[systemd-bugs] [Bug 56203] New: Race condition for service dependent on mount

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=56203

          Priority: medium
            Bug ID: 56203
          Assignee: systemd-bugs at lists.freedesktop.org
           Summary: Race condition for service dependent on mount
        QA Contact: systemd-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: david at davidstrauss.net
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: general
           Product: systemd

If a service depends on a mount, systemd doesn't properly wait for the mount to
complete before starting the service. This creates race conditions where the
service may write to the mount directory before the mount is active, which can
stop the mount from even completing successfully because the mount directory
isn't empty. We might be able to stop the writes through permissions on the
mount directory, but the writes would still fail.

The cleanest solution to this seems to be "notify" integration into the mount
utility so it tells systemd that the mount is complete or waiting for the mount
request to complete in some other way.

Part of why we use this dependency is to perform the mount before "forking" the
file system namespace for the dependent service. This allows the dependent
service file system namespace to not propagate further mounts from the main
file system.

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