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[ChristianEhrhardt <1705132@xxxxxxxxxxxxxxxxxx>]

Referred change is upstream in Libvirt 3.2, so assuming that is fixed.
But check on X-Z SRUs

** Also affects: libvirt (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: libvirt (Ubuntu Zesty)
   Importance: Undecided
       Status: New

** Also affects: libvirt (Ubuntu Yakkety)
   Importance: Undecided
       Status: New

** Changed in: libvirt (Ubuntu)
       Status: New => Fix Released

** Changed in: libvirt (Ubuntu Xenial)
       Status: New => Triaged

** Changed in: libvirt (Ubuntu Yakkety)
       Status: New => Triaged

** Changed in: libvirt (Ubuntu Zesty)
       Status: New => Triaged

** Changed in: libvirt (Ubuntu Xenial)
       Status: Triaged => Incomplete

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https://bugs.launchpad.net/bugs/1705132

Title:
  Large memory guests, "error: monitor socket did not show up: No such
  file or directory"

Status in libvirt package in Ubuntu:
  Fix Released
Status in libvirt source package in Xenial:
  Incomplete
Status in libvirt source package in Yakkety:
  Triaged
Status in libvirt source package in Zesty:
  Triaged

Bug description:
  [Environment]

  Description:	Ubuntu 16.04.2 LTS
  Release:	16.04
  Codename:	xenial

  root@buneary:/home/ubuntu# dpkg -l | grep kvm
  ii  qemu-kvm                            1:2.5+dfsg-5ubuntu10.14                      amd64        QEMU Full virtualization

  [Description]

  - Configured a machine with 32 static VCPUs, 160GB of RAM using 1G 
  hugepages on a NUMA capable machine.

  Domain definition (http://pastebin.ubuntu.com/25121106/)

  - Once started (virsh start).

  Libvirt log.

  LC_ALL=C
  PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
  QEMU_AUDIO_DRV=none /usr/bin/kvm-spice -name reproducer2 -S -machine
  pc-i440fx-2.5,accel=kvm,usb=off -cpu host -m 124928 -realtime
  mlock=off -smp 32,sockets=16,cores=1,threads=2 -object memory-backend-
  file,id=ram-node0,prealloc=yes,mem-
  path=/dev/hugepages/libvirt/qemu,share=yes,size=64424509440,host-
  nodes=0,policy=bind -numa node,nodeid=0,cpus=0-15,memdev=ram-node0
  -object memory-backend-file,id=ram-node1,prealloc=yes,mem-
  path=/dev/hugepages/libvirt/qemu,share=yes,size=66571993088,host-
  nodes=1,policy=bind -numa node,nodeid=1,cpus=16-31,memdev=ram-node1
  -uuid d7a4af7f-7549-4b44-8ceb-4a6c951388d4 -no-user-config -nodefaults
  -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-
  reproducer2/monitor.sock,server,nowait -mon
  chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown
  -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2
  -drive
  file=/var/lib/uvtool/libvirt/images/test.qcow,format=qcow2,if=none,id
  =drive-virtio-disk0,cache=none -device virtio-blk-
  pci,scsi=off,bus=pci.0,addr=0x3,drive=drive-virtio-disk0,id=virtio-
  disk0,bootindex=1 -chardev pty,id=charserial0 -device isa-
  serial,chardev=charserial0,id=serial0 -vnc 127.0.0.1:0 -device cirrus-
  vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-
  pci,id=balloon0,bus=pci.0,addr=0x4 -msg timestamp=on

  Then the following error is raised.

  virsh start reproducer2
  error: Failed to start domain reproducer2
  error: monitor socket did not show up: No such file or directory

  
  [Possible Fix]

  https://libvirt.org/git/?p=libvirt.git;a=commitdiff;h=85af0b803cd19a03f71bd01ab4e045552410368f;hp=67dcb797ed7f1fbb048aa47006576f424923933b

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