apport information

** Attachment added: "Lsusb.txt"
   https://bugs.launchpad.net/bugs/1747463/+attachment/5049286/+files/Lsusb.txt

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Title:
  kernel crashes unless IOMMU is disabled on Ryzen 1800X

Status in linux package in Ubuntu:
  Confirmed

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

  Lots of AMD-Vi logged events and I get irq crashes or acpi hangups
  with a normal boot. How I it to work is to disable IOMMU in the BIOS
  and add "iommu=soft" to the kernel booting options in grub.

  linux can then detect everything properly (all cores) and I've had
  zero crashes. The only issue is that it's using software IOMMU.

  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 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1671360
  and https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1690085
  --- 
  ApportVersion: 2.20.8-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /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)
  IwConfig:
   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
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-32-generic N/A
   linux-backports-modules-4.13.0-32-generic  N/A
   linux-firmware                             1.170
  RfKill:
   
  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
  dmi.bios.date: 11/30/2017
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 5.13
  dmi.board.asset.tag: None
  dmi.board.name: 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.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr5.13:bd11/30/2017:svnBIOSTARGroup:pnB350GT5:pvr:rvnBIOSTARGroup:rnB350GT5:rvr:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.family: None
  dmi.product.name: B350GT5
  dmi.sys.vendor: BIOSTAR Group

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