Seems that a glob(undef) triggers an ACCVIO in Perl_flex_stat,
when a NULL is passed for the filename string pointer.
From Charles Lane.
p4raw-id: //depot/perl@12381
char temp_fspec[NAM$C_MAXRSS+300];
int retval = -1;
+ if (!fspec) return retval;
strcpy(temp_fspec, fspec);
if (statbufp == (Stat_t *) &PL_statcache)
do_tovmsspec(temp_fspec,namecache,0);