Broken regression testing on Intel Darwin9

[Dominique Dhumieres]

At revision 130629 regtesting on Intel Darwin9 gives a dozen

The process has forked and you cannot use this CoreFoundation functionality safely. You MUST exec().
Break on __THE_PROCESS_HAS_FORKED_AND_YOU_CANNOT_USE_THIS_COREFOUNDATION_FUNCTIONALITY___YOU_MUST_EXEC__() to debug.

then stop to do anything untill I kill it. I did not see that with revision 130589.
What is the meaning of the message? and what could I do?

TIA

Dominique