Conmon processes left behind when using a podman service url

[fgiorgetti]

Issue Description

I noticed that when I am using a podman endpoint (through --url), then I execute a command against a running container, podman --url <url> exec ... two conmon processes are left and exit after exit_command_delay has been elapsed.

If --url is not used, there is no conmon process left.

Steps to reproduce the issue

Steps to reproduce the issue:

$ id -u
1000
$ systemctl --user enable --now podman.socket
$ podman --url unix:///run/user/1000/podman/podman.sock run -itd --name bb busybox
$ pgrep -fa conmon | wc -l
1
$ podman --url unix:///run/user/1000/podman/podman.sock exec bb ls
$ pgrep -fa conmon | wc -l
3
$ podman --url unix:///run/user/1000/podman/podman.sock exec bb ls
$ pgrep -fa conmon | wc -l
5

Describe the results you received

Every execution of a command using --url leaves two extra conmon processes running.

Describe the results you expected

No conmon processes, related to the execution, left running.

podman info output

host:
  arch: amd64
  buildahVersion: 1.32.0
  cgroupControllers:
  - cpu
  - memory
  - pids
  cgroupManager: systemd
  cgroupVersion: v2
  conmon:
    package: conmon-2.1.7-2.fc38.x86_64
    path: /usr/bin/conmon
    version: 'conmon version 2.1.7, commit: '
  cpuUtilization:
    idlePercent: 99.8
    systemPercent: 0.13
    userPercent: 0.07
  cpus: 4
  databaseBackend: boltdb
  distribution:
    distribution: fedora
    variant: server
    version: "38"
  eventLogger: journald
  freeLocks: 2047
  hostname: localhost.localdomain
  idMappings:
    gidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 524288
      size: 65536
    uidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 524288
      size: 65536
  kernel: 6.2.9-300.fc38.x86_64
  linkmode: dynamic
  logDriver: journald
  memFree: 3578187776
  memTotal: 4090916864
  networkBackend: netavark
  networkBackendInfo:
    backend: netavark
    dns:
      package: aardvark-dns-1.8.0-1.fc38.x86_64
      path: /usr/libexec/podman/aardvark-dns
      version: aardvark-dns 1.8.0
    package: netavark-1.8.0-2.fc38.x86_64
    path: /usr/libexec/podman/netavark
    version: netavark 1.8.0
  ociRuntime:
    name: crun
    package: crun-1.9.2-1.fc38.x86_64
    path: /usr/bin/crun
    version: |-
      crun version 1.9.2
      commit: 35274d346d2e9ffeacb22cc11590b0266a23d634
      rundir: /run/user/1000/crun
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +LIBKRUN +WASM:wasmedge +YAJL
  os: linux
  pasta:
    executable: /usr/bin/pasta
    package: passt-0^20231004.gf851084-1.fc38.x86_64
    version: |
      pasta 0^20231004.gf851084-1.fc38.x86_64
      Copyright Red Hat
      GNU General Public License, version 2 or later
        <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
      This is free software: you are free to change and redistribute it.
      There is NO WARRANTY, to the extent permitted by law.
  remoteSocket:
    exists: true
    path: /run/user/1000/podman/podman.sock
  security:
    apparmorEnabled: false
    capabilities: CAP_CHOWN,CAP_DAC_OVERRIDE,CAP_FOWNER,CAP_FSETID,CAP_KILL,CAP_NET_BIND_SERVICE,CAP_SETFCAP,CAP_SETGID,CAP_SETPCAP,CAP_SETUID,CAP_SYS_CHROOT
    rootless: true
    seccompEnabled: true
    seccompProfilePath: /usr/share/containers/seccomp.json
    selinuxEnabled: true
  serviceIsRemote: false
  slirp4netns:
    executable: /usr/bin/slirp4netns
    package: slirp4netns-1.2.1-1.fc38.x86_64
    version: |-
      slirp4netns version 1.2.1
      commit: 09e31e92fa3d2a1d3ca261adaeb012c8d75a8194
      libslirp: 4.7.0
      SLIRP_CONFIG_VERSION_MAX: 4
      libseccomp: 2.5.3
  swapFree: 4090490880
  swapTotal: 4090490880
  uptime: 0h 35m 55.00s
plugins:
  authorization: null
  log:
  - k8s-file
  - none
  - passthrough
  - journald
  network:
  - bridge
  - macvlan
  - ipvlan
  volume:
  - local
registries:
  search:
  - registry.fedoraproject.org
  - registry.access.redhat.com
  - docker.io
  - quay.io
store:
  configFile: /home/fgiorget/.config/containers/storage.conf
  containerStore:
    number: 1
    paused: 0
    running: 1
    stopped: 0
  graphDriverName: overlay
  graphOptions: {}
  graphRoot: /home/fgiorget/.local/share/containers/storage
  graphRootAllocated: 6371147776
  graphRootUsed: 1979437056
  graphStatus:
    Backing Filesystem: xfs
    Native Overlay Diff: "true"
    Supports d_type: "true"
    Supports shifting: "false"
    Supports volatile: "true"
    Using metacopy: "false"
  imageCopyTmpDir: /var/tmp
  imageStore:
    number: 1
  runRoot: /run/user/1000/containers
  transientStore: false
  volumePath: /home/fgiorget/.local/share/containers/storage/volumes
version:
  APIVersion: 4.7.0
  Built: 1695839078
  BuiltTime: Wed Sep 27 18:24:38 2023
  GitCommit: ""
  GoVersion: go1.20.8
  Os: linux
  OsArch: linux/amd64
  Version: 4.7.0

Podman in a container

No

Privileged Or Rootless

Rootless

Upstream Latest Release

No

Additional environment details

Fedora 38 Server (qcow2 image / kvm)

Additional information

No response

[edsantiago]

You will find that those conmon processes include the command-line option --exit-delay 300. You will also find that they vanish after five minutes. It's something to do with having to linger around for cleanup, I think....

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