In UnixAos the heap space is dynamic. The heap grows if there is
not enough space to satisfy a NEW() and if the garbage collector
detects a totally emty memory block that block gets retuned to the
host system. Unfortunately in the neu Debian release 7 returning
the memory block via free() results in a message

   aos.linux: munmap_chunk(): invalid pointer: 0xd6de1000 ***

and a segmentation violation error while the garbage collector is
running (--> terminates Aos).

To avoid this fatal error the heap shrinking can be disabled in the
start script aos by the use of the new option 'DisableShrinkHeap 1'.


Addendum:

Debian8 has fixed this bug.