CRIU dump error on mpv: ctty inheritance detected, no PTY peer with sid/pgrp needed

[yamabiiko]

Description and error I dumped a mpv process with no video and specifying external sockets and ran into Error (criu/tty.c:2281): tty: ctty inheritance detected sid/pgrp 370774, no PTY peer with sid/pgrp needed

370774 is the PID of the bash process I executed mpv from

Steps to reproduce the issue:

1. Run mpv --video=no video.mp4 on a different terminal window
2. criu dump -D restore/ -t $(pgrep mpv) --shell-job --ext-unix-sk --external unix[#id_pulseaudio_stream] -v4 -o dump.log

CRIU logs and information:

CRIU full dump/restore logs:

dump.log

Output of `criu --version`:

Version: 3.18
GitID: v3.18-266-g6f92787b7

Output of `criu check --all`:

Looks good.