--- a/mm/mmu_notifier.c~mm-mmu_notifier-fix-mmget-assert-in-__mmu_interval_notifier_insert +++ a/mm/mmu_notifier.c @@ -913,7 +913,7 @@ static int __mmu_interval_notifier_inser return -EOVERFLOW; /* Must call with a mmget() held */ - if (WARN_ON(atomic_read(&mm->mm_count) <= 0)) + if (WARN_ON(atomic_read(&mm->mm_users) <= 0)) return -EINVAL; /* pairs with mmdrop in mmu_interval_notifier_remove() */