*** glibc detected *** gdb: malloc(): smallbin double linked list

[Lawrence D'Oliveiro]

In message <pan.2010.11.05.21.30.11.656000 at nowhere.com>, Nobody wrote:

> I imagine that your extension code is trashing the heap, in which case,
> valgrind is probably the answer.

Something simpler to try first is to run the code with the MALLOC_CHECK_ 
environment variable set to 2 or 3. That might give a few more clues.