Hello, Thanks for the CC, I'm temporarily very busy so if there's something urgent, safer to CC. This passed both testcases, the hard part was already done. I'm glad there was nothing wrong in the previous fix that had to be redone. Simply we forgot to undo the vma->vm_userfaultfd_ctx = NULL after aborting the new child uffd ctx, the original code of course didn't do that either. Having just seen this issue, this isn't very well tested. Thank you, Andrea Andrea Arcangeli (1): userfaultfd: clear the vma->vm_userfaultfd_ctx if UFFD_EVENT_FORK fails fs/userfaultfd.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>