On Mon, Jan 09, 2023 at 12:31:31PM -0500, Dennis Dalessandro wrote: > + if (fd->use_mn) { > + ret = mmu_interval_notifier_insert( > + &tidbuf->notifier, current->mm, > + tidbuf->vaddr, tidbuf->npages * PAGE_SIZE, > + &tid_cover_ops); This is still not the right way to use these notifiers, you should be removing the calls to mmu_notifier_register() Jason