Thank you for the review. All the changes suggested in the v52comments.diff are incorporated in the attached patches.
+#Server should have thrown error +$node->psql( + 'postgres', + qq(select pg_get_process_memory_contexts($pid, true);), + stderr => \$psql_err);
This test doesn't validate that the server actually errored does it? (There is no proposed fix in the attached.)
This has been fixed by adding a check for the error returned by the above command.
While at it, I also added another crash test to the file, This is similar to the existing test for a client backend crash, but in this scenario, it crashes the server process instead.
