Per buildfarm member mandrill. The test is new in v15, so no back-patch.
$node->safe_psql('postgres',
q{CREATE TABLE t AS SELECT a FROM generate_series(1,10000) AS a;});
-my $sigchld_bb_timeout = IPC::Run::timer(60);
+my $sigchld_bb_timeout =
+ IPC::Run::timer($PostgreSQL::Test::Utils::timeout_default);
my ($sigchld_bb_stdin, $sigchld_bb_stdout, $sigchld_bb_stderr) = ('', '', '');
my $sigchld_bb = IPC::Run::start(
[