When I exit the above pictured initram prompt I get a full crash.
** Attachment added: "upstream kernel iommu segfault"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1747463/+attachment/5051784/+files/IMG_20180209_115216.jpg
** Tags added: kernel-bug-exists-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1747463
Title:
kernel crashes during boot 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.
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
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 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
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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