null ptr deref, segfault Perl_sv_vcatpvfn_flags (sv.c:12398) #15563
Fuzzing Perl v5.25.4-20-gc2f7c0b* with AFL, ASAN and libdislocator.
1713 lines of Debug output later...
==19229==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000038 (pc 0x00000097c6ee bp 0x7fffba9d9130 sp 0x7fffba9d8b80 T0)
AddressSanitizer can not provide additional info.
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