pthread_atfork problems

[Bill Medland]

Any chance of a hand with this please?

I have just traced a problem to the fact that __pthread_atfork is passed a
couple of null pointers, which I presume is an illegal thing to do.  Can
anyone point me at the code that results in __pthread_atfork being called
and/or explain why it would be called with null pointers?

TIA

Bill