Since I set up remote console logging and upgraded my BIOS (again), I have not seen the hang anymore. Although I like this, I still have no more clues about the initial trace/problem.
FYI I am running on a Manufacturer: ASUSTeK COMPUTER INC. Product Name: PRIME B450-PLUS Version: 1820 Release Date: 09/12/2019 model name : AMD Ryzen 5 1600 Six-Core Processor -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1690085 Title: Ryzen 1800X freeze - rcu_sched detected stalls on CPUs/tasks To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1690085/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs