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e3ace39
(Get the code!)
Looking at the git log - I wonder if this could be related?
commit 94bb804e1e6f0a9
Author: Pavel Tatashin <email address hidden>
Date: Tue Nov 19 17:10:06 2019 -0500
arm64: uaccess: Ensure PAN is re-enabled after unhandled uaccess fault
It's interesting because ThunderX is somewhat unique in our test cluster as not having HW PAN.
We also only recently merged this into our 4.15 tree - Ubuntu-4.15.0-73.82 was the first tree to have it. I'll restart testing on our latest 4.15 (w/ this patch) to see if the issue persists.