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status: leaves behind zombie (i.e. <defunct>) processes

See original GitHub issue

Description

I happened to run ps -e and noticed hundreds of process with command dvc <defunct>. I was able to reproduce in a clean shell with dvc status, with each call to dvc status leaving behind two zombies.

Reproduce

(HdEqokMk-py3.8) root@32381816d00a# ps -e
    PID TTY          TIME CMD
      1 ?        00:00:04 jupyter-lab
     54 pts/0    00:00:01 bash
     59 pts/0    00:00:00 poetry
     62 pts/1    00:00:01 bash
     69 pts/1    00:00:00 ps
(HdEqokMk-py3.8) root@32381816d00a# dvc status
WARNING: stage: 'data.dvc' is frozen. Its dependencies are not going to be shown in the status output.
discover@0:                                                                                                      
        changed deps:
                modified:           abcd
transform:
        changed deps:
                modified:           pyproject.toml
                modified:           abcd
                modified:           vendor
                modified:           data/schema.xlsx
        changed outs:
                modified:           build/datapackage.json
                modified:           build/abcd.csv
(HdEqokMk-py3.8) root@32381816d00a# ps -e
    PID TTY          TIME CMD
      1 ?        00:00:04 jupyter-lab
     54 pts/0    00:00:01 bash
     59 pts/0    00:00:00 poetry
     62 pts/1    00:00:01 bash
     78 ?        00:00:00 dvc <defunct>
     79 ?        00:00:00 dvc <defunct>
     82 pts/1    00:00:00 ps

Expected

No dvc <defunct> processes.

Environment information

I cannot reproduce this on macOS. I encountered this working out of a rootless docker container.

Output of dvc doctor:

DVC version: 2.7.4 (pip)
---------------------------------
Platform: Python 3.8.10 on Linux-5.11.0-27-generic-x86_64-with-glibc2.29
Supports:
        gdrive (pydrive2 = 1.10.0),
        http (aiohttp = 3.7.4.post0, aiohttp-retry = 2.4.5),
        https (aiohttp = 3.7.4.post0, aiohttp-retry = 2.4.5)
Cache types: symlink
Cache directory: fuse.glusterfs on glusteruser.domain.pub:/glusteruser
Caches: local
Remotes: gdrive, local, local
Workspace directory: ext4 on /dev/sda5
Repo: dvc, git