You also said this only applies to the full 32bit stack for you (32bit host + 
guest) is that correct?
Had you the chance to try the same on 64bit host to know if this is a real 
constraint to see this issue? It would at least explain why I didn't see it as 
I had 32bit-Guest on 64-bit Host.

Never the less, this more and more seems to be a kernel bug if
a) you all can point it so clearly to these kernel versions
b) affecting qemu's from Trusty to Bionic

I'll directly ask one in the kernel Team to pop up on their radar.

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https://bugs.launchpad.net/bugs/1767857

Title:
  Kernel 4.4.0-122 Breaks qemu-system-x86

Status in linux package in Ubuntu:
  Confirmed
Status in qemu package in Ubuntu:
  Incomplete

Bug description:
  Fully updated xubuntu 16.04 running kernel 4.4.0-122 breaks qemu-
  system-x86: black screen displays and qemu-system-x86 runs at 100% cpu
  indefinitely. Boot the same system with kernel 4.4.0-119 and qemu-
  system-x86 works fine running a Windows 10 VM.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: qemu-system-x86 1:2.5+dfsg-5ubuntu10.25
  ProcVersionSignature: Ubuntu 4.4.0-122.146-generic 4.4.117
  Uname: Linux 4.4.0-122-generic i686
  ApportVersion: 2.20.1-0ubuntu2.16
  Architecture: i386
  CurrentDesktop: XFCE
  Date: Sun Apr 29 15:58:25 2018
  InstallationDate: Installed on 2014-04-29 (1460 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140416.2)
  KvmCmdLine:
   COMMAND         STAT  EUID  RUID   PID  PPID %CPU COMMAND
   kvm-irqfd-clean S<       0     0   394     2  0.0 [kvm-irqfd-clean]
  MachineType: Dell Inc. Inspiron 518
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-122-generic 
root=UUID=7cffb293-c044-4b2c-8343-dc50fd16db97 ro --verbose nosplash 
nmi_watchdog=0
  SourcePackage: qemu
  UpgradeStatus: Upgraded to xenial on 2016-08-10 (627 days ago)
  dmi.bios.date: 03/30/2009
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.0.8
  dmi.board.name: 0K068D
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 3
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: OEM
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.0.8:bd03/30/2009:svnDellInc.:pnInspiron518:pvr00:rvnDellInc.:rn0K068D:rvrA00:cvnDellInc.:ct3:cvrOEM:
  dmi.product.name: Inspiron 518
  dmi.product.version: 00
  dmi.sys.vendor: Dell Inc.

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