My system reboots randomly, mostly at idle. I have tried the
'powersupply idle' UEFI option, but it didn't work. I have changed
motherboard, RAM and PSU, but it still reboots/crashes, doesn't matter
if it's overclocked or not. The system is not reliable.

Currently an ASUS CROSSHAIR VI HERO, BIOS 7201 07/12/2019.
The previous motherboard was a Gigabyte Aorus Ultra Gaming X470 with BIOS F40.

Now I'm waiting for the next reboot (if it happens) after disabling C6
global states in UEFI (core C6 as per zenstates.py). The next step would
be to flash a new BIOS file containing AGESA 1.0.0.3ABB. Comment
https://bugzilla.kernel.org/show_bug.cgi?id=196683#c623 reports no more
stability problems with a BIOS providing that AGESA version.

Has anyone used the xHCI debug capability to at least know what happens just 
before the crash/reboot?
https://www.kernel.org/doc/html/latest/driver-api/usb/usb3-debug-port.html

AFAIK, the chipset should support DbC, as the file "dbc" is listed under
the xHCI device node in sysfs and echo "enable" to it.

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

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

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