$self->begin_txn_lazy;
my $n = read($r, my $msg, $bytes) or die "read: $!\n";
$n == $bytes or die "short read: $n != $bytes\n";
$self->begin_txn_lazy;
my $n = read($r, my $msg, $bytes) or die "read: $!\n";
$n == $bytes or die "short read: $n != $bytes\n";