Originally Posted by netllama
I've run with your files & script for 3 iterations, and have not been able to reproduce the problem.
Which disk drives do you use? Exact type/model-# and vendor.
In the beginning of me research I found some reports (although I think it is unlikely that they're true) where people claimed it would only happen with disk drives from some vendors (e.g. Hitachi).
Some others claimed they solved the problem by applying a firmware update to their Maxtor disks.
In the meantime I got a firmware update from Hitachi but due to our latest results with iommu/memhole mapping I didn't try them out (because I won't be able to flash the firmware back to the older version to continue my tests).