Comment 4 for bug 1881217

I added a -d flag to the invocation of perl in the shebang line of /usr/share/lintian/frontend/dplint Here is what I got:

# lintian --help

Loading DB routines from perl5db.pl version 1.55
Editor support available.

Enter h or 'h h' for help, or 'man perldebug' for more help.

main::(/usr/bin/lintian:55): };
  DB<1> c
^CIO::Async::Loop::Epoll::loop_once(/usr/share/perl5/IO/Async/Loop/Epoll.pm:181):
181: return undef if !defined $ret and $! != EINTR;
  DB<1> T
@ = DB::DB called from file '/usr/share/perl5/IO/Async/Loop/Epoll.pm' line 181
. = IO::Async::Loop::Epoll::loop_once(ref(IO::Async::Loop::Epoll)) called from file '/usr/share/perl5/IO/Async/Loop.pm' line 642
. = IO::Async::Loop::await(ref(IO::Async::Loop::Epoll), ref(IO::Async::Future)) called from file '/usr/share/perl5/Lintian/Util.pm' line 691
$ = Lintian::Util::safe_qx('nproc') called from file '/usr/share/perl5/Lintian/Internal/FrontendUtil.pm' line 123
@ = Lintian::Internal::FrontendUtil::default_parallel() called from file '/usr/share/lintian/commands/lintian.pm' line 82
$ = require '/usr/share/lintian/commands/lintian.pm' called from file '/usr/bin/lintian' line 36
. = eval {...} called from file '/usr/bin/lintian' line 36
. = main::__ANON__[/usr/bin/lintian:55]('/usr/share/lintian/commands/lintian.pm') called from file '/usr/bin/lintian' line 120
. = dplint::run_tool('/usr/bin/lintian', 'lintian') called from file '/usr/bin/lintian' line 299
. = dplint::main() called from file '/usr/bin/lintian' line 383

I also ran with tracing and that's attached here as