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cPhulkd causing soft lockup

Discussion in 'General Discussion' started by dstana, May 30, 2018.

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  1. dstana

    dstana Well-Known Member

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    cPhulkd seems to be the culprit in an issue that's locking up the server. From our logs:

    Code:
    kernel: NMI watchdog: BUG: soft lockup - CPU#5 stuck for 22s! [cPhulkd - proce:4599]
    After a reboot, it's back again:

    Code:
    kernel: NMI watchdog: BUG: soft lockup - CPU#4 stuck for 22s! [cPhulkd - proce:5572]

    Server is running WHM version 70.0.46 with Centos 7.5.1804 (Kernel 3.10.0-862.3.2.el7.x86_64). I've added just a single line of each of the errors, but they go and go until the server is rebooted before starting again.
     
    #1 dstana, May 30, 2018
    Last edited: May 30, 2018
  2. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello @dstana,

    Can you let us know the OS, kernel, and cPanel versions installed on the affected system? EX:

    Code:
    cat /etc/redhat-release
    uname -r
    cat /usr/local/cpanel/version
    Thank you.
     
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  3. dstana

    dstana Well-Known Member

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    I edited my post to include that.
     
  4. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello @dstana,

    I don't see anything suggesting this relates to a bug with cPanel & WHM or the cPHulk Brute Force Protection feature. Could you open a support ticket so we can take a closer look at the affected system and rule out any issues with cPanel & WHM?

    Thank you.
     
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  5. dstana

    dstana Well-Known Member

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    Ticket opened.
     
  6. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello,

    To update, it looks like this was the result of a DDOS attack on the server. The advice in the support ticket was to reach out to the hosting provider or data center to see if it can be mitigated from the network level.

    Thank you.
     
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