Linux Patched for a New AMD Zen 4 CPU Bug – Erratum #1485
phoronix.com
phoronix.com
Upstream commit is here[1]
Glad to see it has been root caused and worked around in such short order.
[0] https://news.ycombinator.com/item?id=37812556
[1] https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/...