diff -U3 /tmp/cirrus-ci-build/src/test/modules/test_shm_mq/expected/test_shm_mq.out /tmp/cirrus-ci-build/build/testrun/test_shm_mq-running/regress/results/test_shm_mq.out
--- /tmp/cirrus-ci-build/src/test/modules/test_shm_mq/expected/test_shm_mq.out	2024-12-04 13:03:57.496796000 +0000
+++ /tmp/cirrus-ci-build/build/testrun/test_shm_mq-running/regress/results/test_shm_mq.out	2024-12-04 13:11:28.381396000 +0000
@@ -29,8 +29,5 @@
 (1 row)
 
 SELECT test_shm_mq_pipelined(16384, (select string_agg(chr(32+(random()*95)::int), '') from generate_series(1,270000)), 200, 3);
- test_shm_mq_pipelined 
------------------------
- 
-(1 row)
-
+ERROR:  could not register background process
+HINT:  You may need to increase "max_worker_processes".