Public bug reported:

System freezes. Sometimes I can move the mouse, sometimes not.
Dmesg contains soft lockups, hard lockups and MCEs.
Hardware:
CPU: Ryzen 7 1800X
RAM: Crucial Ballistix 32 GiB DDR4
Motherboard: ASUS Crosshair VI Hero
PSU: Corsair TX750v2

I have also tested with a Corsair TX750M and a Gigabyte Aorus Ultra
Gaming. I've also used a different memory kit, Corsair LPX Vengeance.
Still had issues.

I have had the processor replaced by AMD two times. The first time because it 
segfaulted while executing this script: 
https://github.com/suaefar/ryzen-test/blob/master/kill-ryzen.sh
And the second time because the processor thrown MCEs while executing that same 
script.

Now I'm left with MCEs collected at boot or with soft and hard lockups
collected by the kernel with the NMI watchdog timer.

Having the extension GNOME Vitals polling hardware sensors with asus-
wmi-sensors makes the freezes more frequent.

This bug opened in mainline kernel's bugzilla 
https://bugzilla.kernel.org/show_bug.cgi?id=208201 provides a C program which 
can trigger errors too (unknown NMIs and PCIe AER). There are two versions:
* V1 https://bugzilla.kernel.org/attachment.cgi?id=292941
* V2 https://bugzilla.kernel.org/attachment.cgi?id=292949

[41717.839567] Uhhuh. NMI received for unknown reason 2d on CPU 11.
[41717.839568] Do you have a strange power saving mode enabled?
[41717.839568] Dazed and confused, but trying to continue

and

pcieport 0000:00:01.3: AER: Corrected error received: 0000:00:00.0
pcieport 0000:00:01.3: AER: PCIe Bus Error: severity=Corrected, type=Data Link 
Layer, (Transmitter ID)
pcieport 0000:00:01.3: AER:   device [1022:1453] error 
status/mask=00001000/00006000
pcieport 0000:00:01.3: AER:    [12] Timeout 

This PCIe error comes from the bus providing USB ports. The Crosshair VI
Hero motherboard has shown dead USB ports at boot sometimes, leaving the
system without keyboard and mouse and Ubuntu booting slowly.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-generic 5.4.0.51.54
ProcVersionSignature: Ubuntu 5.4.0-51.56-generic 5.4.65
Uname: Linux 5.4.0-51-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  raul       2671 F.... pulseaudio
 /dev/snd/controlC0:  raul       2671 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 19 10:28:31 2020
HibernationDevice:
 
InstallationDate: Installed on 2014-06-05 (2327 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: System manufacturer System Product Name
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-51-generic 
root=UUID=c46a90a3-0e37-4fb0-87ea-a14d4713dfc4 ro iommu=pt 
crashkernel=512M-:192M
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-51-generic N/A
 linux-backports-modules-5.4.0-51-generic  N/A
 linux-firmware                            1.187.3
RfKill:
 
SourcePackage: linux
UpgradeStatus: Upgraded to focal on 2020-04-26 (175 days ago)
dmi.bios.date: 07/31/2020
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 7901
dmi.board.asset.tag: Default string
dmi.board.name: CROSSHAIR VI HERO
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr7901:bd07/31/2020:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnCROSSHAIRVIHERO:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

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


** Tags: amd64 apport-bug focal

** Attachment added: "single-load-loop.c"
   
https://bugs.launchpad.net/bugs/1900401/+attachment/5424082/+files/single-load-loop.c

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Title:
  Ryzen 1800X soft lockups

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