if fail_on_status is used, mod_jk segfaults when a reply with this status is received. Problem is a wrong order of arguments to the jk_log() function in file native/commons/jk_ajp_common.c on line 1851.
Created attachment 19412 [details] fix for segfault when using fail_on_status
Sorry for the trouble, thanks for the patch. Will be part of 1.2.21. As a workaround you might consider decreasing the log level to warn.
Move a couple of fixed JK issues from resolved to closed.