I think I experience the same problem as described here with my recently
built Ryzen computer. After installing a fresh Linux distribution I
started out with Linux kernel 4.19.45. The computer ran for two days
continuously, after a short pause I came back and saw it completely
froze. Screen showed the last visible image, but no input worked.
Neither ping/ssh, neither mouse or keyboard worked. Not even the num
lock LED. There were no log entries written, neither on screen or
harddisk. Last entry was some cron job, cleaning up temporary
directories. The workload was just a vim, a VNC viewer and a Firefox.
The next night, the same freeze happened. That finally got my attention
to dig deeper.

As first measure I updated the Kernel to 5.1.4. After 2 hours running,
without much load, it also froze.

I dug deeper, and as first measure I set the BIOS from "Auto" to "Typical 
current Idle". Uptime is now 1 day, without any workload except a chat client.
This is 

This is my System:

# CPU:
    cpu family  : 23
    model               : 1
    model name  : AMD Ryzen 5 1600 Six-Core Processor
    stepping    : 1
    microcode   : 0x8001137
    cpu MHz             : 1646.140

# Mainboard:
    Gigabyte Technology Co., Ltd. B450 AORUS ELITE/B450 AORUS ELITE, BIOS F5 
01/25/2019

# GPU:
    NVIDIA GP107 [GeForce GTX 1050 Ti]
    Driver/OpenGL: 4.6.0 NVIDIA 418.74

# OS:
    Distro: Manjaro
    Kernel: 5.1.4-1-MANJARO x86_64

I also see this in my bootup log:
12 times: [Firmware Bug]: ACPI MWAIT C-state 0x0 not supported by HW (0x0)
12 times: microcode: CPU0: patch_level=0x0800113


Like said, my computer is running now for 1 day without any load with the BIOS 
option "Typical current Idle" set. This is so far the same "workaround" that
brodyck wrote at 2019-04-01 15:40:26 UTC. Unfortunately, or fortunately for 
him, he has not wrote anything since then. That might mean, that the problems 
stopped for him at that point.
I will further observe this issue with my new workstation. If you don't hear 
back from me, the BIOS setting very likely worked.

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https://bugs.launchpad.net/bugs/1690085

Title:
  Ryzen 1800X freeze - rcu_sched detected stalls on CPUs/tasks

Status in Linux:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Hi,

  
  We aregetting various kernel crash on a pretty new config.
  We're using Ryzen 1800X CPU with X370 Gaming Pro Carbon MB (7A32V1) using 
latest BIOS available (1.52)

  We are running Ubuntu 17.04 (amd64), we've tried different kernel version, 
native one and releases from http://kernel.ubuntu.com/~kernel-ppa/mainline/ too.
  Tested kernel version:

  native 17.04 kernel
  4.10.15

  Issues are the same, we're getting random freeze on the machine.

  Here is kern.log entry when happening :

  May 10 22:41:56 dev2 kernel: [24366.186246] INFO: rcu_sched detected stalls 
on CPUs/tasks:
  May 10 22:41:56 dev2 kernel: [24366.187618]     0-...: (1 GPs behind) 
idle=49b/1/0 softirq=28561/28563 fqs=913449
  May 10 22:41:56 dev2 kernel: [24366.188977]     (detected by 12, t=1860207 
jiffies, g=10001, c=10000, q=4656)
  May 10 22:41:56 dev2 kernel: [24366.190344] Task dump for CPU 0:
  May 10 22:41:56 dev2 kernel: [24366.190345] swapper/0       R  running task   
     0     0      0 0x00000008
  May 10 22:41:56 dev2 kernel: [24366.190348] Call Trace:
  May 10 22:41:56 dev2 kernel: [24366.190354]  ? native_safe_halt+0x6/0x10
  May 10 22:41:56 dev2 kernel: [24366.190355]  ? default_idle+0x20/0xd0
  May 10 22:41:56 dev2 kernel: [24366.190358]  ? arch_cpu_idle+0xf/0x20
  May 10 22:41:56 dev2 kernel: [24366.190360]  ? default_idle_call+0x23/0x30
  May 10 22:41:56 dev2 kernel: [24366.190362]  ? do_idle+0x16f/0x200
  May 10 22:41:56 dev2 kernel: [24366.190364]  ? cpu_startup_entry+0x71/0x80
  May 10 22:41:56 dev2 kernel: [24366.190366]  ? rest_init+0x77/0x80
  May 10 22:41:56 dev2 kernel: [24366.190368]  ? start_kernel+0x464/0x485
  May 10 22:41:56 dev2 kernel: [24366.190369]  ? 
early_idt_handler_array+0x120/0x120
  May 10 22:41:56 dev2 kernel: [24366.190371]  ? 
x86_64_start_reservations+0x24/0x26
  May 10 22:41:56 dev2 kernel: [24366.190372]  ? x86_64_start_kernel+0x14d/0x170
  May 10 22:41:56 dev2 kernel: [24366.190373]  ? start_cpu+0x14/0x14
  May 10 22:44:56 dev2 kernel: [24546.188093] INFO: rcu_sched detected stalls 
on CPUs/tasks:
  May 10 22:44:56 dev2 kernel: [24546.189461]     0-...: (1 GPs behind) 
idle=49b/1/0 softirq=28561/28563 fqs=935027
  May 10 22:44:56 dev2 kernel: [24546.190823]     (detected by 14, t=1905212 
jiffies, g=10001, c=10000, q=4740)
  May 10 22:44:56 dev2 kernel: [24546.192191] Task dump for CPU 0:
  May 10 22:44:56 dev2 kernel: [24546.192192] swapper/0       R  running task   
     0     0      0 0x00000008
  May 10 22:44:56 dev2 kernel: [24546.192195] Call Trace:
  May 10 22:44:56 dev2 kernel: [24546.192199]  ? native_safe_halt+0x6/0x10
  May 10 22:44:56 dev2 kernel: [24546.192201]  ? default_idle+0x20/0xd0
  May 10 22:44:56 dev2 kernel: [24546.192203]  ? arch_cpu_idle+0xf/0x20
  May 10 22:44:56 dev2 kernel: [24546.192204]  ? default_idle_call+0x23/0x30
  May 10 22:44:56 dev2 kernel: [24546.192206]  ? do_idle+0x16f/0x200
  May 10 22:44:56 dev2 kernel: [24546.192208]  ? cpu_startup_entry+0x71/0x80
  May 10 22:44:56 dev2 kernel: [24546.192210]  ? rest_init+0x77/0x80
  May 10 22:44:56 dev2 kernel: [24546.192211]  ? start_kernel+0x464/0x485
  May 10 22:44:56 dev2 kernel: [24546.192213]  ? 
early_idt_handler_array+0x120/0x120
  May 10 22:44:56 dev2 kernel: [24546.192214]  ? 
x86_64_start_reservations+0x24/0x26
  May 10 22:44:56 dev2 kernel: [24546.192215]  ? x86_64_start_kernel+0x14d/0x170
  May 10 22:44:56 dev2 kernel: [24546.192217]  ? start_cpu+0x14/0x14

  Depending on the kernel version, we've got NMI watchdog errors related to CPU 
stuck (mentioning the CPU core id, which is random).
  Crash is happening randomly, but in general after some hours (3-4h).

  Now, we've installed kernel 4.11.0-041100-generic #201705041534 this morning 
and waiting for crash...
  For now, the machine is not "used", at least, it's not CPU stressed...

  
  Thanks
  --- 
  ApportVersion: 2.20.4-0ubuntu4
  Architecture: amd64
  DistroRelease: Ubuntu 17.04
  InstallationDate: Installed on 2017-05-09 (1 days ago)
  InstallationMedia: Ubuntu-Server 17.04 "Zesty Zapus" - Release amd64 
(20170412)
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  Tags:  zesty
  Uname: Linux 4.11.0-041100-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True

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