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KPTI+CFI on x86 trips over something in entry code #23
There seems to be some generated code that is being run at syscall entry that is not mapped. I suspect there is something still doing CFI checks on entry (and their resulting jump tables are missing), but I haven't found them yet. For now, disable KPTI under CFI (at run time, so test kernels can still boot with "pti" to enable it again).