I had the same issues this bug describes: Freeze on low load; Runs fine on heavy load. I even ran stress -c 16 when I had to keep the system up for long periods of low load.
I tried pretty much everything in this list including compiling a mainline kernel with CONFIG_RCU_NOCB_CPU enabled and the respective GRUB changes without success. I noticed a problem in /var/log/syslog involving the ath9k driver. I disabled the driver (rmmod ath9k) and the problems went away. I had a PCIe wireless card I swapped in from an earlier Intel Core i5 build that used that driver. After disabling ath9k, all MY problems went away. I replaced it with a different PCIe wireless adapter that has an Intel chipset and my system has been stable ever since. I changed back all the settings that I had altered (except C6) and everything works. The old Ath9k PCIe card is stable in the Intel system I moved it back to. I'm only posting here because my bug had the exact symptoms as the ones in this thread but a completely different cause/solution. -- 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
