this is the result of booting with the upstream kernel with IOMMU turned
on in the bios

** Attachment added: "upstream kernel with iommu"

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  kernel crashes during boot unless IOMMU is disabled on Ryzen 1800X

Status in linux package in Ubuntu:

Bug description:
  I'm on a Ryzen 1800X and Biostar B350GT5 on bionic kubuntu.

  There are lots of AMD-Vi logged events and I get irq crashes or acpi
  hangups with a 'normal' boot. I got it to boot by disabling IOMMU in
  the BIOS and adding "iommu=soft" to the kernel booting options in

  linux can then detect everything properly (all cores) and I've had
  zero crashes. The only issue is that it's using software IOMMU which
  could have a performance penalty because it has to copy all the data
  of some PCI devices to sub 4G regions.

  Alternatively it boots with the kernel option "acpi=off" but only
  detects a single core/thread.

  I attached a kernel log.

  I believe(d) this might be related to
  ApportVersion: 2.20.8-0ubuntu8
  Architecture: amd64
   /dev/snd/controlC1:  fixme      1487 F.... pulseaudio
   /dev/snd/controlC0:  fixme      1487 F.... pulseaudio
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=bc971fcc-8e63-4fa5-a149-af4af6c8eece
  InstallationDate: Installed on 2018-01-31 (4 days ago)
  InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180131)
   lo        no wireless extensions.

   enp3s0    no wireless extensions.
  MachineType: BIOSTAR Group B350GT5
  Package: linux (not installed)
  ProcFB: 0 amdgpudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-32-generic.efi.signed 
root=/dev/mapper/kubuntu--vg-root ro iommu=soft quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
   linux-restricted-modules-4.13.0-32-generic N/A
   linux-backports-modules-4.13.0-32-generic  N/A
   linux-firmware                             1.170

  Tags:  bionic
  Uname: Linux 4.13.0-32-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True 11/30/2017
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 5.13
  dmi.board.asset.tag: None B350GT5
  dmi.board.vendor: BIOSTAR Group
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
dmi:bvnAmericanMegatrendsInc.:bvr5.13:bd11/30/2017:svnBIOSTARGroup:pnB350GT5:pvr:rvnBIOSTARGroup:rnB350GT5:rvr:cvnDefaultstring:ct3:cvrDefaultstring: None B350GT5
  dmi.sys.vendor: BIOSTAR Group

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