diff --git a/include/linux/mm.h b/include/linux/mm.h
index de6db27e26b2..a54aca9bba65 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1542,6 +1542,12 @@ int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
 #ifdef CONFIG_SPECULATIVE_PAGE_FAULT
 static inline void vm_write_begin(struct vm_area_struct *vma)
 {
+        /*
+         * Isolated vma might be freed without exclusive mmap_lock but
+         * speculative page fault handler still needs to know it was changed.
+         */
+        if (!RB_EMPTY_NODE(&vma->vm_rb))
+		WARN_ON_ONCE(!rwsem_is_locked(&(vma->vm_mm)->mmap_sem));
 	/*
 	 * The reads never spins and preemption
 	 * disablement is not required.