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-rw-r--r--sql/lock.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/sql/lock.cc b/sql/lock.cc
index a0d6faa6604..675b94c2175 100644
--- a/sql/lock.cc
+++ b/sql/lock.cc
@@ -1533,6 +1533,7 @@ void start_waiting_global_read_lock(THD *thd)
if (unlikely(thd->global_read_lock))
DBUG_VOID_RETURN;
(void) pthread_mutex_lock(&LOCK_global_read_lock);
+ DBUG_ASSERT(protect_against_global_read_lock);
tmp= (!--protect_against_global_read_lock &&
(waiting_for_read_lock || global_read_lock_blocks_commit));
(void) pthread_mutex_unlock(&LOCK_global_read_lock);