Fixed by commit
5e20fb07d2b8373f53f053086ba668649763de9a
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Karl Williamson
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via perlbug: queue: perl5 status: open
https://rt.perl.org/Ticket/Display.html?id=132164
[perl #132164] signed integer overflow in S_study_chunk(regcomp.c:5444)
by Karl Williamson via RT