I hit this bug upgrading my home server (proliant microserver gen9) and it seems to be causing memory corruption when it occurs ( at least in combination with zfs ). Using zfs mirrored root I experienced this issue after only a few minutes uptime, with DMAR messages flooding the log and very high CPU usage.
After rebooting with intel_iommu=off things are back to normal, but a zfs scrub indicated several thousand checksum errors detected on the root volume, some of them unrecoverable that had to be restored from backup, and a separate zfs RAIDZ1 volume experienced corrupted metadata and had to be rolled back with some data loss. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1970453 Title: DMAR: ERROR: DMA PTE for vPFN 0x7bf32 already set To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1970453/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
