I didn't see any guests crashing, instead they all just hang finding
nothing to boot.

I reduced this to just qemu (for debugging later on) but it reliably
breaks finding nothing from PXE.

Guest Console:
  iPXE (PCI 00:03.0) starting execution...ok
  iPXE initialising devices...ok
  iPXE 1.0.0+git-20180124.fbe8c52d-0ubuntu2.1 -- Open Source Network Boot 
Firmware
   -- http://ipxe.org
  Features: DNS HTTP HTTPS iSCSI NFS TFTP AoE ELF MBOOT PXE bzImage Menu PXEXT

  net0: 52:54:00:3b:72:0a using virtio-net on 0000:00:03.0 (open)
    [Link:up, TX:0 TXE:0 RX:0 RXE:0]
  Configuring (net0 52:54:00:3b:72:0a).................. No configuration 
methods
  succeeded (http://ipxe.org/040ee119)
  No more network devices

Corresponding command to start qemu:
#!/bin/bash
/usr/bin/qemu-system-x86_64 -name guest=horsea-kvm-pod-2047,debug-threads=on 
-machine pc-i440fx-bionic,accel=kvm,usb=off,dump-guest-core=off -m 2047 
-realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -cpu kvm64 -rtc base=utc 
-no-shutdown -curses \
-chardev 
socket,id=charmonitor,path=/tmp/horsea-kvm-pod-2047.monitor.sock,server,nowait \
-mon chardev=charmonitor,id=monitor,mode=control \
-chardev stdio,mux=on,id=charserial0,logfile=/tmp/horsea-kvm-pod-2047.log \
-device isa-serial,chardev=charserial0,id=serial0 \
-drive 
file=/var/lib/uvtool/libvirt/images/d9658e2f-d4c7-4a55-8ecc-b216612fe410,format=raw,if=none,id=drive-virtio-disk0
 \
-device 
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x6,drive=drive-virtio-disk0,id=virtio-disk0,serial=d9658e2f-d4c7-4a55-8ecc-b216612fe410
 \
 \
-boot order=n,strict=on \
 \
-net bridge,br=virbr1,helper=/usr/lib/qemu/qemu-bridge-helper -net 
nic,model=virtio,macaddr=52:54:00:3b:72:0a


This is the mac that is also in the libvirt XML.
The bridge is the one served by MAAS and it seems there is just no PXE 
responding to it.

Since the two other guests as started by maas+libvirt hang just the same way it 
most likely is a general MAAS setup issue.
Please help me to get MAAS to reply the way you would usually expect it, to 
then be able to go on with debugging.

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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1797581

Title:
  Composing a VM in MAAS with exactly 2048 MB RAM causes the VM to
  kernel panic

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