Ditto on 5.10.1 on debian sid x64.

(gdb) run /tmp/blah.pl
Starting program: /usr/bin/debugperl /tmp/blah.pl
[Thread debugging using libthread_db enabled]
Using minimum thread stack size of 16384 at /usr/lib/perl/5.10/threads
+.pm line 49.
[New Thread 0xb7c84b70 (LWP 10226)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7c84b70 (LWP 10226)]
Perl_sv_gets (my_perl=0x83efb18, sv=0x84f6bac, fp=0x840afcc, append=0)
+ at sv.c:6620
6620    sv.c: No such file or directory.
        in sv.c
(gdb) bt
#0  Perl_sv_gets (my_perl=0x83efb18, sv=0x84f6bac, fp=0x840afcc, appen
+d=0) at sv.c:6620
#1  0x080949d0 in Perl_filter_read (my_perl=0x83efb18, idx=0, buf_sv=0
+x84f6bac, maxlen=0) at toke.c:2955
#2  0x08094dcd in S_filter_gets (my_perl=<value optimized out>, sv=0x8
+4f6bac, fp=<value optimized out>, append=0) at toke.c:2997
#3  0x080a34ec in Perl_yylex (my_perl=0x83efb18) at toke.c:3757
#4  0x080b6d36 in Perl_yyparse (my_perl=0x83efb18) at perly.c:409
#5  0x08179991 in S_doeval (my_perl=0x83efb18, gimme=0, startop=0x0, o
+utside=0x0, seq=886) at pp_ctl.c:2981
#6  0x0819030c in Perl_pp_require (my_perl=0x83efb18) at pp_ctl.c:3573
#7  0x080e91a8 in Perl_runops_debug (my_perl=0x83efb18) at dump.c:1968
#8  0x0807fde2 in Perl_call_sv (my_perl=0x83efb18, sv=0x84f676c, flags
+=4) at perl.c:2717
#9  0xb7ca26aa in S_ithread_run (arg=0x82c0220) at threads.xs:440
#10 0xb7f9c7b0 in start_thread () from /lib/libpthread.so.0
#11 0xb7f1c8fe in clone () from /lib/libc.so.6
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Edit: Taking out the stack_size option to use lets the script run:

cthulhu:/tmp# ./blah.pl
server:278652 client:278652 cycles: 1774.854/sec
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