Public bug reported:

Since upgrading to 20.04 from 19.10 I can reliably hang my system by
loading Google Maps in Chrome and zooming in and out.

After turning on DRM debugging:

echo 0x1ff | sudo tee /sys/module/drm/parameters/debug

I can see the following message in the kernel log:

[16333.092468] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx_0.0.0 
timeout, signaled seq=2542114, emitted seq=2542116
[16333.092537] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process information: 
process  pid 0 thread  pid 0
[16333.092540] [drm] GPU recovery disabled.

It seems to be this upstream bug:
https://gitlab.freedesktop.org/drm/amd/issues/892

I have two workarounds:

* Running Chrome with AMD_DEBUG=nongg fixes the issue on 5.4.0-26
* With the latest upstream kernel, 5.6.7-050607, Chrome can load google maps 
with no issues.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-26-generic 5.4.0-26.30
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  nicholas   5696 F.... pulseaudio
 /dev/snd/controlC0:  nicholas   5696 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Apr 27 18:36:12 2020
InstallationDate: Installed on 2019-11-04 (174 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/BOOT/ubuntu_e02uh9@/vmlinuz-5.4.0-26-generic 
root=ZFS=rpool/ROOT/ubuntu_e02uh9 ro quiet splash vt.handoff=1
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-26-generic N/A
 linux-backports-modules-5.4.0-26-generic  N/A
 linux-firmware                            1.187
RfKill:
 0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to focal on 2020-04-26 (0 days ago)
dmi.bios.date: 07/12/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.30
dmi.board.name: X570 Phantom Gaming 4
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP1.30:bd07/12/2019:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnX570PhantomGaming4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: To Be Filled By O.E.M.
dmi.product.sku: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.

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


** Tags: amd64 apport-bug focal third-party-packages

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https://bugs.launchpad.net/bugs/1875459

Title:
  System hangs when loading google maps on chrome with navi AMD GPU

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