> On Jan 3, 2018, at 4:33 PM, Benjamin Gilbert <benjamin.gilbert@xxxxxxxxxx> wrote: > >> On Wed, Jan 03, 2018 at 10:20:16AM +0100, Greg Kroah-Hartman wrote: >> Ick, not good, any chance you can test 4.15-rc6 to verify that the issue >> is also there (or not)? > > I haven't been able to reproduce this on 4.15-rc6. Ah. Maybe try rebuilding a bad kernel with free_ldt_pgtables() modified to do nothing, and the read /sys/kernel/debug/page_tables/current (or current_kernel, or whatever it's called). The problem may be obvious. > > --Benjamin Gilbert