--- xenomai-2.5.0.orig/src/skins/native/task.c
+++ xenomai-2.5.0/src/skins/native/task.c
@@ -148,9 +148,9 @@
 
 	if (!stksize)
 		stksize = 32 * 1024;
-	if (stksize < PTHREAD_STACK_MIN)
-		stksize = PTHREAD_STACK_MIN;
-
+	if (stksize < (PTHREAD_STACK_MIN + sizeof(struct xnsig)))
+		stksize = PTHREAD_STACK_MIN + sizeof(struct xnsig);
+	
 	pthread_attr_setinheritsched(&thattr, PTHREAD_EXPLICIT_SCHED);
 	memset(&param, 0, sizeof(param));
 	if (prio > 0) {