This 'seems' to be a modperl issue. My configuration. I needed a 1.1 compliant reverse proxy in order to support Chunked encoding for an xml gateway.
Since only Apache 2.0 has a 1.1 compliant reverse proxy I replaced my Apache 1.3.14 standard apache wth an Apache 2.0.28 with the proxy support compiled in. My modperl server on the backend is still running as 1.3.14. The 2.0.28 proxy uses mod_rewrite. When it rewrites url's internally to go to a static apache server all works great! However, when it rewrites to my modperl 1.3.14 server apache 2.0.28 children start segfaulting left and right with a code 11. I can not find any reference to this on the 2.0 mailing lists/groups. Does anyone know why Apache 2.0 running as a rewrite reverse proxy would die only when it talks to my modperl servers? This is destroying my development time and about to kill me on some significant deadlines :( John-