I was looking in logrotate 3.7.2-9 source and noticed that options "nodateext" and "pattern" are not documented in man page. Also, option "pattern" is broken because the function parsePattern should return a pointer to struct rotatePatternElement, but it returns NULL only.
Suggestion: just putting a description in man page for "nodateext" and disabling the option "pattern" (in readConfigFile) and function "parsePattern" with "#ifdef 0 ... #endif" would resolve the problem and close this bug ("pattern" is not documented, anyway).
logrotate-3.7.2-11