https://bugs.gentoo.org/949720
https://jira.mariadb.org/browse/MDEV-36036
https://jira.mariadb.org/browse/MDEV-36113
--- a/storage/innobase/include/trx0trx.h
+++ b/storage/innobase/include/trx0trx.h
@@ -671,14 +671,18 @@
   {
     ut_ad(!mutex_is_owner());
     mutex.wr_lock();
+#ifdef UNIV_DEBUG
     assert(!mutex_owner.exchange(pthread_self(),
                                  std::memory_order_relaxed));
+#endif /* UNIV_DEBUG */
   }
   /** Release the mutex */
   void mutex_unlock()
   {
+#ifdef UNIV_DEBUG
     assert(mutex_owner.exchange(0, std::memory_order_relaxed) ==
            pthread_self());
+#endif /* UNIV_DEBUG */
     mutex.wr_unlock();
   }
 #ifndef SUX_LOCK_GENERIC