Fan control service issues - service will not start "Uncaught DBus service lookup failure exception"

[Stephen Boylan]

Hello all,

I've run into an issue with my fan control. I have a simple two fan system which is failing to start phosphor-fan-control at .service<mailto:phosphor-fan-control at .service>

This is the status
root at evb-ast2500:/lib/systemd/system# systemctl status phosphor-fan-control at 0.service --no-page
? phosphor-fan-control at 0.service - Phosphor Fan Control Daemon
   Loaded: loaded (/lib/systemd/system/phosphor-fan-control at .service; static; vendor preset: enabled)
   Active: failed (Result: exit-code) since Wed 2019-04-24 16:22:36 UTC; 16s ago
  Process: 1218 ExecStart=/usr/bin/env phosphor-fan-control --control (code=exited, status=1/FAILURE)
Main PID: 1218 (code=exited, status=1/FAILURE)

Apr 24 16:22:36 evb-ast2500 systemd[1]: phosphor-fan-control at 0.service: Service RestartSec=1s expired, scheduling restart.
Apr 24 16:22:36 evb-ast2500 systemd[1]: phosphor-fan-control at 0.service: Scheduled restart job, restart counter is at 2.
Apr 24 16:22:36 evb-ast2500 systemd[1]: Stopped Phosphor Fan Control Daemon.
Apr 24 16:22:36 evb-ast2500 systemd[1]: phosphor-fan-control at 0.service: Start request repeated too quickly.
Apr 24 16:22:36 evb-ast2500 systemd[1]: phosphor-fan-control at 0.service: Failed with result 'exit-code'.
Apr 24 16:22:36 evb-ast2500 systemd[1]: Failed to start Phosphor Fan Control Daemon.

And I noticed this in the journalctl
{
        "__CURSOR" : "s=efc0b033c5f243798b56446bcaffc0f5;i=23d;b=2de3ccbcea7940f5b51652e55e900cd2;m=2f22198c;t=5874871dec1c2;x=f1ba902c2ec1feae",
        "__REALTIME_TIMESTAMP" : "1556120101372354",
        "__MONOTONIC_TIMESTAMP" : "790763916",
        "_BOOT_ID" : "2de3ccbcea7940f5b51652e55e900cd2",
        "_UID" : "0",
        "_GID" : "0",
        "_MACHINE_ID" : "4c5bf4049b5e4751b70a17eaeeb55a49",
        "_HOSTNAME" : "evb-ast2500",
        "_TRANSPORT" : "journal",
        "_CAP_EFFECTIVE" : "3fffffffff",
        "CODE_FILE" : "/home/ircadmin/OpenBMC/openbmc/build/tmp/work/armv6-openbmc-linux-gnueabi/phosphor-fan/1.0+gitAUTOINC+4b258ac8b6-r1/recipe-sysroot/usr
/include/phosphor-logging/log.hpp",
        "CODE_LINE" : "105",
        "CODE_FUNC" : "helper_log",
        "PRIORITY" : "3",
        "MESSAGE" : "Uncaught DBus service lookup failure exception",
        "TRANSACTION_ID" : "114915536",
        "PATH" : "/xyz/openbmc_project/sensors/fan_tach/fan0",
        "INTERFACE" : "xyz.openbmc_project.Control.FanPwm",
        "SYSLOG_IDENTIFIER" : "phosphor-fan-control",
        "_PID" : "1273",
        "_COMM" : "phosphor-fan-co",
        "_EXE" : "/usr/sbin/phosphor-fan-control",
        "_CMDLINE" : "phosphor-fan-control --control",
        "_SYSTEMD_CGROUP" : "/system.slice/system-phosphor\\x2dfan\\x2dcontrol.slice/phosphor-fan-control at 0.service",
        "_SYSTEMD_UNIT" : "phosphor-fan-control at 0.service",
        "_SYSTEMD_SLICE" : "system-phosphor\\x2dfan\\x2dcontrol.slice",
        "_SYSTEMD_INVOCATION_ID" : "21572a9f879c44cab2b9b6b4c5e9a504",
        "_SOURCE_REALTIME_TIMESTAMP" : "1556120101372269"
}

I know the PATH exists, though I'm not entirely sure about the INTERFACE. I've checked systemctl to see if I can find it and I don't see it. Should I be checking elsewhere for it?


I can see my fan_tach sensors and my chassis entries as such
/xyz/openbmc_project/sensors/fan_tach/enumerate

{

    "data": {

        "/xyz/openbmc_project/sensors/fan_tach/fan0": {

            "CriticalAlarmHigh": false,

            "CriticalAlarmLow": false,

            "CriticalHigh": 5500,

            "CriticalLow": 1000,

            "MaxValue": 0,

            "MinValue": 0,

            "Scale": 0,

            "Unit": "xyz.openbmc_project.Sensor.Value.Unit.RPMS",

            "Value": 4292,

            "WarningAlarmHigh": false,

            "WarningAlarmLow": false,

            "WarningHigh": 5000,

            "WarningLow": 1500

        },

        "/xyz/openbmc_project/sensors/fan_tach/fan1": {

            "CriticalAlarmHigh": false,

            "CriticalAlarmLow": false,

            "CriticalHigh": 5500,

            "CriticalLow": 1000,

            "MaxValue": 0,

            "MinValue": 0,

            "Scale": 0,

            "Target": 255,

            "Unit": "xyz.openbmc_project.Sensor.Value.Unit.RPMS",

            "Value": 3551,

            "WarningAlarmHigh": false,

            "WarningAlarmLow": false,

            "WarningHigh": 5000,

            "WarningLow": 1500

        }

    },

    "message": "200 OK",

    "status": "ok"

}


/xyz/openbmc_project/inventory/system/chassis/motherboard/enumerate
{
    "data": {
        "/xyz/openbmc_project/inventory/system/chassis/motherboard/fan0": {
            "Functional": true,
            "Present": true,
           "PrettyName": "fan0"
        },
        "/xyz/openbmc_project/inventory/system/chassis/motherboard/fan0/fan0": {
            "Functional": true
        },
        "/xyz/openbmc_project/inventory/system/chassis/motherboard/fan1": {
            "Functional": true,
            "Present": true,
            "PrettyName": "fan1"
        },
        "/xyz/openbmc_project/inventory/system/chassis/motherboard/fan1/fan1": {
            "Functional": true
        }
    },
    "message": "200 OK",
    "status": "ok"
}

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