diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c
index f94d19a690df..d3bc110430f9 100644
--- a/mm/damon/dbgfs.c
+++ b/mm/damon/dbgfs.c
@@ -309,10 +309,12 @@ static int dbgfs_before_terminate(struct damon_ctx *ctx)
 	if (!targetid_is_pid(ctx))
 		return 0;
 
+	mutex_lock(&ctx->kdamond_lock);
 	damon_for_each_target_safe(t, next, ctx) {
 		put_pid((struct pid *)t->id);
 		damon_destroy_target(t);
 	}
+	mutex_unlock(&ctx->kdamond_lock);
 	return 0;
 }