1 files changed, 3 insertions, 0 deletions

diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c
index 1a53d497a8c5..963b7034a51b 100644
--- a/lib/percpu-refcount.c
+++ b/lib/percpu-refcount.c
@@ -120,6 +120,9 @@ static void percpu_ref_kill_rcu(struct rcu_head *rcu)
 
         atomic_add((int) count - PCPU_COUNT_BIAS, &ref->count);
 
+        WARN_ONCE(atomic_read(&ref->count) <= 0, "percpu ref <= 0 (%i)",
+                  atomic_read(&ref->count));
+
         /* @ref is viewed as dead on all CPUs, send out kill confirmation */
         if (ref->confirm_kill)
                 ref->confirm_kill(ref);