http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=505851

From: Wolfram Sang <w.sang@pengutronix.de>

The lockfile_create-function still contains some debug code, which
considers a lock stale after 10 seconds instead of 5 minutes. As
the documentation suggests refreshing the lock every 60 seconds,
programs might lose the lock unexpectedly. Found while researching
#505278.

--- a/lockfile.c	2008-07-25 06:23:11.000000000 +1000
+++ b/lockfile.c	2010-02-14 11:09:03.000000000 +1100
@@ -391,13 +391,10 @@ int lockfile_check(const char *lockfile,
 	 *	Without a pid in the lockfile, the lock
 	 *	is valid if it is newer than 5 mins.
 	 */
-#if 0
+
 	if (now < st.st_mtime + 300)
 		return 0;
-#else
-	if (now < st.st_mtime + 10)
-		return 0;
-#endif
+
 	return -1;
 }