--- x/fs/proc/task_mmu.c
+++ y/fs/proc/task_mmu.c
@@ -187,6 +187,7 @@ static struct vm_area_struct *get_next_v
 }
 
 #else /* CONFIG_PER_VMA_LOCK */
+static void unlock_vma(struct proc_maps_private *priv) {}
 
 static inline bool lock_vma_range(struct seq_file *m,
 				  struct proc_maps_private *priv)
@@ -582,6 +583,7 @@ skip_vma:
 	if (flags & PROCMAP_QUERY_COVERING_OR_NEXT_VMA)
 		goto next_vma;
 
+	unlock_vma(priv);
 no_vma:
 	return ERR_PTR(-ENOENT);
 }