[Bug 1731502] Re: nmbd starts fine with no interfaces, but doesn't notify systemd that it started

[Robie Basak]

** Tags added: triage

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Title:
  nmbd starts fine with no interfaces, but doesn't notify systemd that
  it started

Status in samba:
  Unknown
Status in samba package in Ubuntu:
  Triaged

Bug description:
  nmbd seems to start fine when there are no non-loopback interfaces up,
  and will loop indefinitely:

          /* We only count IPv4, non-loopback interfaces here. */
          while (iface_count_v4_nl() == 0) {
              sleep(5);
              load_interfaces();
          }

  It can happen that during boot there is really no interface available,
  because, for example, it's a desktop connected via wifi and the
  wireless connection is only established after the user logs in.

  nmbd will happily start up and wait for an interface, but systemd is expecting a notification because the Type is set to notify:
  $ cat packaging/systemd/nmb.service 
  [Unit]
  Description=Samba NMB Daemon
  After=syslog.target network.target

  [Service]
  Type=notify
  (...)

  So after about 1m30s without a notification from nmbd, systemd will
  just kill it:

  Oct 30 14:25:51 artful-samba-init systemd[1]: nmbd.service: Supervising process 171 which is not our child. We'll most likely not notice when it exits.
  ...
  Oct 30 14:27:21 artful-samba-init systemd[1]: nmbd.service: Start operation timed out. Terminating.
  Oct 30 14:27:21 artful-samba-init systemd[1]: nmbd.service: Killing process 171 (nmbd) with signal SIGKILL.
  Oct 30 14:27:21 artful-samba-init systemd[1]: nmbd.service: Killing process 171 (nmbd) with signal SIGKILL.
  Oct 30 14:27:21 artful-samba-init systemd[1]: Failed to start Samba NMB Daemon.
  Oct 30 14:27:21 artful-samba-init systemd[1]: nmbd.service: Unit entered failed state.
  Oct 30 14:27:21 artful-samba-init systemd[1]: nmbd.service: Failed with result 'timeout'.

  
  --- Original description ---

  ProblemType: Package
  DistroRelease: Ubuntu Kylin 17.10
  Package: samba 2:4.6.7+dfsg-1ubuntu3 [origin: Ubuntu]
  ProcVersionSignature: Ubuntu 4.13.0-17.20-lowlatency 4.13.8
  Uname: Linux 4.13.0-17-lowlatency x86_64
  ApportVersion: 2.20.7-0ubuntu3.2
  Architecture: amd64
  Date: Fri Nov 10 09:51:44 2017
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  InstallationDate: Installed on 2017-10-19 (22 days ago)
  InstallationMedia: Ubuntu-Studio 17.04 "Zesty Zapus" - Release amd64 (20170412)
  Python3Details: /usr/bin/python3.6, Python 3.6.3, python3-minimal, 3.6.3-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.14, python-minimal, 2.7.14-2ubuntu1
  RelatedPackageVersions:
   nautilus 1:3.26.0-0ubuntu1
   gvfs     1.34.1-1ubuntu1
  SambaClientRegression: No
  SourcePackage: samba
  Title: package samba 2:4.6.7+dfsg-1ubuntu3 [origin: Ubuntu] failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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