--- x/fs/proc/task_mmu.c
+++ t/fs/proc/task_mmu.c
@@ -274,6 +274,7 @@ static void show_vma_header_prefix(struc
 static void
 show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
 {
+	struct proc_maps_private *priv = m->private;
 	struct mm_struct *mm = vma->vm_mm;
 	struct file *file = vma->vm_file;
 	vm_flags_t flags = vma->vm_flags;
@@ -294,7 +295,11 @@ show_map_vma(struct seq_file *m, struct
 	start = vma->vm_start;
 	end = vma->vm_end;
 	show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino);
-	anon_name = anon_vma_name(vma);
+
+	if (mm == priv->mm)
+		anon_name = anon_vma_name(vma);
+	else
+		anon_name = NULL;
 
 	/*
 	 * Print the dentry name for named mappings, and a