Ubuntu 18.04 - Bad Kernel Update

Discussion in 'News and Announcements' started by md_5, Jan 30, 2019.

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  1. md_5

    Administrator Developer

    All,

    This is a message to let you know that Ubuntu has recently pushed what appears to be a bad kernel update to Ubuntu 18.04 users.

    If you are using Ubuntu 18.04, please note that the following kernel appears to have issues handling console input:
    4.15.0-44-generic #47-Ubuntu SMP Mon Jan 14 11:26:59 UTC 2019.

    Older (e.g. 4.15.0-43-generic #46-Ubuntu SMP Thu Dec 6 14:45:28 UTC 2018) kernels are not affected.

    If you are using this kernel and have a message along the lines of "java.io.IOException: Resource temporarily unavailable", this is the reason.

    We are still investigating the exact cause / reason for this.

    If you are affected by this issue there are a number of workarounds available (you only need to use one).
    1. Spigot / BungeeCord: Add -Djline.terminal=jline.UnsupportedTerminal to your Java arguments
    2. Spigot: Add --nojline to your Spigot arguments
    3. Reboot your server and select 4.15.0-43, or any other non broken Linux kernel.
    4. Install a non broken kernel: apt install linux-image-4.15.0-43-generic, remove the broken one: apt remove linux-image-4.15.0-44-generic, and reboot.
    Please direct any queries to the 1.13.2 discussion thread, or general forums:
    https://www.spigotmc.org/threads/344189/

    EDIT: Please see the below post for updates.
     
    #1 md_5, Jan 30, 2019
    Last edited: Jan 30, 2019
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  2. md_5

    Administrator Developer

    After lots of debugging and some brief discussion on the LKML, it appears that this is the result of a bug introduced into Linux on 1 November 2018, and fixed on 9 January 2019. All Linux kernels from the first date onwards have the potential to be affected.

    In this case, Ubuntu applied the 1 November patch which introduced the issue, but has not yet applied the 9 January patch which ostensibly fixes the issue.

    I will be working with Ubuntu to make sure that this is done, but the issue is likely to persist for weeks.
     
    #2 md_5, Jan 30, 2019
    Last edited: Jan 30, 2019
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  3. md_5

    Administrator Developer

    FYI the Ubuntu kernel team has recognised the regression as high priority, and it will be fixed in the next release. This isn’t likely to be for a few weeks however.
     
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  4. md_5

    Administrator Developer

    The fix has been committed to the Ubuntu code repositories, but is not yet available as a prebuilt package.
     
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  5. md_5

    Administrator Developer

    The fix should have now made it to Ubuntu 18.10 (which you shouldn't really be using on a server....).
    Ubuntu 18.04 is still waiting.
     
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