On 9/7/23 14:22, Robert Kueffner wrote: > Is there some way to make this work, or is it generally not possible > to successfully handle exceptions if WD0=true? It's theoretically possible, but it's in a grey area. The kernel can't easily try to respect PKRU *and* override it for things like decoding userspace instructions. PKRU should get reset to a value that permits reads and writes to pkey-0 before the signal frame is created. But you're obviously tripping over it anyway. I assume that *something* is trying to access pkey-0-protected memory. Any idea what that is? Which entity is doing that access and what are they accessing? The page fault tracepoints might come in handy.
