[Bug 1807348] [NEW] kernel BUG at arch/x86/mm/pat.c when authorising thunderbolt eGPU

Public bug reported:

Every time I authorise my thunderbolt 3 eGPU, and every subsequent boot
after authorising it the machine (well, at least Gnome/X/Wayland)
immediately hangs. This happened with a 18.04/bionic install too, as
well as with a 18.10/cosmic live-USB boot.


[drm] radeon kernel modesetting enabled.
radeon 0000:09:00.0: enabling device (0006 -> 0007)
[drm] initializing kernel modesetting (TAHITI 0x1002:0x679A 0x174B:0xE210 0x00).
ATOM BIOS: TAHITI
[drm] GPU not posted. posting now...
[drm] Changing default dispclk from 500Mhz to 600Mhz
radeon 0000:09:00.0: VRAM: 3072M 0x0000000000000000 - 0x00000000BFFFFFFF (3072M used)
radeon 0000:09:00.0: GTT: 2048M 0x00000000C0000000 - 0x000000013FFFFFFF
------------[ cut here ]------------
kernel BUG at arch/x86/mm/pat.c:549!
invalid opcode: 0000 [#1] SMP PTI
CPU: 1 PID: 2587 Comm: systemd-udevd Not tainted 4.18.0-11-generic #12-Ubuntu
Hardware name: /NUC6i7KYB, BIOS KYSKLi70.86A.0058.2018.0911.1509 09/11/2018
RIP: 0010:reserve_memtype+0x178/0x290

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: linux-image-4.18.0-12-generic 4.18.0-12.13
ProcVersionSignature: Ubuntu 4.18.0-12.13-generic 4.18.17
Uname: Linux 4.18.0-12-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: nick 1616 F.... pulseaudio
/dev/snd/controlC1: nick 1616 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Fri Dec 7 21:25:56 2018
InstallationDate: Installed on 2018-11-23 (13 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-12-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash intel_iommu=on vt.handoff=1
RelatedPackageVersions:
linux-restricted-modules-4.18.0-12-generic N/A
linux-backports-modules-4.18.0-12-generic N/A
linux-firmware 1.175.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/11/2018
dmi.bios.vendor: Intel Corp.
dmi.bios.version: KYSKLi70.86A.0058.2018.0911.1509
dmi.board.name: NUC6i7KYB
dmi.board.vendor: Intel Corporation
dmi.board.version: H90766-405
dmi.chassis.type: 3
dmi.chassis.vendor: Intel Corporation
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnIntelCorp.:bvrKYSKLi70.86A.0058.2018.0911.1509:bd09/11/2018:svn:pn:pvr:rvnIntelCorporation:rnNUC6i7KYB:rvrH90766-405:cvnIntelCorporation:ct3:cvr1.0:

** Affects: linux (Ubuntu)
Importance: Undecided
Status: New


** Tags: amd64 apport-bug cosmic wayland-session

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https://bugs.launchpad.net/bugs/1807348

Title:
kernel BUG at arch/x86/mm/pat.c when authorising thunderbolt eGPU

Status in linux package in Ubuntu:
New

Bug description:
Every time I authorise my thunderbolt 3 eGPU, and every subsequent
boot after authorising it the machine (well, at least Gnome/X/Wayland)
immediately hangs. This happened with a 18.04/bionic install too, as
well as with a 18.10/cosmic live-USB boot.


[drm] radeon kernel modesetting enabled.
radeon 0000:09:00.0: enabling device (0006 -> 0007)
[drm] initializing kernel modesetting (TAHITI 0x1002:0x679A 0x174B:0xE210 0x00).
ATOM BIOS: TAHITI
[drm] GPU not posted. posting now...
[drm] Changing default dispclk from 500Mhz to 600Mhz
radeon 0000:09:00.0: VRAM: 3072M 0x0000000000000000 - 0x00000000BFFFFFFF (3072M used)
radeon 0000:09:00.0: GTT: 2048M 0x00000000C0000000 - 0x000000013FFFFFFF
------------[ cut here ]------------
kernel BUG at arch/x86/mm/pat.c:549!
invalid opcode: 0000 [#1] SMP PTI
CPU: 1 PID: 2587 Comm: systemd-udevd Not tainted 4.18.0-11-generic #12-Ubuntu
Hardware name: /NUC6i7KYB, BIOS KYSKLi70.86A.0058.2018.0911.1509 09/11/2018
RIP: 0010:reserve_memtype+0x178/0x290

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: linux-image-4.18.0-12-generic 4.18.0-12.13
ProcVersionSignature: Ubuntu 4.18.0-12.13-generic 4.18.17
Uname: Linux 4.18.0-12-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: nick 1616 F.... pulseaudio
/dev/snd/controlC1: nick 1616 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Fri Dec 7 21:25:56 2018
InstallationDate: Installed on 2018-11-23 (13 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-12-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash intel_iommu=on vt.handoff=1
RelatedPackageVersions:
linux-restricted-modules-4.18.0-12-generic N/A
linux-backports-modules-4.18.0-12-generic N/A
linux-firmware 1.175.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/11/2018
dmi.bios.vendor: Intel Corp.
dmi.bios.version: KYSKLi70.86A.0058.2018.0911.1509
dmi.board.name: NUC6i7KYB
dmi.board.vendor: Intel Corporation
dmi.board.version: H90766-405
dmi.chassis.type: 3
dmi.chassis.vendor: Intel Corporation
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnIntelCorp.:bvrKYSKLi70.86A.0058.2018.0911.1509:bd09/11/2018:svn:pn:pvr:rvnIntelCorporation:rnNUC6i7KYB:rvrH90766-405:cvnIntelCorporation:ct3:cvr1.0:

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