PerlIO::eol core dumps (illegal instruction) in a docker alpine container

[Yuri Kanivetsky via Gcc-help <gcc-help@xxxxxxxxxxx>]

Hi,

$ cat a.sh
apk add perl-dev perl-utils perl-libwww perl-lwp-protocol-https build-base gdb
cpan -g PerlIO::eol || true
tar xf Perl*
cd Perl*
sed -Ei '/\bWriteMakefile\b/i\\n$WriteMakefileArgs{OPTIMIZE} = "-g3
-gdwarf-4 -O";' Makefile.PL
# sed -Ei '/\bWriteMakefile\b/i\\n$WriteMakefileArgs{OPTIMIZE} =
"-O0";' Makefile.PL
perl Makefile.PL
make install
cd /app
gdb -ex 'break PerlIOEOL_fill' -ex r --args perl a.pl

$ cat a.pl
use strict;
use warnings;
open my $fh, '<:raw:eol(LF)', 'a.txt';
my $l = <$fh>;
print $l, "\n";

$ echo -e 'line 1\nline 2\r\nline 3' > a.txt

$ docker run --rm -itv $PWD:/app alpine:3.17 sh -eux app/a.sh
...
Breakpoint 1, PerlIOEOL_fill (my_perl=0x7f977d80e020,
f=0x7f977d7ea180) at eol.xs:117
117     {
(gdb) c
Continuing.

Program received signal SIGILL, Illegal instruction.
PerlIOEOL_fill (my_perl=<optimized out>, f=<optimized out>) at eol.xs:132
132             Copy(start, ptr, i - start, STDCHAR);
(gdb) backtrace
#0  PerlIOEOL_fill (my_perl=<optimized out>, f=<optimized out>) at eol.xs:132
#1  0x00007f977d970a74 in Perl_PerlIO_fill () from
/usr/lib/perl5/core_perl/CORE/libperl.so
#2  0x00007f977d973353 in PerlIOBase_read () from
/usr/lib/perl5/core_perl/CORE/libperl.so
#3  0x00007f977d9733e9 in PerlIO_getc () from
/usr/lib/perl5/core_perl/CORE/libperl.so
#4  0x00007f977d91a5df in Perl_sv_gets () from
/usr/lib/perl5/core_perl/CORE/libperl.so
#5  0x00007f977d9037de in Perl_do_readline () from
/usr/lib/perl5/core_perl/CORE/libperl.so
#6  0x00007f977d8fe780 in Perl_runops_standard () from
/usr/lib/perl5/core_perl/CORE/libperl.so
#7  0x00007f977d8841ba in perl_run () from
/usr/lib/perl5/core_perl/CORE/libperl.so
#8  0x000055ca41b3b1db in main ()

But with -O0 it supposedly works. What's going on here? How do I debug it?

Regards,
Yuri