I have reported the problem once here on the list, and today again,
on the bugtracker:
http://gborg.postgresql.org/project/slony1/bugs/bugupdate.php?1457

The patch fixes the most obvious point of failure, but it seems there
are other places in the code where similar problem may occur ("rc",
result from file operation, is ignored most of time).

Greets,
        Jacek
-------------- next part --------------
diff -dur -x '*.orig' -x '*~' slony1-1.1.2.orig/src/slon/remote_worker.c slony1-1.1.2/src/slon/remote_worker.c
--- slony1-1.1.2.orig/src/slon/remote_worker.c	2005-10-12 23:14:25.000000000 +0200
+++ slony1-1.1.2/src/slon/remote_worker.c	2005-11-02 12:40:01.000000000 +0100
@@ -4870,7 +4870,12 @@
 			     "commit;\n"
 			     "vacuum analyze %s.sl_setsync_offline;\n", 
 			     rtcfg_namespace);
+		if ( rc < 0 ) 
+			return -1;
 		rc = fclose(archive_fp);
+		archive_fp = NULL;
+		if ( rc < 0 ) 
+			return -1;
 		rc = rename(archive_tmp, archive_name);
 	}
 	return rc;