Okay, I see the issue. The shared-manager process is exiting from receiving the signal. Thus, not able to respond to later requests. Hence stalling the script.

Inside MCE::Shared::Server.pm around line 461, comment out the handler code and add the subsequent line. Basically, the shared-manager must still respond to requests inside application handlers. I'm not sure if I can handle both cases. This handler was placed here in the event something killed the shared-manager process.

sub _loop {
   $_is_client = 0;

 # $SIG{HUP} = $SIG{INT} = $SIG{QUIT} = $SIG{TERM} = sub {
 #    $SIG{INT} = $SIG{$_[0]} = sub { };
 #
 #    CORE::kill($_[0], $_is_MSWin32 ? -$$ : -getpgrp);
 #    for my $_i (1..15) { sleep 0.060 }
 #
 #    CORE::kill('KILL', $$);
 #    CORE::exit(255);
 # };

   $SIG{HUP} = $SIG{INT} = $SIG{QUIT} = $SIG{TERM} = sub { };

   ...
}
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I've simplyfied the handling for the MCE script.

use strict; use warnings; use feature 'say';
use Data::Dumper; ++$Data::Dumper::Sortkeys;
use Time::HiRes 'sleep';
use MCE::Loop;
use MCE::Shared;
$|++;

my $pid = $$; say "PID $pid";
my $hash = MCE::Shared->hash();

$SIG{'INT'} = $SIG{'TERM'} = sub {
    my $signal = shift; $SIG{'INT'} = $SIG{'TERM'} = sub {};
    say "Hello from $signal: $$";
    say 'Parent is ready to dump';
    say 'Dumping: ' . Dumper $hash->export;
    MCE::Signal::stop_and_exit('INT');
};

MCE::Loop->init(
    max_workers => 2, chunk_size => 1, user_begin => sub {
        $SIG{'INT'} = sub {
            my $signal = shift;
            say "Hello from $signal: $$";
            MCE->exit(0);
        };
        $SIG{'TERM'} = sub {
            my $signal = shift;
            say "Hello from $signal: $$";
            MCE::Signal::stop_and_exit($signal);
        };
    }
);

mce_loop {
    my ( $mce, $chunk_ref, $chunk_id ) = @_;
    say sprintf 'Forked worker in slot %s with pid %s for chunk %s', M
+CE->wid, MCE->pid, $chunk_id;
    for ( @{ $chunk_ref } ) {
        $hash->{ sprintf '%.2d %s', $_, $$ } = time;
        say "After $_: " . Dumper $hash->export;
        sleep 2;
    }
} ( 0 .. 12 );

MCE::Loop->finish;

say "Parent is ready to dump";
say 'Dumping: ' . Dumper $hash->export;
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