This is Lua 5.2.1, released on 08 Jun 2012.

For installation instructions, license details, and
further information about Lua, see doc/readme.html.

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Applied fix: http://www.lua.org/bugs.html#5.2.3-2

lgc.c:
@@ -403,7 +403,7 @@
       reallymarkobject(g, gcvalue(gval(n)));  /* mark it now */
     }
   }
-  if (prop)
+  if (g->gcstate != GCSatomic || prop)
     linktable(h, &g->ephemeron);  /* have to propagate again */
   else if (hasclears)  /* does table have white keys? */
     linktable(h, &g->allweak);  /* may have to clean white keys */
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