On Mon, May 10, 2021 at 11:46 PM Axel Rasmussen <axelrasmussen@xxxxxxxxxx> wrote: > > Thanks for the investigation, Mike! > > Mina, since hugetlb_mcopy_atomic_pte is specific to userfaultfd, I'm > happy to take a deeper look at it this week as well. > > For context, we have seen the WARN_ON Mina described trigger in > production before, but were never able to reproduce it. The > userfaultfd self test turns out to reproduce it reliably, so the > thinking up to this point was that it just happened to reproduce some > non-userfaultfd-specific issue. But from Mike's description, it seems > this bug is very specific to userfaultfd after all. :) > That's fine, I'll take an initial look at least. If I end up being roped into userfaultfd stuff way over my head I'll solicit your help or punt it over to you.Thanks!
