# svn diff
Index: firmware/thread.c
===================================================================
--- firmware/thread.c   (revision 14933)
+++ firmware/thread.c   (working copy)
@@ -1038,6 +1038,13 @@

     /* CPU will initialize first and then sleep */
     slot = find_empty_thread_slot();
+#if THREAD_EXTRA_CHECKS
+    /* This can fail if, for example, .bss isn't zero'ed out by the loader
+       or threads is in the wrong section. */
+    if (slot < 0) {
+        panicf("uninitialized threads[]");
+    }
+#endif

     cores[core].sleeping = NULL;
     cores[core].running = NULL;