+Perl's regular expression engine currently does not play very nicely
+with the fork() emulation. There are known race conditions arising
+from the regular expression engine modifying state carried in the opcode
+tree at run time (the fork() emulation relies on the opcode tree being
+immutable). This typically happens when the regex contains paren groups
+or variables interpolated within it that force a run time recompilation
+of the regex. Due to this major bug, the fork() emulation is not
+recommended for use in production applications at this time.
+
+=item *
+