Red Hat Bugzilla – Bug 169962
CPU hotplug code is broken
Last modified: 2015-01-04 17:22:29 EST
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Description of problem:
The current x86_64 CPU hotplug code has a serious bug in it where uninitialized per-cpu data is being used, causing strange values in /proc/stat and /proc/loadavg, and possibly more significant corruption.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
$ cat /proc/loadavg
Actual Results: 1520403.66 -986344.09 666845.94 1/68 23510
Expected Results: Should be small numbers, and never negative.
Disable CONFIG_HOTPLUG_CPU until fixed.
*** Bug 169696 has been marked as a duplicate of this bug. ***
*** Bug 169983 has been marked as a duplicate of this bug. ***
Created attachment 119699 [details]
[PATCH] Fix hotplug cpu on x86_64
*** Bug 170408 has been marked as a duplicate of this bug. ***
Fixed in kernel 2.6.14-rc4
kernel-2.6.13-1.1601_FC5 has the fix.