I'm not sure what you did, but it looks like you just attached to aolserver and sent me the backtrace for the point where it stopped. Is that true? What I need you to do is attach to aolserver as before. Then type run in gdb, and go to webmail and recreate the segfault. When gdb halts after the segfault, then get the backtrace. Use the following command in gdb:
thread apply all bt
This should print the backtrace for all of the threads.