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.
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https://bugs.launchpad.net/bugs/1970453
Title:
DMAR: ERROR: DMA PTE for vPFN 0x7bf32 already set
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