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The functionality is perhaps >> underspecified in the AMD manual. > > TBH, I don't have a reproducer yet. Just LLM stumbled upon this while > I was investigating another memory corruption issue [1]. > > [1] > https://lore.kernel.org/linux-mm/arY1Wq6R9OY20ans@pcnci.linuxbox.cz/#t What hardware are you running on? That looks like the Zen5 issue, for which you want either the latest microcode out of linux-firmware and/or https://lore.kernel.org/r/20261002211617.1001617-1-bp@kernel.org TCE is a no-op in Zen1 and later, so unless you're on older hardware, it won't be that. ~Andrew