CPU: Ryzen Threadripper 1920X Ubuntu 16.04 LTS Identical problems to the above. Agonizing, irritating, random, low-load idle-state freezes. No issues while under heavy load.
My fixes: Disabled c-states in the BIOS Disabled ASLR in the BIOS Disabled AMD Cool 'n Quiet in the BIOS. Compiled a new kernel from source, (4.13.16) but with "Offload RCU_callback processing" aka CONFIG_RCU_NOCB_CPU, chosen in the kernel config. I added "rcu_nocbs=0-23" to the "GRUB_CMDLINE_LINUX" parameter in /etc/default/grub (and then ran "sudo update-grub"). "0-23", to cover all 24 threads on the 12 core Ryzen, Rebooted. Only with all of those fixes (yep, all of them, tested every one of them separately -- that took an eon -- have I finally gotten a stable system. Zero issues now after 8 weeks. Let's hope that holds. Haven't tried any kernel updates, though. In addition to the above, I also consulted these references: http://blog.programster.org/stabilizing-ubuntu-16-04-on-ryzen http://blog.programster.org/ubuntu-16-04-compile-custom-kernel-for-ryzen http://blog.programster.org/how-to-disable-aslr -- 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
