tree: gc crash due to dummy object.

* tree.c (tr_rebuild): The dummy on-stack node we use in the rebuilding
process must have its generation field set to 1 rather than 0, so it looks
like a mature heap object rather than a baby object. Otherwise
when its pointer is assigned to another node which happens to
be gen 1, the on-stack dummy will be added to the checkobj array,
and gc will try to mark it.

1 files changed, 1 insertions, 1 deletions

diff --git a/tree.c b/tree.c
index 654deccf..ee1d37c4 100644
--- a/tree.c
+++ b/tree.c
@@ -327,7 +327,7 @@ static void tr_rebuild(val tree, struct tree *tr, val node,
                        val parent, ucnum size)
 {
 #if CONFIG_GEN_GC
-  obj_t dummy = { { TNOD, 0, 0, { 0 }, 0 } };
+  obj_t dummy = { { TNOD, 0, 1, { 0 }, 0 } };
 #else
   obj_t dummy = { { TNOD, { 0 }, 0 } };
 #endif