diff -p --exclude='*~' --exclude='*.orig' --exclude='*.rej' -ur httpd-2.2.21.orig/modules/dav/main/props.c httpd-2.2.21/modules/dav/main/props.c
--- httpd-2.2.21.orig/modules/dav/main/props.c	2012-01-30 15:51:59.000000000 +0100
+++ httpd-2.2.21/modules/dav/main/props.c	2012-01-30 15:52:53.000000000 +0100
@@ -563,6 +563,9 @@ DAV_DECLARE(void) dav_close_propdb(dav_p
         (*propdb->db_hooks->close)(propdb->db);
     }
 
+    if (propdb->subreq)
+        ap_destroy_sub_req(propdb->subreq);
+
     /* Currently, mod_dav's pool usage doesn't allow clearing this pool. */
 #if 0
     apr_pool_destroy(propdb->p);
@@ -576,6 +579,9 @@ void dav_close_propdb2(dav_propdb *propd
         (*propdb->db_hooks->close)(propdb->db);
     }
 
+    if (propdb->subreq)
+        ap_destroy_sub_req(propdb->subreq);
+
     apr_pool_destroy(propdb->p);
     return;
 }