Heap is growing without bound

[Marc Singer]

I'm using guile in a program intended to run continuously for years.
I'm observing that the freestore is growing without bound.  What can I
do to discover the cause for this?  

I've determined that alloc_some_heap is being called every few hours
to add about 300K of space to the freestore.  I'm not sure that the
allocations in the freestore are growing.  My vmsize is getting larger
as is the size of the working set.