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SubjectAMD IOMMU causing filesystem corruption
Date
I filed a bug in bugzilla, but I wasn't sure what category to put it in, 
so I suspect I ended up picking one that doesn't get looked at much.

https://bugzilla.kernel.org/show_bug.cgi?id=195051

The issue is that on a specific Acer laptop with a dual-core A9, if I
don't disable the IOMMU using iommu=off, it has immediate and rapidly
fatal filesystem corruption by the time a user logs into the desktop.
What led me to try that was at one point I noticed an error message
about the iommu in the logs. However, I did not have a chance to save
that due to the corruption obliterating the log files.

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