From https://github.com/Perl/perl5/issues/18617#issuecomment-822056978 by Leont --- a/src/modules/perl/modperl_perl.c +++ a/src/modules/perl/modperl_perl.c @@ -268,7 +268,7 @@ #ifdef MP_NEED_HASH_SEED_FIXUP if (MP_init_hash_seed_set) { #if MP_PERL_VERSION_AT_LEAST(5, 17, 6) - memcpy(&PL_hash_seed, &MP_init_hash_seed, + memcpy(PL_hash_seed, &MP_init_hash_seed, sizeof(PL_hash_seed) > sizeof(MP_init_hash_seed) ? sizeof(MP_init_hash_seed) : sizeof(PL_hash_seed)); PL_hash_seed_set = MP_init_hash_seed_set;