I have bisected this, and the commit that *fixes* this between the focal kernel (5.15.0-30-generic) and the current 5.17 release is
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2f46993d83ff4abb310ef7b4beced56ba96f0d9d x86: change default to spec_store_bypass_disable=prctl spectre_v2_user=prctl Switch the kernel default of SSBD and STIBP to the ones with CONFIG_SECCOMP=n (i.e. spec_store_bypass_disable=prctl spectre_v2_user=prctl) even if CONFIG_SECCOMP=y. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973839 Title: 5.15.0-30-generic : unchecked MSR access error: WRMSR to 0x48 (tried to write 0x0000000000000004) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973839/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
