[systemd-bugs] [Bug 72816] New: Interaction between systemd and systemd-logind fails during reloads with many units

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72816

          Priority: medium
            Bug ID: 72816
          Assignee: systemd-bugs at lists.freedesktop.org
           Summary: Interaction between systemd and systemd-logind fails
                    during reloads with many units
        QA Contact: systemd-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: david at davidstrauss.net
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: general
           Product: systemd

systemd sends DBus messages for every unit added and removed, which is all of
them for reloads. This is on v208 with the Fedora 20 patches, but it looks like
the same occurs in master.

systemd-logind can't keep up with these:

Dec 17 23:07:02 519149-11pod01 dbus[1636]: [system] Rejected: destination has a
full message queue, 0 matched rules; type="signal", sender=":1.55216" (uid=0
pid=1 comm="/usr/lib/systemd/systemd --system --deserialize 26")
interface="org.freedesktop.systemd1.Manager" member="UnitRemoved" error
name="(unset)" requested_reply="0" destination="org.freedesktop.DBus" (uid=0
pid=32361 comm="/usr/lib/systemd/systemd-logind ")
Dec 17 23:07:02 519149-11pod01 dbus[1636]: [system] Rejected: destination has a
full message queue, 0 matched rules; type="signal", sender=":1.55216" (uid=0
pid=1 comm="/usr/lib/systemd/systemd --system --deserialize 26")
interface="org.freedesktop.systemd1.Manager" member="UnitRemoved" error
name="(unset)" requested_reply="0" destination="org.freedesktop.DBus" (uid=0
pid=32361 comm="/usr/lib/systemd/systemd-logind ")

Here's what it looks like from dbus-monitor --system:

signal sender=:1.55216 -> dest=(null destination) serial=24348
path=/org/freedesktop/systemd1; interface=org.freedesktop.systemd1.Manager;
member=UnitRemoved
   string "nginx_c4d9e5763f294ca19d6abf242a2575cc.socket"
   object path
"/org/freedesktop/systemd1/unit/nginx_5fc4d9e5763f294ca19d6abf242a2575cc_2esocket"
signal sender=:1.55216 -> dest=(null destination) serial=24349
path=/org/freedesktop/systemd1; interface=org.freedesktop.systemd1.Manager;
member=UnitRemoved
   string "nginx_add76a5f40704da0832bb6065de7f342.socket"
   object path
"/org/freedesktop/systemd1/unit/nginx_5fadd76a5f40704da0832bb6065de7f342_2esocket"
signal sender=:1.55216 -> dest=(null destination) serial=24350
path=/org/freedesktop/systemd1; interface=org.freedesktop.systemd1.Manager;
member=UnitRemoved

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