Tighten TAP tests' tracking of postmaster state some more.

Commits 6c4a8903b et al. had a couple of deficiencies:

* The logic I added to Cluster::start to see if a PID file is present
could be fooled by a stale PID file left over from a previous
postmaster.  To fix, if we're not sure whether we expect to find a
running postmaster or not, validate the PID using "kill 0".

* 017_shm.pl has a loop in which it just issues repeated Cluster::start
calls; this will fail if some invocation fails but leaves self->_pid
set.  Per buildfarm results, the above fix is not enough to make this
safe: we might have "validated" a PID for a postmaster that exits
immediately after we look.  Hence, match each failed start call with
a stop call that will get us back to the self->_pid == undef state.
Add a fail_ok option to Cluster::stop to make this work.

Discussion: https://postgr.es/m/CA+hUKGKV6fOHvfiPt8=dOKzvswjAyLoFoJF1iQXMNpi7+hD1JQ@mail.gmail.com

diff --git a/src/test/perl/PostgresNode.pm b/src/test/perl/PostgresNode.pm
index 11227408c3b3f2bda3bc0f8ff75d49116ff0b1a8..b85068e0da1aaabec2cf55e08f30fcf8d5226494 100644 (file)
--- a/src/test/perl/PostgresNode.pm
+++ b/src/test/perl/PostgresNode.pm
@@ -831,20 +831,37 @@ Note: if the node is already known stopped, this does nothing.
 However, if we think it's running and it's not, it's important for
 this to fail.  Otherwise, tests might fail to detect server crashes.
 
+With optional extra param fail_ok => 1, returns 0 for failure
+instead of bailing out.
+
 =cut
 
 sub stop
 {
-   my ($self, $mode) = @_;
-   my $port   = $self->port;
+   my ($self, $mode, %params) = @_;
    my $pgdata = $self->data_dir;
    my $name   = $self->name;
+   my $ret;
    $mode = 'fast' unless defined $mode;
-   return unless defined $self->{_pid};
+   return 1 unless defined $self->{_pid};
+
    print "### Stopping node \"$name\" using mode $mode\n";
-   TestLib::system_or_bail('pg_ctl', '-D', $pgdata, '-m', $mode, 'stop');
+   $ret = TestLib::system_log('pg_ctl', '-D', $pgdata,
+       '-m', $mode, 'stop');
+
+   if ($ret != 0)
+   {
+       print "# pg_ctl stop failed: $ret\n";
+
+       # Check to see if we still have a postmaster or not.
+       $self->_update_pid(-1);
+
+       BAIL_OUT("pg_ctl stop failed") unless $params{fail_ok};
+       return 0;
+   }
+
    $self->_update_pid(0);
-   return;
+   return 1;
 }
 
 =pod
@@ -1066,9 +1083,20 @@ sub _update_pid
    if (open my $pidfile, '<', $self->data_dir . "/postmaster.pid")
    {
        chomp($self->{_pid} = <$pidfile>);
-       print "# Postmaster PID for node \"$name\" is $self->{_pid}\n";
        close $pidfile;
 
+       # If we aren't sure what to expect, validate the PID using kill().
+       # This protects against stale PID files left by crashed postmasters.
+       if ($is_running == -1 && kill(0, $self->{_pid}) == 0)
+       {
+           print
+             "# Stale postmaster.pid file for node \"$name\": PID $self->{_pid} no longer exists\n";
+           $self->{_pid} = undef;
+           return;
+       }
+
+       print "# Postmaster PID for node \"$name\" is $self->{_pid}\n";
+
        # If we found a pidfile when there shouldn't be one, complain.
        BAIL_OUT("postmaster.pid unexpectedly present") if $is_running == 0;
        return;

diff --git a/src/test/recovery/t/017_shm.pl b/src/test/recovery/t/017_shm.pl
index dc0dcd3ca275a9017fe7ffa9e41d2782e35344f0..ba6410a7aa396f354a341c2a81df792568692d65 100644 (file)
--- a/src/test/recovery/t/017_shm.pl
+++ b/src/test/recovery/t/017_shm.pl
@@ -204,6 +204,9 @@ sub poll_start
        # Wait 0.1 second before retrying.
        usleep(100_000);
 
+       # Clean up in case the start attempt just timed out or some such.
+       $node->stop('fast', fail_ok => 1);
+
        $attempts++;
    }