segfault on apache startup with --enable-debug

Hello internals, I get a segfault when starting apache with debug enabled in the php build. I am using the latest 5_1 cvs, and apache 1.3 The backtrace i get in gdb is attached. Is that likely to be caused with memory handling in an extension module? It works fine in non-debug, but i am just trying to make sure i have cleaned up properly in an extension i am building. Thanks