main.flush_read_lock fails with timeout in wait_condition.inc

./mtr --debug-server main.flush_read_lock

main.flush_read_lock                     [ fail ]
        Test ended at 2018-07-23 14:18:19

CURRENT_TEST: main.flush_read_lock
--- /mnt/hgfs/repos/percona-server/mysql-test/r/flush_read_lock.result  2018-07-20 14:52:01.000000000 +0300
+++ /home/yura/addon/percona-build-5.7-debug/mysql-test/var/log/flush_read_lock.reject  2018-07-23 14:18:19.538526491 +0300
@@ -1494,6 +1494,9 @@
 analyze table t3_trans;
 # Switching to connection 'con1'.
 # Check that ANALYZE TABLE is blocked.
+Timeout in wait_condition.inc for select count(*) = 1 from information_schema.processlist
+where state = "Waiting for commit lock" and
+info = "analyze table t3_trans"
 unlock tables;
 # Switching to connection 'default'.
 # Reap ANALYZE TABLE

mysqltest: Result content mismatch