As you know, this script may produce up to 100 errors and unlimited warnings.

However the recursion level reaches typically more than 1000.
And often the approach with following all forward references whatsoever,
ends up in a loop where the same node is browsed over and over again.

The problem with that is when a warning or error message is produced
the warning includes a call stack. And even if the server has only
a minor problem, it this will produce thousands of warnings,
and each having a callstack of 1000 identical entries.

So the CTT quickly runs out of memory and crashes.