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Thread: Server freezes without error logs

  1. #1
    Join Date
    Nov 2011
    Beans
    21

    Server freezes without error logs

    Hi all,

    I am running ubuntu server with kernel 4.15.0-142-generic on a HP Elite 800 G4. There are 10 USB Bluetooth dongles connected via a HUB and I am running software that connects to Bluetooth devices. Every once in a while the server freezes, there is no output on the screen, no response to the keyboard and no network connectivity. When the server is restarted, journalctl -b -1 does not show anything out of the ordinary other than the logs just stopping. I would suspect the hardware but there is another server that behaves exactly the same. This only started to happen once I installed a clean OS. I have used different kernel versions including 5.xx. I ran a script that logs the temperature and memory consumption every minute and there was nothing out of the ordinary when the logs stopped.

    Help will be much appreciated.

  2. #2
    Join Date
    Oct 2017
    Location
    City of Waterfalls-Ph
    Beans
    Hidden!
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: Server freezes without error logs

    There are a lot of possible causes of this freeze
    Is the machine new? If the machine is not new maybe the dusty machine can cause it to freeze due to the heat sink can't performed well during the
    processors turns very hot due to the dusty build ups from the heat sink.
    If the machine is new then other says that if "Kernel hangs" are very difficult to debug as no message is displayed on screen as in case of crash.
    And if you are really lucky you will see something inside
    /var/log/messages
    as during hang your entire system hangs along with syslog daemon and nothing will be write inside these files.
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    From: mike_08

  3. #3
    Join Date
    Nov 2011
    Beans
    21

    Re: Server freezes without error logs

    Thanks for the reply. It is probably not a temperature issue. The sensors did not indicate any abnormal temperature and the issue began right after re-installation of the OS.

  4. #4
    Join Date
    Oct 2017
    Location
    City of Waterfalls-Ph
    Beans
    Hidden!
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: Server freezes without error logs

    Did you try to check your memory
    check dmidecode
    Code:
    sudo dmidecode --type memory
    and also try to check running applications
    This is some basic on checking Linux server or
    this maybe some compatibility issue to your hardware.
    hardware compatibility is a rare issue it might be
    to your machine running applications.
    Code:
    sudo ps -ef | grep apache2
    Code:
    sudo netstat -plunt | grep apache2
    corn ubuntuforums community.
    Open Source platform where the real world of human is here. Click here for Solve thread
    Rock n' Roll People.
    From: mike_08

  5. #5
    Join Date
    Nov 2011
    Beans
    21

    Re: Server freezes without error logs

    Apache is not running and there doesn't seem to be anything out of the ordinary with the memory:

    Code:
    Getting SMBIOS data from sysfs.
    SMBIOS 3.1 present.
    
    Handle 0x0007, DMI type 16, 23 bytes
    Physical Memory Array
        Location: System Board Or Motherboard
        Use: System Memory
        Error Correction Type: None
        Maximum Capacity: 32 GB
        Error Information Handle: Not Provided
        Number Of Devices: 2
    
    Handle 0x0039, DMI type 17, 40 bytes
    Memory Device
        Array Handle: 0x0007
        Error Information Handle: Not Provided
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 4096 MB
        Form Factor: SODIMM
        Set: None
        Locator: DIMM1
        Bank Locator: ChannelB
        Type: DDR4
        Type Detail: Synchronous
        Speed: 2667 MT/s
        Manufacturer: Micron
        Serial Number: 1F4F8C01
        Asset Tag:  
        Part Number: 4ATF51264HZ-2G6E1   
        Rank: 1
        Configured Clock Speed: 2667 MT/s
        Minimum Voltage: Unknown
        Maximum Voltage: Unknown
        Configured Voltage: 1.2 V
    
    Handle 0x000A, DMI type 17, 40 bytes
    Memory Device
        Array Handle: 0x0007
        Error Information Handle: Not Provided
        Total Width: Unknown
        Data Width: Unknown
        Size: No Module Installed
        Form Factor: Other
        Set: None
        Locator: DIMM3
        Bank Locator: ChannelA
        Type: Unknown
        Type Detail: None
        Speed: Unknown
        Manufacturer: Not Specified
        Serial Number: Not Specified
        Asset Tag: Not Specified
        Part Number: Not Specified
        Rank: Unknown
        Configured Clock Speed: Unknown
        Minimum Voltage: Unknown
        Maximum Voltage: Unknown
        Configured Voltage: Unknown

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