ubuntu focal arm64: rake build stalls because of lintian about fluent-package-builder HOT 16 CLOSED

use v5.20;
use warnings;
use utf8;
use autodie;

use IO::Async::Loop;
use IO::Async::Process;

my $loop = IO::Async::Loop->new;
my $future = $loop->new_future;
my $status;

my @command = ("nproc");
print $future;

$loop->run_child(
    command => [@command],
    on_finish => sub {
	my ($pid, $exitcode, $stdout, $stderr) = @_;
	$status = ($exitcode >> 8);

	if ($status) {
	    my $message = "Command @command exited with status $status";
	    $message .= ": $stderr" if length $stderr;
	    $future->fail($message);
	    return;
	}

	$future->done($stdout);
    });

$loop->await($future);

root@f1123001d735:~# dpkg -l | grep lintian
ii  lintian                          2.76.0                         all          Debian package checker

file /usr/bin/lintian
/usr/bin/lintian: symbolic link to ../share/lintian/frontend/dplint
root@f1123001d735:~# file ../share/lintian/frontend/dplint
../share/lintian/frontend/dplint: cannot open `../share/lintian/frontend/dplint' (No such file or directory)

% file /usr/share/lintian/frontend/dplint
/usr/share/lintian/frontend/dplint: Perl script text executable

# file /usr/bin/lintian
/usr/bin/lintian: symbolic link to ../share/lintian/frontend/dplint
root@58022cde8896:/# file /usr/share/lintian/frontend/dplint 
/usr/share/lintian/frontend/dplint: Perl script text executable

# /usr/share/lintian/frontend/dplint --print-version
2.62.0
root@58022cde8896:/# /usr/share/lintian/frontend/dplint --help         
Lintian v2.62.0
Usage: dplint [General options] <command> [options/arguments...]
General options:
  --include-dir DIR     include checks, libraries (etc.) from DIR
  --[no-]user-dirs      whether to use files from user directories

root@58022cde8896:/# lintian --print-version
^C
root@58022cde8896:/# lintian --version
^C
root@58022cde8896:/# lintian --help   
^C
root@58022cde8896:/# lintian -v    
^C
root@58022cde8896:/# lintian -h
^C

120:	            $TOOL_RUNNER->($tool_pm_path);
  DB<2> p $tool_pm_path 
/usr/share/lintian/commands/lintian.pm
  DB<3> n
^CIO::Async::Loop::Epoll::loop_once(/usr/share/perl5/IO/Async/Loop/Epoll.pm:181):
181:	   return undef if !defined $ret and $! != EINTR;
  DB<3> p $TOOL_RUNNER

# file /usr/share/lintian/commands/lintian.pm 
/usr/share/lintian/commands/lintian.pm: Perl script text executable

root@0104ff753c95:/# perl epoll.pl 
$VAR1 = bless( {
                 'ready' => 0,
                 'loop' => bless( {
                                    'timequeue' => undef,
                                    'sigattaches' => {},
                                    'masks' => {},
                                    'threadwatches' => {},
                                    'sigmask' => bless( do{\(my $o = '')}, 'POSIX::SigSet' ),
                                    'refaddr_for_fileno' => {},
                                    'epoll' => bless( \*Linux::Epoll::_GEN_0, 'Linux::Epoll' ),
                                    'fakeevents' => {},
                                    'signals' => {},
                                    'iowatches' => {},
                                    'pid' => 42102,
                                    'deferrals' => [],
                                    'old_timer' => '',
                                    'notifiers' => {},
                                    'childwatches' => {},
                                    'os' => {},
                                    'maxevents' => 8,
                                    'childmanager' => undef
                                  }, 'IO::Async::Loop::Epoll' ),
                 'callbacks' => []
               }, 'IO::Async::Future' );