Interesting. I can't get it to dump core under Perl 5.6.1 on one Linux box, but it does dump core under another -- also running Linux and Perl 5.6.1. The main difference is that the second machine is running a hand-built threaded perl. Hrm -- strange. Anyways, I get a similar output from gdb:

(gdb) bt
#0  0x080e4730 in Perl_re_intuit_start () at eval.c:41
#1  0x080e4433 in Perl_re_intuit_start () at eval.c:41
#2  0x080a38ae in Perl_pp_match () at eval.c:41
#3  0x080a0fba in Perl_runops_standard () at eval.c:41
#4  0x0805dd3c in perl_run () at eval.c:41
#5  0x0805da58 in perl_run () at eval.c:41
#6  0x0805b226 in main () at eval.c:41
#7  0x40090177 in __libc_start_main (main=0x805b1b0 <main>, argc=4, ub
+p_av=0xbffff9ec, init=0x805a33c <_init>, 
    fini=0x80f4460 <_fini>, rtld_fini=0x4000e184 <_dl_fini>, stack_end
+=0xbffff9dc)
    at ../sysdeps/generic/libc-start.c:129
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perl -pe '"I lo*`+$^X$\"$]!$/"=~m%(.*)%s;$_=$1;y^`+*^e v^#$&V"+@( NO CARRIER'