Apache child pid segfault + APD

I recently installed APD to help profile some code that I've written, and noticed that whenever I run it (with apd_set_pprof_trace() at the top) I get these errors in my apache logs. I spent awhile looking at different sites, but even recompiling PHP + Apache didn't help. Anyone seen this before? [Fri May 02 21:20:56 2008] [notice] child pid 13818 exit signal Segmentation fault (11) [Fri May 02 21:40:08 2008] [notice] child pid 14820 exit signal Segmentation fault (11) [Fri May 02 21:40:08 2008] [notice] child pid 15027 exit signal Segmentation fault (11) [Fri May 02 22:00:08 2008] [notice] child pid 16081 exit signal Segmentation fault (11) *** glibc detected *** free(): invalid pointer: 0x0000002a9956d000 *** [Fri May 02 22:00:10 2008] [notice] child pid 15273 exit signal Aborted (6)