Re-enabling CPU’s by writing to /sys/devices/system/cpu/cpuX/online will crash the RHEL 5 system.

Solution Verified - Updated -

Issue

  • If the CPUs are disabled by writing to /sys/devices/system/cpu/cpuX/online, kernel panic may be observed.

  • So far, this has been observed on virtual servers only.

Environment

  • Observed on VMWare guest servers.

  • Possibly, it may be observed on KVM as well.

  • Observed on RHEL 5.11 kernel version 2.6.18-434.el5.

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content