1. appears to depend on snapshot, given cloud images handle the LUNs fine as 
additional disks
2. debug symbols part may need more effort than I can spend on this

Also appears to require the following PEBCAK configuration snippet, but
that alone was not enough to reproduce the crash with stock cloud
images:

--- vmdef_crashes.xml
+++ vmdef_works_ok.xml
@@ -67,7 +67,7 @@
     <controller type='scsi' index='0' model='virtio-scsi'>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x07' 
function='0x0'/>
     </controller>
-    <controller type='scsi' index='1'>
+    <controller type='scsi' index='1' model='virtio-scsi'>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x08' 
function='0x0'/>
     </controller>
     <interface type='network'>

Apparently some cleanup had already removed the earlier /var/crash
contents after May 23rd but since I can both reproduce and workaround
this, might attempt reproducing this once I have debugging symbols set
up. Whether OVMF is a requirement is unknown for now, but the crashing
snapshot does use UEFI.

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https://bugs.launchpad.net/bugs/1773004

Title:
  qemu-system-x86_64 segfaults during guest kernel boot

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