Kernel panics or hangs after Spectre/Meltdown updates with "CbSensor"

Solution Verified - Updated -

Issue

  • After patching kernel to address Spectre/Meltdown vulnerability, kernel panics
  • Seeing the following error message when attempting to boot kernel-3.10.0-693.21.1.el7.x86_64 and kernel-2.6.32-696.23.1.el6.x86_64
CbSensor: Netfilter hook has been inserted
<snip>
Mar 21 06:13:10 hostname kernel: [   35.604585] cbsensor: module license 'Proprietary' taints kernel.
Mar 21 06:13:10 hostname kernel: [   35.604589] Disabling lock debugging due to kernel taint
Mar 21 06:13:10 hostname kernel: [   35.605582] CbSensor: CBSENSOR.KO version <version>

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Proprietary cbsensor module

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