From @geeknik

Fuzzing Perl v5.25.4-20-gc2f7c0b* with AFL, ASAN and libdislocator.

1713 lines of Debug output later...
http://pastebin.com/JiMN4fZP

==19229==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000038 (pc 0x00000097c6ee bp 0x7fffba9d9130 sp 0x7fffba9d8b80 T0)
#0 0x97c6ed in Perl_sv_vcatpvfn_flags /root/perl/sv.c:12398:21
#1 0x967dc8 in Perl_sv_vsetpvfn /root/perl/sv.c:10815:5
#2 0x967dc8 in Perl_vnewSVpvf /root/perl/sv.c:9429
#3 0xc23d60 in PerlIO_vprintf /root/perl/perlio.c:4977:10
#4 0x7d4cd9 in Perl_dump_vindent /root/perl/dump.c:520:5
#5 0x7d4cd9 in Perl_dump_indent /root/perl/dump.c:511
#6 0x7e0887 in Perl_do_sv_dump /root/perl/dump.c:1580:2
#7 0x7f12a2 in Perl_sv_dump /root/perl/dump.c:2193:2
#8 0x9478b4 in Perl_sv_clear /root/perl/sv.c:6639:4
#9 0x94c452 in Perl_sv_free2 /root/perl/sv.c:6956:9
#10 0x4e38b7 in S_SvREFCNT_dec /root/perl/./inline.h:189:6
#11 0x4e38b7 in Perl_op_clear /root/perl/op.c:973
#12 0x4e2195 in Perl_op_free /root/perl/op.c:854:9
#13 0x4e1de5 in Perl_op_free /root/perl/op.c:837:21
#14 0xa23a72 in Perl_leave_scope /root/perl/scope.c:1109:6
#15 0xa56865 in S_pop_eval_context_maybe_croak /root/perl/pp_ctl.c:1605:5
#16 0xa55f26 in Perl_die_unwind /root/perl/pp_ctl.c:1733:13
#17 0x7ffa2f in Perl_vcroak /root/perl/util.c:1791:5
#18 0x7ff91c in Perl_die /root/perl/util.c:1722:5
#19 0x9b7459 in Perl_pp_divide /root/perl/pp.c:1555:17
#20 0x7f1c63 in Perl_runops_debug /root/perl/dump.c:2234:23
#21 0x5a10a6 in S_run_body /root/perl/perl.c:2525:2
#22 0x5a10a6 in perl_run /root/perl/perl.c:2448
#23 0x4de6cd in main /root/perl/perlmain.c:123:9
#24 0x7f74425e5b44 in __libc_start_main /build/glibc-uPj9cH/glibc-2.19/csu/libc-start.c:287
#25 0x4de33c in _start (/root/perl/perl+0x4de33c)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /root/perl/sv.c:12398 Perl_sv_vcatpvfn_flags
==19229==ABORTING

Uh oh!

null ptr deref, segfault Perl_sv_vcatpvfn_flags (sv.c:12398) #15563

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