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

From: ChristianEhrhardt
Subject: [Qemu-devel] [Bug 1770417] Re: Qemu can not parse long fqdns during drive-mirror
Date: Fri, 11 May 2018 08:49:58 -0000

Ubuntu task is not actionable until we settled on how to change the
parsing code for long strings upstream, so I set it to confirmed but
wishlist (until we know what size a patch - or actions a recommendation
on handling differently has).

** Changed in: qemu (Ubuntu)
       Status: New => Confirmed

** Changed in: qemu (Ubuntu)
   Importance: Undecided => Wishlist

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  Qemu can not parse long fqdns during drive-mirror

Status in QEMU:
Status in qemu package in Ubuntu:

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

  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

  A bit more info in libvirt bug

  To reproduce it with qemu only, I followed the guide at
  operations.rst#id21. On dest and source compute nodes, I launched an

  qemu-system-x86_64 -display none -nodefconfig -M q35 -nodefaults -m
  512 -blockdev node-name=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 
  error parsing address 

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

  (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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