Weird XXX comment in pp_ctl.c

S_run_user_filter in pp_ctl.c contains this comment:

/* I was having segfault trouble under Linux 2.2.5 after a
    parse error occurred.  (Had to hack around it with a test
    for PL_parser->error_count == 0.)  Solaris doesn't segfault --
    not sure where the trouble is yet.  XXX */

This comment was originally introduced in commit bbed91b5 in 1999 
("alpha-stage support for user-hooks in @INC"). Does anyone know what 
this comment refers to?

-- 
Lukas Mai <plokinom@gmail.com>

• Weird XXX comment in pp_ctl.c by Lukas Mai