--- /dev/null
+Index: nfs-utils-1.0.10/utils/mountd/cache.c
+===================================================================
+--- nfs-utils-1.0.10.orig/utils/mountd/cache.c
++++ nfs-utils-1.0.10/utils/mountd/cache.c
+@@ -381,6 +381,12 @@ void cache_export(nfs_export *exp)
+ {
+ FILE *f;
+
++ if (exp->m_export.e_maptype != CLE_MAP_IDENT) {
++ xlog(L_ERROR, "%s: unsupported mapping; kernel supports only 'identity' (default)",
++ exp->m_export.m_path);
++ return;
++ }
++
+ f = fopen("/proc/net/rpc/auth.unix.ip/channel", "w");
+ if (!f)
+ return;