Simpler test  perl -e " use open qw{:encoding(UTF-8) :std}; fork; "

c0000005 exception at encoding+0x356a

<Reveal this spoiler or all spoilers in this node or all in this thread>

there are a few recent bug reports
#111344: warnings FATAL => utf8 not working on PerlIO::encoding layer and open pragma
#115262: PerlIO::encoding produces malformed utf8
#115692: PerlIO::encoding can croak, aborting cleanup
PUSHSTACKi/POPSTACK#98060: possible bug in PerlIO::encoding

and http://perl5.git.perl.org/perl.git/history/HEAD:/ext/PerlIO-encoding shows very recent edits

but , while compiling the very latest works, the tests fail with Unknown PerlIO layer "encoding"

<Reveal this spoiler>

So you should probably perlbug this, and maybe mention this thread and probably that PUSHSTACKi report

In reply to Re: Parallel::ForkManager and utf8::all crash perl on Windows ( use open qw{:encoding(UTF-8) :std}; fork; ## PerlIO/encoding.dll ) by Anonymous Monk
in thread Parallel::ForkManager and utf8::all crash perl on Windows by szabgab

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