Index: ksrc/skins/posix/syscall.c
===================================================================
--- ksrc/skins/posix/syscall.c	(révision 2429)
+++ ksrc/skins/posix/syscall.c	(copie de travail)
@@ -202,13 +202,19 @@
 
 	err = pthread_create(&k_tid, &attr, NULL, NULL);
 
-	if (err)
+	if (err) {
+		printk("pthread_create returned %d\n", err);
 		return ERR_PTR(-err);
+	}
 
 	err = xnshadow_map(&k_tid->threadbase, NULL);
+	if (err)
+		printk("xnshadow_map returned %d\n", err);
 
-	if (!err && !__pthread_hash(hkey, k_tid))
+	if (!err && !__pthread_hash(hkey, k_tid)) {
+		printk("pthread_hash returned NULL\n");
 		err = -EAGAIN;
+	}
 
 	if (err)
 		pse51_thread_abort(k_tid, NULL);
@@ -244,8 +250,10 @@
 		/* If the syscall applies to "current", and the latter is not
 		   a Xenomai thread already, then shadow it. */
 		k_tid = __pthread_shadow(curr, &hkey);
-		if (IS_ERR(k_tid))
+		if (IS_ERR(k_tid)) {
+			printk("__pthread_shadow: %d\n", PTR_ERR(k_tid));
 			return PTR_ERR(k_tid);
+		}
 
 		promoted = 1;
 	}