On Thu, Feb 02, 2023 at 03:20:37PM +0000, Al Viro wrote: > "Racy" probably had been about something along the lines of the scenario > I'd mentioned just upthread, but in 5.5 that "racy" escalated to "does not > work at all" - if you ever hit a vmalloc-related fault, you are going > to get an oops. You still get 8Gb, but beyond that it's broken. > > And it's almost certainly not the problem you are seeing... Incidentally, direct store to pgd_val() in there looks fishy wrt barriers - shouldn't there be an smp_wmb() before we shove that sucker into our top-level table's entry?
