Well I've now hit 3 weeks of uptime with C6 disabled in the BIOS and GRUB_CMDLINE_LINUX_DEFAULT="rcu_nocbs=0-15 processor.max_cstate=1"
and 4.14.6 built from the mainline kernel repo. At this point I'm satisfied that for me at least my Ryzen is now stable.
Well I've now hit 3 weeks of uptime with C6 disabled in the BIOS and LINUX_DEFAULT= "rcu_nocbs= 0-15 processor. max_cstate= 1"
GRUB_CMDLINE_
and 4.14.6 built from the mainline kernel repo. At this point I'm satisfied that for me at least my Ryzen is now stable.