cPhulkd causing soft lockup

dstana

• May 30, 2018 11:21

cPhulkd seems to be the culprit in an issue that's locking up the server. From our logs: kernel: NMI watchdog: BUG: soft lockup - CPU#5 stuck for 22s! [cPhulkd - proce:4599]
After a reboot, it's back again: 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.

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  cPanelMichael

  • May 30, 2018 16:44

  Hello @dstana, Can you let us know the OS, kernel, and cPanel versions installed on the affected system? EX: cat /etc/redhat-release uname -r cat /usr/local/cpanel/version
  Thank you.

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  dstana

  • May 30, 2018 16:51

  I edited my post to include that.

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  cPanelMichael

  • May 30, 2018 16:58

  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

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  dstana

  • May 30, 2018 17:59

  Ticket opened.

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  cPanelMichael

  • May 31, 2018 14:26

  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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