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Will there be a forthcoming 5.0.3 to fix this and any other known bugs? I use the LuaBinaries and don't want to compile my own version unless necessary.


Tom Reahard

Roberto Ierusalimschy wrote:

There seems to be a stupid bug in the collection of weak tables in Lua
5.0.2. Once a weak table survives a garbage collection, it is never
collected. A simple example is like this:

 a = {}
 for i = 1, 10000 do
   a[i] = setmetatable({}, {__mode = "v"})
 a = nil
 print(gcinfo())     -- should be near the first value...

The patch is a single line in lgc.c:

@@ -366,7 +366,7 @@
  GCObject *curr;
  int count = 0;  /* number of collected items */
  while ((curr = *p) != NULL) {
-    if (curr->gch.marked > limit) {
+    if ((curr->gch.marked & ~(KEYWEAK | VALUEWEAK)) > limit) {
      p = &curr->;

(Bug reported by Chromix.)

As far as we checked, this bug is not present in Lua 5.1 beta.

-- Roberto