[Bug 1881217] Re: arm64v8 focal: lintian will get stuck with it

[Robert C Jennings]

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

** Attachment added: "lintian debug output"
   https://bugs.launchpad.net/cloud-images/+bug/1881217/+attachment/5379498/+files/lintian.output

** Also affects: lintian (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1881217

Title:
  arm64v8 focal: lintian will get stuck with it

Status in cloud-images:
  Invalid
Status in lintian package in Ubuntu:
  New

Bug description:
  = Problem

  On arm64v8 focal, lintian which is launched by debuild seems get stuck
  with it.

  = Expected

  debuild succeeds without stalling.

  = How to reproduce

  ## lintian hang without debuild
  (On Ubuntu Server Focal 20.04 amd64)
  # sudo apt update
  # sudo apt full-upgrade -y
  #  sudo apt install qemu-user-static qemu-system-arm binfmt-support docker.io -y
  # sudo docker run -it arm64v8/ubuntu:focal /bin/bash
  (In the docker container)
  # apt update
  # apt install -y lintian
  # lintian --help

  ## Original reproducer steps
  # docker run -it arm64v8/ubuntu:focal /bin/bash
  # sed -i 's/^# deb-src/deb-src/g' /etc/apt/sources.list
  # apt update
  # apt install -y devscripts debhelper-compat
  # apt source hello
  # cd hello-2.10
  # debuild -uc -us -nc

  = Actual

  lintian will not finish at all.

  ...
    dh_builddeb
  dpkg-deb: building package 'hello' in '../hello_2.10-2ubuntu2_arm64.deb'.
  dpkg-deb: building package 'hello-dbgsym' in 'debian/.debhelper/scratch-space/build-hello/hello-dbgsym_2.10-2ubuntu2_arm64.deb'.
   Renaming hello-dbgsym_2.10-2ubuntu2_arm64.deb to hello-dbgsym_2.10-2ubuntu2_arm64.ddeb
   dpkg-genbuildinfo --build=binary
   dpkg-genchanges --build=binary >../hello_2.10-2ubuntu2_arm64.changes
  dpkg-genchanges: info: binary-only upload (no source code included)
   dpkg-source --after-build .
  dpkg-buildpackage: info: binary-only upload (no source included)
  Now running lintian hello_2.10-2ubuntu2_arm64.changes ...

  # Additional Information

  This issue affects only arm64v8:focal not ubuntu:focal.

  It seems that lintian --help doesn't work too. So I guess something
  broken.

  # lintian --help
  (NO OUTPUT AT ALL!)

  # dpkg -l | grep lintian
  ii  lintian                          2.62.0                            all          Debian package checker

  # ls -la /usr/bin/lintian
  lrwxrwxrwx 1 root root 32 Apr  3 01:02 /usr/bin/lintian -> ../share/lintian/frontend/dplint
  # ls -la /usr/share/lintian/frontend/dplint
  -rwxr-xr-x 1 root root 11283 Apr  3 01:02 /usr/share/lintian/frontend/dplint

  # /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

  dplint doesn't stall.

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