-12 10:55:22.133+0000:
  4139: error : qemuMonitorJSONCheckError:392 : internal error: unable
  to execute QEMU command 'drive-mirror': error parsing address 'cmp0
  .sandriichenko-deploy-heat-virtual-mcp-pike-ovs-76.bud-mk.local:49153'

  A bit more info in libvirt bug
  https://bugzilla.redhat.com/show_bug.cgi?id=1568939

  To reproduce it with qemu only, I followed the guide at
  https://github.com/qemu/qemu/blob/master/docs/interop/live-block-
  operations.rst#id21. On dest and source compute nodes, I launched an
  instance:

  qemu-system-x86_64 -display none -nodefconfig -M q35 -nodefaults -m
  512 -blockdev node-name=node-
  TargetDisk,driver=qcow2,file.driver=file,file.node-
  name=file,file.filename=./test-instance-mirror.qcow2 -device virtio-
  blk,drive=node-TargetDisk,id=virtio0 -S -monitor stdio -qmp unix
  :./qmp-sock,server,nowait -incoming tcp:localhost:6666

  Then on dest node I launched nbd server:

  (qemu) nbd_server_start cmp0:49153
  (qemu) nbd_server_add -w node-TargetDisk

  On the source node:

  (qemu) drive_mirror -n  node-TargetDisk 
nbd:cmp0.vdrok-deploy-heat-virtual-mcp-pike-ovs-foobarbuzz.bud-mk.local:49153:exportname=node-TargetDisk
  error parsing address 
'cmp0.vdrok-deploy-heat-virtual-mcp-pike-ovs-foobarbuzz.bud-mk.local:49153'

  When using short host name instead of FQDN address seems to be parsed
  fine:

  (qemu) drive_mirror -n  node-TargetDisk 
nbd:cmp0:49153:exportname=node-TargetDisk qcow2
  Image is not in qcow2 format

  (not sure why it is not a qcow2 format, as I have qcow2 image with raw
  backing file, but this is unrelated)

  QEMU version is 2.11.1 from bionic

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